GB/T 26019-2010 English PDF

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GB/T 26019-2010: Methods for chemical analysis of high impurity tungsten mineral -- Determination of tungsten trioxide content -- Twice separation and igniting gravimetric method
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 26019-2010	189	Add to Cart	3 days	Methods for chemical analysis of high impurity tungsten mineral -- Determination of tungsten trioxide content -- Twice separation and igniting gravimetric method	Valid

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Basic data

Standard ID: GB/T 26019-2010 (GB/T26019-2010)
Description (Translated English): Methods for chemical analysis of high impurity tungsten mineral -- Determination of tungsten trioxide content -- Twice separation and igniting gravimetric method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H63
Classification of International Standard: 77.120.99
Word Count Estimation: 8,898
Date of Issue: 1/10/2011
Date of Implementation: 10/1/2011
Regulation (derived from): Announcement of Newly Approved National Standards 2011 No. (No. 166 overall) 1
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
Summary: This Standard specifies the determination of high impurity tungsten ore of tungsten trioxide content. This Standard is applicable to the phosphorus content of less than 2%, titanium content of less than 1%, 2% tungsten ore Determination of tungsten trioxide content is less than the amount of tin. Tungsten trioxide measurement range: 20% or more.

GB/T 26019-2010: Methods for chemical analysis of high impurity tungsten mineral -- Determination of tungsten trioxide content -- Twice separation and igniting gravimetric method

---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.
Methods for chemical analysis of high impurity tungsten mineral.Determination of tungsten trioxide content.Twice separation and igniting gravimetric method ICS 77.120.99 H63 National Standards of People's Republic of China High Impurity Tungsten Chemical Analysis Method Determination of tungsten trioxide content Secondary separation and burning weight method 2011-01-10 released 2011-10-01 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 by the National Nonferrous Metals Standardization Technical Committee (SAC/TC23) centralized. The drafting unit of this standard. Chenzhou Diamond Tungsten Products Co., Ltd., Xiamen Tungsten Industry Co., Ltd., Ganzhou Institute of Nonferrous Metals, Lake Nan Chenzhou Shizhuyuan Nonferrous Metals Co., Ltd., Luoyang Luanchuan Molybdenum Group Co., Ltd. The main drafters of this standard. Du Fangcai, Zhang Yuanxia, Tang Yihui, Zhu Guirong, Wang Caiyun, Kuang Jing, Pan Jianzhong, Wang Zhoulin, Lei Yong, Cui Yajuan, Zhang Chunling. High Impurity Tungsten Chemical Analysis Method Determination of tungsten trioxide content Secondary separation and burning weight method

1 Scope

This standard specifies the determination of tungsten trioxide in high-quality tungsten. This standard is applicable to the determination of the amount of tungsten oxide in tungsten ore with a phosphorus content of less than 2%, a titanium content of less than 1% and a tin content of less than 2%. three Tungsten oxide measurement range. 20% or more.

2 method summary

Samples in the presence of a small amount of ammonium fluoride, hydrochloric acid, nitric acid, perchloric acid dissolved, concentrated to white smoke to get rid of excess fluoride and nitric acid Roots, tungsten tung tung acid precipitation, filtration, separation with most of the coexisting elements, with ammonia dissolved tungstic acid, adding ferric nitrate and beryllium nitrate precipitation separation His impurities, the filtrate by steaming, burning, to hydrofluoric acid to silicon, and then said after the amount of tungsten trioxide. The amount of tungsten trioxide in the residue was measured by spectrophotometry, Correction results. When the molybdenum content is greater than 0.3%, the results need to be corrected.

3 reagent

Unless otherwise stated, the reagents used in this section are analytical reagents that conform to national standards or industry standards, and the water used is distilled water. 3.1 Sodium peroxide. 3.2 Ammonium fluoride. 3.3 Disodium EDTA (EDTA). 3.4 Hydrochloric acid (ρ1.19g/mL). 3.5 nitric acid (ρ1.42g/mL). 3.6 hydrofluoric acid (ρ1.15g/mL). 3.7 anhydrous ethanol. 3.8 ammonia (ρ0.90g/mL). 3.9 aqueous ammonia solution (1 1). 3.10 aqueous ammonia solution (1 4). 3.11 Ammonia-Ammonium Nitrate Mixture. Remove 40 mL of aqueous ammonia (3.9), add 450 mL of water, add 2 mL of nitric acid (3.5). 3.12 Sodium hydroxide solution (24 g/L). 3.13 Sodium hydroxide solution (100 g/L). 3.14 Sodium hydroxide solution (50 g/L). 3.15 perchloric acid (ρ1.67g/mL). 3.16 Perchloric acid wash solution (1.199). 3.17 ferric nitrate solution. Weigh 1g of pure iron powder, add 50mL nitric acid (3.5), dissolved in the electric furnace dissolved in water after dilution 1000mL. 3.18 beryllium nitrate solution. weighed 10g analysis of pure BeSO4 · 4H2O, add 400mL water dissolved, add 50mL ammonia (3.8), heating boiled ......

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