JC/T 2625-2021 PDF EnglishUS$110.00 · In stock · Download in 9 seconds
JC/T 2625-2021: Titanium gypsum Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
JC/T 2625-2021: Titanium gypsum---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/JCT2625-2021BUILDING MATERIALS INDUSTRY STANDARD ICS 91.100.10 CCS Q 62 Titanium gypsum 钛石膏 Issued on: DECEMBER 02, 2021 Implemented on: APRIL 01, 2022 Issued by. Ministry of Industry and Information Technology of the People's Republic of China. Table of ContentsForeword... 3 1 Scope... 4 2 Normative references... 4 3 Terms and definitions... 4 4 Classification and labeling... 4 5 Requirements... 5 6 Test methods... 5 7 Inspection rules... 7 8 Packaging, marking, transportation and storage... 8 Titanium gypsum1 ScopeThis document specifies the classification and labeling, requirements, test methods, inspection rules and packaging, marking, transportation and storage of titanium gypsum. This document applies to the titanium gypsum - with calcium sulfate dihydrate as the main component - that is produced by the neutralization of limestone powder, lime, carbide slag AND acidic wastewater during the production of titanium dioxide by the sulfuric acid method.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document. GB/T 2007.1, General rules for the sampling and sample preparation of minerals in bulk - Sampling by manual method GB/T 5484-2012, Methods for chemical analysis of gypsum GB 6566, Limits of radionuclides in building materials3 Terms and definitionsNo terms and definitions need to be defined in this document.4 Classification and labeling4.1 Classification Titanium gypsum is divided into grade-1 product (A), grade-2 product (B) and grade-3 product (C), according to the content of calcium sulfate dihydrate in titanium gypsum, from high to low. 4.2 Labeling It is labeled in the order of product name, document number, and classification. Where. ω(CaSO4•2H2O) – calcium sulfate dihydrate (CaSO4•2H2O) content (mass fraction), %; ωC – crystal water content (mass fraction), %; 20.9275 – conversion factor of crystal water content to calcium sulfate dihydrate (CaSO4•2H2O) content. The calculation results are accurate to 0.01%. 6.2 Determination of ferric oxide (Fe2O3) content Determine according to the o-phenanthroline spectrophotometry (standard method) in GB/T 5484-2012. 6.3 Determination of water-soluble magnesium oxide (MgO) content Determine according to Chapter 27 of GB/T 5484-2012. 6.4 Determination of water-soluble sodium oxide (Na2O) content Determine according to Chapter 28 of GB/T 5484-2012. 6.5 Determination of water-soluble potassium oxide (K2O) content Determine according to Chapter 28 of GB/T 5484-2012. 6.6 Determination of chloride ion (Cl-) content Determine according to Chapter 29 of GB/T 5484-2012. 6.7 pH value Determine according to Chapter 25 of GB/T 5484-2012. 6.8 Limits of radionuclides Determine according to the method specified in GB 6566. 6.9 Determination of attached water content Determine according to Chapter 9 of GB/T 5481-2012.Drying conditions. dry in a constant temperature drying oven at (40±2) °C, where the first drying time is 2 h.7 Inspection rules7.1 Inspection classification 7.1.1 Delivery inspection The delivery inspection items include. attached water content, calcium sulfate dihydrate (CaSO4•2H2O), ferric oxide (Fe2O3) and pH value. 7.1.2 Type inspection The type inspection items include all the requirements specified in Chapter 5.The type inspection shall be carried out in any of the following cases. a) When there are major changes in raw materials, ratio, process and product structure; b) Once a year during normal production; c) When the production - which has been suspended for more half a year - is resumed; d) When there is a significant difference between the delivery inspection results and the previous type inspection results. 7.2 Batching and Sampling 7.2.1 Batching Take 1 000 t of products as one batch, and any amount of products less than 1 000 t as one batch, too. 7.2.2 Sampling Take samples according to the method specified in GB/T 2007.1; the total sampling amount per batch shall not be less than 2 kg. Divide the samples into two equal parts, one as a test sample and the other as a spare sample which shall be sealed and stored. 7.3 Judgement rules If the inspection results of the tested samples meet the requirements of Chapter 5, judge the batch of products to be qualified. If any of the inspection results does not meet the requirements specified in Chapter 5, use the spare sample to re-inspect the unqualified item. If the re-inspection is qualified, judge the batch of products to be qualified; otherwise, judge the batch to be unqualified. If two or more of the inspection results do not meet the requirements specified in Chapter 5, judge the batch of products to be unqualified. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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