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GB/T 23513.5-2009 PDF English

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GB/T 23513.5-2009: Chemical analysis methods for germanium concentrate -- Part 5: Determination of silica content -- Gravimetry
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GB/T 23513.5-200990 Add to Cart Auto, 9 seconds. Chemical analysis methods for germanium concentrate -- Part 5: Determination of silica content -- Gravimetry Valid

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GB/T 23513.5-2009: Chemical analysis methods for germanium concentrate -- Part 5: Determination of silica content -- Gravimetry


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GB/T23513.5-2009 GB ICS 77.120.99 H 66 NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA Chemical analysis methods for germanium concentrate - Part 5. Determination of silica content - Gravimetry Issued on: APRIL 08, 2009 Implemented on: FEBRUARY 01, 2010 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People’s Republic of China; Standardization Administration of the People’s Republic of China.

Table of Contents

Foreword ... 3 1  Scope ... 4 2  Methods and principles ... 4 3  Reagents ... 4 4  Analysis steps ... 4 5  Calculation of analysis result ... 6 6  Precision ... 6 7  Quality assurance and control ... 7

Foreword

GB/T 23513 Chemical analysis methods for germanium concentrate is consisted of five parts as follows. — Part 1. Determination of germanium content - Potassium iodate titration; — Part 2. Determination of arsenic content - Ferrous ammonium sulfate titration; — Part 3. Determination of sulfur content - Barium sulfate gravimetry; — Part 4. Determination of fluoride content - ISE; — Part 5. Determination of silica content – Gravimetry. This part is part 1. This part was proposed by China Nonferrous Metals Industry Association. This part shall be under the jurisdiction of National Technical Committee on Nonferrous Metals of Standardization Administration of China. The responsible drafting organization of this part. Yunnan Lincang Xinyuan Germanium Co., Ltd. The participating drafting organizations of this part. Zhongjin Lingnan Shaoguan Melting Factory, Hunan Huaihua Hongjiang Hengchang Germanium Co., Ltd., Nanjing Germanium Co., Ltd., and Beijing Guojinghui Infrared Optics Technology Co., Ltd. The chief drafting staffs of this Standard. Bao Wendong, Li Hecheng, Pu Shikun, Zheng Hong, and Zhang Liping. Chemical analysis methods for germanium concentrate Part 5. Determination of silica content - Gravimetry

1  Scope

This part of GB/T 23513 specifies the determination method of silica content in germanium concentrate. This part applies to the determination of silica content in germanium concentrate. Determination range. 0.5%-60%. 2  Methods and principles Melt the sample with sodium hydroxide and sodium peroxide. Use water to leach. Add hydrochloric acid to dehydrate, so as silicate is precipitated. Evaporate to remove the germanium. Add gelatin to condense, filter and separate the silicate. Weigh the mass after ashing and burning.

3  Reagents

Unless otherwise stated, only analytical reagents AND distilled water or water with equivalent purity can be used in the analysis. 3.1 Sodium hydroxide (NaOH). 3.2 Sodium peroxide (Na2O2). 3.3 Hydrochloric acid (ρ 1.19 g•mL-1). 3.4 Hydrochloric acid (1 + 3). 3.5 Hydrochloric acid (5 + 95). 3.6 Gelatin solution (1%). Prepare when using. 4  Analysis steps 4.1 Sample volume Weigh the sample according to Table 1, accurate to 0.0001g. 7  Quality assurance and control It shall use the national standard materials or industry-level standard materials (if there is no such sample, it may use control sample to substitute). Verify the validity of this analytical method standard once a week or every 2 weeks. When the process is out of control, the root cause reason shall be found out; and re-verify it after correcting the error. >8.00-10.00 0.40 >10.00-50 0.50 ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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