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Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 7143-2025: Methods for chemical analysis of silica sand for foundry Status: Valid GB/T 7143: Historical versions
Basic dataStandard ID: GB/T 7143-2025 (GB/T7143-2025)Description (Translated English): Methods for chemical analysis of silica sand for foundry Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: J31 Classification of International Standard: 25.120.20 Word Count Estimation: 26,230 Date of Issue: 2025-02-28 Date of Implementation: 2025-09-01 Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration GB/T 7143-2025: Methods for chemical analysis of silica sand for foundry---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.GB/T 7143-2025 English version. Methods for chemical analysis of silica sand for foundry ICS 25.120.20 CCSJ31 National Standard of the People's Republic of China Replace GB/T 7143-2010 Chemical analysis method of silica sand for foundry Released on 2025-02-28 2025-09-01 Implementation State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 1 4 Sample preparation 1 5 Test methods 1 Table 1 Permissible error of aluminum oxide content determined by EDTA complexometric titration Table 2 Amount of sample removed for determination of alumina content 8 Table 3 Permissible error of the determination of aluminum oxide content by chrome azuro blue S photometry 8 Table 4 Permissible error of sulfosalicylic acid spectrophotometric determination of iron oxide content 10 Table 5 Amount of sample removed for determination of iron oxide content 10 Table 6 Permissible error of iron oxide content determined by o-phenanthroline photometric method 11 Table 7 Amount of sample removed for determination of titanium oxide content 12 Table 8 Permissible error in determination of titanium oxide content by diantipyryl methane photometry 12 Table 9 Permissible error of calcium oxide content determined by EDTA complexometric titration 14 Table 10 Allowable error of magnesium oxide content determined by EDTA complexometric titration 16 Table 11 Preparation of sodium chloride and potassium chloride mixed standard solution series 16 Table 12 Testing conditions for sodium oxide and potassium oxide content 17 Table 13 Permissible deviation of potassium oxide and sodium oxide content determined by flame photometry 17 Table 14 Preparation of mixed standard series solution 18 Table 15 Measurement wavelength of each element 19 Table 16 Permissible deviation of chemical composition of silica sand determined by fluorescence spectroscopy 21ForewordThis document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 7143-2010 "Chemical analysis methods for silica sand for foundry". Compared with GB/T 7143-2010, except for the structural adjustment In addition to the integration and editorial changes, the main technical changes are as follows. a) The scope of application of the standard has been changed (see Chapter 1, Chapter 1 of the.2010 edition); b) The requirements for sample preparation have been changed (see 4.2, 3.2 and 3.3 of the.2010 edition); c) The analytical procedure for determining the silicon dioxide content by the hydrochloric acid primary dehydration mass-molybdenum blue spectrophotometric method has been changed (see 5.2.1.4, 4.1.2.4 of the.2010 edition); d) The test method overview has been changed (see 5.1.2, Chapter 4 of the.2010 edition); e) The indicator for calcium oxide determination has been changed (see 5.4.2.1, 4.3.1.1 of the.2010 edition); f) The calcium oxide determination procedure has been changed (see 5.4.2.4, 4.3.1.4 of the.2010 edition); g) The tolerance for the determination of magnesium oxide content by EDTA complexometric titration has been changed (see 5.4.3.6, 4.3.2.6 of the.2010 edition); h) Added fluorescence spectrometry for the determination of silicon dioxide, aluminum oxide, iron oxide, titanium oxide, calcium oxide, magnesium oxide, potassium oxide and sodium oxide Content (see 5.6); i) Delete the determination of acid consumption value (see 4.5 of the.2010 edition). Please note that some of the contents in this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document is proposed and coordinated by the National Casting Standardization Technical Committee (SAC/TC54). This document was drafted by. Jinan Shengquan Group Co., Ltd., China Machinery Engineering Institute Group Shenyang Foundry Research Institute Co., Ltd., Shandong Heavy Equipment Testing Technology Co., Ltd., Chongqing Changjiang Modeling Materials (Group) Co., Ltd., Guangxi Lanke Resources Recycling Co., Ltd. Zhejiang Mechanical and Electrical Vocational and Technical University, Huazhong University of Science and Technology, Ludong University, Qingdao University of Technology, Shenyang University of Technology, Wuhan University of Technology, Chengde Dongwei New Material Technology Co., Ltd., Wuxi Sanfeng Instrument Equipment Co., Ltd., Guangdong Zhuli Casting Technology Co., Ltd., Clariant Chemical Technology (Shanghai) Co., Ltd., Meike (Guangzhou) New Materials Co., Ltd., Shandong Institute of Standardization, Shenzhen Information Vocational and Technical College, Jinan Shengquan Casting Materials Co., Ltd., Dongfeng Forging Co., Ltd., Yantai Binglun Intelligent Machinery Technology Co., Ltd., Hubei Gucheng County Donghua Machinery Machinery Co., Ltd., Jiangsu Xihua Casting Co., Ltd., Henan Weiye New Materials Co., Ltd., Jiangyin Tianrun Modeling Materials Technology Co., Ltd., Taiyuan Sangao Energy Development Co., Ltd., Jiangsu Jinyang Machinery Co., Ltd., Chiping Xinfa Aluminum Products Co., Ltd., Changsha Deka Technology Co., Ltd. Company, Zhejiang Aoli New Materials Technology Co., Ltd., Xi'an Aerospace Engine Co., Ltd., CRRC Qishuyan Locomotive and Rolling Stock Technology Research Institute Co., Ltd. Co., Ltd. and AECC Harbin Dongan Engine Co., Ltd. The main drafters of this document are. Li Donghua, Gao Hui, Zhao Zhenyu, Li Yuancai, Wang Yu, Liu Jingmei, Liu Ye, He Zefen, Wang Lifeng, Liu Guomei, Liu Chunjing, Yu Benli, Zhang Yancheng, Wang Xiaodong, Xue Jiang, Yu Ruilong, Liu Chunxia, Sun Pu, Li Dongyu, Yin Bing, Chen Xiulin, Liu Weihua, Chen Kaimin, Wan Peng, Gao Xin, Zhang Zhifeng, Lü Chenming, Ma Tao, Cui Lanfang, Wang Xiaolei, Zhang Shiwei, Li Wenao, Liu Qinshuang, Liu Jun, Lü Jiyang, Sha Jinyang, Zhang Chenggen. This document was first issued in 1986, revised for the first time in.2010, and this is the second revision. Chemical analysis method of silica sand for foundry1 ScopeThis document describes the sample preparation and test methods for the chemical composition analysis of silica sand for foundry use. This document applies to silicon dioxide, aluminum oxide, iron oxide, titanium oxide, oxygen and other minerals in natural silica sand, selected quartz sand and artificial quartz sand for foundry use. Determination of chemical components such as calcium oxide, magnesium oxide, potassium oxide, sodium oxide content, etc. Note. The determination methods listed in this document should be selected according to specific circumstances.2 Normative referencesThe contents of the following documents constitute essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 601 Preparation of standard titration solutions for chemical reagents GB/T 603 Preparation of preparations and products used in chemical reagent test methods GB/T 2684 Test methods for foundry sand and mixtures GB/T 5611 Casting Terminology GB/T 6682 Specifications and test methods for water used in analytical laboratories GB/T 8170 Rules for rounding off values and expression and determination of limit values GB/T 21114-2019 X-ray fluorescence spectrochemical analysis of refractory materials - Fused glass disc method3 Terms and definitionsThe terms and definitions defined in GB/T 5611 apply to this document. 4.Sample preparation 4.1 The sample should be representative and uniform, without any foreign impurities. 4.2 The test sample is divided into four parts (if the particle size is too large, it should be crushed to less than 0.8 mm and magnets should be used to remove the particles that may be introduced during the crushing process). After the iron is added, it is further reduced), and finally about 20g of sample is obtained, which is ground until all of it passes through a 75μm sieve (i.e., No..200 sieve). Weigh the bottle, dry it at 105℃~110℃ for 2h, then put it in a desiccator and cool it for later use.5 Test methods5.1 Overview 5.1.1 Unless otherwise specified, the standard solutions, preparations and products used in the analysis shall be prepared in accordance with the provisions of GB/T 601 and GB/T 603. Use analytically pure reagents and grade 3 water in accordance with GB/T 6682. All are factory original concentrations. 5.1.2 All test methods shall be measured twice in parallel, and the average value shall be taken as the final test result; the test result shall be determined according to GB/T 8170. ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 7143-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 7143-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 7143-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 7143-2025_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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