This part of GB/T 5070 specifies the method for determining the amount of magnesium oxide by the EDTA volumetric method. This part is applicable to the determination of the amount of magnesium oxide in magnesia-chromium refractories. The determination range (mass fraction) is 30.00% to 96.00%. GB/T 5070.9-2002 Chemical analysis methods for magnesia-chromium refractories Part 9: Determination of magnesium oxide by the EDTA volumetric method GB/T5070.9-2002 Standard download decompression password: www.bzxz.net

ICs 81.080
National Standard of the People's Republic of China
GB/T5070.1~5070,12—2002
Generated #B/T57:1.1--5070.11985
Chemical analysis of nagnesia chromium refractory materials
Chemical analysis of nagnesia chronmitc refractorjes2002-12-31Promulgated by the General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
2003.0601Implementation
JCS81.080
National Standard of the People's Republic of China
GB/T 5070.9—2002
Chemical analysis methods of magnesia chromite refractories-Part 9:Determination of magnesium oxideEDTA vulumetric meihod2002-12-31 Issued
Bureau of Quality Inspection and Quarantine of the People's Republic of China
20030601 Implementation
CB/T 5070.9—2C02
Issued in accordance with B/T507 for market supply Chemical analysis methods of magnesia chromite refractories-Part 9:Determination of magnesium oxideEDTA vulumetric meihod2002-12-31 Issued
Bureau of Quality Inspection and Quarantine of the People's Republic of China
20030601 Implementation
CB/T 5070.9—2C02
Issued in accordance with B/T507 for market supply Chemical analysis methods of refractory materials-Part 3 is divided into the following parts: Part 1: Determination of loss on ignition by EDTA vulumetric method! Part 2: Determination of the amount of carbon dioxide by blue photometry: Part 4: Determination of the amount of carbon dioxide by EIA solubility method; Part 1: Determination of the amount of titanium dioxide by antipyrine methane photometry; Part 16: Determination of the amount of calcium carbonate by EA method; Part 17: Determination of the amount of calcium carbonate by FTTA method; Part 18: Determination of the amount of carbon dioxide by pyrolysis; Part 19: Determination of the amount of iodine by absorption spectroscopy; Part 20: Determination of the amount of carbon dioxide by antipyrine methane photometry; Part 21: Determination of the amount of carbon dioxide by antipyrine methane photometry; Part 22: Determination of the amount of titanium dioxide by antipyrine methane photometry; Part 23: Determination of the amount of iodine by antipyrine methane photometry; Part 24: Determination of the amount of iodine by antipyrine methane photometry; Part 25: Determination of the amount of This part is divided into the newly added application or promotion of the black T indicator DTA titration method for the determination of oxidation. This part is divided into Part 1: Standard position guide, Part 4: Standard structure and compilation rules F21.2-2W Standard Rui writing rules, and Part 5: Chemical analysis methods. Appendix to this part Normative appendix
This part is also the responsibility of the Ministry of Industry and Information Technology of China National Normalizing Materials Technology Committee CSSC. This part is also the responsibility of the Ministry of Industry and Information Technology of China National Normalizing Materials Technology Committee Jiyang Qian Refractory Research Institute, Haozheng Steel Co., Ltd.: This part is mainly composed of the following persons: Ministry Qiu Hong, Hui Xianli, Zou Yingming, Cheng Jianping. 1 Scope
Chemical analysis methods for magnesia-chromium refractory materials
Part 9: EDIA volumetric method for the determination of magnesium oxide This part of GBT5070 stipulates: EDTA volumetric method for the determination of magnesium oxide content CB/I 5070.9—2002
This part is used for the determination of the chemical resistance of fire-proof materials before use. The determination acceptance range (quality or fraction) is 3000%-85%. 2 Normative references
The clauses in the following documents become the clauses of this part through reference in this part. All subsequent versions of the documents that are not included in the content reduction of the documents are not applicable to this part. However, it is encouraged to re-submit the documents. No new versions of these documents may be used. For documents without a date, the latest version shall apply. GB/T 5070.1-2000 Refractory Materials Chemical Analysis Methods Part 1: Direct Ignition Reduction Test Method GB/T 81000 Refractory Products Acceptance Rules GB/T 26060 Laboratory ... Case effect flag instrument single mark line discard or bottle G/T128C8 laboratory I glass only single cup practice suction kitchen report G/[? Fire raw material rod is not a shape of fire material to take the bomb 3 principle || tt || test bamboo with sodium carbonate - acid can be combined with the training agent melt dense, dilute the method to take, with ethyl reduction source high price, etc. with hexamethylenetetramine secondary separation soft. Aluminum complex, titanium, etc. Take the more than being, one ethylamine shame ten holding child element, hydrogenation Emperor liquid H = 20! , with Mingsi! Instruction. Pressure E2A standard titration liquid disease 4.1 Flame retardant: Take 2 parts of anhydrous carbon monoxide and 1 part of acid. 4.2 Oxygen ion complex: 0.08/1 and store in a wide bottle. 4.3 Six-base sodium hydroxide solution (300 g/mL). 4.4 Six-base sodium hydroxide solution (106/mL). 4.5 ℃ = 10. Take 5 parts of chlorine and add 1 mL of water. 4.6 Acid: 1-1),
Salt content: 2: 86),
"7. Amine solution (111 ° C,
4.10 Magnesium oxide quasi-solution [cMO, 2ml/
Freshly taken 5.03 pre-burned at 5:100 and cooled in a desiccator at room temperature magnesium oxide 99.99% 55
GB/T 50/0.9—2002
Add a small amount of water to the 2m burnt, add 1m hydrochloric acid (1.g) slowly, add the solution to the solution, cool to the bottom, add 500ml, consult the bottle (4.16), and transfer the solution to the 4.11 EDTA standard titration box [FDTA>=0.025m]/1.]: 4.11.1 Preparation
Weigh 93-tetraacetic acid = sodium (EDA) in the lower burn zone K and dissolve it, cool with water Dilute to 1000, mix wwW.bzxz.Net
4.11.? Calibrate
filter tube (4.1:) Transfer 10.00ml of magnesium-based aliquot (4.1). Divide into 400ml of water, add about 250ml of diethanolamine (1.9), add 15ml of hydrogen peroxide (4.5) and a little chrome black T indicator (4.13) to the HIJTA standard solution (4,11) and titrate until the liquid changes from red to blue. When the volume of the half-production EDTA standard titration solution (wL) exceeds the reported value (1), calculate the average volume V. Otherwise, the new standard is, 4.11.3 Calculate the concentration of the EDTA standard titration solution (volume of the substance EDTA) (liter), the effective value is expressed in ml/I (-) formula, CEDTAS-V,
\ The value of the limit of the magnesium oxide standard titration solution, the unit is mole per liter n1/: the volume of the magnesium oxide standard titration solution (4.1) is expressed in milliliters (1m1). 3
The average value of the EDTA standard titration solution (4.11) consumed by the magnesium oxide standard titration solution is expressed in milliliters (1m1). The calculated result is expressed in approximately four effective digits. 4.12 Congo red test. 4.13 Black T sample, take 1% black T and 50% sodium thiocyanate in a pre-dried state, grind finely, filter and store in a container. 4.14 Pipette: GP: 12x3 A. 1.15 Tube: GB/T12305A 4.6 GT1/T12SA 5.1 Sampling steps (R/10325 GB/T17617) 5.2 Sample preparation B/0.1200-2 6 Analytical steps G, 1. The number of determinations is 2 times. 6.2. Test quantity: 20. Sample rate: D.0UU 3.3. Blank test: In the case of a small blank test under the same conditions, the same sample is analyzed for the same standard substance under the same conditions. 6.5. GB/T 5073.9—2002
Use a multi-fluid tube (.11) to take 100.00mL of the test solution 6.5.7 in Part 7 of the standard. Place it in a 190mL beaker and add about 250㎡l of clothes line, 5 (.9) alcohol amine solution, and then add 5ml of chlorine mixed solution (4.5) and a little black fat small agent 14. 3). Use 1Ting A standard titration solution (4.11> to stabilize until the color of the test wave changes to white, which is the end point. 7 Calculation of analytical results
7.1 The amount of oxidation is expressed as a percentage wMg(). The count value is expressed in %, and the formula (2) is calculated: (V/ox oCa) 0.718?
The amount of calcium consumed by the H1A standard titration solution (1.:1: The volumetric activation value of the titration blank, expressed in milliliter (ML). :The effective value of the volume of the titration blank dissolved in the TTA standard (4.11), expressed in milliliters (mT). :The concentration of the EITA standard solution, expressed in moles per liter (mO1/L). :The amount of the sample, expressed in grams (g/aol). :M-Mg Coulometric value, expressed in grams per liter (g/aol). :7.2: The analysis value is valid under the following conditions: First, the analysis value of the standard substance is consistent with the standard. When the difference between the analysis value of the standard substance and the standard is not greater than the allowable difference, the analysis value of the sample is valid; otherwise, it is invalid. 7.3: When the difference between the two effective analysis values ​​of the sample obtained is not greater than the allowable difference specified in Table 1, the arithmetic mean value shall be taken as the final analysis result; otherwise, additional analysis and data processing shall be carried out according to the provisions of Record A. 7.4 The results obtained shall be in accordance with (3/T8170) peak value. If the commission has a standard requirement for the supply contract, the required number of digits may be changed.
B allowable difference
The difference between the results of two independent tests under the conditions of protein recombinant properties shall be the difference specified in Table 1. Table 1
Vehicle sales (mass fraction)
30, 00 -- 53. ×
50. 01 - H, X
50, 00
Quality Assurance Control
9.1 According to 6.1, the concentration of the standard wave should be recalibrated every two copies. If the temperature changes by 10 degrees within two days, it should be recalibrated in time.
10 The test report should include the following observations:
-Work Name:
Analysis Station Results
CR/T5070.9—2002
Change to GB/T07C.9
Certain steps (if necessary)
Discard the abnormalities observed in the test! If necessary! One test period.
Link,
Continuous scanning,
1-\-, Is,r1,44 algebra
, the difference listed in
Appendix A
(Normative Appendix)
Acceptance analysis value procedure
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CB/T 5370.9—2002
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