Method for producing metallic lead and zinc by using lead-zinc containing waste slag or lead-zinc monoxide mine

A lead-zinc oxide, metal lead technology, applied in the improvement of process efficiency, photography technology, instruments and other directions, can solve the problems of low product purity, high energy consumption, serious environmental pollution of lead dust, etc. The effect of low consumption and good environmental benefits

Active Publication Date: 2008-07-09
昆明同越科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high energy consumption, low product purity, and the lead dust produced in the process has serious environmental pollution.

Method used

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  • Method for producing metallic lead and zinc by using lead-zinc containing waste slag or lead-zinc monoxide mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] see figure 1 . Taking lead-zinc ash (lead-zinc waste residue) from a factory as raw material, its composition is shown in Table 1:

[0014] Table 1 The composition of lead and zinc ash in a factory

[0015] Element

[0016] First, immerse 500g of the above-mentioned lead-zinc ash into 5L of 5mol / L NaOH solution, the leaching temperature is 30°C, and stir for 200 minutes at a speed of 500 rpm, and the lead-zinc in the lead-zinc ash enters the solution. Then filter while hot to obtain filter residue and filtrate. The composition of the filtrate is shown in Table 2:

[0017] Table 2 Composition of lead-zinc ash alkali leaching solution

[0018] Element

[0019] After the filter residue is washed with NaOH solution and water, the washing water is returned to be used as a strong alkali leaching cycle, and the washing residue is landfilled. The filtrate is directly used for electrolysis of lead, using stainless steel as cathode and anode, at 20-30℃,...

Embodiment 2

[0021] Taking lead oxide ore as raw material, its composition is shown in Table 3:

[0022] Table 3 Composition of a certain lead-zinc oxide ore

[0023] Element

[0024] 240g of the above-mentioned lead-zinc oxide ore was pulverized to 0.1-1mm, then immersed in 6L 5mol / L NaOH solution, the leaching temperature was 90°C, and stirred for 100 minutes at a speed of 1000 rpm, and the lead and zinc in the ore powder entered the solution. Then filter while hot, and the filtrate composition is shown in Table 4:

[0025] Table 4 composition of lead-zinc oxide ore alkali leaching solution

[0026] Element

[0027] The filter residue was washed with NaOH solution and water and then landfilled. The filtrate is directly used for electrolysis of lead, using stainless steel as cathode and anode, at 30-50℃, the current density is 1000A / m 2 , the voltage is 1.8-2.0V, the electrolysis is carried out for 2h, and the crude lead with the purity of 98.5% is obtained on the...

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Abstract

The invention discloses a manufacturing method of metal lead and zinc through waste slag with lead and zinc or low-grade lead or zinc oxide, which comprises the following steps: grinding lead zinc slag or lead zinc oxide into 0.1-1mm; stirring and leaching through strong base solution under 10-100 deg.c for 30-1000min; filtering; draining filtrate; electrolyzing filtrate directly to generate lead with current density at 100-1000A / m2 under 30-100 deg.c for 1-5h; stopping electrolyzing when tank voltage is improved to 1.8-2.5V; producing rough lead with 97-99.9% lead on the cathode; pressing; obtaining electrolytic refined lead; electrolyzing residual electrolytic liquid with zinc under 10-100 deg.c at 2.5-3.5V with current density at 500-1500A / m2 for 1-10h; drying zinc on the cathode protected by inert gas; obtaining one-grade metal zinc powder; circulating residual electrolytic solution in the alkaline leaching course directly.

Description

technical field [0001] A method for producing metal lead and zinc from lead-zinc waste residue or lead-zinc oxide ore, relates to a method for producing metal lead and zinc from lead-zinc waste residue, and belongs to the field of non-ferrous metal recovery and solid waste recycling. technical background [0002] Lead and zinc are widely used. Lead is mainly used in lead-acid batteries, cable sheathing, machinery manufacturing and other fields. Metal zinc powder is mainly used in dry battery manufacturing, paint, metallurgy and other fields. At present, the raw material for lead production is galena with a lead content of more than 50%, which basically adopts the traditional lead smelting process of sintering and blasting, which produces a large amount of SO during the production process. 2 And lead dust, serious environmental pollution. The raw material for zinc production is sphalerite containing more than 40% of zinc. The acid method of roasting - acid leaching - impurit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/12C22B13/00C22B19/00C25C1/16C25C1/18
CPCY02P10/20
Inventor 赵由才郭翠香易天晟刘清张承龙
Owner 昆明同越科技开发有限公司
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