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Method for purifying zinc hydrometallurgy leaching solution

A technology for hydrometallurgy and leaching solution, applied in the field of hydrometallurgy, can solve the problems of calcium sulfate scaling, poor defluorination effect, etc., and achieve the effect of no reaction temperature, wide applicable temperature range, and efficient enrichment.

Active Publication Date: 2016-12-07
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, a small amount of milk of lime can be added during the leaching process, so that calcium hydroxide and fluoride ions form insoluble calcium fluoride, which is polymerized on silica gel and adsorbed on silica gel, and the silica gel is regenerated by rinsing with water to remove fluorine. The fluoride removal rate of this method Only 26%~54%, the defluoridation effect is not good, and the introduction of lime will cause calcium sulfate scaling problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Make 1L of zinc sulfate with a pH of 1.5, 52 mg / L of germanium ions, 60 mg / L of arsenic ions, 85.6 g / L of zinc ions, 150 mg / L of fluoride ions, 0.2 g / L of ferric iron and 2.2 g / L of ferrous iron. The acid leaching solution was added to the beaker, and an appropriate amount of hydrogen peroxide was added to oxidize all ferrous iron to ferric iron, and a small amount of ferric sulfate was added to make the total iron ion concentration 5.0 g / L.

[0028] Add 30ml of lepidocerite (γ-FeOOH) slurry containing 10g / L iron in the reaction kettle as the bottom liquid, start stirring, control the temperature at 25°C, slowly pump in the oxidized low-acid leachate, and at the same time slowly add 200-mesh zinc calcine to maintain the reaction pH of the solution system = 2.8. After the addition of the zinc sulfate leaching solution is completed, continue to keep the reaction pH=3.5 and the temperature at 25°C for 20 minutes, vacuum filter, and the resulting filter residue is washed an...

Embodiment 2

[0030] 1L of pH 2.0, containing germanium ions 60mg / L, arsenic ions 100mg / L, zinc ions 73.6 g / L, fluoride ions 162 mg / L, ferric ions 0.7g / L, ferrous ions 2.6g / L Zinc oxide soot sulfuric acid leaching solution is added to the beaker, and an appropriate amount of hydrogen peroxide is added to oxidize all the ferrous iron to ferric iron.

[0031] Add 30ml of lepidocerite (γ-FeOOH) slurry containing 20g / L iron in the reaction kettle as the bottom liquid, start stirring, control the temperature at 45°C, and slowly pump in the oxidized zinc oxide soot sulfuric acid leaching solution, and at the same time Slowly add saturated solution of ammonium bicarbonate (ammonium bicarbonate) to maintain the reaction pH of the solution system = 4.0. After the addition of the zinc sulfate leaching solution is completed, the reaction pH and temperature are continued to be maintained for 25 minutes to stop the reaction, and vacuum filtration is performed. After the obtained filter residue is washed...

Embodiment 3

[0033] Add 1 L of zinc sulfate neutral leaching solution with a pH of 3.5, 10 mg / L of germanium ions, 22 mg / L of arsenic ions, 62.5 g / L of zinc ions, 82 mg / L of fluoride ions, and 0.6 g / L of ferrous ions into the beaker , and feed oxygen at the same time to oxidize all the ferrous iron to ferric iron, and add ferric sulfate to make the overall concentration of the solution reach 3g / L.

[0034]Add 30ml of 15g / L iron-containing lepidocerite (γ-FeOOH) slurry into the reaction kettle as the bottom liquid, start stirring, control the temperature at 85°C, slowly pump in the oxidized zinc sulfate leachate, and at the same time slowly add Sodium hydroxide solution to maintain the reaction pH of the solution system = 4.8. After the addition of the zinc sulfate leaching solution is completed, the reaction pH and temperature are continued to be maintained for 20 minutes to stop the reaction, and vacuum filtration is performed. After the obtained filter residue is washed and dried with di...

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PUM

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Abstract

The invention discloses a method for purifying a zinc hydrometallurgy leaching solution. The method is particularly suitable for a zinc sulfate solution or zinc oxide soot sulfate leaching solution obtained after high acid leaching-jarosite (ammonium alum) process iron removal. The method includes the steps that ferroporphyrin in an oxidation solution or a supplement iron source is used for guaranteeing the ferric iron concentration of the solution at first; then seed crystal-lepidocrocite (gamma-FeOOH) slurry is added into a reaction still; afterwards, a zinc sulfate leaching solution with impurities to be removed is added slowly; and meanwhile, a neutralizer is added, the reaction pH value and temperature are controlled, most of ions of ferric iron, arsenic, germanium, fluorine and the like in the solution or all the ions are precipitated, and obtained precipitation sludge is easy to filter and wash. The technological process is simple, and cost is low. Detrimental impurities (like iron, arsenic, fluorine and germanium) generated in the zinc electroanalysis process can be removed, and meanwhile effective enrichment of the germanium is realized, so that the method is suitable for industrialized application.

Description

technical field [0001] The invention discloses a method for purifying zinc hydrometallurgy leachate, belonging to the field of hydrometallurgy. Background technique [0002] Commonly used iron removal methods in the solution purification process include neutralization precipitation method, jarosite (ammonium) jarosite method, goethite method (α-FeOOH) and hematite method (Fe 2 o 3 ), etc., the neutralization precipitation method is to oxidize ferrous iron into ferric iron, and then adjust the pH to precipitate iron. This method has a large amount of slag, is not easy to filter, and has a large loss of solution. The applicable solution iron concentration is generally lower than 2g / L; jarosite (ammonium) jarosite method is a method of removing iron from the zinc hot acid leaching solution by making the iron in the zinc leaching solution form a jarosite-like crystal precipitate and be removed. This method is widely used in wet zinc smelting plants in the world. Iron removal ...

Claims

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Application Information

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IPC IPC(8): C22B19/20C22B3/44
CPCC22B3/44C22B19/26Y02P10/20
Inventor 周兆安张银亮刘小文姚标毛谙章米永红李钧冯凡让郑晓凤马千里
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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