Method for producing potassium chloride by using blast furnace dust of iron and steel enterprises

A blast furnace gas ash and potassium chloride technology, which is applied in the direction of alkali metal chloride and the like, can solve the problems of fluctuation of blast furnace conditions, decrease of collection and dust removal efficiency of sintering head electrostatic precipitator, and increase of sintered dust particle resistance, etc. The effect of reducing the harm to the environment

Active Publication Date: 2013-12-11
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A high content of alkali metal element compounds will increase the resistance of sintered dust particles with a submicron particle size structure, which will lead to a decrease in the collection and dust removal efficiency of the sintering head electrostatic precipitator and a deterioration of the operational stability of the dust removal device, which eventually manifests as sintering The concentration of smoke and dust emitted by the electrostatic precipitator at the machine head exceeds the standard and the operating energy consumption of the dust removal device increases
[0008] The gas ash is directly added to the iron ore as the blast furnace charge, a

Method used

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  • Method for producing potassium chloride by using blast furnace dust of iron and steel enterprises
  • Method for producing potassium chloride by using blast furnace dust of iron and steel enterprises
  • Method for producing potassium chloride by using blast furnace dust of iron and steel enterprises

Examples

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Embodiment 1

[0041] see figure 1 , 2, the method utilizing blast furnace gas ash of the present invention to produce potassium chloride, operation is as follows:

[0042] I) Mix gas ash and tap water at a ratio of 1:1, and perform pre-leaching for 0.5 hours. Then, the mixed solution in the pre-leaching process is sent to the leaching process, and the stirring and leaching is carried out at normal temperature, and the stirring and leaching time is 1 hour.

[0043] II) After the stirring time is reached, the mixed solution is sent to the primary filtration process for filtration, the primary filtrate is sent to the precipitation process for precipitation and impurity removal, and the primary filter residue is sent to the secondary leaching process for secondary leaching.

[0044] III) In the secondary leaching process, perform secondary leaching of the primary filter residue according to the solid-to-liquid ratio of 1:1, the leaching time is 1 hour, and then sen...

Embodiment 2

[0048] see figure 1 , 2, the method utilizing blast furnace gas ash of the present invention to produce potassium chloride, operation is as follows:

[0049] I) Mix gas ash and tap water at a ratio of 1:3, and pre-soak for 1 hour. Then the mixed solution in the pre-leaching process is sent to the leaching process, and the stirring and leaching is carried out at normal temperature, and the stirring and leaching time is 2 hours.

[0050] II) After the stirring time is reached, the mixed solution is sent to the primary filtration process for filtration, the primary filtrate is sent to the precipitation process for precipitation and impurity removal, and the primary filter residue is sent to the secondary leaching process for secondary leaching.

[0051] III) In the secondary leaching process, the primary filter residue is subjected to secondary leaching according to the solid-to-liquid ratio of 3:1. The leaching time is 2 hours, and then the mixed so...

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Abstract

The invention discloses a method for producing potassium chloride by using blast furnace dust of iron and steel enterprises. The method comprises the following steps: mixing the blast furnace dust with running water according to a certain ratio in a pre-leaching process; at the end of the mixing, stirring and leaching the mixed solution in a leaching process; filtering the mixed solution in a primary filtering procedure; removing impurities out of primary filtrate in a precipitating and impurity removing procedure; leaching the primary filter residue for the second time in a secondary leaching procedure; adding a precipitator to the primary filtrate in the precipitating procedure for precipitate and removing impurities; standing still for layering or filtering after completely precipitating; carry out multi-effect crystallization on clear liquid in an evaporation crystallization process to produce potassium chloride and sodium chloride products; filtering the mixed solution to secondary filtering equipment after the secondary leaching procedure reaches the filter condition; and recycling secondary filter residue for making iron, and returning the secondary filtrate to the pre-leaching process to be used again. By adopting the method, the high potassium feature in the blast furnace dust is fully utilized, waste materials are changed into valuable resources, the damage of emission of waste to the environment is reduced, and a high-quality potassium chloride product is also produced.

Description

technical field [0001] The invention relates to a method for producing potassium chloride, which is suitable for producing potassium chloride from blast furnace gas ash in iron and steel enterprises. Background technique [0002] During the blast furnace ironmaking process, the furnace dust is led out from the top of the furnace along with the blast furnace gas. After the coarse particles are removed in the gravity dust collector through the downcomer, the blast furnace gas is subjected to deep dust removal and purification treatment by the bag filter. The dust collected by the bag filter is called bag ash, and the dust collected by the gravity dust collector is called gravity ash. The two are collectively called gas ash. It is composed of boiling point non-ferrous metals (Pb, Zn) and their oxides, alkali metal oxides, etc. It is a light, fine-grained substance and is one of the main solid emissions from iron and steel enterprises. [0003] Gas ash contains iron, carbon ...

Claims

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Application Information

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IPC IPC(8): C01D3/04
Inventor 郭占成詹光
Owner UNIV OF SCI & TECH BEIJING
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