GB/T 4291-2017 English PDF

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GB/T 4291-2017: Synthetic cryolite
Status: Valid

GB/T 4291: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 4291-2017	119	Add to Cart	3 days	Synthetic cryolite	Valid
GB/T 4291-2007	239	Add to Cart	3 days	Synthetic cryolite	Obsolete
GB/T 4291-1999	399	Add to Cart	3 days	Synthetic cryolite	Obsolete
GB/T 4291-1984	RFQ	ASK	3 days	Synthetic cryolite	Obsolete

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Basic data

Standard ID: GB/T 4291-2017 (GB/T4291-2017)
Description (Translated English): Synthetic cryolite
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: D59
Classification of International Standard: 71.100.10
Word Count Estimation: 6,678
Date of Issue: 2017-07-12
Date of Implementation: 2018-02-01
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 4291-2017: Synthetic cryolite

---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.
Synthetic cryolite ICS 71.100.10 D59 National Standards of People's Republic of China Replacing GB/T 4291-2007 cryolite 2017-07-12 released 2018-02-01 Implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 4291-2007 "cryolite". This standard compared with GB/T 4291-2007, in addition to editorial changes, the main technical changes are as follows. --- normative reference document GB/T 1250 modified to GB/T 8170 (see Chapter 2,.2007 edition of Chapter 2); - increase the number of bits reserved for the calculated results (see 4.1.1); - a series of product additions (see 4.2); (Fe2O3), sulfate (SO42-), calcium oxide (CaO), burn-down index of CH-0, CH-1 (Fe2O3), sulfate (SO42-), calcium oxide (CaO); CM-0, CM-1 in the sulfate (SO42-) (see 4.2); - the contents of Table 1, note 2, into the requirements (see 4.2,.2007 edition 4.3); - increased the requirements for cryolite color and agglomeration (see 4.3); --- Remove the net weight of 40kg in 7.1 (see.2007 edition 7.1). This standard is proposed by China Nonferrous Metals Industry Association. This standard is owned by the National Committee for the Standardization of Nonferrous Metals (SAC/TC243). The drafting of this standard. Polyfluoride Chemical Co., Ltd., Hunan Nonferrous Fluorine Chemical Group Co., Ltd., Silver Zhongtian Chemical Co., Ltd. Any company, Yunnan Yun aluminum Chung Xin Aluminum Co., Ltd., the letter of the aluminum group. The drafters of this standard. Hou Hongjun, Yang Huachun, Xue Xujin, Shi Xihua, Ye Wenhao, Zhu Chonggao, Li Zhijian, Che Lizhi, Jia Shuqin, Dong Aiyun. This standard replaced the previous version of the standard release. GB/T 4291-1984, GB/T 4291-1999, GB/T 4291-2007. cryolite

1 Scope

This standard specifies the requirements, test methods, inspection rules, packaging, marking, transportation, storage, and order (or contract) of cryolite content. This standard applies to hydrofluoric acid, fluorosilicic acid or sodium fluorosilicate and other synthetic method of the preparation of cryolite, which is mainly used for aluminum electrolysis production.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. Representation and Judgment of Numerical Correction Rule and Limit Value of GB/T 8170 YS/T 273 (all parts) method for chemical analysis of cryolite and determination of physical properties

3 terms and definitions

The following terms and definitions apply to this document. 3.1 The ratio of the amount of NaF to AlF3 in the cryolite product.

4 requirements

4.1 grades and classifications 4.1.1 cryolite according to its molecular score for two categories. Molecular ratio of 2.80 ~ 3.00 for the polymer than the cryolite, the molecular ratio of 1.00 ~ < 2.80 For ordinary cryolite. The molecular ratio can be calculated according to formula (1). Cryolite ratio = wNa wAl × 26.9815 22.9897 (1) Where. wNa - mass fraction of sodium in cryolite products,%; wAl - quality fraction of aluminum in cryolite products,%; 26.9815 --- relative atomic mass of aluminum; 22.9897 --- Relative atomic mass of sodium. The value is reserved for two digits after the decimal point. 4.1.2 cryolite according to the molecular score for the four grades. CH-0, CH-1, CM-0, CM-1. Grade with two English letters plus "-" plus 1-digit form. The letter C indicates the cryolite logo (C is the first letter of the name of the cryolite); the letters H and M Said the cryolite class, where H is the polymer than the cryolite, M is the ordinary cryolite, and the number (0 or 1) is the sequence number. 4.2 Chemical composition and physical properties The chemical composition and physical properties of cryolite shall be in accordance with Table 1. There is a special requirement for chemical composition and physical properties ......

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