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A kind of recovery method of valuable metal in silver-zinc slag

A technology of valuable metals and recycling methods, applied in the direction of improving process efficiency, etc., can solve the problems of step-by-step separation of silver and zinc slag, complex process flow, high production cost, etc., and achieve simple and clear process, reasonable process configuration, and production low cost effect

Active Publication Date: 2019-07-19
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the leaching is carried out in a heated environment, and the valuable metals in the silver-zinc slag cannot be separated step by step, and the separation after the silver metal enters the slag phase is not complete
This process uses the traditional vacuum distillation method to process the silver-zinc shell, and then transfers to the traditional pyrometallurgy to recover valuable metals such as gold, silver, zinc, etc., which has the disadvantages of complicated process, high production cost, and metal recovery rate.

Method used

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  • A kind of recovery method of valuable metal in silver-zinc slag
  • A kind of recovery method of valuable metal in silver-zinc slag
  • A kind of recovery method of valuable metal in silver-zinc slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Process flow chart such as figure 1 As shown, the specific steps are as follows:

[0035] a) Vacuum distillation: take 1000Kg of silver-zinc slag, including Bi71.3%, Ag3.8%, Zn11.8%, Pb1.7%, and send it to a vacuum furnace for distillation. The vacuum degree is kept at 15Pa, at a temperature of 920°C Keep it warm for 2 hours to get rough silver and zinc-bismuth alloy. After the rough silver is oxidized and blown, the cast silver anode plate is sent to silver electrolysis.

[0036] b) Lead oxide sinking: HCl and H for zinc-bismuth alloy 2 o 2 The mixed solution is oxidized and leached, and the volume mass ratio of the mixed solution to the zinc-bismuth alloy is 4mL:1g; that is, 4mL of the mixed solution is added to 1g of silver-zinc slag, reacted at room temperature for 1.5h, and press filtration obtains filtrate 1 and filter residue 1, filter residue 1( Mainly lead chloride) returns to the lead system to extract lead.

[0037] c) Neutralization of sinking bismuth: a...

Embodiment 2

[0041] a) Vacuum distillation: take 1000Kg of silver-zinc slag, including Bi69.3%, Ag4.2%, Zn13.1%, Pb1.2%, and send it to a vacuum furnace for distillation. The vacuum degree is kept at 20Pa, at a temperature of 940°C Keep it warm for 2.5 hours to obtain crude silver and zinc-bismuth alloy. After the crude silver is oxidized and blown, the cast silver anode plate is sent to silver electrolysis.

[0042] b) Lead oxide sinking: HCl and H for zinc-bismuth alloy 2 o 2 The mixed solution is oxidized and leached, and the volume mass ratio of the mixed solution to the zinc-bismuth alloy is 5mL:1g; that is, 5mL of the mixed solution is added to 1g of silver-zinc slag, reacted at room temperature for 2h, and press-filtered to obtain filtrate 1 and filter residue 1, filter residue 1 (mainly for lead chloride) to return to the lead system to extract lead.

[0043] c) Neutralization of bismuth: add sodium hydroxide solution to filtrate 1 to adjust pH to 3.5, react at 70° C. for 1 hour ...

Embodiment 3

[0047] a) Vacuum distillation: take 1000Kg of silver-zinc slag, including Bi76.8%, Ag4.0%, Zn14.8%, Pb3.2%, and send it to a vacuum furnace for distillation. The vacuum degree is kept at 10Pa, at a temperature of 910°C Keep it warm for 1.5h to get rough silver and zinc-bismuth alloy, and cast silver anode plate to send silver electrolysis after oxidation blowing of crude silver.

[0048] b) Lead oxide sinking: HCl and H for zinc-bismuth alloy 2 o 2 The mixed solution is oxidized and leached, and the volume mass ratio of the mixed solution to the zinc-bismuth alloy is 6mL:1g; that is, 6mL of the mixed solution is added to 1g of silver-zinc slag, reacted at room temperature for 1h, and press-filtered to obtain filtrate 1 and filter residue 1, filter residue 1 (mainly for lead chloride) to return to the lead system to extract lead.

[0049] c) Neutralization of bismuth: add sodium hydroxide solution to filtrate 1 to adjust pH to 4, react at 60°C for 1.5 hours to hydrolyze bismu...

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PUM

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Abstract

The invention discloses a recovery method of valuable metal in silver-zinc slag. The recovery method comprises the steps of vacuum distillation, oxidation for lead precipitation, neutralization for bismuth precipitation, neutralization for zinc precipitation, and replacement for bismuth extraction. Oxidizing leaching and the neutralization for zinc precipitation are carried out at ordinary temperature, so that consumption of steam is reduced, and the operating efficiency is improved; and by adopting vacuum distillation and wet process combined treatment, compared with a traditional method, a treatment process is simple and clear, technical configuration is reasonable, metal separation is thorough, the recovery rate is higher and economic benefits are good.

Description

technical field [0001] The invention belongs to the field of nonferrous metal smelting, and in particular relates to a method for recovering valuable metals in silver-zinc slag. Background technique [0002] Silver-zinc shell is an intermediate product of adding zinc to remove silver when pyro-refining lead or bismuth. Since zinc can form a series of refractory compounds with gold, silver and other metals, these compounds are almost insoluble in bismuth liquid and have a lower density than bismuth. Therefore, metal zinc is added to the bismuth liquid, and copper, gold, and silver in the bismuth liquid form insoluble compounds with zinc, which float on the surface of the bismuth liquid, that is, silver-zinc slag, which is the raw material for comprehensive recovery of silver and bismuth. Silver-zinc slag contains a lot of silver and bismuth, generally containing 1-10% silver, and more than 50% bismuth. In addition, it contains some zinc, copper, lead and a small amount of gol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/04C22B3/10C22B3/44C22B3/46C22B11/00C22B19/30C22B19/20C22B30/06C22B13/00
CPCC22B3/10C22B3/44C22B3/46C22B7/001C22B7/007C22B7/04C22B11/044C22B13/045C22B19/22C22B19/30C22B30/06Y02P10/20
Inventor 粟明辉陈兰谢兆凤
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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