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Method for treating zinc leaching residues

A technology of zinc leaching slag and weight percentage, which is applied in the field of chlorination roasting treatment of zinc leaching slag, can solve the problems of adverse effects of zinc, low iron yield, high zinc content, etc., and achieve the goals of reducing dosage, increasing air-fuel ratio, and reducing dosage Effect

Inactive Publication Date: 2017-07-07
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The advantage of the high-temperature reduction volatilization method is that lead, zinc, indium, etc. in the zinc leaching slag can be recovered at the same time, and all these elements can be collected into the zinc oxide dust. The zinc process is in a melt state, and a large amount of silicate is mixed in the melt, resulting in a low iron yield in the iron-containing slag
The advantage of the aqueous solution leaching method is that the iron content in the iron-containing slag after leaching reaches about 55%, but the zinc content in the slag is relatively high, and the zinc content is generally above 1%, because this part of zinc mainly exists in the form of zinc ferrite. When iron is used as a raw material for ironmaking, zinc can adversely affect the ironmaking process

Method used

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  • Method for treating zinc leaching residues

Examples

Experimental program
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Effect test

Embodiment 1

[0050] use figure 1 The process flow of the recovery of lead, zinc, indium, copper and iron in the zinc leaching slag, the composition and content of the zinc leaching slag are: total iron is 32.02wt%, zinc content is 17.52wt%, lead content is 4.23wt%, indium The content is 0.21wt%, the copper content is 1.5wt%, the size is broken to less than 200 mesh accounted for more than 80%, the chlorinating agent used is CaCl 2 , The particle size is between 200 mesh and 100 mesh, the addition amount is 10% of the zinc leaching residue, the reducing agent used is anthracite: fixed carbon 82.56%, volatile matter 6.49%, ash 10.02%, moisture 0.93%, sulfur 0.51%, add The amount is 5% of the zinc leaching slag, the binder used is starch solution, the added amount is 6% of the zinc leaching slag, the four are fully mixed and then pelletized, and then transferred to the rotary hearth furnace to control its chlorination The roasting and reduction process, the chlorination roasting and reduction ...

Embodiment 2

[0052] The method for treating zinc leaching slag in this implementation is the same as in Example 1, but the process parameters are different, as follows:

[0053] The composition and content of the zinc leaching slag used are: 35.72wt% of total iron, 16.97wt% of zinc, 3.94wt% of lead, 0.18wt% of indium, 1.8wt% of copper, and crushed particle size below 200 mesh More than 80%, the chlorinating agent used is CaCl 2 , The particle size is between 200 mesh and 100 mesh, the addition amount is 10% of the zinc leaching residue, the reducing agent used is anthracite: fixed carbon 82.56%, volatile matter 6.49%, ash 10.02%, moisture 0.93%, sulfur 0.51%, add The amount is 5% of the zinc leaching slag, the binder used is starch solution, the added amount is 6% of the zinc leaching slag, the four are fully mixed and then pelletized, and then transferred to the rotary hearth furnace to control its chlorination The roasting and reduction process, chlorination roasting and reduction process a...

Embodiment 3

[0055] The method for treating zinc leaching slag in this implementation is the same as in Example 1, but the process parameters are different, as follows:

[0056] The composition and content of the zinc leaching slag used are: total iron is 39.72wt%, zinc content is 19.97wt%, lead content is 4.94wt%, indium content is 0.25wt%, copper content is 2.0wt%, and the particle size is broken to below 200 mesh The chlorinating agent used is NaCl, the particle size is between 200 mesh and 100 mesh, the addition amount is 10% of the zinc leaching residue, and the reducing agent used is anthracite: fixed carbon 82.56%, volatile matter 6.49%, ash content 10.02%, moisture 0.93%, sulfur 0.51%, the addition amount is 15% of the zinc leaching slag, the binder used is starch solution, the addition amount is 6% of the zinc leaching slag, the four are fully mixed and then pelletized, then It is sent to the rotary hearth furnace to control its chlorination roasting and reduction process in sections...

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Abstract

The invention relates to a method for treating zinc leaching residues. The method is characterized by comprising the steps of 1 mixed pelletizing, wherein after the zinc leaching residues are crushed, a chlorinating agent, a reducing agent and a binding agent are added, the materials are mixed to be uniform, pelletizing is conducted in a disc-type pelletizing machine, and obtained carbon-containing pellets are conveyed to a rotary hearth furnace to participate in reacting after being dried; 2 chloridizing roasting and reducing, wherein segmented and zoned control is conducted on the temperature and the time in the chloridizing roasting and reducing process, so that the carbon-containing pellets are subjected to chloridizing roasting and reducing in the rotary hearth furnace, non-ferrous metals are recycled, and metallized pellets obtained after reacting are collected; 3 iron recycling, wherein grinding and magnetic separating are conducted on the metallized pellets, and recycled iron is obtained. According to the method for treating the zinc leaching residues, effective separation of lead, zinc, copper, indium and iron can be achieved; in addition, energy saving and consumption reducing are achieved, and the production cost is reduced.

Description

Technical field [0001] The invention belongs to the field of metallurgy and energy, and particularly relates to a method for treating zinc leaching slag by chlorination roasting. Background technique [0002] my country's zinc smelting technology is dominated by wet smelting. According to the different iron removal technology of leaching solution, it can be divided into goethite method, hematite method and jarosite method. Among them, the jarosite method is the most widely used because of its easy precipitation, low solubility, good filterability, low reagent consumption and low production cost. The jarosite precipitation process is to selectively precipitate the iron element in the zinc leaching solution, so as to achieve the ultimate goal of separating iron and zinc. However, in addition to the formation of vitriol during the alum precipitation process, a part of the valuable metals such as zinc, lead, and silver enter the vitriol slag together with the vitriol in the form of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244C22B1/08C22B7/00C22B13/02C22B19/30C22B15/00C22B58/00
CPCC22B1/08C22B1/2406C22B1/244C22B7/001C22B13/025C22B15/0054C22B19/30C22B58/00Y02P10/20
Inventor 王福佳古明远王敏吴佩佩王键月吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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