Method for extracting potassium chloride from sintering dust in iron and steel enterprises

A potassium chloride, enterprise technology, applied in the direction of alkali metal chloride, etc., can solve the problems of long operation process, low recovery rate, secondary pollution, etc., and achieve the effects of being conducive to recovery, less impurity metal elements, and low energy consumption

Inactive Publication Date: 2016-07-20
WUHAN GREAT SEA HI TECH
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[0006] The purpose of the present invention is to provide a method for extracting potassium chloride from sintering dust in iron and steel enter

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  • Method for extracting potassium chloride from sintering dust in iron and steel enterprises

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Embodiment Construction

[0019] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0020] refer to figure 1 As shown, the invention discloses a method for extracting potassium chloride from sintering dust of iron and steel enterprises, comprising the following steps

[0021] a) Leaching: Fully stir groundwater with a liquid-solid ratio of 3:1-2:1 and sintering dust for 0.5-1h under normal temperature and pressure conditions, and the leaching rate can reach more than 95%. After the leaching is completed, the formed slurry sent to the mechanical filter press unit.

[0022] b) Mechanical filter press: The mechanical press filter unit separates the slurry from solid to liquid, the leached residue is dried and then returned to the sintering process, the leachate is leached again, and the leachate enters the membrane impurity removal unit, and the leachate contains a small amount of impurity metal ions, such as Fe 3+ , Ca 2+ , Mg 2+ , Zn 2+ ...

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Abstract

The invention discloses a method for extracting potassium chloride from sintering dust in iron and steel enterprises. The method comprises the following steps: fully stirring a leaching solution and sintering dust under normal temperature and normal pressure conditions for 0.5-1 hour, conveying the formed slurry to a mechanical filter pressing unit after completion of leaching, performing solid-liquid separation on the slurry through the mechanical filter pressing unit, drying the leaching residues, returning to a sintering process, leaching the leaching solution again, allowing the leaching solution to enter a membrane process impurity removal unit, conveying the leaching solution to a quartz sand filter through a pump, filtering to remove particles in the liquid, performing micro-filtration treatment, and removing colloid in the liquid; finally, realizing separation of multivalent metallic impurities and potassium through nanofiltration, so as to obtain a refined potassium-containing pregnant solution, allowing the refined potassium-containing pregnant solution to enter a membrane distillation and crystallization unit, concentrating the potassium-containing pregnant solution by utilizing a low-temperature heat source of the iron and steel enterprises, cooling, so as to obtain a potassium chloride crystal. The method disclosed by the invention is simple in process, high in degree of automation and low in energy consumption, wastewater emission is avoided, and comprehensive utilization of harmful solid wastes in the iron and steel enterprises is realized.

Description

technical field [0001] The invention belongs to the technical field of solid waste resource treatment, and in particular relates to a method for extracting potassium chloride from sintering dust in iron and steel enterprises. Background technique [0002] In response to the State Council's call for energy conservation, emission reduction and clean production, since 1997, my country's iron and steel enterprises have successively completed flue gas and dust removal renovation projects, which have alleviated the air pollution of iron and steel enterprises. Since the "Thirteenth Five-Year Plan" of the country, it has been clearly stipulated that the concentration control of smoke and dust should be changed to a more stringent total control, and the total amount of sintering dust removal is on the rise. The collected sintering dust contains many harmful factors such as potassium, sodium and zinc, etc., because it is rich in sodium and potassium salts that are easily soluble in wa...

Claims

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Application Information

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IPC IPC(8): C01D3/04
CPCC01D3/04C01P2004/61C01P2006/80
Inventor 李海港夏焕锦梅映新陈勇汪阳卿孙攀殷浩
Owner WUHAN GREAT SEA HI TECH
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