Some standard content:
This standard is proposed by the Department of Market and Economic Information of the Ministry of Agriculture. This standard is under the jurisdiction of the Township Enterprise Bureau of the Ministry of Agriculture. This standard is drafted by the Quality Supervision, Inspection and Testing Center of Fireworks and Firecrackers of the Ministry of Agriculture. The main drafters of this standard are: Liu Chunwen, Kuang Xuejian, Peng Yanping, Yang Jun, Qiu Yongming. NY/T756—2003
1 Scope
Titanium powder
NY/T 756—2003
This standard specifies the quality requirements, test methods and packaging, transportation and storage requirements of metal titanium powder, sponge titanium powder and hydride titanium powder used in fireworks products.
This standard applies to metal titanium powder, sponge titanium powder and hydride titanium powder used in fireworks. 2 Normative references
The clauses in the following documents become the clauses of this standard through reference in this standard. For any dated referenced document, all subsequent amendments (excluding errata) or revisions are not applicable to this standard. However, parties reaching an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. For any undated referenced document, the latest version shall apply to this standard. GB/T3049—1986 General method for determination of iron content in chemical products O-phenanthroline spectrophotometry GB/T6678 General rules for sampling of chemical products
3 Product classification and quality indicators
3.1 Product classification
Metal titanium powder, sponge titanium powder, hydride titanium powder. 3.2 Quality indicators
3.2.1 Appearance requirements
3.2.1.1 Appearance requirements for metal titanium powder: small flakes, silver gray. 3.2.1.2 Appearance requirements for sponge titanium powder: light gray, spherical. 3.2.1.3 Appearance requirements for hydride titanium powder: dark gray, spherical. 3.2.2 Particle size requirements
Particle size requirements are shown in Table 1.
Upper sieve mesh aperture/mm
3.2.3 Other indicators
See Table 2.
Particle size distribution
Lower sieve mesh aperture/mm
Upper sieve residue S+/(%)
Lower sieve output S/(%)
NY/T 756--2003
Product category
Sponge titanium powder
Metal titanium powder
Titanium hydride powder
Test method
4.1 Appearance
Visual inspection.
4.2 Determination of titanium powder particle size
4.2.1 Summary of the method
Titanium content/(%)
Hydrochloric acid insoluble matter/(%)
Iron content/(%)
The sample is placed on a standard sieve with a diameter of 200 mm and a height of 50 mm, and sieved with a vibrating sieve machine. After vibrating for several minutes, the mass of titanium powder on the upper sieve and the mass of titanium powder under the lower sieve are weighed respectively to determine the titanium powder particle size. 4.2.2 Tools and instruments
4.2.2.1 Stopwatch and brush.
4.2.2.2 Standard sieve.
4.2.2.3 One pan balance.
4.2.2.4 One vibrating sieve machine.
4.2.3 Determination steps
4.2.3.1 Select a standard sieve group according to the brand. 4.2.3.2 Stir the sample evenly, weigh 50.00g of the sample and place it on the upper sieve, cover it with the pressure cover, fasten it to the vibrating sieve machine, and vibrate for several minutes until no powder can be sieved out.
4.2.3.3 Remove the sieve group and weigh the mass.
4.2.4 Calculation of sieving results
Calculate the mass fraction of titanium powder on the upper sieve according to formula (1): S.=
Where:
Mass fraction of titanium powder on the upper sieve.%;
Mass of titanium powder on the sieve, in grams (g);
Mass of sample, in grams (g).
×100%
Calculate the mass fraction of titanium powder under the sieve according to formula (2): Where:
S.-mass fraction of titanium powder under the sieve, %; m2---mass of titanium powder under the sieve, in grams (g); m--mass of sample, in grams (g). 4.3 Determination of titanium content
4.3.1 Principle
s.= m2× 100%
NY/T 756--2003
In an acidic solution, titanium (IV) is reduced to titanium (II) with metallic aluminum, and then titrated with thiocyanate as an indicator and ferric ammonium sulfate standard solution to reoxidize titanium (III) to titanium (IV), until the solution turns red. Ti4+ +Al ---→Tj3+ -+A13+
Ti3+ +Fe3+→Ti4+ +Fe2+
Fe3+(excess)+CNS-1→Fe(SCN);(red)4.3.2 Reagents
4.3.2.1 Hydrofluoric acid.
4.3.2.2 Hydrochloric acid.
4.3.2.3 Sodium bicarbonate: saturated solution.
4.3.2.4 Ammonium thiocyanate solution: 10%.
4.3.2.5 Tin dichloride: 10%.
Sodium diphenylamine sulfonate: 0.1%.
Potassium dichromate: 0.1mol/L.
Saturated ammonium sulfate solution: Weigh 71g of ammonium sulfate and dissolve it in 100ml of water, filter before use. 4.3.2.8Www.bzxZ.net
4.3.2.9 Benzene.
4.3.2.10 Ammonium ferric sulfate standard solution
Preparation: Weigh 55g FeNH(S)212H2 in 800ml water and 15ml concentrated sulfuric acid, heat to dissolve, cool, add 0.1mol/L potassium permanganate solution dropwise until it turns very light red to oxidize the possible iron (II), then dilute to 1L. Each milliliter of this solution is equivalent to about 5mg titanium oxide.
Calibration: With potassium dichromate as the reference substance, transfer 25.00mL of ammonium ferric sulfate standard solution and 250ml. conical flask, add 10mL of hydrochloric acid, heat to near boiling, while hot, add 10% tin dichloride solution until the yellow color of iron () disappears, 1-2 drops in excess, cool to room temperature, add 10mL of saturated mercuric dichloride solution, let stand for 2-3min, add 15mL of sulfuric acid and phosphoric acid mixture (150mL sulfuric acid and 150mL phosphoric acid added to 50mL water), add water to about 80ml., add 2 drops of sodium diphenylamine sulfonate (0.1%), and titrate with 0.1moi/L potassium dichromate standard solution until a stable purple-red color is shown as the end point. The titration degree of ammonium ferric sulfate standard solution on titanium is calculated according to formula (3): T = × 0. 047 88
T-the titration degree of ammonium ferric sulfate standard solution on titanium, in grams per milliliter (g/mIL); c-the concentration of potassium dichromate standard solution, in moles per liter (mol/L); V---the number of milliliters of potassium dichromate standard solution consumed in titration, in milliliters (mL); V, the number of milliliters of ammonium ferric sulfate standard solution transferred, in milliliters (mL). 4.3.3 Determination steps
(3)
Weigh about 0.2g of the sample (accurate to 0.0001g) into a 300ml polyethylene beaker, add 10ml of water and 4ml of hydrofluoric acid, react vigorously and continue heating until dissolved. After cooling, add 60ml of hydrochloric acid (1+1), add 15ml of saturated ammonium sulfate solution, add water to about 150ml, add 2g of lead sheet, seal the bottle mouth with a protective stopper, add 10ml of saturated sodium bicarbonate solution to the funnel, and continue boiling for 3min to 4min until the aluminum sheet is completely dissolved. Remove the generated hydrogen, cool to room temperature with running water, immediately add 10ml of benzene, titrate with ammonium ferric sulfate standard solution until it turns light purple, add 2ml of ammonium thiocyanate indicator, and continue titrating until the solution turns slightly red. Calculate the titanium content according to formula (4):
Cn(%) YXT×100
Wherein:
Cri——Titanium content, %;
V---The number of milliliters of ammonium ferric sulfate standard solution consumed during titration, in milliliters (mL); T---The titer of ammonium ferric sulfate standard solution on titanium, in grams per milliliter (g/mL); m--Sample mass, in grams (g).
4.3.4 Allowable error
The allowable error is ±1%.
4.4 Determination of hydrochloric acid insoluble matter
4.4.1 Reagents
Hydrochloric acid.
4.4.2 Determination steps
Weigh about 2g of the sample (accurate to 0.0001 more) in a 500mL beaker, add 20mL hydrochloric acid (1+1), 10mL concentrated hydrochloric acid, heat and boil for 20min to dissolve, cool, filter with a constant amount of filter paper, dry to constant weight, and weigh. Calculate the content of hydrochloric acid insoluble matter according to formula (5): mz = ml × 100
Y(%) \
Where:
Y—-the content of hydrochloric acid insoluble matter, %;
m2———the mass of the hydrochloric acid insoluble matter and filter paper that has been dried to a constant weight, in grams (g); the mass of the filter paper that has been dried to a constant weight, in grams (g); mi
the mass of the sample, in grams (g).
4.5 Determination of iron content
According to GB/T3049-1986.
5 Acceptance rules
(5)
5.1 Titanium powder shall be inspected by the quality supervision and inspection department of the manufacturer in accordance with the provisions of this standard. The manufacturer shall ensure that all products leaving the factory meet the requirements of this standard.
Each product leaving the factory shall be accompanied by a quality certificate, which shall include: manufacturer name, factory address, product name, brand, grade, net weight, batch number, production date, quality certificate that the product quality meets this standard and the number of this standard. 5.2 The user has the right to accept the titanium powder received within one month in accordance with the provisions of this standard. 5.3 Sampling shall be carried out in accordance with GB/T6678, and samples shall be randomly selected by stratification. After mixing the samples, they shall be divided into quarters to not less than 500g, and the samples shall be divided into two clean and dry plastic bags and sealed. Labels shall be attached, indicating the manufacturer name, product name, grade, brand, batch number and production date, sampling date and name of the sampler. One copy shall be used for inspection and the other shall be kept for three months for future reference. 5.4 If one of the indicators in the test results does not meet the requirements of this standard, samples should be taken from the packaging units of twice the quantity for re-testing. If one of the indicators in the test results does not meet the requirements of this standard, the entire batch of products cannot be accepted. 5.5 When the supply and demand parties have objections to the product quality, they shall be handled in accordance with the provisions of the "Product Quality Law of the People's Republic of China". 4
Packaging, transportation, compensation and storage
NY/T756--2003
6.1 The packaging container of titanium powder should clearly indicate: manufacturer name, address, product name, brand, grade, net weight, batch number or production date, implementation standard number, and moisture-proof, waterproof, and dangerous goods labels. 6.2 Titanium powder is double-layered, and the inner packaging is polyethylene plastic film bag or two-layer kraft paper bag, or divided into multiple small bags. The outer packaging is carton, wooden box or metal packaging, and the net weight of each piece shall not exceed 50kg. 6.3 Titanium powder should be covered during transportation to prevent rain. 6.4 Titanium powder should be stored in a cool and dry place, separated from oxidants. 6.5 The effective shelf life is two years. If it exceeds the shelf life, it can only be used after passing the inspection.
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.