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Gold close dissolving method

A container and powder technology, applied in the field of airtight dissolution, can solve the problem that it is difficult for gold to dissolve completely and completely, and achieve the effect of speeding up the dissolution time, shortening the detection time, and good stability.

Inactive Publication Date: 2010-12-29
HENAN ZHONGYUAN GOLD SMELTERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because gold concentrate generally contains a large amount of sulfide and silicate, the traditional wet method uses a single aqua regia to dissolve the gold sample to be tested, and it is difficult to completely and thoroughly dissolve the gold in the sample.

Method used

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  • Gold close dissolving method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A kind of airtight dissolving method of gold, comprises the following steps:

[0012] Add 10g of powder gold to be dissolved into the beaker, add water to moisten it, then add 40ml of aqua regia, wait until the red smoke of nitrogen dioxide is exhausted, add 2g of ammonium bifluoride, 8g of sodium chloride and 1g of potassium permanganate in sequence, and mix well , Seal the beaker and place it in a boiling water bath for 20 minutes.

Embodiment 2

[0014] A kind of airtight dissolving method of gold, comprises the following steps:

[0015] Add 30g of powdered gold to be dissolved into the beaker, add water to moisten it, then add 60ml of aqua regia, wait until the red smoke of nitrogen dioxide is exhausted, add 4g of ammonium bifluoride, 10g of sodium chloride and 2g of potassium permanganate in sequence, and mix well , Seal the beaker and place it in a boiling water bath for 40 minutes.

Embodiment 3

[0017] A kind of airtight dissolving method of gold, comprises the following steps:

[0018] Add 20g of powdered gold to be dissolved into the beaker, add water to moisten it, then add 50ml of aqua regia, wait until the red smoke of nitrogen dioxide is exhausted, add 3g of ammonium bifluoride, 9g of sodium chloride and 1.5g of potassium permanganate in sequence, and mix well Finally, seal the beaker and place it in a boiling water bath for 30 minutes.

[0019] When the conditions of other steps in the test process are the same and only the dissolution method is different (that is, the subsequent steps all adopt the conventional test method in the prior art: filtration→activated carbon adsorption→ashing→iodometric titration), the gold content results recorded can be seen in Table 1.

[0020] Table 1 Other test conditions are the same, only the gold content of the sample is measured when the dissolution method is different

[0021]

[0022] Note: The silicate content in the...

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Abstract

The invention relates to a gold close dissolving method. The method comprises the following steps: adding 10 to 30 grams of powder to be dissolved in a vessel; adding water for moisturizing; adding 40 to 60ml of chloronitric acid; adding 2 to 4 grams of ammonium bifluoride, 8 to 10 grams of sodium chloride and 1 to 2 grams of potassium permanganate in sequence after red smoke of oxygen dioxide is not produced; closing the vessel after uniformly mixing, and placing the mixture in a boiled water for 20-40min. The method has the advantages of same sample safety, accurate results, good repetition, simple and quick operation and low detecting cost.

Description

technical field [0001] The invention belongs to the technical field of precious metal treatment, and in particular relates to a gold closed dissolution method. Background technique [0002] At present, wet methods are commonly used in mining and dressing metallurgical enterprises to determine gold content, that is, sample dissolution→filtration→activated carbon adsorption→ashing→iodometric titration. The sample dissolution is a crucial step in the whole detection process. Because gold concentrate generally contains a large amount of sulfide and silicate, it is difficult to completely and thoroughly dissolve the gold in the sample by using a single aqua regia to dissolve the gold sample to be tested in the traditional wet method. Contents of the invention [0003] The purpose of the present invention is to provide a closed dissolution method with simple operation, short dissolution time and more complete gold dissolution. [0004] To achieve the above object, the present ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01F1/00G01N1/28G01N31/18
Inventor 薛光张厚杰刘成祥党宏庆
Owner HENAN ZHONGYUAN GOLD SMELTERY
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