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GB/T 20899.1-2019 English PDF (GBT20899.1-2019)
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GB/T 20899.1-2019: Methods for chemical analysis of gold ores -- Part 1: Determination of gold content
GB/T 20899.1-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.99
D 46
Replacing GB/T 20899.1-2007
Methods for chemical analysis of gold ores - Part 1:
Determination of gold content
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: NOVEMBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Method 1: Fire assay gravimetric method ... 5
3 Method 2: Fire assay gold concentration - flame atomic absorption spectrometry . 11
4 Method 3: Activated carbon enrichment - flame atomic absorption spectrometry .. 19
5 Method 4: Activated carbon enrichment - iodometric method ... 25
Methods for chemical analysis of gold ores - Part 1:
Determination of gold content
WARNING -- Persons using this Standard shall have practical experience in
formal laboratory work. This Standard does not address all safety issues. It is the
user's responsibility to take appropriate safety and health measures and to ensure
compliance with the conditions stipulated by relevant national regulations.
1 Scope
This Part of GB/T 20899 specifies the method to determine gold content in gold ores.
This Part is applicable to the determination of gold content in gold ores. The
determination range of Method 1 is 0.20g/t~150.0g/t. The determination range of
Method 2 is 0.10g/t~100.0g/t. The determination range of Method 3 is 0.10g/t~100.0g/t.
The determination range of Method 4 is 0.30g/t~100.0g/t.
2 Method 1: Fire assay gravimetric method
2.1 Method summary
The test material is batched and melted to obtain lead buttons containing precious
metals and brittle slag of appropriate mass. Gold, silver and lead buttons are separated
by ash blowing to obtain gold-silver composite particles. After the granules are
separated by nitric acid, use the gravimetric method to determine the gold content.
2.2 Reagents and materials
Unless otherwise stated, it shall only use the confirmed analytically-pure reagents AND
distilled water or deionized water or equivalent-pure water in the analysis.
2.2.1 Sodium carbonate: technically pure, powdery.
2.2.2 Lead oxide: technically pure, powder. The gold content in lead oxide is less than
0.02g/t.
2.2.3 Borax: technically pure, powdery.
2.2.4 Glass powder: particle size ≤0.18mm.
2.2.5 Silica: technically pure, powdery.
2.2.6 Potassium nitrate: technically pure, powdery.
2.2.7 Flour.
2.2.8 Covering agent (2+1): Mix two portions of sodium carbonate and one portion of
borax.
2.2.9 Pure silver (wAg≥99.99%).
2.2.10 Silver nitrate solution (10g/L): Weigh 5.000g of sterling silver (2.2.9). Place in
a 300mL beaker. Add 20mL of nitric acid solution (2.2.13). Heat at a low temperature
till it is completely dissolved. Cool to room temperature. Transfer it to a 500mL
volumetric flask. Use nitric acid solution (2.2.13) to rinse the beaker. Combine the
washing liquid into the volumetric flask. Use water to dilute to the scale. Mix well. 1mL
of this solution contains 10mg of silver.
2.2.11 Nitric acid (ρ=1.42g/mL).
2.2.12 Nitric acid solution (1+7).
2.2.13 Nitric acid solution (1+2).
2.3 Instruments and equipment
2.3.1 Assay crucible: The material is refractory clay. The volume is about 300mL or
ensure that the depth of placing the test material does not exceed 3/4 of the depth of the
crucible.
2.3.2 Magnesia ashtray: Cement (No. 425), magnesia (≤0.18mm) and water are mixed
evenly according to the mass ratio (15:85:10). Compress and mold on the ashtray. The
volume is not less than 5mL. Reserve after 3 months of drying in the shade.
2.3.3 Colorimetric tube: 25mL.
2.3.4 Balance: The resolution is not more than 0.01g.
2.3.5 Balance: The resolution is not more than 0.001mg.
2.3.6 Electric melting furnace: The maximum heating temperature is not lower than
1200℃.
2.3.7 Ash blowing electric furnace: the maximum heating temperature is not lower than
1000℃.
2.3.8 Pulverizer.
2.3.9 Cast iron mold.
2.4 Specimen
absorption spectrometry
3.1 Method summary
The test material is batched and melted. Obtain proper mass of lead buttons containing
precious metals and brittle slag. Gold, silver and lead buttons are separated by ash
blowing to obtain gold-silver composite particles. The composite particles are dissolved
by nitric acid and aqua regia. Use a flame atomic absorption spectrometer to determine
the gold absorbance value at a wavelength of 242.8nm.
3.2 Reagents and materials
Unless otherwise stated, it shall only use the confirmed analytically-pure reagents AND
distilled water or deionized water or equivalent-pure water in the analysis.
3.2.1 Sodium carbonate: technically pure, powdery.
3.2.2 Lead oxide: technically pure, powdery. The gold content in lead oxide is less than
0.02g/t.
3.2.3 Borax: technically pure, powdery.
3.2.4 Glass powder: particle size ≤0.18mm.
3.2.5 Silica: technically pure, powdery.
3.2.6 Potassium nitrate: technically pure, powdery.
3.2.7 Flour.
3.2.8 Covering agent (2+1): mix two portions of sodium carbonate and one portion of
borax.
3.2.9 Pure silver (wAg≥99.99%).
3.2.10 Gold (wAu≥99.99%).
3.2.11 Silver nitrate solution (10g/L): Weigh 5.000g of sterling silver (3.2.9). Place in a
300mL beaker. Add 20mL of nitric acid solution (3.2.14). Heat at a low temperature till
it is completely dissolved. Cool to room temperature. Transfer it into a 500mL
volumetric flask. Use nitric acid solution (3.2.14) to rinse the beaker. Combine the
washing liquid into the volumetric flask. Use water to dilute till the scale. Mix well.
1mL of this solution contains 10mg of silver.
3.2.12 Nitric acid (ρ=1.42g/mL).
3.2.13 Hydrochloric acid (ρ=1.19g/mL).
3.2.14 Nitric acid solution (1+2).
3.2.15 Aqua regia: Mix three volumes of hydrochloric acid and one volume of nitric
acid. Prepare when required.
3.2.16 Sodium chloride solution (200g/L).
3.2.17 Hydrochloric acid solution (1+19).
3.2.18 Gold standard storage solution: Weigh 0.5000g of gold (3.2.10). Place in a
100mL beaker. Add 20mL of aqua regia (3.2.15). Heat at a low temperature till it is
completely dissolved. Remove and cool to room temperature. Transfer it into a 500mL
volumetric flask. Use 20mL of aqua regia (3.2.15) to rinse the beaker. Then use water
to wash the beaker. Combine them in the volumetric flask. Use water to dilute to the
scale. Mix well. 1mL of this solution contains 1.00mg of gold.
3.2.19 Gold standard solution: Pipette 50.00mL of gold standard stock solution (3.2.18)
into a 500mL volumetric flask. Add 10mL of aqua regia (3.2.15). Use water to dilute to
the scale. Mix well. 1mL of this solution contains 100μg of gold.
3.3 Instruments and equipment
3.3.1 Test gold crucible: The material is refractory clay. The volume is about 300mL or
ensure that the depth of placing the sample does not exceed 3/4 of the depth of the
crucible.
3.3.2 Magnesia ashtray: Cement (No. 425), magnesia (< 0.18mm) and water are mixed
evenly according to the mass ratio (15:85:10). Compress and mold on the ashtray. The
volume is not less than 5mL. It shall be used after drying in the shade for 3 months.
3.3.3 Balance: The resolution is not more than 0.01g.
3.3.4 Electric melting furnace: The maximum heating temperature is not lower than
1200℃.
3.3.5 Ash blowing electric furnace: The maximum heating temperature is not lower than
1000℃.
3.3.6 Flame atomic absorp...
Get QUOTATION in 1-minute: Click GB/T 20899.1-2019
Historical versions: GB/T 20899.1-2019
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GB/T 20899.1-2019: Methods for chemical analysis of gold ores -- Part 1: Determination of gold content
GB/T 20899.1-2019
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.060.99
D 46
Replacing GB/T 20899.1-2007
Methods for chemical analysis of gold ores - Part 1:
Determination of gold content
ISSUED ON: DECEMBER 31, 2019
IMPLEMENTED ON: NOVEMBER 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Method 1: Fire assay gravimetric method ... 5
3 Method 2: Fire assay gold concentration - flame atomic absorption spectrometry . 11
4 Method 3: Activated carbon enrichment - flame atomic absorption spectrometry .. 19
5 Method 4: Activated carbon enrichment - iodometric method ... 25
Methods for chemical analysis of gold ores - Part 1:
Determination of gold content
WARNING -- Persons using this Standard shall have practical experience in
formal laboratory work. This Standard does not address all safety issues. It is the
user's responsibility to take appropriate safety and health measures and to ensure
compliance with the conditions stipulated by relevant national regulations.
1 Scope
This Part of GB/T 20899 specifies the method to determine gold content in gold ores.
This Part is applicable to the determination of gold content in gold ores. The
determination range of Method 1 is 0.20g/t~150.0g/t. The determination range of
Method 2 is 0.10g/t~100.0g/t. The determination range of Method 3 is 0.10g/t~100.0g/t.
The determination range of Method 4 is 0.30g/t~100.0g/t.
2 Method 1: Fire assay gravimetric method
2.1 Method summary
The test material is batched and melted to obtain lead buttons containing precious
metals and brittle slag of appropriate mass. Gold, silver and lead buttons are separated
by ash blowing to obtain gold-silver composite particles. After the granules are
separated by nitric acid, use the gravimetric method to determine the gold content.
2.2 Reagents and materials
Unless otherwise stated, it shall only use the confirmed analytically-pure reagents AND
distilled water or deionized water or equivalent-pure water in the analysis.
2.2.1 Sodium carbonate: technically pure, powdery.
2.2.2 Lead oxide: technically pure, powder. The gold content in lead oxide is less than
0.02g/t.
2.2.3 Borax: technically pure, powdery.
2.2.4 Glass powder: particle size ≤0.18mm.
2.2.5 Silica: technically pure, powdery.
2.2.6 Potassium nitrate: technically pure, powdery.
2.2.7 Flour.
2.2.8 Covering agent (2+1): Mix two portions of sodium carbonate and one portion of
borax.
2.2.9 Pure silver (wAg≥99.99%).
2.2.10 Silver nitrate solution (10g/L): Weigh 5.000g of sterling silver (2.2.9). Place in
a 300mL beaker. Add 20mL of nitric acid solution (2.2.13). Heat at a low temperature
till it is completely dissolved. Cool to room temperature. Transfer it to a 500mL
volumetric flask. Use nitric acid solution (2.2.13) to rinse the beaker. Combine the
washing liquid into the volumetric flask. Use water to dilute to the scale. Mix well. 1mL
of this solution contains 10mg of silver.
2.2.11 Nitric acid (ρ=1.42g/mL).
2.2.12 Nitric acid solution (1+7).
2.2.13 Nitric acid solution (1+2).
2.3 Instruments and equipment
2.3.1 Assay crucible: The material is refractory clay. The volume is about 300mL or
ensure that the depth of placing the test material does not exceed 3/4 of the depth of the
crucible.
2.3.2 Magnesia ashtray: Cement (No. 425), magnesia (≤0.18mm) and water are mixed
evenly according to the mass ratio (15:85:10). Compress and mold on the ashtray. The
volume is not less than 5mL. Reserve after 3 months of drying in the shade.
2.3.3 Colorimetric tube: 25mL.
2.3.4 Balance: The resolution is not more than 0.01g.
2.3.5 Balance: The resolution is not more than 0.001mg.
2.3.6 Electric melting furnace: The maximum heating temperature is not lower than
1200℃.
2.3.7 Ash blowing electric furnace: the maximum heating temperature is not lower than
1000℃.
2.3.8 Pulverizer.
2.3.9 Cast iron mold.
2.4 Specimen
absorption spectrometry
3.1 Method summary
The test material is batched and melted. Obtain proper mass of lead buttons containing
precious metals and brittle slag. Gold, silver and lead buttons are separated by ash
blowing to obtain gold-silver composite particles. The composite particles are dissolved
by nitric acid and aqua regia. Use a flame atomic absorption spectrometer to determine
the gold absorbance value at a wavelength of 242.8nm.
3.2 Reagents and materials
Unless otherwise stated, it shall only use the confirmed analytically-pure reagents AND
distilled water or deionized water or equivalent-pure water in the analysis.
3.2.1 Sodium carbonate: technically pure, powdery.
3.2.2 Lead oxide: technically pure, powdery. The gold content in lead oxide is less than
0.02g/t.
3.2.3 Borax: technically pure, powdery.
3.2.4 Glass powder: particle size ≤0.18mm.
3.2.5 Silica: technically pure, powdery.
3.2.6 Potassium nitrate: technically pure, powdery.
3.2.7 Flour.
3.2.8 Covering agent (2+1): mix two portions of sodium carbonate and one portion of
borax.
3.2.9 Pure silver (wAg≥99.99%).
3.2.10 Gold (wAu≥99.99%).
3.2.11 Silver nitrate solution (10g/L): Weigh 5.000g of sterling silver (3.2.9). Place in a
300mL beaker. Add 20mL of nitric acid solution (3.2.14). Heat at a low temperature till
it is completely dissolved. Cool to room temperature. Transfer it into a 500mL
volumetric flask. Use nitric acid solution (3.2.14) to rinse the beaker. Combine the
washing liquid into the volumetric flask. Use water to dilute till the scale. Mix well.
1mL of this solution contains 10mg of silver.
3.2.12 Nitric acid (ρ=1.42g/mL).
3.2.13 Hydrochloric acid (ρ=1.19g/mL).
3.2.14 Nitric acid solution (1+2).
3.2.15 Aqua regia: Mix three volumes of hydrochloric acid and one volume of nitric
acid. Prepare when required.
3.2.16 Sodium chloride solution (200g/L).
3.2.17 Hydrochloric acid solution (1+19).
3.2.18 Gold standard storage solution: Weigh 0.5000g of gold (3.2.10). Place in a
100mL beaker. Add 20mL of aqua regia (3.2.15). Heat at a low temperature till it is
completely dissolved. Remove and cool to room temperature. Transfer it into a 500mL
volumetric flask. Use 20mL of aqua regia (3.2.15) to rinse the beaker. Then use water
to wash the beaker. Combine them in the volumetric flask. Use water to dilute to the
scale. Mix well. 1mL of this solution contains 1.00mg of gold.
3.2.19 Gold standard solution: Pipette 50.00mL of gold standard stock solution (3.2.18)
into a 500mL volumetric flask. Add 10mL of aqua regia (3.2.15). Use water to dilute to
the scale. Mix well. 1mL of this solution contains 100μg of gold.
3.3 Instruments and equipment
3.3.1 Test gold crucible: The material is refractory clay. The volume is about 300mL or
ensure that the depth of placing the sample does not exceed 3/4 of the depth of the
crucible.
3.3.2 Magnesia ashtray: Cement (No. 425), magnesia (< 0.18mm) and water are mixed
evenly according to the mass ratio (15:85:10). Compress and mold on the ashtray. The
volume is not less than 5mL. It shall be used after drying in the shade for 3 months.
3.3.3 Balance: The resolution is not more than 0.01g.
3.3.4 Electric melting furnace: The maximum heating temperature is not lower than
1200℃.
3.3.5 Ash blowing electric furnace: The maximum heating temperature is not lower than
1000℃.
3.3.6 Flame atomic absorp...
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