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Method for enriching lead from low-grade lead slag

A low-grade, lead slag technology, applied in the direction of improving process efficiency, can solve the problems of complex composition, high technical difficulty and high energy consumption

Active Publication Date: 2017-12-08
杨云婷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, for the lead-containing materials that are difficult to beneficiated and have complex components and are not suitable for pyroprocessing, the direct pyrolysis recovery causes air pollution, high energy consumption, and relatively large occupational injuries. Wet recovery can avoid the above problems, but the technical difficulty is great.

Method used

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  • Method for enriching lead from low-grade lead slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment example 1

[0020] Lead sulfate slag contains Pb 17.5%, Zn 8%, Fe 3.7%, Mn 0.2%, Mg 0.38%, S 10%.

[0021] 1. Add lead sulfate slag to the liquid after calcium chloride washing at a liquid-solid ratio of 5:1, heat to 40-50°C, stir for 30 minutes, and filter to obtain the washing liquid and washing residue. The washing liquid contains Pb4 2～ 10g / L, the slag contains 20% Pb.

[0022] 2. Raise the temperature of the lotion to 70°C, add lime to adjust the pH>12, react for 30 minutes, and filter to obtain zinc-calcium-magnesium slag and dezincified calcium-magnesium solution. Zinc-calcium-magnesium slag contains Pb<0.1%, Zn 12%, Fe 2.4%, Mn 2.6%, Mg 2.6%, and after dezincification calcium-magnesium solution contains Pb<150mg / L, Zn<200mg / L, Fe<50mg / L , Mn<50mg / L, Mg 200mg / L, Cl 17g / L.

[0023] 3. Add the washed slag to the acid-adjusted solution (Pb 140mg / L, Zn 140mg / L, Ca 10g / L, Cl200g / L) at a liquid-solid ratio of 5:1, raise the temperature to 70-80°C, stir for 1 hour, and control The pH a...

Embodiment example 2

[0028] Lead sulfate slag contains 27% of Pb, 10.9% of Zn, 2.8% of Fe, 0.3% of Mn, 0.38% of Mg and 11% of S.

[0029] 1. Add lead sulfate slag to the liquid after calcium chloride washing at a liquid-solid ratio of 5:1, heat to 50-60°C, stir for 30 minutes, and filter to obtain the washing liquid and washing residue. The washing liquid contains Pb 179mg / L, Zn 3.9 g / L, Fe 0.8g / L, Mn 1.56g / L, Mg 0.62g / L, Cl3.8g / L, SO 4 2～ 11g / L, the slag contains 34% Pb.

[0030] 2. Raise the temperature of the lotion to 65°C, add lime to adjust the pH to 13-14, react for 30 minutes, and filter to obtain zinc-calcium-magnesium slag and dezincified calcium-magnesium liquor. Zinc-calcium-magnesium slag contains Pb<0.1%, Zn 16.5%, Fe 2.4%, Mn 2.6%, Mg 2.6%, and after dezincification calcium-magnesium solution contains Pb<50mg / L, Zn<50mg / L, Fe<50mg / L , Mn<50mg / L, Mg 200mg / L, Cl 25g / L.

[0031] 3. Add the washed slag to the acid-adjusted solution (Pb 500mg / L, Zn 300mg / L, Ca 13.5g / L, Cl210g / L) at a...

Embodiment example 3

[0036] Lead slag contains Pb 10%, Zn 13%, Fe 5%, Mn 0.8%, Mg 0.4%, S 12%.

[0037] 1. Add low-grade lead slag to the liquid after calcium chloride washing at a liquid-solid ratio of 5:1, heat to 60°C, stir for 30 minutes, and filter to obtain the washing liquid and washing residue. The washing liquid contains 200mg / L of Pb and 20g / L of Zn L, Fe 5g / L, Mn 1.3g / L, Mg 0.62g / L, Cl 3.8g / L, SO 4 2～ 13g / L, the washing residue contains 34% Pb.

[0038] 2. Raise the temperature of the lotion to 65°C, add lime to adjust the pH to 13-14, react for 30 minutes, and filter to obtain zinc-calcium-magnesium slag and dezincified calcium-magnesium liquor. Zinc-calcium-magnesium slag contains Pb<0.1%, Zn 16.5%, Fe 2.4%, Mn 2.6%, Mg 2.6%, and after dezincification calcium-magnesium solution contains Pb<50mg / L, Zn<50mg / L, Fe<50mg / L , Mn<50mg / L, Mg 200mg / L, Cl 25g / L.

[0039] 3. Add the washed residue to the acid-adjusted solution (Pb 100mg / L, Zn 100mg / L, Ca 8.1g / L, Cl180g / L) at a liquid-solid r...

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Abstract

The invention discloses a method for enriching lead from low-grade lead slag. The method comprises following steps: firstly, low-grade lead slag is added into calcium chloride washing after-liquid, and after filtering, washing liquid and washing slag are obtained; secondly, the washing liquid is subject to temperature rise to adjust PH, after the reaction and filter, zinc, calcium and magnesium slag and zinc, calcium and magnesium removal after-liquid are obtained; thirdly, the washing slag is added into acid adjusting after-liquid, temperature rising stirring is carried out, and after filter, leaching liquid and leaching slag are obtained; fourthly, leaching liquid is subject to temperature rise, stirring is carried out, the PH value is adjusted, lead removal after-liquid and lead slag are obtained, the lead removal after-liquid and a calcium chloride solution jointly enter an acid adjusting pond, then, the PH is adjusted, and acid adjusting after-liquid is made, and returns to the third step to be used; fifthly, according to the liquid-solid ratio being 5:1, calcium and magnesium removal after-liquid and a small amount of water are added into the lead slag obtained in the fourth step, stirring and filtering are carried out, high-lead slag and calcium chloride washing after-liquid are obtained, the PH of the calcium chloride washing after-liquid is adjusted, and the calcium chloride washing after-liquid returns to the first step to be used. According to the method, the enrichment efficiency is extremely high, the lead recycling rate is high, the lead is enriched, the content is improved, the recycling methods are many, the process difficulty is low, and the development space is large.

Description

technical field [0001] The invention relates to the field of zinc metallurgy recovery, more specifically, a method for enriching lead from low-grade lead slag. Background technique [0002] Lead sulfate slag is the waste residue discharged during the production and use of zinc metallurgy and zinc products. It is not only a harmful substance that pollutes the environment, but also a secondary resource for extracting valuable components. Therefore, it must be comprehensively treated to achieve "open source and reduce expenditure" and prevent pollution. the goal of. At present, for lead-containing materials that are difficult to beneficiate and complex in composition, and are not suitable for pyroprocessing, the direct pyrolysis recovery causes air pollution, high energy consumption, and greater occupational injury. Wet recovery can avoid the above problems, but the technology is difficult. Contents of the invention [0003] In order to make up for the above deficiencies, th...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B13/00
CPCC22B7/007C22B13/045Y02P10/20
Inventor 王群洪斌杨桂芬赵阔王辉张怡彭锐杨龙
Owner 杨云婷
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