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Silver-zinc crust wet process comprehensive recovery method

A technology of silver-zinc shell and wet method, which is applied in the field of comprehensive recovery of silver-zinc shell by wet method, can solve the problems of affecting metal recovery rate, lack of smelting slag recovery instructions, and production cycle affecting enterprise capital backlog, etc., to achieve short process time, Strong production adaptability and simple process

Active Publication Date: 2016-10-12
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This invention patent adopts the traditional old method of vacuum distillation, and then transfers to fire smelting to recover gold and silver. The complexity of this process affects the metal recovery rate, and the long production cycle affects the backlog of funds of the enterprise. In addition, this invention patent focuses on the smelting of precious metals. A rough description of the comprehensive recovery system as a whole, without detailed comprehensive recovery instructions for the actual smelting slag produced by a certain enterprise

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  • Silver-zinc crust wet process comprehensive recovery method

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Embodiment 1

[0030] The flow chart of the production method of the comprehensive recovery of silver-zinc shell by wet method in this embodiment is as follows figure 1 As shown, the specific steps are as follows:

[0031] Take 2000g of silver-zinc shell and add 200g of calcium oxide for oxidative roasting. The oxidative roasting is divided into three stages. The first stage of roasting is roasting at a roasting temperature of 700°C for 2 hours, and then the second stage of roasting is carried out at a roasting temperature of 800°C. Roasting at low temperature for 2 hours, and finally the third stage of roasting, roasting at 1000°C for 1 hour, rolling continuously throughout the roasting process to make it evenly roasted; then crushing and mixing the roasted silver-zinc shells in a ball mill, 150 mesh sieve, now the element composition content in the silver-zinc shell is (fully roasted and ball milled): lead: 4.14%, silver: 10.49%, bismuth: 20.39%, zinc: 25.67, particle size: 150 mesh.

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Embodiment 2

[0039] The flow chart of the production method of the comprehensive recovery of silver-zinc shell by wet method in this embodiment is as follows figure 1 As shown, the specific steps are as follows:

[0040] Take 2000g of silver-zinc shell and add 60g of calcium oxide for oxidative roasting. The oxidative roasting is divided into three stages. The first stage of roasting is roasting at a roasting temperature of 400°C for 6 hours, and then the second stage of roasting is carried out at a roasting temperature of 700°C. Roasting at low temperature for 4 hours, and finally the third stage of roasting, roasting at 800°C for 3 hours, rolling continuously throughout the roasting process to make it evenly roasted; then crushing and mixing the roasted silver-zinc shells in a ball mill, 200 mesh sieve, at this time the elemental composition content in the silver-zinc shell is (fully roasted and ball milled): lead: 10.32%, silver: 15.46%, bismuth: 25.49%, zinc: 30.16, particle size: 200 ...

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Abstract

The invention discloses a silver-zinc crust wet process comprehensive recovery method which is characterized in that that silver-zinc crusts are subjected to thorough roasting and ball milling sieving; then through an acid leaching condition, an acid extract and acid leaching residues are obtained; after the acid leaching residues are leached by sodium sulfite, lead residues and an extract are obtained; the lead residues can return to a pyrogenic process smelting system, the extract is purified and then is reduced by formaldehyde, and crude silver is finally obtained after casting; the acid extract can be replaced by zinc powder and sponge bismuth is obtained; liquid after replacement is purified and then is subjected to evaporative crystallization, and zinc chloride is obtained; and direct recovery rates of silver, bismuth and zinc respectively reach above 95.7%, 94.1% and 88.9%. The silver-zinc crust wet process comprehensive recovery method is applicable to recovery of valuable metals, such as silver, bismuth and zinc, from the silver-zinc crusts rich in lead, silver, bismuth and zinc; the lead residues can return the pyrogenic process smelting system; the direct recovery rates are high; separation is thorough; and rapid recovery of valuable metals, especially silver, of the pyrogenic process smelting system is facilitated more.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal hydrometallurgy and secondary resource recovery, in particular to a method for comprehensive recovery of silver-zinc shells by wet method. Background technique [0002] Silver-zinc shells are the product of adding zinc to remove silver during the refining process of some non-ferrous metals. At present, most of the recovery methods of silver-zinc shells at home and abroad are recovered by traditional vacuum distillation methods. However, this method has problems such as too long process flow, long recovery time, and low recovery rate, and most of this method requires pyrometallurgy for further recovery, which greatly reduces recovery efficiency. Therefore, the rapid comprehensive recovery of valuable metals in silver-zinc shells by wet method, that is, the comprehensive recovery of valuable metals such as silver, bismuth, zinc, lead, etc., so that the precious metal smelting slag can be r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B30/06C22B19/30C22B11/00C22B13/00B22F9/24
CPCB22F9/24C22B7/007C22B11/042C22B13/045C22B19/30C22B30/06Y02P10/20
Inventor 覃小龙谭霖谢兆凤杨跃新
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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