Wet process for lead-silver residues

A technology of wet treatment and lead-silver slag, applied in the direction of improving process efficiency, etc., can solve problems such as low metal direct recovery rate, environmental secondary pollution, equipment corrosion, etc., and achieve high silver direct recovery rate and high comprehensive recovery degree , the effect of short processing time

Active Publication Date: 2011-04-27
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this pyroprocessing method, due to the presence of a large number of chloride ions in the lead-silver slag, severely corrodes the equipment, causing secondary pollution to the environment, and the metal direct recovery rate is low

Method used

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  • Wet process for lead-silver residues
  • Wet process for lead-silver residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of lead-silver slag wet treatment process is to carry out according to the following steps:

[0020] a Take 5L industrial grade concentrated hydrochloric acid and dissolve it in 300L water to make dilute hydrochloric acid; -1 , Bi 2% lead-silver slag crushed, ball milled to a particle size below 0.15mm, 100kg was leached with the above-mentioned dilute hydrochloric acid solution, and filtered; -1 After stirring for 90min, filter to obtain lead containing 71.4%, silver Ag18447g t -1 , Bismuth 0.09% leaching residue 85kg;

[0021] b) The obtained leaching liquid in step a is heated to 90° C. while stirring, adding industrial grade sodium hydroxide, adjusting the pH to about 1.5, continuing to stir for 30 minutes and then filtering to obtain bismuth oxychloride. The hydrolyzed liquid is treated and returned to step a for leaching and utilization;

[0022] c takes by weighing 93kg technical grade sodium carbonate and is dissolved in 255L water, is heated up to 85 ℃...

Embodiment 2

[0024] A kind of lead-silver slag wet treatment process is to carry out according to the following steps:

[0025] a Take 15L industrial grade concentrated hydrochloric acid and dissolve it in 900L water to make dilute hydrochloric acid; -1 , Bi 3% lead-silver slag crushed, ball milled to a particle size below 0.15mm, take 300kg and leaching with the above-mentioned dilute hydrochloric acid solution, and filter; -1 After stirring for 90min, filter to obtain lead containing 65.3%, silver Ag7594g t -1 , bismuth 0.09% leaching residue 270kg;

[0026] b) The obtained leaching solution in step a is heated to 80°C while stirring, adding industrial grade sodium hydroxide, adjusting the pH to about 2.5, continuing to stir for 30 minutes and then filtering to obtain bismuth oxychloride; the hydrolyzed solution is returned to step a for leaching and utilization;

[0027] c takes by weighing 270kg industrial grade sodium carbonate and dissolves it in 810L water, heats up to 80 ℃, adds ...

Embodiment 3

[0029] A kind of lead-silver slag wet treatment process is to carry out according to the following steps:

[0030] a Take 15L industrial grade concentrated hydrochloric acid and dissolve it in 900L water to make dilute hydrochloric acid; -1 , Bi 5% lead-silver slag crushed, ball milled to a particle size below 0.15mm, take 300kg and leaching with the above-mentioned dilute hydrochloric acid solution, and filter; -1 After stirring for 30min, filter, at room temperature with 300r min -1 After stirring for 90min, filter to obtain lead containing 62.2%, silver Ag8894g t -1 , bismuth 0.07% leach residue 263kg;

[0031] b) The temperature of the obtained leaching solution in step a is raised to 50°C while stirring, adding industrial grade sodium hydroxide, adjusting the pH to about 2, continuing to stir for 30 min, and then filtering to obtain bismuth oxychloride. ;

[0032] c takes by weighing 270kg technical grade sodium carbonate and dissolves it in 810L water, is warming up ...

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Abstract

The invention discloses a wet process for lead-silver residues, which comprises the following major steps: crushing lead-silver residues, carrying out ball milling, leaching with dilute hydrochloric acid, adding sodium hydroxide to the leached solution to hydrolyze so as to generate bismuth oxychloride as a precipitate, transferring the bismuth oxychloride to a bismuth smelting system, and treating the hydrolysis waste solution for cyclic use; and transforming the leached residues with sodium carbonate, then recycling the mother solution, dissolving the transformed residues in silicofluoric acid, filtering the residues to obtain silver-enriched residues, transferring the silver-enriched residues to a silver smelting system, and using the obtained lead silicofluoride solution for preparing a lead electrolyte. The invention has the advantages of simple flow and no environmental pollution; by preparing lead in lead-silver residues into lead silicofluoride used as the electrolyte, the input amount of yellow lead in the lead electrolysis system is reduced; by dissolving lead in silicofluoric acid, silver-enriched residues with a silver content up to more than 60% can be directly obtained, and the direct silver yield is high; the overall system realizes the cyclic use of the solution, and the comprehensive recycling degree is high; and the treatment time is short, and the comprehensive cost is low.

Description

technical field [0001] The invention relates to the technical field of lead and silver recovery, in particular to a lead and silver slag wet treatment process. Background technique [0002] The smelter uses the bismuth slag produced by silver oxidation and refining as raw material to produce refined bismuth. In the process of leaching the bismuth slag with hydrochloric acid, a kind of bismuth containing 55-62% of lead and 6900-16000g·t of silver will be produced. -1 The leaching slag is customarily called lead-silver slag. In addition to a large amount of lead and silver, the slag also contains valuable metals such as bismuth and copper, which are of great value for comprehensive recycling. However, there is no better treatment method for this kind of slag that can be used for reference. Ordinary smelters have to stack and store them, which often causes environmental pollution and occupies the effective space of the plant. What's more, some enterprises sell directly as le...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/06C22B11/00C22B15/00C22B30/06
CPCY02P10/20
Inventor 谢兆凤张圣南季勇马辉曹永贵曹永德
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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