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Low grade zinc concentrate associated lead and silver recovery process

A zinc concentrate, low-grade technology, applied in the direction of improving process efficiency, etc., can solve the problems of low recovery rate and few types of recycled metals, etc., achieve the effect of thorough decomposition, improve the level of comprehensive utilization, and extend the industrial chain

Active Publication Date: 2012-09-19
巴彦淖尔紫金有色金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is reported in the literature that flotation is used to recover valuable metals in high leaching slag, but because there are not many types of recycled metals and the recovery rate is not high, it has not really been put into actual production and application.

Method used

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  • Low grade zinc concentrate associated lead and silver recovery process
  • Low grade zinc concentrate associated lead and silver recovery process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The above-mentioned low-grade zinc concentrate associated lead, silver recovery process, its process steps are further:

[0043] 1) Neutral leaching: neutral leaching is the process of leaching zinc from zinc calcine through the mixed reaction of sulfuric acid and zinc calcine.

[0044] Reaction temperature: 70°C-80°C; Reaction time: 2.5h-3h; Liquid-solid ratio: 7-9:1; Final acidity: pH=5.2-5.4, medium-intensity stirring;

[0045] 2) Low-acid leaching: Low-acid leaching is through the full reaction of high-acid supernatant and neutral leaching low flow. First, the zinc in the neutral leaching low flow should be leached as low as possible. During this process, the generation of "jarsite" increases the amount of slag in low-acid leaching slag, which affects the grade of lead and silver in high-temperature and high-acid leaching slag;

[0046] Reaction temperature: 50°C-65°C; Reaction time: 1.5h-2.0h; Liquid-solid ratio: 5-7:1; Final acidity: 15g / L-19g / L; Medium-intensity...

Embodiment 2

[0056] Low acid leaching experiment

[0057] The results of the analysis of the supernatant of the high leaching are shown in Table 1

[0058] Table 1 Analytical data of high acid leaching supernatant (g / L)

[0059] Numbering

[0060] Experimental conditions: liquid-solid ratio: 5:1, reaction temperature 55-60°C, final acidity 15-19g / L, reaction time 1.5h, the experimental results are shown in Table 2:

[0061] Table 2 Data analysis of bottom leaching test results (g / L)

[0062] Numbering

[0063] The experimental conclusions show that the generation of jarosite is effectively avoided in the low-acid leaching process, and there is almost no jarosite slag in the low-leaching underflow.

[0064] High acid leaching test

[0065] Experimental conditions: liquid-solid ratio 8:1, reaction temperature 90-95°C, final acidity 85-100g / L, reaction time 3h, the experimental results are shown in Table 3:

[0066] Table 3 Analysis data of high acid leaching experim...

Embodiment 3

[0075] Implementation of two-stage sinking alum-enriching silver leaching process

[0076] neutral leaching

[0077] Process principle

[0078] Add waste electrolyte, mixed solution, alum supernatant, anode mud slurry and manganese ore powder into the oxidation tank to control the acidity in the tank to 40-60g / L to ensure that the filtrate contains Fe 2+ <0.1g / L, continuously enter the first tank of the neutral leaching tank through the overflow port on the tank.

[0079] Four neutral leaching tanks are operated continuously in series. The calcined sand material is added to the first neutral leaching tank through the screw conveyor, and at the same time, the oxidizing solution flows into the first intermediate leaching tank through the chute, and the waste electrolyte is added to the oxidation tank and the first intermediate leaching tank according to the ratio of acid and zinc. The amount of addition is measured with PH test paper, and the pH of the outlet of the fourth ta...

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Abstract

The invention discloses a low grade zinc concentrate associated lead and silver recovery process which includes the steps of neutral leaching, low acid leaching, high acid leaching, first step jarosite precipitation, second step jarosite precipitation, and acid-washing of leached slag. The lead and silver slag recovered through the process disclosed by the invention is effectively enriched with the precious metals such as Pb and Ag from raw materials. Waste materials are changed into things of value, thereby creating new economic growth points for the enterprise, reducing the pressure on the environment caused by the stacking and disposal of the leached slag and improving the level of comprehensive use of the resources.

Description

technical field [0001] The invention relates to a process for recovering lead and silver associated with high- and low-grade zinc concentrates. 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 slow down the highlight of contradictions is to carry out major upgrades in relevant industrial technologies. In the mining...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06C22B3/44C22B19/00C22B11/00C22B13/00
CPCY02P10/20
Inventor 沙涛刘德祥孙明生沈能斌苏凤来
Owner 巴彦淖尔紫金有色金属有限公司
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