Method for extracting zinc indium and recovering iron from high-iron high indium zinc concentrate

A technology for recovering iron from zinc concentrate is applied in the fields of extracting zinc indium and recovering iron from high iron and high indium zinc concentrate, which can solve the problems of low recovery rate of indium smelting, large amount of jarosite slag and high production cost, and achieves the realization of The effect of resource utilization, high recovery rate and efficient recovery

Inactive Publication Date: 2012-01-11
LAIBIN CHINA TIN SMELTING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this process are: (1) the amount of alum slag is large, and a large amount of coke needs to be consumed during the reduction and volatilization treatment in the rotary kiln, which leads to high production costs; (2) the smelting recovery rate of indium is low, and the production cost The average content of indium in the rotary kiln slag is 0.03%, which makes it impossible to recover the indium which accounts for about 10% of the total indium metal of the raw material zinc concentrate; A large amount of sulfur dioxide gas is produced, and the reduction of volatile flue gas needs to be absorbed and treated before it can be discharged up to the standard
Chinese patent CN200510031335.0 proposes to use a conventional neutral leaching method to dissolve most of the zinc that is easy to recover a

Method used

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  • Method for extracting zinc indium and recovering iron from high-iron high indium zinc concentrate

Examples

Experimental program
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Effect test

Embodiment 1

[0021] The zinc concentrate containing 13.6% iron, 0.055% indium, and 44% zinc is roasted at medium temperature in a fluidized fluidized furnace at a roasting temperature of 920-940°C, and the produced zinc calcine or zinc fume contains 46.8% zinc.

[0022] Add 22 cubic meters of waste electrolyte containing 150g / L of sulfuric acid and 50g / L of zinc and 87 cubic meters of liquid after sinking iron containing 119g / L of zinc and 45g / L of acid in said zinc calcine or zinc smoke dust, Neutrally leaching 10 tons of zinc calcine containing 46.8% zinc, the temperature is 60-70°C, the leaching time is 1.5 hours, and the pH of the leaching end point is 5.4; 83 cubic meters of supernatant solution containing 149g / L zinc is produced, and zinc After the powder is purified, it is electrolyzed to produce electrolytic zinc, and at the same time, 29 cubic meters of dense underflow in the middle immersion is produced.

[0023] Add 68 cubic meters of waste electrolyte containing 150g / L sulfuric...

Embodiment 2

[0029] The zinc concentrate containing 14.8% iron, 0.092% indium, and 47% zinc is roasted at medium temperature in a fluidized fluidized furnace at a roasting temperature of 910-940°C, and the produced zinc calcine or zinc fume contains 49.2% zinc.

[0030] Add 8 cubic meters of waste electrolyte containing 156g / L of sulfuric acid and 46g / L of zinc and 30 cubic meters of liquid after sinking iron containing 129g / L of zinc and 25g / L of acid in said zinc calcine or zinc smoke dust, Neutral leaching of 3.8 tons of zinc calcine or zinc fume containing 49.2% zinc, temperature 55-65 ° C, leaching time 2.0 hours, leaching end point pH = 5.4; output 29 cubic meters of supernatant solution containing zinc 146g / L , adding zinc powder for purification and electrolysis to produce electrolytic zinc, and at the same time produce 10 cubic meters of dense underflow in the middle immersion.

[0031] Add 24 cubic meters of waste electrolyte containing 150g / L of sulfuric acid and 50g / L of zinc a...

Embodiment 3

[0037] The zinc concentrate containing 19.8% iron, 0.25% indium, and 48% zinc is roasted at medium temperature in a fluidized fluidized furnace at a roasting temperature of 930-950°C, and the produced zinc calcine or zinc fume contains 51.2% zinc.

[0038] Add 11 cubic meters of waste electrolyte containing 150g / L of sulfuric acid and 50g / L of zinc and 43 cubic meters of liquid after sinking iron containing 119g / L of zinc and 45g / L of acid in said zinc calcine or zinc smoke dust, Neutral leaching of 5 tons of zinc calcined sand containing 51.2% zinc was carried out at a temperature of 65-70°C, leaching time of 1.5 hours, and pH of the leaching end point = 5.2; 41.5 cubic meters of supernatant solution containing 150 g / L of zinc was produced, and at the same time A dense underflow of 14.5 cubic meters is produced.

[0039] Add 34 cubic meters of waste electrolyte containing 157g / L of sulfuric acid and 45g / L of zinc and 1.5 tons of high-iron and high-indium-zinc concentrate to 1...

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Abstract

A method for extracting zinc indium and recovering iron from high-iron high indium zinc concentrate comprises the following steps: roasting high-iron high indium zinc concentrate which comprises 13-20% of Fe and 0.05-0.25% of In to produce zinc calcine; performing neutral leaching of zinc calcine; performing hot acid reduction and leaching of the neutral leached residues; performing preneutralization of the hot acid reduced leachate by zinc oxide; performing replacement and indium deposition of the preneutralized solution by zinc powder; performing iron deposition of the solution after indium deposition by oxygen-compressed hematite to produce hematite slag with 55-65% of iron; separating sulfur concentrate and flotation tailings from the hot acid reduced leached residues by a flotation method, returning the sulfur concentrate for boiling and roasting treatment, allowing the tailings to enter a fuming furnace for reduction and volatilization treatment.

Description

technical field [0001] The invention relates to a nonferrous metal smelting process, in particular to a method for extracting zinc indium and recovering iron from high iron and high indium zinc concentrate. Background technique [0002] At present, the smelting process for extracting zinc and indium from high-iron high-indium zinc concentrate is as follows: boiling furnace desulfurization of high-iron high-indium zinc concentrate; hot acid leaching of zinc calcine; precipitation of iron indium by alum method; purification of supernatant solution and electrowinning to produce electricity Zinc-alumina slag is reduced and volatilized to recover zinc and indium. This process is referred to as "hot acid leaching-jarosite method for iron precipitation" process. In this process, zinc obtains a higher leaching rate, and iron and indium are precipitated and enriched into the jarosite slag together; Reduction and volatilization treatment is carried out in the rotary kiln to obtain zi...

Claims

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Application Information

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IPC IPC(8): C22B1/10C22B3/04C22B3/20C22B19/00C22B58/00
CPCY02P10/20
Inventor 廖春图文丕忠梁敏炎宋照荣王学洪陈光耀蒋光佑陶政修
Owner LAIBIN CHINA TIN SMELTING
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