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YS/T 231-2015 PDF English

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YS/T 231-2015: Tungsten concentrate
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YS/T 231: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
YS/T 231-2015English70 Add to Cart 0-9 seconds. Auto-delivery Tungsten concentrate Valid
YS/T 231-2007English239 Add to Cart 2 days Tungsten concentrate Obsolete
YS/T 231-1994English279 Add to Cart 3 days Technical requirements for tungsten concentrate Obsolete

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YS/T 231-2015: Tungsten concentrate

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YS NONFERROUS METAL INDUSTRY STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 73.060.99 D 43 Replacing YS/T 231-2007 Tungsten concentrate 钨精矿 Issued on: APRIL 30, 2015 Implemented on: OCTOBER 01, 2015 Issued by. Ministry of Industry and Information Technology of the People’s Republic of China

Table of Contents

Foreword ... 3  1 Scope ... 4  2 Normative references ... 4  3 Requirements ... 4  4 Test Methods ... 5  5 Inspection rules ... 6  6 Marks, package, transportation, storage and quality certificate ... 7  7 Contents of the orders (or contracts) ... 8 

Foreword

This Standard is drafted according to the rules given in the GB/T 1.1-2009. This Standard replaces YS/T 213-2007 “Tungsten concentrate”. Compared with YS/T 213-2007, the main changes of this Standard are as follows. - ADJUST the chemical composition accordingly; - REVISE the test methods and the inspection rules. This Standard was proposed by and shall be under the jurisdiction of China National Standardization Technical Committee of Nonferrous Metals. Drafting organizations of this Standard. Ganzhou Nonferrous Metallurgy Research Institute, Chenzhou Diamond Tungsten Products Co., Ltd, Hunan Shizhuyuan Nonferrous Metals Co., Ltd, China Molybdenum Co., Ltd (Luoyang). The main drafters of this Standard. Ye Chunsheng, Yang Xinhua, Xie Shengde, Jiang Wenwei, Zhang Bilan, Tang Desheng, Xie Shiyong, Liu Hong, Pan Jianzhong, Zhang Shubiao, Li Ying, Wen Zhimin, Li Chun hai, Tian Yonghong. The historical versions replaced by this Standard are as follows. - YB/T 504-65, GB 52825-19814; - YS/T 231-1994, YS/T 231-2007. Tungsten concentrate

1 Scope

This Standard specifies the requirements, test methods, inspection rules, marks, package, transportation, storage, quality certificate and orders (or contracts) for the tungsten concentrate. This Standard applies to tungsten concentrate products selected in mine; it can be used for producing ammonium paratungstate, tungstic acid, ammonium metatungstate, tungsten oxide etc.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. GB/T 1480 Metallic powder - Determination of particle size by dry sieving GB/T 4414 Methods of sampling and sample preparation of tungsten concentrates in bags GB/T 6150 (All parts) Methods for chemical analysis of tungsten concentrates GB/T 26019 Methods for chemical analysis of high impurity tungsten mineral - Determination of tungsten trioxide content - Twice separation and igniting gravimetric method

3 Requirements

3.1 Product classification According to mineral types, tungsten concentrate is divided into scheelite and wolframite; according to chemical composition, it is divided into total 14 types – premium grade, grade I, grade II, grade III, grade IV, grade V, mixed tungsten concentrate, and tungsten-slime. Mixed tungsten concentrate refers to the scheelite and wolframite - without strictly-separated tungsten concentrate. Tungsten-slime refers to tungsten products of which the granularity is less than 0.074 mm [The content (mass fraction) of WO3 is 20%~40% ], and the impurity contents are relatively high. 6.2.1 Use the double-ply bags to pack the tungsten concentrate. The bag openings shall be sealed. The materials of packages shall be negotiated by the suppliers and the buyers. The net weight of each bag of products shall be 50 kg or 1000 kg. 6.2.2 Keep dry when transporting. The products shall be stored in the dry place but not the open air. Prevent from the damage of the packages. 6.3 Quality certificate A quality certificate shall be attached to each batch of products, which shall note. a) Name of suppliers; b) Name of products; c) Batch number; d) Variety; e) Number and net weight; f) Inspection results and the marks of technical supervision departments; g) Serial number of this Standard; h) Date of exit-factory.

7 Contents of the orders (or contracts)

The orders listed by this Stander shall include following contents. a) Name of products; b) Variety; c) Specific requirements of impurity content; d) Quantity and net weight; e) Number of this Standard; f) Others. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.