Method for pre-treating complex indium-containing smoke dust by microwave roasting

A microwave roasting and pretreatment technology, applied in the direction of improving process efficiency, can solve the problems of complex process route, long leaching time, and large amount of sulfuric acid, and achieve the effects of complete chemical reaction, short processing time and high metal leaching rate.

Active Publication Date: 2013-06-05
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method greatly improves the leaching rate of indium and provides qualified material liquid for the subsequent extraction process, but there are a series of problems such as high energy consumption, large amount of sulfuric acid, serious equipment corrosion and difficult operation.
[0011] Based on the above-mentioned indium extraction process, it can be found that no matter what the process is, it needs to be leached. However, the current leaching process has one or more problems such as low leaching rate of indium, high cost, long leaching time and complicated process route. Therefore, it is necessary to find a new process for extracting indium that can solve the above problems

Method used

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  • Method for pre-treating complex indium-containing smoke dust by microwave roasting
  • Method for pre-treating complex indium-containing smoke dust by microwave roasting
  • Method for pre-treating complex indium-containing smoke dust by microwave roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Zinc oxide dust generated when zinc is smelted by a lead-zinc smelter in Yunnan is a complex indium-containing dust raw material, and the main chemical composition (mass fraction %) of the raw material is as follows:

[0030]

[0031] (1) Mix 100g of the above-mentioned complex indium-containing dust with a particle size of -250 mesh accounting for 90% at a liquid-solid ratio (mL / g) of 1:2, mix it evenly with concentrated sulfuric acid, put it into the reaction chamber of a microwave high-temperature furnace, and then Roasting at a temperature of 100°C for 3 hours under the condition of a microwave power of 300W to obtain calcined sand;

[0032] (2) After crushing the calcined sand obtained in step (1), leaching with sulfuric acid solution with a concentration of 18g / L at a liquid-solid ratio of 4:1 at 50°C (stirring intensity 480r / min) for 0.5h, and then Carry out solid-liquid separation to obtain leaching solution and leaching slag; the leaching rates of soluble va...

Embodiment 2

[0035] The indium-containing fume produced when smelting lead in a lead-zinc smelter in Yunnan is a complex indium-containing fume raw material. The main chemical composition (mass fraction %) of the raw material is as follows:

[0036]

[0037] (1) Mix 100g of the complex indium-containing dust with a particle size of -250 mesh accounting for 85% of the above-mentioned indium-containing fumes at a liquid-solid ratio (mL / g) of 0.7︰2, mix them evenly with concentrated sulfuric acid, put them into the reaction chamber of a microwave high-temperature furnace, and then Roasting at a temperature of 250°C for 1 hour under the condition of a microwave power of 400W to obtain calcined sand;

[0038] (2) After crushing the calcined sand obtained in step (1), use a sulfuric acid solution with a concentration of 12g / L to carry out stirring and leaching at 40°C for 1 hour at a liquid-solid ratio of 4:1, and then perform solid-liquid separation to obtain the leachate and Leaching slag; ...

Embodiment 3

[0041] The industrial soot from a copper smelting factory is used as a complex indium-containing soot raw material. The main chemical composition (mass fraction, %) of the raw material is as follows:

[0042]

[0043](1) Mix 100g of the complex indium-containing dust with a particle size of -250 mesh accounting for 80% of the above-mentioned indium-containing fumes at a liquid-solid ratio (mL / g) of 0.5︰2, mix them evenly with concentrated sulfuric acid, and put them into the reaction chamber of a microwave high-temperature furnace, and then Roasting at a temperature of 200°C for 0.5h at a microwave power of 500W to obtain calcined sand;

[0044] (2) After crushing the calcined sand obtained in step (1), use a sulfuric acid solution with a concentration of 25g / L at a liquid-solid ratio of 4:1 to carry out stirring and leaching at 23°C for 2 hours, and then perform solid-liquid separation to obtain the leachate and Leaching slag; the leaching rates of soluble valuable metals ...

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Abstract

The invention provides a method for pre-treating complex indium-containing smoke dust by microwave roasting. The method comprises the following steps of: uniformly mixing the complex indium-containing smoke dust with concentrated sulphuric acid, and then roasting the mixture for 0.5 hour to 3 hours at 100 DEG C to 250 DEG C under the condition with microwave powder or 300W-500W to obtain a roasted product; crushing the roasted product, stirring and soaking the crushed rotated product in a sulphuric acid solution for 0.5 hour to 2 hours at 23 DEG C to 50 DEG C, so as to obtain leachate and leached residue by carrying out solid-liquid separation, wherein the leaching efficiency of easy-soluble valuable metals such as indium, zinc and the like in the materials is higher than 95%; and extracting the indium in the complex indium-containing smoke dust by leafing most of the metals such as lead, iron and the like in the slag. The method disclosed by the invention has the technical characteristics of being high in metal leaching efficiency, small in reagent consumption amount, short in treatment time, low in energy consumption, concentrated in valuable metals. Most of the metals such as the lead, the iron and the like are left in the slag, so that beneficial conditions are created for the subsequent indium treatment process.

Description

technical field [0001] The invention belongs to the field of indium smelting combined by fire method and wet method, and relates to a method for microwave roasting pretreatment of complex indium-containing fumes. Background technique [0002] The distribution of indium in the earth's crust is small and scattered, and no rich ore has been found so far, but it exists as an impurity in metal ores such as zinc and lead. Indium has been initially enriched in some non-ferrous metal concentrates, but because the grade is still quite low, generally it cannot be directly used to extract indium. In the process of non-ferrous metal concentrate smelting and blast furnace ironmaking, indium will be enriched to a considerable extent in some production processes and intermediate products or by-products according to its behavior and direction, and become the main raw material for indium extraction, such as slag, Leaching slag, solution, soot, alloy and anode slime, etc. At present, domest...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B1/06C22B3/08C22B3/26C22B58/00
CPCY02P10/20
Inventor 常军彭金辉陈景张利波曹亚兵
Owner KUNMING UNIV OF SCI & TECH
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