Method for processing zinc concentrate with high content of indium and iron

A treatment method, zinc concentrate technology, applied in the field of smelting of non-ferrous metals, can solve the problems of high risk, impact on benefits, low recovery rate of indium smelting, etc., achieve the effect of reducing production costs, improving equipment efficiency, and considerable economic benefits

Active Publication Date: 2014-04-23
CENT SOUTH UNIV
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AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: (1) the primary leaching rate of zinc is low, and the volatilization kiln has a large processing capacity; (2) due to the large volatilization kiln processing capacity, a large amount of coal char needs to be consumed; (3) the recovery rate of indium is low , only 75%, affecting the benefit
The main disadvantages of this method are: (1) The amount of alum slag is large, and a large amount of coke needs to be consumed in the reduction and volatilization treatment in the rotary kiln, which leads to high production costs; The average content of In in the rotary kiln slag is 0.03%, which makes the indium, which accounts for about 10% of the total indium metal of the raw material zinc concentrate, unable to be recovered; (3) Alumite slag contains a large amount of sulfate radicals, which are decomposed during the reduction and volatilization process of the rotary kiln 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
However, the production and application of this process in China is still immature, and there is no application manufacturer of hematite iron precipitation technology in the world. Therefore, there is still a relatively large risk in the production and application of this process.

Method used

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  • Method for processing zinc concentrate with high content of indium and iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , a method for processing high-indium and high-iron-zinc concentrates, the steps are as follows:

[0027] (1) Oxygen-enriched oxidation smelting: Zinc concentrate containing 0.04% In, 14% Fe, 32% Zn, and 26% S by mass is continuously added to Ausmelt with an inner diameter of 5000mm at a rate of 20t / h Furnace, while at 13500Nm 3 / h speed into the oxygen-enriched air with an oxygen volume concentration of 54% and 4500Nm 3 / h speed into the sleeve air, at a temperature of 1200 ° C, oxygen-enriched oxidation melting, and the output of 17500Nm 3 / h oxidation flue gas and 17t / h molten slag, oxidation flue gas contains SO 2 20%, containing O 2 15%, using the traditional two-turn-two-absorption process to produce sulfuric acid;

[0028] (2) Strong reduction smelting: Molten slag is added to an Ausmelt furnace with an inner diameter of 5000mm with a lead rain condenser at a rate of 17t / h for strong reduction smelting, and the reduced coal is mixed in at a rati...

Embodiment 2

[0035] see figure 1 , a method for processing high-indium and high-iron-zinc concentrates, the steps are as follows:

[0036] (1) Oxygen-enriched oxidation smelting: Zinc concentrate containing 0.14% In, 20% Fe, 40% Zn, and 28% S in terms of mass is continuously fed into an Isa furnace with an inner diameter of 5000mm at a speed of 18t / h , while at 18000Nm 3 Spray oxygen-enriched air with an oxygen volume concentration of 48% at a speed of / h, and carry out oxygen-enriched oxidation melting at a temperature of 1250°C, and produce 17500Nm 3 / h oxidation flue gas and 15.6t / h molten slag, oxidation flue gas contains SO 2 21%, containing O 2 16%, using the traditional two-to-two-absorption process to produce sulfuric acid;

[0037] (2) Strong reduction smelting: The molten slag flows into four electric furnaces with a power of 5400kVA and an inner diameter of 5000mm with a lead rain condenser at a rate of 3.9t / (h.unit) for strong reduction smelting. The ratio of 28% by mass i...

Embodiment 3

[0044] see figure 1 , a method for processing high-indium and high-iron-zinc concentrates, the steps are as follows:

[0045] (1) Oxygen-enriched oxidation smelting: Zinc concentrate containing 0.24% In, 25% Fe, 50% Zn, and 20% S in terms of mass is continuously added to the side with an inner size of 4000mm×3000mm at a speed of 5t / h. Blowing furnace at the same time with 4000Nm 3 Inject oxygen-enriched air with an oxygen volume concentration of 38% at a rate of / h, and carry out oxygen-enriched oxidation melting at a temperature of 1300°C, and produce 4300Nm 3 / h oxidation flue gas and 4.5t / h molten slag, oxidation flue gas contains SO 2 19%, containing O 2 13%, using the traditional two-turn-two-absorption process to produce sulfuric acid;

[0046] (2) Strong reduction smelting: The molten slag flows into the Isa furnace with a lead rain condenser with an inner diameter of 3400mm at a speed of 4.5t / h for strong reduction smelting. , that is, 1.35t / h, melting temperature...

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Abstract

The invention discloses a method for processing zinc concentrate with high content of indium and iron. The method comprises steps of carrying out oxygen-enriched oxidizing smelting on the zinc concentrate so as to generate oxidized smoke and fused slag, preparing sulfuric acid through the oxidized smoke; allowing the fused slag to enter a reducing smelting furnace with a lead rain condenser for strong reduction smelting so as to generate crude zinc alloy, pig iron and slag; allowing the crude zinc alloy to enter a lead tower for distilling so as to generate a zinc-cadmium alloy and a zinc-indium base solution; allowing the zinc-cadmium alloy to enter a cadmium tower for secondary distilling so as to produce pyrogenic process distilled zinc and high cadmium-zinc alloy; casting and cooling down the pyrogenic process distilled zinc so as to obtain a zinc ingot product, distilling the high cadmium-zinc alloy in a low temperature tower so as to obtain crude cadmium and a low cadmium-zinc alloy, returning the low cadmium-zinc alloy back to the cadmium tower for distilling; distilling the zinc-indium base solution in a high temperature tower so as to generate a high indium alloy and high temperature crude zinc, returning the high temperature crude zinc back to the lead tower for distilling, and extracting indium from the high indium alloy through steps of 'crushing-leaching-extracting-replacing-electrolyzing'. The method has short technological processes and high production efficiency, has clean and environment-friendly production process, and does not discharge three wastes.

Description

technical field [0001] The invention relates to a method for smelting nonferrous metals, in particular to a method for treating zinc concentrates containing 0.04% to 0.24% of In, 14% to 25% of Fe and 32% to 50% of Zn. Background technique [0002] At present, there are two main methods for extracting zinc and indium from zinc concentrates containing 0.04%-0.24% In, 14%-25% zinc, and 32-50% Zn: [0003] (1), the first treatment method is to adopt conventional leaching wet process. The process adopts the "zinc concentrate fluidized furnace roasting desulfurization - zinc calcined sand neutral and low acid two-stage countercurrent leaching - supernatant solution purification electrowinning to produce zinc - low acid leaching slag reduction and volatilization recovery of zinc indium" wet zinc smelting process . Using this process, zinc and indium are effectively recovered, the recovery rate of zinc reaches 94%, and the recovery rate of indium reaches 75%. The waste residue in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/10C22B19/14C22B17/02C22B58/00
Inventor 袁铁锤李瑞迪
Owner CENT SOUTH UNIV
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