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Method for efficiently fully leaching zinc from dust caused by making steel from waste galvanized plates

A technology for leaching and fumes, which is applied in the field of efficiently and fully leaching zinc from waste galvanized steelmaking fumes, can solve the problems of increased processing costs, low leaching efficiency, waste of zinc resources, etc., and achieves cost savings, quick results, and initial investment little effect

Inactive Publication Date: 2014-07-09
有研资源环境技术研究院(北京)有限公司
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Problems solved by technology

The traditional two-stage leaching wet process has a good leaching and recovery effect on the fume mainly composed of zinc oxide, but the leaching efficiency is low for the fume mainly composed of zinc ferrite, resulting in the waste of a large amount of zinc resources
While zinc ferrite dust is leached with high temperature and high acid, although the leaching efficiency is increased, the leaching solution contains high impurities such as residual acid and iron ions, which greatly increases the subsequent treatment cost

Method used

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  • Method for efficiently fully leaching zinc from dust caused by making steel from waste galvanized plates

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Embodiment 1

[0047] This process is used to treat waste galvanized sheet steelmaking smoke and dust in a steel factory in Suzhou. Due to the difference of raw materials into the furnace, the soot is mainly composed of zinc oxide, containing about 10% zinc and about 15% iron; or mainly zinc ferrite, containing about 20% zinc and about 22% iron. It is -0.074mm87%.

[0048] Using the traditional room temperature leaching process, the leaching rate of zinc oxide soot is about 90%; however, the leaching rate of zinc ferrite soot is only 50%, resulting in a large waste of resources. Using high-temperature concentrated acid leaching to treat zinc ferrite fume, the leaching rate can reach 90%, but the leaching solution contains a large amount of residual acid and iron ions, not only the waste of sulfuric acid is large, but also the cost of subsequent iron removal treatment is high, making it difficult to make profits.

[0049] Adopt the inventive method to process this flue dust:

[0050] (1) Ne...

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Abstract

A method for efficiently fully leaching zinc from dust caused by making steel from waste galvanized plates comprises the following steps: (1) performing normal-temperature neutral leaching on zinc oxide dust to obtain a neutral leaching liquid and a neutral leaching slag; (2) performing high-temperature concentrated-acid leaching on zinc ferrite dust to obtain a high-temperature concentrated-acid leaching liquid and a high-temperature concentrated-acid leaching slag; (3) employing the high-temperature concentrated-acid leaching liquid as a leaching reagent to perform normal-temperature acidic leaching on the neutral leaching slag; and (4) employing the normal-temperature acidic leaching liquid as a leaching reagent to performing normal-temperature neutral leaching to obtain a neutral leaching liquid which is a finished product liquid. The method is easy to perform and easy for commissioning; and after the technology is modified, spent acid is fully utilized when the zinc source is effectively recovered, and also the iron ion content in the leaching liquid is reduced, so that the subsequent iron-removing processing cost is greatly saved.

Description

technical field [0001] The invention relates to a new method for efficiently and fully leaching zinc in waste galvanized sheet steelmaking dust, which improves the traditional wet leaching process. Background technique [0002] Using waste galvanized steel to make steel, every ton of steel produced will produce 10~20kg of smoke and dust, of which the zinc content is about 10~25%. According to the steelmaking process adopted and the raw materials into the furnace, the zinc in the dust exists in the form of zinc oxide or zinc oxide (hereinafter referred to as zinc oxide dust), or in the form of zinc ferrite (hereinafter referred to as zinc ferrite dust). The traditional two-stage leaching wet process has a good leaching and recovery effect on the dust mainly composed of zinc oxide, but the leaching efficiency is low for the dust mainly composed of zinc ferrite, resulting in a waste of a large amount of zinc resources. While leaching zinc ferrite fumes with high temperature an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B19/30C22B3/06C22B3/04
CPCY02P10/20
Inventor 李岩徐政杨丽梅王巍
Owner 有研资源环境技术研究院(北京)有限公司
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