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Method for recycling iron, indium and tine in zinc volatilizing kiln slag

A technology of zinc volatilization and kiln slag, applied in the field of comprehensive utilization of resources, can solve the problems of large corrosion of equipment, low utilization value of iron concentrate and copper concentrate, inability to achieve effective recovery of valuable metals, etc., and achieve comprehensive metal recovery rate. High, improve the comprehensive utilization rate, the effect of large-scale industrial application prospects

Active Publication Date: 2013-12-11
ZHAOQING FEINAN METAL
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the utilization value of the iron concentrate and copper concentrate obtained by this process is not great, that is, the direct beneficiation method cannot realize the effective recovery of many valuable metals.
[0005] Pure metallurgical methods such as blast furnace smelting, reduction vulcanization and enhanced smelting can realize the recovery of multiple elements in zinc volatilization kiln slag, but such processes generally have long process flow, high energy consumption and SO 2 It is difficult to popularize and apply in industry due to problems such as smoke pollution
The molten chlorination volatilization method for zinc volatilization kiln slag has the advantages of self-heating and high enrichment ratio of valuable elements in the dust, but the volatilization rate of zinc and copper in the slag is relatively low, and the process has great corrosion on equipment, so it is difficult to Industrial promotion and application

Method used

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  • Method for recycling iron, indium and tine in zinc volatilizing kiln slag
  • Method for recycling iron, indium and tine in zinc volatilizing kiln slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) Assuming that the reducing agent is 20% of the mass of the zinc volatilization kiln slag, mix the zinc volatilization kiln slag and pulverized coal evenly, put it into the rotary kiln, heat up to 1000°C for reduction roasting, and keep it warm for 180 minutes, and capture The flue gas produced in the process; the flue gas contains metal indium and tin dioxide, both of which can be recovered by conventional methods; at this reduction temperature, the copper-containing particles in the zinc volatilization kiln slag aggregate and grow up, realizing the copper , The effective separation of the iron phase is conducive to the recovery of iron in the next step, and most of the iron phase is reduced to metallic iron during the process;

[0028] (2) Step (1) After the heat preservation is completed, pass oxygen into the rotary kiln at a flow rate of 0.05L / min, continue to heat at 1000°C for 100min, and capture the flue gas generated during the process; the valuable components...

Embodiment 2

[0032] (1) According to the reducing agent being 25% of the mass of the zinc volatilization kiln slag, mix the pulverized coal evenly and put it into the rotary kiln, heat up to 1100°C for reduction roasting, and keep it warm for 150 minutes, and at the same time capture the flue gas generated during the process ; The flue gas contains metal indium and tin dioxide, both of which can be recovered by conventional methods; at this reduction temperature, the copper-containing particles in the zinc volatilization kiln slag aggregate and grow up, realizing the effective separation of copper and iron phases. Separation is beneficial to the recovery of iron in the next step. During the process, most of the iron phase is reduced to metallic iron;

[0033] (2) Step (1) After the heat preservation is completed, feed oxygen into the rotary kiln at a flow rate of 0.05L / min, continue to heat at 1100°C for 95 minutes, and capture the flue gas generated during the process; the valuable compone...

Embodiment 3

[0037] (1) Assuming that the reducing agent is 30% of the mass of the zinc volatilization kiln slag, mix the zinc volatilization kiln slag and pulverized coal evenly, put it into the rotary kiln, raise the temperature to 1150°C for reduction roasting, and keep it warm for 150 minutes, and capture The flue gas produced in the process; the flue gas contains metal indium and tin dioxide, both of which can be recovered by conventional methods; at this reduction temperature, the copper-containing particles in the zinc volatilization kiln slag aggregate and grow up, realizing the copper , The effective separation of the iron phase is conducive to the recovery of iron in the next step, and most of the iron phase is reduced to metallic iron during the process;

[0038](2) Step (1) After the heat preservation is completed, feed oxygen into the rotary kiln at a flow rate of 0.2L / min, continue to heat at 1150°C for 100min, and capture the flue gas generated during the process; the valuabl...

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Abstract

The invention provides a method for recycling iron, indium and tine in zinc volatilizing kiln slag. The method comprises the following steps: uniformly mixing zinc volatilizing kiln slag and a reducing agent, subsequently feeding the mixture into a rotary furnace to carry out reduction roasting, and at the same time capturing fume generated in the process; furthermore feeding oxidation gas into the rotary furnace, carrying out magnetic roasting and capturing the fume generated in the process at the same time; carrying out air-cooling on remaining materials inside the rotary furnace, grinding ore, and subsequently carrying out low intensity magnetic separation so as to obtain magnetite concentrate. The effective recycling of iron in the kiln slag is realized through the steps, and tail slag contains copper. The recycling rates of the iron, the indium and the zinc can be respectively 75-85%, 85-93% and 86-95%; through low intensity magnetic separation, the iron grade of the iron concentrate is improved while ensuring the recycling rate of the iron, the effective recycling of an iron resource is achieved, and the iron grade of the iron concentrate is improved to be 70-75% finally; the process is short, the operation is simple and feasible, economic cost is low and metal comprehensive recycling rate is high, a conventional process order of separation-first and smelting-later is broken, and the comprehensive utilization rate of a secondary resource is improved.

Description

technical field [0001] The invention relates to a method for recovering iron, indium and tin in the kiln slag of a zinc volatilization kiln, which is smelted first and then roasted in two stages, and belongs to the technical field of comprehensive utilization of resources. Background technique [0002] Zinc volatilization kiln slag is the leaching slag of wet zinc smelting and added with 40-50% coke powder. It is the residue after extracting metals such as zinc and lead at high temperature in the rotary kiln. The volatilization kiln slag produced often contains Higher valuable metals such as Cu, In, Fe, etc., the comprehensive utilization of resources is of great value. Realizing its effective utilization can reduce environmental pollution, and at the same time, it is of great significance to study new technologies for the separation of valuable metals. [0003] At present, the effective utilization methods of zinc volatilization kiln slag are mainly ore dressing method, bl...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B25/06C22B25/02C22B58/00B03C1/015
CPCY02P10/20
Inventor 张仁杰李磊王华邱在军廖彬
Owner ZHAOQING FEINAN METAL
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