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GB/T 23513.5-2009 PDF in English

GB/T 23513.5-2009 (GB/T23513.5-2009, GBT 23513.5-2009, GBT23513.5-2009)
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GB/T 23513.5-2009: PDF in English (GBT 23513.5-2009)

GB/T 23513.5-2009
ICS 77.120.99
H 66
Chemical analysis methods for germanium
concentrate - Part 5. Determination of silica
content - Gravimetry
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
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 
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 PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.