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Method for leaching indium from indium sulfide concentrate

A technology for indium sulfide and indium concentrate is applied in the smelting field of extracting indium, which can solve the problems of large consumption of reagents, large environmental pollution, dispersion of valuable metals, etc., and achieve the effects of concentration of valuable metals, simplification of smelting process, and process enhancement

Inactive Publication Date: 2008-01-30
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Conventional technology cannot be used to recycle and utilize separate indium sulfide concentrates, because the indium compounds in indium sulfide concentrates (containing about 1500-4500 g / t of indium) cannot be dissolved by simple acid leaching, but roasted Technology and process will make indium dispersion lead to long and complicated process, not to mention the complex behavior of indium minerals in indium sulfide concentrate, which fundamentally limits the recovery and utilization of this single indium concentrate by conventional technology and process, so , the disadvantages of the above method are that the technical process is complicated, the metal recovery rate is low, the valuable metal is dispersed, the reagent consumption is large, it is difficult to overcome the complexity of the mineral, the extraction and separation of indium in the mineral is difficult, and the environmental pollution is large.

Method used

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  • Method for leaching indium from indium sulfide concentrate
  • Method for leaching indium from indium sulfide concentrate
  • Method for leaching indium from indium sulfide concentrate

Examples

Experimental program
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Effect test

example 1

[0069] Example 1: At a temperature of 100°C and normal pressure:

[0070] For indium sulfide concentrate containing 4500 g / t of indium, 23% iron, 31% sulfur and nitric acid oxidant (HNO 3 content 60%) and concentrated sulfuric acid (H 2 SO 4 content 98%) aqueous solution is mixed, pumped into the reaction tank continuously with a pump, the temperature in the kettle is controlled at 100°C ± 1 with steam or tap water, the particle size of the concentrate is 200 mesh, H 2 SO 4 :In molar ratio is 600:1, HNO 3 The :In molar ratio is 100:1, the liquid-solid ratio is 10:1, under normal pressure conditions, the chemical reaction of oxidation and dissolution of indium sulfide concentrate is carried out, and the reaction time is 240 minutes. The NO gas generated during the reaction is oxidized, and then generates nitric acid when it meets water, and the nitric acid catalyst is recycled.

[0071] Indium leaching rate is 95%.

example 2

[0072] Example 2: At a temperature of 60°C, under normal pressure conditions:

[0073] For indium sulfide concentrate containing 1500 g / t of indium, 35% iron, 29% sulfur and nitric acid oxidant (HNO 3 content 10%) and sulfuric acid (H 2 SO 4 content 50%) aqueous solution is mixed, pumped into the reaction tank continuously with a pump, the temperature in the kettle is controlled at 60°C ± 1 with steam or tap water, the concentrate particle size is 150 mesh, H 2 SO 4 :In molar ratio is 300:1, HNO 3 The :In molar ratio is 50:1, the liquid-solid ratio is 3.5:1, and the oxidation and dissolution chemical reaction of indium sulfide concentrate is carried out, and the reaction time is 10 minutes. The NO gas generated during the reaction is oxidized, and then generates nitric acid when it meets water, and the nitric acid catalyst is recycled.

[0074] Indium leaching rate is 65%.

example 3

[0075] Example 3: At a temperature of 85°C, under normal pressure conditions:

[0076] For indium sulfide concentrate containing 3000 g / t of indium, 28% iron, 38% sulfur and catalyst nitric acid (HNO 3 content 50%) and sulfuric acid (H 2 SO 4 content 65%) aqueous solution is mixed, pumped into the reaction tank continuously with a pump, the temperature in the kettle is controlled at 85°C ± 1 with steam or tap water, the concentrate particle size is 200 mesh, H 2 SO 4 :In molar ratio is 450:1, HNO 3 The :In molar ratio is 75:1, the liquid-solid ratio is 5.0:1, and the oxidation and dissolution chemical reaction of indium sulfide concentrate is carried out, and the reaction time is 120 minutes. The NO gas generated during the reaction is oxidized, and then generates nitric acid when it meets water, and the nitric acid catalyst is recycled.

[0077] Indium leaching rate is 91.5%.

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Abstract

An indium leaching method from indium sulfide concentrate ore pertains to the smelting technique of indium extracting, in particular to the smelting technique of recovery and utilization to the independent indium sulfide concentrate ore. The method has steps that: the indium sulfide concentrate ore, sulfuric acid solution and nitric acid solution are added into a reactor container to do oxidation and dissolution and obtained indium sulfide is added into liquid; then indium is distilled and separated out through extraction, stripping, replacement technologies; meanwhile sulfur and iron concentrating in leaching slag are recovered after reaction. The invention can directly recover and utilize the independent indium sulfide concentrate ore, can simplify the smelting technology and strengthen the process, and the invention is characterized by high metal recovery rate, easy indium separation, low reagent consumption and valuable metals centralization and low pollution.

Description

technical field [0001] The invention belongs to the smelting technology for extracting indium, in particular to the smelting technology for recovering and utilizing the single indium sulfide concentrate. Background technique [0002] In nature, elemental indium is very rare, and indium is mainly associated with sulfide minerals such as sphalerite, cassiterite, pyrite, chalcopyrite, and galena. During the beneficiation process of indium-containing polymetallic ore deposits, the scattered metal indium can be enriched into indium sulfide concentrate. The indium sulfide concentrate contains 1500-4500 grams / ton of indium, 18-35% iron, 26-38% sulfur, and valuable metal elements such as copper, zinc, lead, tin, antimony, and arsenic. The minerals of indium in indium sulfide concentrate mainly include pyridinite (FeIn 2 S 4 ), Copper Indium (CuInS 2 ), sulfur indium copper zinc tin iron ore {Me 3 (InSn)S 4} (Me is Cu, Zn, Fe) and indium stone (In(OH) 3 ); Iron minerals includ...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/26C22B3/46C22B58/00C01B21/40
CPCY02P20/584Y02P10/20
Inventor 魏昶李存兄樊刚
Owner KUNMING UNIV OF SCI & TECH
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