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Method for increasing quality of cathode silver power

A quality, electric silver technology, applied in non-ferrous metallurgy, metallurgy and chemical industry, can solve the problem of electric silver powder impurity copper exceeding the standard, and achieve the effect of low production cost, low operation intensity and simple equipment

Inactive Publication Date: 2010-05-05
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a method for improving the quality of electric silver powder, so as to solve the problem that the impurity copper in electric silver powder exceeds the standard

Method used

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  • Method for increasing quality of cathode silver power

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Effect test

Embodiment 1

[0049] In the production of silver electrolytic refining, in the later stage of silver electrolytic production, the production technical conditions are mainly to control the composition of the electrolyte at Ag: 90-120g / l, HNO 3 : 8-10g / l, Cu: <35--60g / l, when the copper content in the electrolyte is greater than 30g / l, the Cu content in the precipitated electrosilver powder will exceed 0.0034%, and the silver powder produced under the above conditions is 20g 1 / l of dilute nitric acid is dissolved and soaked, and the solid-to-liquid ratio of silver powder to dilute nitric acid is 1: 1.2 (volume ratio), the soaking temperature is 60°C, the soaking time is 4 hours, and the washing temperature is 80°C.

Embodiment 2

[0051] Production technical condition is the same as embodiment 1, and the silver powder of production adopts the dilute nitric acid dissolving soak of 20g / l, immersion washing, and silver powder and dilute nitric acid solid-liquid ratio are 1: 1 (volume ratio), 40 ℃ of soaking temperatures, soaking time 2 hours, The washing temperature is 90°C.

Embodiment 3

[0053] Production technical condition is with embodiment 1, and the silver powder of production adopts the dilute nitric acid dissolving of 24g / l to soak, soak, and silver powder and dilute nitric acid solid-liquid ratio are 1: 1.2 (volume ratio), immersion temperature 50 ℃, soaking time 2 hours, The washing temperature is 85°C.

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Abstract

The invention discloses a method for increasing quality of cathode silver power, aiming to solve the problem that the copper impurity in the cathode silver power exceeds standard. The method comprises the following steps: preparing cathode silver power by controlling the compositions of electrolyte to comprise 90-120g / l of Ag, 8-10g / l of HNO3 and less than 35-60g / l of Cu, and using 20-28g / l of dilute nitric acid to dissolve, soak and rinse the cathode silver power when the copper content in the electrolyte is more than 35g / l, wherein the soaking temperature is 40-50 DEG C, the soaking time is 2h, and the rinsing temperature is 80-90 DEG C. By using the method of the invention, the cost of the 1# cathode silver is reduced and the mass of the product silver ingot is increased. The method has the advantages of low operating intensity, simple equipment, low production cost, capability of not changing the original processing equipment, and the like.

Description

technical field [0001] The invention relates to nonferrous metallurgy and metallurgical chemical industries, in particular to a method for improving the production quality of silver powder. Background technique [0002] At present, in the domestic silver refining and electrolytic production, improving the quality of electrolytic silver powder is mainly to control the content of impurity copper, lead, bismuth and other metals. The method is: 1. Reduce the copper content of the anode alloy plate; 2. Continuously replace a large number of new electrolytic liquid. From the research of the above two methods, the following problems exist in production practice; [0003] 1) When the refined alloy plate is Ag+Au≥97%, continuing to reduce the amount of copper will prolong the refining cycle and increase energy consumption. From the practice of fire refining, when the copper in the gold-silver alloy is less than 2%, if If the impurity copper is reduced by 0.2%, the direct recovery r...

Claims

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Application Information

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IPC IPC(8): C25C5/02C25C1/20
Inventor 马志玫王银祥冯治兵郑锦汇贾东升
Owner BAIYIN NONFERROUS GROUP
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