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Low pollution vanadium settling iron-removing wet zinc smelting method

A zinc hydrometallurgy and low-pollution technology, applied to the improvement of process efficiency, etc., can solve the problems of zinc and valuable metal loss, unfavorable alum slag storage, difficult operation, etc., to enhance the ability to remove impurities , Improve metal recovery rate and reduce energy consumption

Active Publication Date: 2008-03-12
CHIFENG ZHONGSE ZINC IND CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The jarosite method is relatively easy to operate and has low energy consumption, but it needs to consume a certain amount of alkaline reagents; the goethite method has less iron slag, but consumes a lot of energy, and the redox process is more complicated; the hematite method has higher investment. Complex technology and difficult operation
The process of iron removal by jarosite method needs to add a neutralizer, and almost all manufacturers using this method use zinc calcine as a neutralizer, so that part of the undissolved zinc and valuable metals will inevitably remain in the In the jarosite slag, it will lead to the loss of zinc and valuable metals, and also pollute the jarosite slag, which is not conducive to the storage of alum slag and further treatment in the future

Method used

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  • Low pollution vanadium settling iron-removing wet zinc smelting method

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Experimental program
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Embodiment 1

[0037] Embodiment 1: As shown in Figure 1, the low-pollution sinking alum of the present invention to remove iron wet zinc smelting method mainly comprises four process steps:

[0038] (1) Neutral leaching: Pour the sinking alum overflow solution and waste electrolyte into the oxidation tank continuously, and add manganese dioxide according to the ferrous content, control the acidity to 40-50g / L, and control the iron content to 1-2g / L. The liquid and calcined sand in the oxidation tank are poured into the intermediate immersion tank continuously, the pH of the ore slurry in the intermediate immersion tank is controlled to be 5.0-5.4, the solid-liquid ratio is 1:12-14, the temperature is 65-72°C, and the time is 1-1.2h. Neutral leaching overflow liquid and neutral leaching underflow liquid are produced through intermediate leaching thickening.

[0039] (2) Low-temperature pre-neutralization: Put the neutral leaching underflow liquid and the high-temperature high-acid leaching...

Embodiment 2

[0042] Embodiment 2: process step is identical with embodiment 1, and process parameter is as follows:

[0043] (1) Neutral leaching: control the solid-liquid ratio of 1:8~10, the initial acidity is 35~40g / L, the iron content is controlled at 1~2g / L, the pH of the pulp in the intermediate leaching tank is 4.8~5.2, and the temperature is 55~ 65 ℃, time 1.5 ~ 2h.

[0044] (2) Low-temperature pre-neutralization: control the solid-liquid ratio to 1:6-8, the initial acidity is 35-38g / L, the final acidity is 9-15g / L, the reaction temperature is 55-62°C, and the reaction time is 1.2-1.5h.

[0045] (3) High-temperature and high-acid leaching: control the solid-liquid ratio to 1:6-9, the initial acidity is 140-150g / L, the final acidity is 55-65g / L, the reaction temperature is 90-95°C, and the reaction time is 3.8-4.2h.

[0046] (3) Low-pollution sinking alum for iron removal: control the solid-liquid ratio to 1:8-10, the initial acidity is 10-12g / L, the end-point Fe≤2g / L, the reaction...

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Abstract

The present invention discloses a kind of wet zinc smelting process, which includes four main technological steps of neutral leaching, low temperature pre-neutralizing, high temperature high acid concentration leaching, and low pollution vanadium settling and iron removing. Before low pollution vanadium settling and iron removing, the high temperature high acid concentration leaching step has iron leached at most, and the solution composition is regulated in the low temperature pre-neutralizing step for satisfactory iron removing effect during vanadium settling without need of adding neutralizing agent. The technological process is suitable for treating complicated zinc concentrate, and has raised metal recovering rate, strengthened impurity removing capacity, raised ultimate product quality, lowered material and power consumption and reduced pollution.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a zinc hydrometallurgy method. Background technique [0002] At present, the methods for zinc removal by wet smelting mainly include jarosite method, goethite method and hematite method. Their common feature is that high temperature and high acid leaching is used to dissolve the zinc ferrite in the roasted ore, thereby improving the zinc content. recovery rate, and to separate the iron and zinc into the solution. The difference is that when iron and zinc are separated, the iron in the solution is separated from the solution in different forms of iron precipitates. The jarosite method is currently the most widely used process in zinc hydrometallurgy. More than half of the world's hydrometallurgy zinc production is produced by the jarosite method, and more than 20 factories around the world use this method Production. The jarosite method is relatively easy to o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/02C22B3/04
CPCY02P10/20
Inventor 王凤朝李龙冯国军霍瑞龙段贵军白音朱永良魏登文张国柱马永涛张力文李国恩
Owner CHIFENG ZHONGSE ZINC IND CO LTD
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