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Secondary refining process for silver

An oxidative refining and secondary oxidation technology is applied in the field of precious metal smelting, which can solve the problems of low silver content in crude silver and low first-grade product rate of silver ingots, and achieve the effect of saving, reducing sodium hydroxide consumption and reducing requirements.

Active Publication Date: 2012-03-07
CHENZHOU CITY JINGUI SILVER IND CO LTD
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Problems solved by technology

[0010] The technical problem to be solved by the present invention is to propose a secondary oxidation and refining process for silver, which can strengthen the oxidation and refining process, aiming at the defects that the silver content of crude silver is not high and the first-grade silver ingot rate is low in the existing silver smelting process technology. Make the final coarse silver grade reach more than 98.5%, and the first-grade silver ingot rate reach 100%

Method used

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  • Secondary refining process for silver
  • Secondary refining process for silver
  • Secondary refining process for silver

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Embodiment Construction

[0052] The present invention will be described in detail below with specific embodiments in conjunction with the accompanying drawings.

[0053] attached figure 1 It shows a secondary oxidation refining process diagram of silver, which is to add a blast after the small converter oxidation refining process of precious lead, and add lead oxidation refining process; this process is realized in a gray blown silver refining furnace, and its production capacity It is 150kg of crude silver per pool; the specific process is as follows:

[0054] ①Primary oxidation refining crude silver impurity removal process

[0055] 1a Stepping on the pool: Spread a layer of dry cement evenly on the bottom of the curved surface refining pool, and the amount of cement is one bag per pool;

[0056] 1b Add primary oxidized and refined crude silver: uniformly add primary oxidized and refined crude silver into the refining pool of the ashblowing silver refining furnace, the grade of primary oxidized an...

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Abstract

The invention relates to a secondary refining process for silver, which belongs to the technical field of precious metal melting. A process of blasting air and adding lead for oxidizing refining is added after the process of oxidizing refining in a small converter for precious lead, wherein the process is implemented in a cupellation silver refining furnace of which the production capacity is 150kg dore silver per pool at one time. The secondary refining process for the silver can enhance the process of oxidizing refining, so that the final dore silver grade reaches over 98.5 percent and thefirst-grade product ratio of silver ingots is up to 100 percent.

Description

technical field [0001] The invention relates to a silver secondary oxidation refining process, which belongs to the technical field of precious metal smelting. Background technique [0002] The silver smelting process method in the prior art is: precious lead → small converter oxidation refining → crude silver → electrolytic refining → precipitation of silver powder → casting mold → silver ingot. The small converter oxidation refining step is carried out in the oxidation refining converter, and it is also called oxidation refining due to the formation of an oxidizing atmosphere by a large amount of air blast. According to the different affinity between each metal and oxygen, the lead in the noble lead raw material is used to be oxidized, and the lead is first oxidized as an oxidant. During the oxidation process, antimony, lead, bismuth, copper, etc. enter the smoke and slag in the form of oxides. Tellurium is oxidized to tellurium dioxide, part of which forms sodium telluri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/02
Inventor 张圣南陈朴曹永贵曹永德
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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