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High Iron zinc calcine process method

A treatment method, high-iron-zinc technology, applied in the field of zinc smelting, can solve the problems of resource waste, production cost not economically feasible, high equipment requirements, etc., achieve the effect of reducing production cost, having economic feasibility, and reducing material handling capacity

Active Publication Date: 2006-02-08
株洲冶炼集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art generally adopts neutral leaching, acid leaching, high-temperature high-acid leaching, pre-neutralization, iron removal, purification, and electrodeposition for treatment. This method has a long process flow and a large amount of leaching slag. The recovery of zinc in the form of zinc is generally about 6-8% in the slag, and the recovery rate of zinc is only 80%.
Moreover, lead in zinc mines, especially the expensive indium, has not been comprehensively recovered, resulting in serious waste of resources
On the other hand, because of the production conditions of high temperature and high acid, this method has high requirements on equipment, and its production cost is not economically feasible.
There are also other methods such as pyromethod clay kiln smelting zinc used by enterprises in related fields. The recovery rate of zinc is generally 80-90%, and the recovery rate of indium is only 30-40%. Due to serious environmental pollution, it has been banned from use.

Method used

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  • High Iron zinc calcine process method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The present invention is used to process the high-iron zinc calcined sand with the following weight percentages: Zn54.18%, Fe20.20%, In0.043%, Cu0.62%, Cd0.78%, and Pb3.21%. conduct:

[0039] Step 1: The high-iron zinc calcine is subjected to neutral leaching treatment in a conventional leaching equipment according to a conventional method, and the pH value is adjusted to 4.5. After using a filter press to obtain a neutral leachate and a neutral leach residue, the neutral leachate is pressed by The conventional method is to add zinc powder to purify and remove impurities, and then carry out electrowinning to obtain precipitated zinc flakes, which are then cast into molds to obtain products that meet the requirements of GB / T470-1997 for Zn99.995 zinc ingots;

[0040] Step 2: Mix the neutral leaching slag and coke powder obtained in step 1 in a weight ratio of 2:1, mix well, add to the ignited and heated Wei's furnace, blow in air, and raise the temperature to 1300 degree...

Embodiment 2

[0045]The processing composition of Example 1 is the following percentage by weight Zn54.18%, Fe20.20%, In0.043%, Cu0.62%, Cd0.78%, Pb3.21% high-iron zinc calcined sand, the difference is : in the step, the PH value is adjusted to 5.4; in the step 2, the neutral leaching slag is mixed with coal and limestone in a weight ratio of 2:1:0.2, and the coal used is coal with a calorific value of 23000kJ / kg, and the mixture is heated in the furnace Inner residence time is 5 hours, and gained metal oxide solid powder component is zinc 60.56%, lead 9.32%, indium 0.28%, and slag zinc content is 1.65%; In the step 4, sulfuric acid solution concentration is 1.9mol / l, and temperature is 80 degrees, the obtained acidic leaching residue contains 58.88% of lead sulfate; the indium content in the crude indium obtained in step 5 is 98.89%.

Embodiment 3

[0047] Processing composition is following percentage by weight Zn54.18% by embodiment 1, Fe20.20%, In0.043%, Cu0.62%Cd0.78%, the high-iron-zinc calcine of Pb3.21%, difference is:

[0048] In the step, the pH value is adjusted to 5; in step 2, the neutral leached slag is mixed with coke powder and limestone in a weight ratio of 4:1:1, the mixture stays in the furnace for 3 hours, and the temperature is raised to 1000 degrees, and the obtained metal The oxide solid powder component is 59.06% of zinc, 8.90% of lead, 0.27% of indium, and the zinc content of slag is 2.50%. The concentration of sulfuric acid solution in step 4 is 2.0mol / l, and the temperature is 70 degrees. Lead sulfate 58.70%; the indium content in the crude indium obtained in step 5 is 98.60%.

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Abstract

The invention relates to a method for smelting zinc, more specifically a method for processing zinc roasting-sand comprising the following steps, dissolving most of the easy-recovering, zinc oxide form zinc into solution through the conventional neutral extraction method, subjecting the neutral lixiviated slag to high-temperature volatilization processing, so as to separate zinc and ferrum, and as a result, the zinc oxide, lead oxide, and indium oxide can be separated in sequence.

Description

technical field [0001] The invention relates to a method for smelting zinc, in particular to a method for treating zinc calcined sand. Background technique [0002] The iron content of commonly used zinc ore is generally below 8%, and the existing production methods and equipment are all for processing raw materials that meet this standard to produce qualified zinc products. For zinc ores with an iron content of more than 8%, the iron content of the processed zinc calcine is generally greater than 10%, because of its high iron content, part of the zinc exists in the form of zinc ferrite, and this part of zinc exists in the form of zinc ferrite. It is difficult to be leached in the neutral leaching step, and it is difficult to be leached even in the steps of acid leaching and high-temperature high-acid leaching. The prior art generally adopts neutral leaching, acid leaching, high-temperature high-acid leaching, pre-neutralization, iron removal, purification, and electrodepos...

Claims

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Application Information

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IPC IPC(8): C22B19/00C22B3/04C22B13/00C22B58/00
CPCY02P10/20
Inventor 刘一宁陈雪云
Owner 株洲冶炼集团有限责任公司
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