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A kind of hydrometallurgy zinc leaching iron sinking process

A technology of leaching and sinking iron, applied in the field of hydrometallurgy, can solve the problems of zinc metal loss, inability to handle high-iron raw materials, etc., and achieve the effect of complete separation

Active Publication Date: 2018-02-09
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional jarosite method refers to adding zinc calcine in the sinking process to neutralize the acidity continuously released during the sinking iron process, so that it meets the condition of ph value of 1.5 in the sinking iron process, and can handle high-iron raw materials, but inevitably makes zinc Undissolved zinc from the calcine remains in the jarosite slag, causing loss of zinc metal
The low-pollution jarosite process mainly controls the final acid of pre-neutralization by adjusting the amount of pre-neutralization calcine, so that it meets the condition of ph value of 1.5 in the sinking iron process, so as to realize sinking alum without adding zinc-containing materials , to avoid the disadvantages of high insoluble zinc, but the acidity released during the iron sinking process makes it impossible to process high-iron raw materials

Method used

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  • A kind of hydrometallurgy zinc leaching iron sinking process
  • A kind of hydrometallurgy zinc leaching iron sinking process
  • A kind of hydrometallurgy zinc leaching iron sinking process

Examples

Experimental program
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Effect test

Embodiment 1

[0030] According to the production capacity of 100,000 tons of electric zinc, that is, 303t / d electric zinc, the iron content of calcine is 10%, and the iron content of the supernatant of the first stage is 16.22g / L.

[0031] A. Add 19.4t / h zinc calcined sand with 55% zinc content to 170g / L acid content, 58m 3 / h of waste electrolyte and acid containing 15g / L, 112m 3 130m 3 / h, 155g / L medium supernatant and 40m 3 / h neutral leaching underflow, add 72m to the neutral leaching underflow 3 / h, 80-100g / L stage II acid leaching filtrate and 30 m 3 / h, 55-70 g / L pickling filtrate was leached in stage I, and after dense separation, 30 m 3 / h undercurrent and 112m 3 / h, 25-35g / L of stage I supernatant (return to conventional jarosite to precipitate iron). Add 42m 3 / h, 170g / L waste liquid and 0.77m 3 / h, 98% concentrated sulfuric acid for stage II leaching, after dense separation, underflow and 72m 3 / h, 80-100 g / L acid leaching filtrate in the second stage, the filter residu...

Embodiment 2

[0036]According to the production capacity of 100,000 tons of electric zinc, that is, 303t / d electric zinc, the iron content of the calcined sand is 12%, and the iron content of the supernatant of the first stage is 19.47g / L.

[0037] A. Add 19.4t / h zinc calcined sand with 55% zinc content to 170g / L acid content, 58m 3 / h of waste electrolyte and acid containing 15g / L, 112m 3 130m 3 / h, 155g / L medium supernatant and 40m 3 / h neutral leaching underflow, add 72m to the neutral leaching underflow 3 / h, 80-100g / L stage II acid leaching filtrate and 30 m 3 / h, 55-70 g / L pickling filtrate was leached in stage I, and after dense separation, 30 m 3 / h undercurrent and 112m 3 / h, 25-35g / L of stage I supernatant (return to conventional jarosite to precipitate iron). Add 42m 3 / h, 170g / L waste liquid and 0.77m 3 / h, 98% concentrated sulfuric acid for stage II leaching, after dense separation, underflow and 72m 3 / h, 80-100 g / L stage II acid leaching filtrate, the filter residue ...

Embodiment 3

[0042] According to the production capacity of 100,000 tons of electric zinc, that is, 303t / d electric zinc, the iron content of calcine is 14%, and the iron content of the supernatant of the first stage is 22.71g / L.

[0043] A. Add 19.4t / h zinc calcined sand with 55% zinc content to 170g / L acid content, 58m 3 / h of waste electrolyte and acid containing 15g / L, 112m 3 130m 3 / h, 155g / L medium supernatant and 40m 3 / h neutral leaching underflow, add 72m to the neutral leaching underflow 3 / h, 80-100g / L stage II acid leaching filtrate and 30 m 3 / h, 55-70 g / L pickling filtrate was leached in stage I, and after dense separation, 30 m 3 / h undercurrent and 112m 3 / h, 25-35g / L of stage I supernatant (return to conventional jarosite to precipitate iron). Add 42m 3 / h, 170g / L waste liquid and 0.77m 3 / h, 98% concentrated sulfuric acid for stage II leaching, after dense separation, underflow and 72m 3 / h, 80-100 g / L stage II acid leaching filtrate, the filter residue is washed...

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Abstract

The invention discloses a zinc hydrometallurgy leaching and iron precipitation process. The first phase comprises the steps of precipitating iron by adopting the conventional jarosite method, adding roasted ore and ammonium carbonate so as to make sure that the liquid Fe is less than 10 g / L after the primary iron precipitation, and putting thick underflow into a jarosite slag pickling procedure; and the second phase comprises the steps of precipitating iron by adopting a low-pollution jarosite method, adding ammonium carbonate and calcium carbonate so as to make sure that the liquid Fe is less than 2 g / L after the secondary iron precipitation, wherein the obtained jarosite slag is pure jarosite slag, and underflow is not needed to be pickled and is mixed with the pickled thick underflow for pressure filtration. According to the zinc hydrometallurgy leaching and iron precipitation process, by the adoption of the low-pollution jarosite and conventional jarosite combination iron precipitation process, i.e.: under a condition of high iron ores, the iron is precipitated in two phases; in the first phase, the iron is precipitated by adopting the conventional jarosite method, and in the second phase, the iron is precipitated by adopting the low-pollution jarosite method. By the adoption of the low-pollution jarosite and conventional jarosite two-phase combination iron precipitation process, the problem of high zinc content of jarosite is solved, and the two leached impurities are completely separated.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, relates to hydromethod zinc smelting in the lead-zinc smelting industry, and in particular relates to a hydromethod zinc leaching iron-precipitating process. technical background [0002] Most of the domestic hydro-smelting zinc leaching mainly adopts the high-temperature high-acid-jarosite process. High temperature and high acid increase the leaching rate of zinc, and at the same time, a large amount of iron enters the solution. The main purpose of jarosite is to remove ferric ions in the solution, which belongs to acid release reaction. Therefore, there are two kinds of jarosite methods: conventional jarosite method and low-pollution jarosite method. Conventional jarosite method refers to adding zinc calcine in the sinking process to neutralize the acidity continuously released during the sinking iron process, so that it meets the condition of ph value of 1.5 in the sinking iron proces...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/44C22B19/20C22B13/00C22B11/00
CPCC22B3/08C22B3/44C22B11/04C22B13/04C22B19/22
Inventor 马菲菲张昱琛段宏志李德磊崔耀焦晓斌
Owner BAIYIN NONFERROUS GROUP