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High-iron zinc leaching residue clean utilization method

A high-iron zinc and leaching slag technology, which is applied in the field of dressing and smelting, can solve the problems of difficult recovery of valuable metals and high recovery costs, and achieve the effects of eliminating environmental pollution, improving comprehensive grade and recovery rate, and efficient recovery

Inactive Publication Date: 2017-08-04
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at a series of problems such as the environmental pollution caused by a large amount of high-iron zinc leaching slag produced in the process of hydrometallurgy, the high cost of recovery by wet or fire methods, and the difficulty in recovering valuable metals by conventional beneficiation methods, the present invention aims to provide a High-value and clean utilization method of high-iron-zinc leaching slag. In this method, the material is firstly dehydrated and dried, and then the lead-zinc sulfate in the slag is selectively converted into artificial sulfide ore under a carbon-sulfur mixed atmosphere. Realize the sulfide of copper, bismuth and silver and the magnetization transformation of zinc ferrite, and then use the floating-magnetic joint process to obtain artificial sulfide ore and high-purity zinc ferrite concentrate respectively. The former can be sold directly as zinc concentrate, and the latter can be sold after reduction and volatilization. Obtain indium-containing zinc products and high-grade ironmaking materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Such as figure 1 Shown, this high-iron zinc leaching slag cleaning utilization method, its specific steps are as follows:

[0054] (1) First, the high-iron zinc leaching slag (the content of copper and bismuth in the high-iron zinc leaching slag is very low, and its chemical composition is: Pb3.4%, Zn16.5%, Fe21.5%, Ag272.3g / t, In278.5g / t, the chemical phase of lead is PbSO 4 76%, PbS8%, other 16%, the chemical phase of zinc is: ZnSO 4 38.6%, ZnFe 2 o 4 58.3%, the other 3.1%, the chemical phase of silver is: Ag 2 O18.6%, AgS74.4%, other 7%) drying and dehydration, and then add reducing agent (carbon powder, the addition amount is 12% of the mass of high-iron zinc leaching slag) and vulcanizing agent (sodium sulfide, the addition amount is high-iron zinc leaching 1% of slag mass), roasted in a carbon-sulfur mixed atmosphere at a temperature of 750 °C for 1.5 h, after the roasting was completed, nitrogen or argon was introduced as a protective gas, and slowly cooled ...

Embodiment 2

[0059] Such as figure 1 Shown, this high-iron zinc leaching slag cleaning utilization method, its specific steps are as follows:

[0060] (1) First, the high-iron zinc leaching slag (its chemical composition is: Pb2.3%, Zn14.4%, Fe19.8%, Ag389.6g / t, Cu1.4%, In278.5g / t and Bi0.96 %, the chemical phase of lead is PbSO 4 68.9%, PbS12%, other 9.1%, the chemical phase of zinc is: ZnSO 4 42.5%, ZnFe 2 o 4 53.8%, the other 3.7%, the chemical phase of silver is: Ag 2 O13.8%, AgS71.2%, other 15%, copper chemical phase: CuO84.2%, CuS13.9%, other 1.9%, bismuth chemical phase: BiO76.2%, BiS21.3 %, other 2.5%) drying and dehydration, and then add reducing agent and vulcanizing agent at the same time (both reducing agent and vulcanizing agent are high-sulfur coal, the carbon content in high-sulfur coal is 80wt%, sulfur content is 5.5wt%, and the addition amount is high-iron-zinc The quality of leaching residue is 14.5%), roasting in a carbon-sulfur mixed atmosphere at a temperature of...

Embodiment 3

[0065] Such as figure 1 Shown, this high-iron zinc leaching slag cleaning utilization method, its specific steps are as follows:

[0066] (1) First, the high-iron zinc leaching slag (its chemical composition is: Pb3.4%, Zn10%, Fe25%, Ag350g / t, Cu2.4%, In450g / t and Bi1.8%, the chemical phase of lead is PbSO 4 72.5%, PbS2.5%, other 25%, the chemical phase of zinc is: ZnSO 4 38.5%, ZnFe 2 o 4 55.2%, the other 6.3%, the chemical phase of silver is: Ag 2 O21.5%, AgS74.5%, other 4%, copper chemical phase: CuO78.5%, CuS14.5%, other 7%, bismuth chemical phase: BiO68.4%, BiS19.6 %, other 12%) drying and dehydration, and then add a reducing agent at the same time (the reducing agent is a mixed gas reducing agent of carbon monoxide and producer gas with a volume ratio of 1:1, the amount of the reducing agent is 2L / min unit, the gas reducing agent Containing CO volume concentration 50%, H 2 The volume concentration is 12%, and the rest is N 2 ) and vulcanizing agent (the vulcanizi...

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Abstract

The invention relates to a high-iron zinc leaching residue clean utilization method, and belongs to the technical field of beneficiation and metallurgy. Firstly, high-iron zinc leaching residues are dried and dehydrated, then a reducing agent and a vulcanizing agent are added at the same time, carbon-sulphur mixed atmosphere roasting is carried out under the condition that the temperatre ranges from 400 DEG C to 900 DEG C for 0.5 h to 3.5 h, nitrogen or argon is led in to serve as protection gas after roasting is finished, slow cooling is carried out with the speed ranging from 150 DEG C / h to 300 DEG C / h, and water quenching is carried out after the temperature drops to 200 DEG C or below to obtain water-quenched slag; the obtained water-quenched slag is subject to conventional flotation treatment to obtain man-made sulphide concentrate and nonfloat; and the obtained nonfloat is subject to conventional strong magnetism separation to obtain zinc-iron oxide concentrates, a gaseous reducing agent is led into the zinc-iron oxide concentrates, a reduction volatilization reaction is made at the temperature ranging from 950 DEG C to 1300 DEG C for 1.0 h to 4.0 h, after reduction volatilization is finished, volatilizing gas is recovered to obtain an indium-contained zinc product, and solid left after volatilization is cooled to obtain an iron product. The high-iron zinc leaching residue clean utilization method is a new high-valued and clean technology which can efficiently recover valuable metal elements such as copper, lead, zinc, indium and silver and is free of generation of iron slag.

Description

technical field [0001] The invention relates to a method for cleaning and utilizing high-iron zinc leaching slag, which belongs to the technical field of dressing and smelting. Background technique [0002] High-iron-zinc leaching slag is an intermediate material obtained after boiling-roasting-two-stage leaching process of high-iron-zinc concentrate. Its high-value and clean utilization has always been a difficult problem to be solved in the metallurgical industry at home and abroad. [0003] In the zinc smelting process, since the zinc concentrate is often associated with about 10% iron element, in order to achieve the ideal desulfurization rate during the roasting process, zinc ferrite is inevitably produced in the zinc calcine, and the zinc content in zinc ferrite accounts for the total 8%~10% of the zinc content. When the zinc concentrate is a high-iron material (≥10%) or sphalerite that exists in large quantities in my country, the content of zinc ferrite in the calci...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B1/02C22B1/26C22B19/30C22B11/02C22B13/02C22B15/00C22B30/06C22B58/00
CPCC22B1/02C22B1/26C22B7/001C22B7/002C22B11/021C22B13/025C22B15/0026C22B19/30C22B30/06C22B58/00Y02P10/20
Inventor 郑永兴王华文书明吕晋芳蓝卓越杨春曦赖振宁
Owner KUNMING UNIV OF SCI & TECH
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