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Process for recovering silver and lead sulfate from slag

A lead sulfate and process technology, applied in the direction of improving process efficiency, can solve the problems of waste of resources, low service life of anode plates, increased energy consumption, etc., to meet the needs and realize the effect of productization

Active Publication Date: 2012-10-17
巴彦淖尔紫金有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the existing zinc hydrometallurgy industry, most of the lead and silver dross are sold at low prices, and some of them are added to the anode plate production process, the ratio of lead, silver and other auxiliary materials is changed, resulting in a low service life of the anode plate and poor electrical conductivity. A series of problems, such as poor quality, have affected the electrolysis efficiency and the quality of cathode zinc. Therefore, when used in lead smelting furnaces in lead smelting enterprises, it will cause waste of resources, increase energy consumption, etc., and there is no direct productization related process

Method used

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  • Process for recovering silver and lead sulfate from slag

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Embodiment 1

[0054] A kind of technology that utilizes the slag of making anode plate to recover silver and lead sulfate, its concrete steps comprise:

[0055] 1) Nitric acid leaching: Pump the liquid after preparing lead sinking into the leaching tank for about 8-10m 3 After starting the stirring, the amount of slag added to each tank is about 700-800kg, and a certain amount of nitric acid is added. After reacting at a temperature of 70-80°C for 10-12h, the end point pH=3.5-4. filter, the filter residue is returned to the filter press to continue leaching, and the liquid is poured into the immersion silver reaction tank for immersion silver. The principle of nitric acid leaching is as follows:

[0056] 3Ag+4HNO 3 (dilute) = 3Ag NO 3 +NO↑+2H 2 o

[0057] 3Pb+8HNO 3 (dilute)=3Pb(NO 3 ) 2 +2NO↑+4H 2 o

[0058] 2) Immersion silver: add dilute hydrochloric acid to the nitric acid leaching solution, and the amount of hydrochloric acid added is 1.5 times the theoretical amount, so that si...

Embodiment 2

[0074] A process for recovering silver and lead sulfate from slag for making anode plates, the process steps specifically comprising:

[0075] 1) nitric acid leaching,

[0076] Leaching conditions: temperature 75°C, liquid-solid ratio 11:1, reaction time 11 hours, end point PH=4.0, 760kg of slag per tank;

[0077] 2) Immersion silver: adding dilute hydrochloric acid to the nitric acid leaching solution to precipitate silver ions in the form of silver chloride;

[0078] Immersion silver conditions: Add 1.2 times the theoretical amount of hydrochloric acid at the temperature of the reaction solution, and after 0.5 hours of reaction, heat the reaction solution to above 95°C and filter the silver chloride particles;

[0079] 3) lead sinking: add sulfuric acid to the solution after sinking silver, and lead is precipitated in the form of lead sulfate;

[0080] Lead sinking conditions: at natural temperature, add continuous sulfuric acid until satisfactory white precipitate is form...

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Abstract

The invention discloses a process for recovering silver and lead sulfate from slag. The process includes the following steps: 1) nitric acid leaching; 2) silver precipitating; 3) lead precipitating; 4) washing; 5) sodium thiosulfate leaching; 6) zinc powder replacement; 7) pickling; and 8 ) smelting and ingot casting. The present invention efficiently recovers silver from lead silver dross, realizes productization of silver material, and at the same time meets requirements on lead sulfate by the production.

Description

technical field [0001] The present invention relates to a process for recovering silver and lead sulfate from furnace slag, and more specifically relates to a waste anode plate produced by a zinc hydrometallurgy system. Process for recovering silver and lead sulfate. Background technique [0002] With the vigorous advancement of the industrialization process, the demand for non-ferrous metal products has increased significantly, and the output of non-ferrous metals has also increased year by year. Correspondingly, it is necessary to vigorously supply the mineral raw materials required for smelting. However, modern industry has been developed for hundreds of years, and mineral resources have been consumed to a certain extent. The increase in total demand year by year is contradictory to the limitation of supply and demand resources and the decreasing law of total supply and demand resources. It is impossible to completely resolve this contradiction. Possibly, the only way to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B11/00
CPCY02P10/20
Inventor 孙明生杜敏沙涛
Owner 巴彦淖尔紫金有色金属有限公司
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