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Technique for purifying and enriching Au and Ag from noble metal alloy

A technology for purifying and enriching precious metals, which is applied in the directions of non-metallic elements, improvement of process efficiency, selenium/tellurium compounds, etc., can solve the problems of increased production cost and low direct yield of gold and silver, and achieves high direct yield and separation. Good effect, the effect of reducing production cost

Inactive Publication Date: 2019-05-31
郴州雄风环保科技有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0004] 1) After the precious metal alloy is oxidized and refined by the silver separation furnace, the refining slag produced needs to be reduced and smelted again to produce the alloy, which increases the production cost;
[0005] 2) The direct recovery rate of gold and silver is low, about 92.5-93%

Method used

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  • Technique for purifying and enriching Au and Ag from noble metal alloy
  • Technique for purifying and enriching Au and Ag from noble metal alloy
  • Technique for purifying and enriching Au and Ag from noble metal alloy

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the examples, but the present invention is not limited in any way, and any transformation made based on the teaching of the present invention falls within the protection scope of the present invention.

[0029] Reference attached figure 2 A precious metal alloy purification and enrichment gold and silver process, oxidation refining process:

[0030] The crude gold-silver alloy with a content of 45-55% obtained after vacuum furnace separation is placed in the hearth, and the temperature is controlled at 950°C-1100°C for oxidation and refining. At this time, the molten lead contacts with the oxygen in the air to become lead oxide. Due to the effect of surface tension, most of the PbO is absorbed by the porous hearth, and a small part is volatilized, and the gold and silver are not oxidized, and remain in the hearth in granular form. According to metallurgy, the oxidation smelting process higher th...

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Abstract

The invention relates to a technique for purifying and enriching Au and Ag from noble metal alloy. The technique for purifying and enriching Au and Ag from the noble metal alloy comprises procedures of reduction smelting of anode mud containing Pb, Bi and Sn, separation of Au-Ag alloy in a vacuum furnace, and impurity removal in an oxidation refining furnace, through which the Au-Ag alloy with relatively high purity is obtained, and the direct yield and recovery rate of Au and Ag is improved to 97.5-99%. The technique for purifying and enriching Au and Ag from the noble metal alloy is simple and convenient, and the production cost can be reduced, so that an environment-friendly and safe effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy smelting, and in particular relates to a process for purifying and enriching gold and silver of precious metal alloys. Background technique [0002] The alloys containing precious metals obtained after enrichment, reduction, smelting and smelting of gold and silver-containing materials such as anode slime are called precious metal alloys, and their components vary depending on the source of the materials. The common ones are noble lead alloy, noble bismuth alloy, noble tin alloy, etc., because lead is the best collector for precious metals. Therefore, in the case of low lead content, lead is added to capture precious metals. Therefore, lead and silver are the main components of noble lead, and the content of other impurity metals varies with the source of the material. The gold content also varies with the material. The treatment of precious lead usually adopts pyro-refining to pu...

Claims

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Application Information

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IPC IPC(8): C22B7/00C01B19/00C22B11/02C22B13/02C22B15/00C22B23/02C22B25/02C22B25/06C22B30/02C22B30/04C22B30/06
CPCY02P10/20
Inventor 雷日华彭志平任文生许化龙邓永喜
Owner 郴州雄风环保科技有限公司
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