Some standard content:
ICS73. 080
Registration No.: 2774-1999
Chemical Industry Standard of the People's Republic of China
HG/T 3588-1999
Barite for chemical industry
Published on April 20, 1999
Implementation on April 1, 2000
Published by the State Administration of Petroleum and Chemical Industry
w.HG/T3588--1999
The technical requirements of this standard and the determination of barium sulfate content are not equivalent to the former Soviet Union national standard IOCT4682-84 (90) "Baryte Concentrate"; the determination of silicon dioxide content (molybdenum blue spectrophotometry) is not equivalent to the international standard IS0638211981 "General method for determination of silicon content - reduced silicate spectrophotometry". The technical differences between this standard and international and foreign standards are as follows: According to the needs of barite for chemical industry in my country, this standard only stipulates three items: sulfate, silica and explosion degree, and according to GB/T12707-91 "Guidelines for Quality Grading of Industrial Products", each item is divided into three grades. While OCT4682:84(90) Class A products stipulate six items and six grades, including barite sulfate and silicon dioxide. Based on OCT4682-84(90) and the product quality and technological development of the world's major barite producing and consuming countries, and combined with my country's resource characteristics, production process and use needs, the indicators of each item in this standard are stipulated; Based on the test and verification, the acid treatment of the sample in the determination of barium sulfate content is different from that of OCT4682-84(90), and sodium carbonate washing solution is used instead of water to wash the converted barium carbonate precipitate. At the same time, a masking agent is added to remove the interference of iron. The determination of silicon nitride content (lead blue spectrophotometry) supplements the method of checking the acidity of the solution with a simpler indicator. In addition, the dosage of some reagents is also different from that of IS06382:1981.
This standard is proposed by the Technical Supervision Department of the Ministry of Chemical Industry of the People's Republic of China. This standard is under the jurisdiction of the Chemical Raw Materials and Minerals Standardization Technical Committee of the Ministry of Chemical Industry. The responsible drafting unit of this standard is Lianyungang Design and Research Institute of the Ministry of Chemical Industry. The drafting units of this standard include: Hebei Xinji Barium Group Co., Ltd., Hunan Hengyang Barite Mine, etc. The main drafters of this standard include: Wang Heping, Wang Fanfan, Gong Gaobin. This standard is recommended to be published for the first time.
This standard is entrusted to Lianyungang Design and Research Institute of the Ministry of Chemical Industry for interpretation. .Scope
Chemical Industry Standard of the People's Republic of China
Barite for chemical industry
Barit for chemical industry
HG/T3588—1999
This standard specifies the requirements, sampling and sample preparation, test methods, inspection rules, marking, packaging, transportation, storage, etc. of barite for chemical industry.
This standard is recommended to be applicable to barite used in the production of chemical products such as barium salts and lithopone. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard was published, the versions shown were valid. All standards will be revised. Parties using this standard should explore the possibility of using the latest versions of the following standards: GB/T1250-89 Methods for expressing and determining limit values GB/T 6003-85 GB/T 6678-86 General principles for sampling of chemical products GB/T 6682-92 Specifications and test methods for water used in analytical laboratories (eqvISO3692:1987) General rules for chemical reagents and molecular absorption spectrophotometry (ultraviolet and visible light part) GB/T 9721-88 3 Requirements Barite products for chemical use should meet the requirements of Table 1. Table 1 requires Barium sulfate (BaS()) content, % Silicon dioxide (SiO2) content, % Explosion resistance, % Explosion resistance, % Explosion resistance, % Explosion resistance, % The content of each component is calculated on a basis of
Superior products
2Silicon dioxide and explosion index of qualified products shall be implemented according to the supply and demand contract, 4 Sampling and sample preparation
4.1 Sampling
4.1.1 Sampling quantity
Qualified products
Ore products of the same grade and sent to the same user at the same time are considered as a batch. The total sampling amount shall not be less than 0.03% of the batch, and the amount of the sample shall not be less than 0.5kg.
The number of samples for carriage sampling is determined, with one carriage as a sampling unit, and the minimum number of sampling units selected from the total number of carriages of each batch of ore Approved by the State Administration of Petroleum and Chemical Industry on April 20, 1999, and implemented on April 1, 2000
.bzsoso:comHG/T 3588--1999
According to the provisions of 6.6.1 in GB/T6678-86. When the total number of carriages is less than 10, the samples shall be collected one by one. When the total number of carriages is greater than 10, the samples shall be determined according to the provisions of Table 2 in GB/T6678-86.
When the particle size of commercial lump ore is greater than 200 Ⅱm, the sampling points, total sampling amount and incremental sample quantity can be appropriately increased. 4.12 Operation method
Use the sampling tool to take incremental samples at a depth of more than 0.1m from the bottom and less than 0.2m from the surface. The incremental sample plates taken from the same batch should be similar.
When taking incremental samples, attention must be paid to the particle size and the proportion of different colors of the ore, and no random selection is allowed. If the sampling point falls on a lump ore with too large particle size, it needs to be crushed with a hammer to take a sample representing the lump ore. 4.1.2.1 Ore pile sampling
On the entire surface of the ore pile, draw several horizontal lines from about 0.3m from the bottom to the top every 1m, and arrange sampling points about 1.5m apart on each line. The amount of each sample and the total amount of sampling shall comply with the provisions of 4.1.1. 4. Next. 2.2 Sampling on Vehicles and Ships
When transporting by car, train or ship, the sampling shall be arranged at 5 points according to Figure 1 on the car, 11 points according to Figure 2 on the train, and more points according to Figure 2 on the ship according to the cut weight. The amount of each sample and the total amount of sampling shall comply with the provisions of 4.1.1.
Figure 1 Schematic diagram of sampling points for automobiles
4.2 Sample preparation
Figure 2 Schematic diagram of sampling points for trains
4.2.1 Combine the samples taken from the same batch, crush, screen, mix and reduce. The processing process can be mixed by cone method or other methods, reduced by reducer or quartering method, and crushed and reduced step by step according to formula (1): Q=Kd
Where: Q—minimum reliable mass of the reduced sample, kg; d.-—maximum particle size of the reduced sample, mm
K——reduction coefficient, take 0.1.
4.2.2 Prepare the samples according to 4.2.1 until all of them pass through the 425mm standard sieve, mix thoroughly, reduce 250g, and divide them into two clean, dry ground-mouth bottles (or plastic sample bags) in equal amounts. After sealing, affix a label (or put the label in the bag), indicating the production unit, product name, batch number, sample quantity, sampling date, location and name of the sampler. One bottle (bag) is sent to the laboratory as a laboratory sample: the other bottle (bag) is used as a sample for examination, and the sample for examination is kept for three months. 4.2.3 After receiving the laboratory sample, the laboratory takes out about 50g, grinds it until it passes through the 90μm standard sieve, mixes it thoroughly, and puts it in a clean and dry ground-mouth bottle (or paper sample bag) for the determination of the project. Note: If the sample is too large to prevent grinding and sieving, it can be properly dried below 110℃. 5 Test method
The water used in this standard should meet the specifications of grade 3 water in GB/T6682, and the water used in 5.2 should meet the specifications of grade 2 water. The listed reagents, unless otherwise specified, refer to analytical pure reagents. 5.1 Determination of barium sulfate content
5.1.1 Summary of the method
HG/T 3588—1999
In a hydrochloric acid medium, use hydroxylamine hydrochloride to mask the iron and aluminum ions, add sulfuric acid to generate barium sulfate precipitation. Filter, burn and weigh. 5.1.2 Reagents and solutions
5.1.2.1 Anhydrous potassium sodium carbonate, which can also be prepared by grinding and mixing potassium carbonate and sodium carbonate in equal parts 5.1.2.2 Sodium carbonate wash solution: 10g/L,
5. 1.2.3 Hydrochloric acid (p, 1.19 g/mL) solvent, 1+1; 5.1.2.4 Hydrochloric acid solution: 1+9
5.1.2.5 Sulfuric acid (p: 1.84 g/mL) solvent: 1+9; 5.1.2.6 Hydroxylamine hydrochloride solvent: 50g/L, 5.1.2.7 Silver nitrate solution: 10g/L.
5.1.3 Sample
The sample was dried at 105-110℃ for more than 2h, and then cooled to room temperature in a desiccator. 5.1.4 Analysis steps
5.1.4.1 Treatment with dilute hydrochloric acid
Weigh about 0.5g of sample (accurate to 0.0002g), place in a 250ml beaker, add 50mL of hydrochloric acid solution (5.1.2.4), cover with surface blood, place in a boiling water bath, and heat for 30min. Remove, rinse the surface blood and the cup wall with a little heavy water, and let it cool slightly. Filter with slow filter paper, rinse the beaker and precipitate with warm water 5~6 times. Put the precipitate and filter paper into a platinum, dry and ash, place in a high-temperature furnace and burn at about 700℃ for 20~30min. Take it out and cool.
Note: According to the negotiation between the supply and demand parties, the sample can be directly converted according to 5:1.4.2 without dilute hydrochloric acid treatment, and the total lock content measured is expressed as sulfur melt (BaSD,). 5.1.4.2 Conversion
The precipitate after burning is mixed with 5-6 parts of anhydrous potassium carbonate sodium (5.1.2.1), and then covered with 1 part of anhydrous potassium carbonate sodium, placed in a high-temperature furnace, and melted at 900C for more than 40 minutes. Take it out and cool it. Place it in a 250mL beaker, add 70-80mL of hot water, heat it at a low temperature, so that the frit completely falls off and becomes fine powder, rinse it with hot water and wipe it carefully with a connecting rod. Heat it to a slight boil, let it stand and cool slightly. Filter it with slow filter paper, rinse the beaker with warm sodium carbonate washing solution (5.1.2.2) 4-5 times, and then wash the precipitate 8-10 times. 5.1.4.3 Precipitation
Cover the funnel with surface blood, use a dropper to add 10mL of hydrochloric acid solution (5.1.2.3) to the funnel several times to dissolve the precipitate, collect the filtrate in a 400ml beaker, rinse with hot water after each addition of hydrochloric acid, after all the hydrochloric acid has been added, rinse the surface dish with hot water and wash the filter paper more than 10 times until there is no chloride ion in the filtrate. Test with silver nitrate solution (5.1.2.7). Add 5mL of hydroxylamine hydrochloride solution (5.1.2.6) to the filtrate and stir. Add water to the filtrate volume of 250mL and heat to boil (the yellow color of the solution disappears). Remove and add 10mL of sulfuric acid solution (5.1.2.5) dropwise at a uniform speed while stirring, and boil slightly for about 2min. Cover the surface blood and keep at 60~70℃ for more than 2h, or let it stand at room temperature overnight. 5.1.4.4 Filtration, calcination, and weighing
Filter with slow filter paper, then wash the precipitate with warm water until the filtrate is free of chloride ions. Test with silver nitrate solution. Place the precipitate and filter paper in a porcelain pot or platinum incubator that has been calcined to a constant weight, dry and ashed completely, then place in a high-temperature furnace and calcine at 800-850℃ to a constant weight (more than 40 minutes). Take it out, cool it slightly, place it in a lower desiccator, cool it to room temperature, and weigh it. 5.1.5 Expression of analysis results
The barium sulfate (BaSO4) content (X4) expressed as a mass percentage is calculated according to formula (2): X: = ml = m2×100
The mass of the barium sulfate precipitate and the crucible, m.
The mass of the incubator·g
The mass of the sample, g.
5.1.6 Allowable difference
The arithmetic mean of the parallel analysis results is taken as the final analysis result. The absolute difference of the parallel analysis results of barium sulfate should not exceed 0.60%.
HG/T 3588—1999
5.2 Determination of silicon dioxide content Molybdenum blue spectrophotometry (arbitration method) 5.2.1 Method summary
The sample is alkali fused, water leached and then acidified. Under pH 1.1, sodium molybdate and silicic acid form molybdate silicate, which is reduced to a blue complex in a salicylic acid-sulfuric acid medium with ascorbic acid, and the absorbance is measured at 660~～700nm on a spectrophotometer. 5.2.2 Reagents and solutions
5.2.2.1 Mixed flux: Weigh equal amounts of anhydrous sodium carbonate, potassium carbonate and sodium tetraborate (obtained by burning sodium tetraphosphate decahydrate at 400°C): grind in a mortar and mix well.
5.2.2.2 Sodium hydroxide
5.2.2.3 Sodium peroxide.
5. 2. 2. 4
Sodium hydroxide solution, 100 g/. Store in a plastic bottle. Hydrochloric acid (p: 1.19 g/mL) solution: 1+1.
5.2.2.6 Hydrochloric acid solution: 1+3.
Hydrochloric acid solution: 1+9.
5.2.2.8 Oxalic acid-sulfuric acid mixed solution: prepare oxalic acid solution (50g/L) and sulfuric acid (α: 1.84g/mL) solution (1+3) respectively, and then mix them in equal volumes.
5.2.2.9 Sodium molybdate solution: 140/L.
Weigh 70g of sodium molybdate (Na2Mo04.2H0), add 500ml of warm water to dissolve, cool to room temperature, transfer to a plastic bottle, and filter if necessary.
5.2.2. 10 Ascorbic acid solution: 10 more/L. Prepare before use. 5.2.2.11 Potassium permanganate solution: 2g/.
5.2.2.12 Silicon monofluoride standard solution: 200μg/mL. Weigh 0.1000g of silicon dioxide (high purity reagent) that has been pre-calcined at 1000℃ for 30 min and cooled to room temperature in a desiccator, and place it in a platinum crucible. Add 2g of anhydrous sodium carbonate and mix, then cover with 1.g of anhydrous sodium carbonate, melt at 1000℃ in a high-temperature furnace for 30min, take it out, and cool it. Place it in a polytetrafluoroethylene beaker containing 100mL of hot water, heat and leach the frit until the solution is clear. Wash out the crucible and cover with hot water, cool to room temperature, transfer to a 500mL volumetric flask, dilute with water to the mark, and shake. Immediately transfer the solution to a plastic bottle, 5.2.2.13 Silica standard solution: 20μg/ml. Take 25.0mL of silica standard solution (5.2.2.12) and place it in a 250TL volumetric flask - dilute with water to the mark, and shake. This solution contains 20 μg silicon dioxide per milliliter (prepared before use). 5.2.2. 14 p-Nitrophenol ethanol solution indicator solution: 5 g/L. 5.2.3 Instrument
Spectrophotometer: It should comply with the provisions of GB/T9721. 5.2.4 Test sample
The test sample shall be dried at 105~110℃ for more than 2h, placed in a desiccator and cooled to room temperature. 5.2.5 Analysis steps
5.2.5.1 Preparation of test solution
Choose one of the following two methods.
Table 2 Sample weight
Silicon dioxide content, %
Sample weight, g
a Mixed flux melt sample
HG/T 3588—1999
Weigh the sample according to Table 2 (accurate to 0.0002g) and place it in a platinum crucible. Add 2~3g of mixed flux (5.2.2.1), mix, and then cover with 1g of mixed flux (prepare blank test solution at the same time). Cover the lid with a gap, place in a high-temperature furnace, and melt at 700~800℃ for 15~20min. Take out and cool, place in a 250ml beaker, add 50ml hydrochloric acid solution (5.2.2.6), immediately cover with blood, heat slightly at low temperature to make the melt fall off completely, and wash the pot with hot water. After the solution cools, transfer it to a 250ml volumetric flask, dilute with water to the scale, and shake well. Dry filter with slow filter paper (discard the initial filtrate). h Sodium hydroxide melt sample
According to Table 2, weigh the sample (accurate to 0.0002g) and place it in a silver pot, add 3g sodium hydroxide (5.2.2.2), a little sodium peroxide (5.2.2.3) (prepare blank test solution at the same time), cover with blue and leave a gap, place in a high-temperature furnace, slowly heat from low temperature to 700℃, and melt for about 20min. Take out and cool, place in a 250mL polytetrafluoroethylene beaker, add 50~60mL boiling water, immediately cover with a watch glass, heat at low temperature to make the frit completely fall off, and wash the crucible with hot water and a small amount of hydrochloric acid solution (5.2.2.7). Transfer to a 250mL volumetric flask through a short-necked slide, quickly add 25mL hydrochloric acid solution (5.2.2.5), shake well, cool, dilute to the scale with water, and shake well. Filter with slow filter paper (discard the initial filtrate). 5.2.5.2 Adjust the acidity of the solution
Choose one of the following two methods.
a Check the acidity with a pH meter
Pull 5.0mL of the filtrate into a 100mL volumetric flask and dilute with water to about 30mL. Add about 4mL of hydrochloric acid solution (5.2.2.6) and shake the spoon. Note: The exact amount of this hydrochloric acid solution added is determined by checking with a pH meter during the color development step. b Check the acidity with an indicator
Pull 5.0 mL of the filtrate into a 100 mL volumetric flask and dilute with water to about 30 mL. Add a drop of p-nitrophenol ethanol solution indicator (5.2.2.14), add sodium hydroxide solution (5.2.2.4) to turn the liquid yellow, and then add hydrochloric acid solution (5.2.2.7) to turn the solution from yellow to colorless (do not let the acid or alkali solution get on the bottleneck when adjusting the acidity). Add 4.0 mL of hydrochloric acid solution (5.2.2.6) and shake the hook. 5.2.5.3 Color development
Add a drop of potassium permanganate solution (5.2.2.11), shake the hook to make the solution light red (the test solution prepared by the platinum pot does not need to add potassium permanganate solution). Add 10 mL of sodium molybdate solution (5.2.2.9), shake well, and let it stand for 10 minutes. At this time, the pH of the solution should be 1.1±0.2. Note: Use a pH meter to check the acidity, which should be done in advance in this step. Use an indicator to check the acidity. At this time, the pH of the solution is exactly 1.1±0.2. Add 20 mL of oxalic acid-sulfuric acid mixed solution (5.2.2.8), shake well, and let it stand for 5 minutes. Add 5 mL of ascorbic acid solution (5.2.2.10). Dilute with water to the scale and shake the hook.
5.2.5.4 Measurement
After 10 to 20 minutes, use an absorption cell with a 2 cm optical path and measure the absorbance at 660~~700nm of the spectrophotometer with the blank test solution as the reference solution.
5.2.5.5T Plotting the working curve
Use a microburette to measure 0.0, 1.0.2.5, 5.0.7.5, 10.0mL of silica standard solution (5.2.2.13) equivalent to 0, 20, 50, 100, 150, 200μgSiOz), respectively, and place them in a group of 100mL volumetric flasks, and dilute with water to about 30mL. The following analysis steps are carried out according to 5.2.5.2 to 5.2.5.4. Take the reagent blank as the reference solution and measure the absorbance. Use the amount of silica as the horizontal axis and the corresponding absorbance as the vertical axis to plot the working curve.
5.2.6 Expression of analysis results
The silicon dioxide (SiO2) content (Xg) expressed as mass percentage is calculated according to formula (3): (=m×5/250×100=m×5×10-1
Xg=mi×10-6
-the amount of silicon dioxide found on the working curve, rg; where: m:-www.bzxz.net
m - the mass of the sample, g.
5.2.7 Allowable error
The arithmetic mean of the parallel analysis results is taken as the final analysis result. The absolute difference of the parallel analysis results of silicon dioxide shall not be greater than the allowable error listed in Table 3.
Silicon dioxide (Sit) content
0.10--1.00
>1. 00~3. 00
>3. 00~5. 00
>5.00~10.00
HG/T3588-1999
Table 3 Tolerance
Direct treatment with hydrofluoric acid
5.3 Determination of silicon dioxide content
5.3.1 Method summary
Tolerance
Add sulfuric acid to the sample to make other salts generate stable sulfur salts, add hydrofluoric acid to make silicon dioxide generate silicon tetrafluoride and other volatilization and escape, and calculate the silicon dioxide content based on the lost mass. 5.3.2 Reagents and solutions
5.3.2.1 Sulfuric acid (p; 1.84 g/mL);
5.3.2.2 Hydrofluoric acid (e: 1.13 g/mL). 5.3.3 Sample
Dry the sample at 105-110℃ for more than 2h, place it in a desiccator and cool it to room temperature. 5.3.4 Analysis steps
5.3.4.1 Sulfuric acid treatment
Weigh about 1g of sample (accurate to 0.001g), place it in a platinum crucible, add a little water to moisten the sample, add 0.5mL of sulfuric acid, evaporate to dryness at low temperature, and increase the temperature until all the white smoke of sulfur trioxide is gone. Place it in a high-temperature furnace and burn it at 850℃ to constant weight (more than 1h). Take it out, cool it slightly, place it in a desiccator, cool it to room temperature, and weigh it.
5.3.4.2 Hydrofluoric acid treatment
Add a little water to the crucible to moisten it, add 4-5 drops of sulfuric acid, add 5mL of hydrofluoric acid, and evaporate to dryness. Increase the temperature until all the white smoke of sulfur dioxide is gone. Place it in a high-temperature furnace and burn it at 850℃ to constant weight (more than 1h). Take out, shimmer, place in a desiccator, cool to room temperature, and weigh. 5.3.5 Expression of analysis results
The silicon dioxide (SiO2) content (X:) expressed as mass percentage is calculated according to formula (4): m1--m2×100
Where: m1
The mass of the residue and the mass before hydrofluoric acid treatment, m. The mass of the residue and the mass after hydrofluoric acid treatment.g The mass of the sample g.
5.3.6 Allowable difference
Take the arithmetic mean of the parallel analysis results as the final analysis result. The absolute difference of the parallel analysis results of silicon dioxide should not be greater than the allowable difference listed in Table 1.
Table 4 Allowable difference
. Silicon oxide (Si)2) content
1. 00~ 3. 00
>3. 00~5: 00
5.4 Determination of bursting degree
5.4.1 Summary of method
Allow steaming
comHG/T3588—1999
Samples of a certain particle size are burst by high temperature burning, sieved and weighed, and the bursting degree can be calculated. 5.4.2 Instruments and equipment
General laboratory instruments and equipment and
5.4.2.120mm and 30mm test sieves, prepared with reference to GB/T6003, round mesh, 5.4.2.22mm test sieve, in accordance with the provisions of GB/T6003; 5.4.2.34mm test sieve, in accordance with the provisions of GB/T6003. 5.4.3 Determination steps
5.4.3.1. Determination of samples with a particle size greater than 20 mm Use a small hammer to break the large sample into small pieces with a diameter of 20~~30mm (can be visually observed or sieved with the self-made sieve in 5.4.2.1), dry at 105~110℃ and cool to room temperature. Weigh about 200g of the sample (accurate to 0.1g), place it in a 300mL porcelain crucible, cover it, and place it in a 400℃ high-temperature furnace. When the temperature rises to 600℃, burn it for 30min, take it out, cool it slightly, and place it in a desiccator to cool it to room temperature. Pour it into a 2mm sieve (5.4.2.2) and sieve it, and weigh the sieved material. 5.4.3.2 Determination of granular samples with a particle size less than 20mm The sample is sieved with a 4 mm sieve (5.4.2.3), and the sieved residue is dried at 105-110℃ and cooled to room temperature. Weigh about 200g of the sample (accurate to 0.1g), place it in a 300mL porcelain crucible, cover it, and place it in a 400℃ high-temperature furnace. When the temperature rises to 600℃, burn it for 30min. Take it out, cool it slightly, and place it in a desiccator to cool it to room temperature. Pour into a 2mm sieve (5.4.2.2) and sieve, and weigh the sieved material.
5.4.4 Expression of the test results
The bursting degree (X,) expressed as a mass percentage is calculated according to formula (5): X,=mo×100
Where: m. ——The mass of the sieved material; m-the mass of the sample.
6 Inspection rules
6.1 All items specified in this standard are type inspection items. Among them, sulfuric acid and silicon dioxide are factory inspection items and should be inspected batch by batch. Under normal production conditions, type inspection is carried out once a quarter. 6.2 Chemical barite products should be inspected by the quality inspection department of the production unit, and the production unit should ensure that the supplied products meet the requirements of this standard.
6.3 The user has the right to inspect the received chemical barite in accordance with the provisions of this standard. If there is any objection, it should be raised within 15 days after the arrival of the goods and resolved through negotiation.
6.4 This standard adopts the "rounded value comparison method" specified in GB/T1250 to determine whether the test results meet the requirements of this standard. If the test results are unqualified, samples should be taken from twice the number of samples for re-testing. 6.5 When the supply and demand parties have objections to product quality and need arbitration, they should follow the relevant provisions of the "Product Quality Law of the People's Republic of China". 7 Marking, packaging, transportation, storage
7. 1 Each batch of barite products shall be accompanied by a quality certificate, which shall include the name of the production unit, product name, product grade, quality index, product net weight, batch number, delivery date and the number of this standard. 7.2 Barite products shall be transported in bulk by train, car, ship, etc. 7.3 Ore from different delivery batches shall be stacked separately. w.bzsso.com (Beijing) Xindengzi No. 039
People's Republic of China
Chemical Industry Standard
Chemical Industry Straight Spar
HG/T 3588—1999
Published and distributed by Chemical Industry Press
(No. 3 Huixinli, Chaoyang District, Beijing: Postal Code 100029) http://cip.com.cn
Distributed by Beijing Publishing House of Xinhua Bookstore
Printed by Chemical Industry Press
Printed and bound by Chemical Industry Press
Format 880×1230 mm1/16 sheet%Number of words 14,000 wordsFirst edition in January 2000First printing in Beijing in January 2000Book number: 155025-0008
Price: 8.00 yuan
All rights reserved. Copyright reserved.
If there are any missing pages, reversed pages or pages out of the book, the Publishing Department of this Publishing House will be responsible for the return and replacement6661880
Tip: This standard content only shows part of the intercepted content of the complete standard. If you need the complete standard, please go to the top to download the complete standard document for free.