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Neutralization process for wet-process zinc smelting high-acid-leaching low-pollution vanadium precipitation process

A technology of high acid leaching and hydrometallurgy zinc, which is applied in the direction of improving process efficiency, can solve the problems of reducing recovery rate, existing hidden dangers of environmental pollution, loss of zinc and cadmium, etc., and achieves the effect of good process effect.

Active Publication Date: 2013-03-20
CHIFENG ZHONGSE ZINC IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only the zinc and cadmium in the cadmium smelting slag are lost, the recovery rate is reduced, the storage cost is increased, and there is also a hidden danger of environmental pollution

Method used

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  • Neutralization process for wet-process zinc smelting high-acid-leaching low-pollution vanadium precipitation process

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: as figure 1 As shown, a zinc hydrometallurgy high-acid leaching low-pollution sinking alum neutralization process includes four process steps: neutral leaching, low-temperature pre-neutralization, high-temperature high-acid leaching and low-pollution sinking alum for iron removal. In the alum iron removal step, add low-temperature pre-neutralized overflow liquid, ammonium bicarbonate, sodium bicarbonate and cadmium smelting slag, wherein the ratio of parts by weight of ammonium bicarbonate, sodium bicarbonate and cadmium smelting slag is: bicarbonate 1 part of ammonium, 1 part of sodium bicarbonate, 3 parts of cadmium smelting slag; the solid-liquid ratio is 1:10, the pH value of the initial acid is 1.5-1.8, and the pH value of the final acid is 1.6-2.0; the end-point Fe≤3g / L, the reaction temperature is 90 Above ℃, the reaction time is 3 hours; let the ferric ions in the solution become jarosite crystals that are not soluble in sulfuric acid, but also sol...

Embodiment 2

[0026] Embodiment 2: as figure 1 As shown, a zinc hydrometallurgy high-acid leaching low-pollution sinking alum neutralization process includes four process steps: neutral leaching, low-temperature pre-neutralization, high-temperature high-acid leaching and low-pollution sinking alum for iron removal. In the alum iron removal step, add low-temperature pre-neutralized overflow liquid, ammonium bicarbonate, sodium bicarbonate and cadmium smelting slag, wherein the ratio of parts by weight of ammonium bicarbonate, sodium bicarbonate and cadmium smelting slag is: bicarbonate 1 part of ammonium, 2 parts of sodium bicarbonate, 4 parts of cadmium smelting slag; the solid-liquid ratio is 1:8, the pH value of the initial acid is 1.8-2, and the pH value of the final acid is 1.9-2.5; the end point contains Fe≤3g / L, and the reaction temperature is 90 Above ℃, the reaction time is 4 hours; let the ferric ions in the solution become jarosite crystals that are not soluble in sulfuric acid, b...

Embodiment 3

[0027] Embodiment 3: as figure 1 As shown, a zinc hydrometallurgy high-acid leaching low-pollution sinking alum neutralization process includes four process steps: neutral leaching, low-temperature pre-neutralization, high-temperature high-acid leaching and low-pollution sinking alum for iron removal. In the alum iron removal step, add low-temperature pre-neutralized overflow liquid, ammonium bicarbonate, sodium bicarbonate and cadmium smelting slag, wherein the ratio of parts by weight of ammonium bicarbonate, sodium bicarbonate and cadmium smelting slag is: bicarbonate 2 parts of ammonium, 1 part of sodium bicarbonate, 8 parts of cadmium smelting slag; solid-liquid ratio 1:12, initial acid pH value 1.6-1.9, final acid pH value 1.7-2.2; end-point Fe≤3g / L, reaction temperature 90 Above ℃, the reaction time is 5 hours; let the ferric ions in the solution become jarosite crystals that are not soluble in sulfuric acid, but also soluble in precipitation, washing and filtration, an...

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Abstract

The invention discloses a neutralization process for wet-process zinc extraction high-acid-leaching low-pollution jarosite, which comprises four process steps: neutral leaching, low-temperature pre-neutralization, high-temperature and high-acid leaching and low-pollution jarosite iron removal. The neutralization process is characterized in that in the step of the low-pollution jarosite iron removal, ammonium hydrogen carbonates, sodium bicarbonate and cadmium melting slag are added into low-temperature pre-neutralization overflowing liquid so that ferric ions in the solution become sulphuric-acid-insoluble and easily precipitated jarosite crystals to be precipitated, and the solution carries out neutral leaching after the jarosite precipitation. The cadmium melting slag is adopted for replacing partial sodium hudroxide and ammonium hydrogen carbonate to be used as neutralization agents and jarosite precipitation agents, a better technical effect can be reached, and valuable metals such as zinc, cadmium and the like in the cadmium melting slag are also recovered.

Description

technical field [0001] The invention relates to the technical field of non-ferrous metal smelting, in particular to a hydrometallurgy zinc alum sinking neutralization process with high acid leaching and low pollution. Background technique [0002] With the rapid development of the zinc hydrometallurgy process, the high acid leaching-low pollution alum sinking process has been rapidly developed at home and abroad. For example, the invention patent CN100374592C applied by our company "a low-pollution sinking alum to remove iron and zinc smelting method", the method mainly includes neutral leaching, low-temperature pre-neutralization, high-temperature high-acid leaching and low-pollution sinking alum to remove iron. Process steps, before removing iron from low-pollution sinking alum, first leaching iron at high temperature and high acid to maximize the leaching of iron, then adjusting the composition of the solution through low-temperature pre-neutralization, and finally adding...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B19/20C22B3/04
CPCY02P10/20
Inventor 王凤朝李龙马永涛张春明曹延峰冯国军曹猛朱永良关旭东孙晓军肖常玲
Owner CHIFENG ZHONGSE ZINC IND CO LTD