Some standard content:
Chemical Industry Standard of the People's Republic of China
Platinum catalyst for S201 nitric acid production
Subject content and scope of application
HG2271.1-92
This standard specifies the technical requirements, test methods, inspection rules and marking, packaging, transportation and storage of platinum catalyst for S201 nitric acid production.
This standard applies to platinum catalyst (platinum mesh) for S201 nitric acid production and platinum mesh of special specifications required by users. 2 Reference standards
GB1250 Method of expressing and determining limit values HG/T2271.2 Test method for platinum catalyst for S201 nitric acid production 3 Technical requirements
3.1 The appearance is silver-white mesh. The mesh surface is flat, clean, and the self-test mesh has no burrs. There is no joint in the weft wire, and the warp wire joints are connected in a twisted manner
, and the wires are evenly laid. The mesh seam width is 10±2mm, and the edge width is 10±2mm. No cracks or breaks. 3.2 The mesh diameter specifications are: 1500, 2060, 2440, 2570, 2875, 3050, 3345, 3760mm and the mesh diameter specifications required by the user.
3.3 The content of main elements is shown in Table 1.
92.1~92.9
The content of trace impurity elements is shown in Table 2
Ni+Cu+Cr
Note: The total amount of impurities refers to the sum of the contents of Fe, Ni, Cr, Pb, Cu, Sn, Zn, Bi, Ca, Mg and Al. 3.5 Physical parameters are shown in Table 3.
0.0900.802
Wire tensile strength
≥343
Wire elongation
Number of mesh holes
Hole/cm2
1024-65
3.6 The classification of platinum mesh according to the number of breaks, joints and mesh defect area is shown in Table 4. Approved by the Ministry of Chemical Industry of the People's Republic of China on March 3, 1992% (m/m)
10-6(m/m)
Total amount of impurities
Net diameter tolerancebzxZ.net
Net quality
804~956
Implemented on January 1, 1993
Number of breaks and joints, pieces
HG2271.1-92
Net defect area (lying weft, loose silk,
dense path), cm2
Number of breaks and joints, pieces
Net defect area (lying weft, loose silk,
sparse and dense path), cm2
Note: The net with the net diameter specification required by the user shall refer to the above specifications. The number of breaks, joints and net defect area indicators shall be determined after conversion according to the net with similar specifications. The mesh angles and mesh wires required by the user are inspected at the same time as the finished mesh. 4 Test methods
The determination of the content of main elements and trace impurity elements, physical parameters, number of breaks, joints and mesh defect area of the platinum mesh is carried out in accordance with HG/T2271.2.
5 Inspection rules
5.1 This product is inspected by the quality supervision and inspection department of the manufacturer. The manufacturer shall ensure that the products shipped meet the requirements of this standard. Each platinum mesh shall be accompanied by a quality certificate, indicating the manufacturer name, product name, product specifications and model, product number, product grade, mesh quality, production date, factory expiration date and this standard number. According to user requirements, the middle seam of the finished mesh can be welded. 5.2 The inspection of the chemical composition of the platinum mesh is based on monthly products as a batch, in which 20cm of each tube of finished wire is sampled, and the total sampling volume is not less than 25g, and placed in a dry organic glass box for inspection and retention. The sample retention period is 1 year. The inspection of the diameter of the finished silk is carried out three times a month. Each time, 1/3 of the monthly output is taken as a sampling unit. The sampling volume of each unit is not less than 10 rolls. The number of mesh holes, mesh diameter, mesh quality per square meter, number of breaks, joints and mesh defect area of the finished net need to be inspected one by one. 5.3 Tensile strength and elongation of finished silk Three sections are measured for each roll of finished silk. If two out of three measurements are qualified, it can be determined that the tensile strength and elongation of this roll of silk are qualified. If two of the three determinations are unqualified, six sections should be re-measured. If 1/2 of the determination results are still unqualified, this single wire is unqualified.
5.4 If one of the test results of the main elements and trace impurity elements does not meet the requirements of this standard, samples should be taken from the reserved samples for re-testing twice. If one of the re-tests is still unqualified, this batch of products will not be accepted. If the diameter of the finished wire does not meet the requirements of this standard, double samples should be taken from the unit wire for re-testing. If the re-test is still unqualified, each single wire should be tested. 2
HG2271.1—92
If one of the measurement points of the number of meshes of the finished net does not meet the requirements of this standard, double the measurement points should be taken for re-testing. If unqualified measurement points still appear after re-testing, it should be judged as unqualified. If one of the inspection results of the finished net diameter and the quality of net per square meter does not meet the requirements of this standard, the product will not be accepted. If one of the inspection results of the defective net area and the number of broken joints does not meet the requirements specified in Table 4, it will be judged as a defective product. 5.5 The user has the right to accept the finished net received according to this standard. When the inspection result does not meet the requirements of this standard, the manufacturer should be contacted and handled; when there is a quality dispute between the supply and demand parties, an authoritative department should be hired for arbitration. 5.6 The inspection result is judged by the rounded value comparison method. 6 Marking, packaging, transportation, storage
6.1 Each platinum net leaving the factory should have a platinum label with the number of the net. 6.2 When packaging the product, the net surface is padded with soft thin white paper and rolled up on the alloy aluminum tube one by one. The whole sheet is then wrapped with kraft paper and tied with a thin rope, and then packed into the alloy aluminum packaging tube together with the quality certificate. When shipping, the supply and demand parties need to check the number and quality of the net in person (g): After both parties confirm that it is correct, the packaging tube is sealed with lead and escorted by two special personnel. 6.3 During transportation and storage, the product should be protected from mechanical damage, oil pollution or chemical corrosion. Additional instructions:
This standard is proposed by the Science and Technology Department of the Ministry of Chemical Industry of the People's Republic of China: This standard is under the jurisdiction of the fertilizer catalyst standardization technical unit of the Ministry of Chemical Industry; This standard is drafted by Taiyuan Fertilizer Plant; The main drafters of this standard are Wang Jianguo, Wu Chenghua, Bao Hongfen, Tian Guixia, and Wang Enyi. From the date of implementation of this standard, the original standard HG1-153083 "Sales Catalyst S201 Type for Nitric Acid Production" issued by the Ministry of Chemical Industry of the People's Republic of China will be invalid.
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