Beneficiation method for recovering zinc, lead and silver from zinc leaching residue

A beneficiation method and zinc leaching slag technology are applied in the field of recovering lead and silver from zinc leaching slag, and in the field of zinc, which can solve the problems of inability to recover lead and silver, and achieve low production costs, eliminate potential safety hazards, and reduce equipment costs. The effect of less investment

Active Publication Date: 2011-02-16
HUNAN HUAQI RESOURCES ENVIRONMENT SCI & TECH DEV CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a kind of beneficiation method of recovering zinc, lead and silver from zinc leaching slag with flotation as the main method, to overcome the various problems brought about by traditional rotary kiln volatilization and other pyrotechnics for zinc leaching slag. In order to make up for the disadvantages of the all-wet process, which can only recover water-soluble zinc, but not lead and silver, and to make up for the defect that the domestic leaching slag flotation process only recovers silver, and does not recover lead and zinc by flotation, and is different from the literature "Lead Alum Flotation: Research on Recovering Lead from Zinc Leach Slag" needs desliming before flotation. The present invention does not need desliming to carry out flotation on zinc leaching slag, and obtains an ideal comprehensive recovery of lead, zinc, and silver that exceeds literature reports. technical indicators

Method used

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  • Beneficiation method for recovering zinc, lead and silver from zinc leaching residue

Examples

Experimental program
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Effect test

example 1

[0088] Zinc leaching slag contains 5.1% lead, 4.8% zinc and 125g / t silver.

[0089] Weigh 1000 grams of the slag, add 500 ml of water, grind the ore in a ball mill for 2 minutes, add water to the ground pulp to make a pulp with a solid concentration of about 20%, add sulfuric acid solution to the pulp, stir for 10 minutes, and leaching Endpoint pH = 0.5. Then the pulp was vacuum filtered to obtain 3750 ml of leachate containing 6.7 g / l of zinc and a zinc leaching rate of 52.34%. 865 grams of leaching residue was obtained, containing 5.9% lead and 145g / t silver.

[0090] Add milk of lime to the leaching solution, adjust the pH of the slurry to 4.0, obtain 87 grams of gypsum slag after solid-liquid separation, containing 0.85% zinc, and the loss rate of zinc in the gypsum slag from the leachate is 2.94%. Add milk of lime to the solution of pH=4.0, adjust the pH of the pulp to 8.5, and obtain 124 grams of precipitated residue after solid-liquid separation again, containing 19.3...

example 2

[0096] Ore sample is identical with example 1, except that following steps are different from example 1, all the other steps are all the same as example 1. Add sulfuric acid solution in the washing and zinc dipping stage, stir for 30 minutes, and the pH of the leaching end point is 1.4. After solid-liquid separation, 3820ml of leachate is obtained, containing 6.1g / l of zinc, and the zinc leaching rate is 48.55%. 877g of leaching residue was obtained, containing 5.8% lead and 143g / t silver.

[0097] Add milk of lime to the 3820ml leachate to adjust the pH of the slurry to 5.0. After solid-liquid separation, 89 grams of gypsum slag is obtained, containing 0.82% zinc. The loss rate of zinc in the gypsum slag from the leachate is 3.13%. Add sodium hydroxide solution to the solution at pH=5.0, adjust the pH of the pulp to 9.0, and obtain 54.6 grams of precipitated residue after solid-liquid separation again, containing 40.64% zinc, the solution contains 0.1g / l zinc, and the zinc lo...

example 3

[0100] Ore sample is identical with example 1, except that following steps are different from example 1, all the other steps are all the same as example 1. In the leaching stage, sulfuric acid solution was added and stirred for 50 minutes. The pH of the leaching end point was 3.0. After solid-liquid separation, 3780ml of leachate was obtained, containing 5.9g / l of zinc, and the zinc leaching rate was 46.46%. 892 grams of leaching residue was obtained, containing 5.7% lead and 140g / t silver.

[0101] Add milk of lime to the 3780ml leaching solution to adjust the pH of the slurry to 5.8. After solid-liquid separation, 32 grams of gypsum slag are obtained, containing 1.5% zinc. The loss rate of zinc in the gypsum slag is 2.15%. In the solution of pH=5.8, add concentration again and be 30% sodium sulfide solution 110ml, obtain precipitation slag No. 1 zinc concentrate after solid-liquid separation again, weigh 41.6 grams, contain zinc 51.52%, solution contains zinc 0.1g / l, The zi...

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Abstract

The invention discloses a beneficiation method for recovering zinc, lead and silver from a zinc leaching residue. The method basically comprises the following steps of: recovering water-soluble zinc by a washing, zinc leaching and precipitating method to obtain a zinc concentrate; and recovering lead and silver to obtain a lead-silver concentrate by a disperse, size mixing, surface modifying and floating method. When the zinc content in the precipitate obtained by the washing, zinc leaching and precipitating method is lower, selective floating and enriching are carried out on the precipitate to obtain the zinc concentrate; and selective size mixing and floating are carried out on the leaching residue to recover indissoluble zinc in the leaching residue and then the indissoluble zinc is sent to a lead and silver recovery system. The method has the advantages that the process is simple, and required equipment investment is less; the production cost is low to ensure that an economical treatment method is found for the zinc leaching residue with a low zinc content; roasting with coal is not needed, thus the smoke pollution problem is avoided; return water can be recycled; and floatingtailings are subjected to low-toxicity treatment, and dry stockpiling can be used for replacing full size tailings library stockpiling, therefore, potential safety hazards of the full size tailings library are eliminated.

Description

technical field [0001] The invention relates to a beneficiation method for recovering lead, zinc and silver, in particular to a beneficiation method for recovering lead, zinc and silver from zinc leaching slag. Background technique [0002] The raw material of the zinc smelter - zinc concentrate generally contains about 50% zinc (existing as ZnS) and about 1.5-3% lead (existing as PbS). The slag rate of the raw material is about 50%, so the grade of lead in the leaching slag will be more than doubled than the original enrichment, reaching more than 3-6% (mainly converted into PbSO 4 form). The leaching slag of this hydrometallurgy plant is an important secondary resource of lead. [0003] The leaching slag of the wet zinc smelting plant also contains zinc metal with recycling value. The zinc minerals contained in the leaching slag are mainly acid insoluble zinc minerals, the most common being zinc ferrite, followed by zinc silicate. When the zinc sulfide concentrate cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/001B03D101/02B03D101/04
Inventor 向平凌丽莫登翌凌虹
Owner HUNAN HUAQI RESOURCES ENVIRONMENT SCI & TECH DEV CO LTD
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