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Decomposition method of gold ore sample

A gold ore and sample technology, applied in the field of precious metal analysis, can solve the problems of incomplete decomposition of samples with aqua regia and low results, and achieve the effects of simplified procedures, less volatilization of acid vapor, and avoiding the process of silicon removal

Inactive Publication Date: 2018-10-02
INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention provides a method for decomposing gold ore samples. The method is to quickly remove silicon, sulfur, carbon, organic matter, etc. by mixing and roasting solid chemical reagents and gold ore samples; The problem of incomplete decomposition of samples and low results

Method used

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  • Decomposition method of gold ore sample

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 1. Weigh 10g of quartz vein gold ore sample (GA1-Au-02) and 30g of ammonium bifluoride in a 50mL nickel crucible, mix well and place in a muffle furnace (furnace door slightly open), and heat up according to the set temperature program To 650 ℃, keep warm for 1h, take out and cool.

[0036] 2. Crush the agglomerated sample in the nickel crucible carefully with a glass rod, transfer it to a 250mL sample dissolving bottle, add a little water to moisten it; add 40mL 50% aqua regia (V / V), 4mL phosphoric acid (15mol / L) , Tighten the lid of the dissolving bottle and shake well. Put it in a closed water bath, dissolve for 1.5 hours, take it out and cool it, at this time the gold in the sample is completely decomposed.

[0037] 3. Add water to 200mL, enrich the gold with activated carbon pulp, ash, extract with 5% aqua regia (V / V), set the volume to 25mL, and measure it with a flame atomic absorption spectrophotometer. The measurement results are shown in Table 2.

Embodiment 2

[0039] Example 2 is based on the basis of Example 1, in that the gold ore sample selected in this example is quartz vein gold ore (GBW07299). The measurement results are shown in Table 2.

Embodiment 3

[0041] 1. Weigh 10g of skarn sample (WB-1a#) and 30g of ammonium bifluoride in a 50mL nickel crucible, mix well and place in a muffle furnace (furnace door slightly open), and heat up to 700°C according to the set temperature program , keep warm for 1.5h, take out and cool.

[0042] 2. Crush the agglomerated sample in the nickel crucible carefully with a glass rod, transfer it to a 250mL sample dissolving bottle, add a little water to moisten it; add 50mL 50% aqua regia (V / V), 6mL phosphoric acid (15mol / L) , Tighten the lid of the dissolving bottle and shake well. Put it in a closed water bath, dissolve for 1.5 hours, take it out and cool it, at this time the gold in the sample is completely decomposed.

[0043] 3. Add water to 200mL, enrich the gold with activated carbon pulp, ash, extract with 5% aqua regia (V / V), set the volume to 25mL, and measure it with a flame atomic absorption spectrophotometer. The measurement results are shown in Table 3.

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Abstract

The invention provides a decomposition method of a gold ore sample. According to the method, a solid chemical reagent and the gold ore sample are mixed in a crucible, then a mixture is calcined in a muffle furnace, and silicon and substances such as sulfur, carbon, organic matter and the like are removed rapidly; further, composite acid is adopted for closed decomposition, the problems of incomplete sample decomposition and lower results because of adoption of aqua regia are solved by mixed acid formed by hydrochloric acid, nitric acid and phosphoric acid, and accordingly, gold in the sample is effectively and completely decomposed. Capacity of decomposition of the method is comparable with that of a fire assaying method, the required reagents are conventional chemical reagents in a laboratory, and the method has the characteristics of being low in cost, rapid, efficient, safe, environmentally-friendly, economical and applicable.

Description

technical field [0001] The invention belongs to the technical field of precious metal analysis, in particular to a method for decomposing gold ore samples. Background technique [0002] Gold mostly exists as natural gold in nature and has good ductility. When processing ore samples, the crushing speed of gold lags behind that of gangue. At the same time, gold has a large specific gravity and easily sinks to the bottom of the sample, so it is difficult to obtain a representative uniform sample. [0003] To accurately determine gold in ore, it is necessary to increase the sampling volume to improve the representativeness of the sample and reduce the analysis error caused by unevenness. The operation instruction book "Rock and Mineral Analysis Fourth Edition" clearly states that for the analysis of gold-bearing samples, the sampling volume must be guaranteed to be above 10g. [0004] At present, the most commonly used decomposition methods that can meet the sampling volume ar...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/44
CPCG01N1/28G01N1/44
Inventor 邵坤李刚范建雄
Owner INST OF MULTIPURPOSE UTILIZATION OF MINERAL RESOURCES CHINESE ACAD OF GEOLOGICAL SCI
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