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Method of producing potassium chloride and co-producing calcium carbonate by utilizing cement kiln ash

A technology of cement kiln dust and calcium carbonate, applied in the direction of calcium carbonate/strontium/barium, alkali metal chloride, etc., can solve difficult problems such as treatment, achieve the effect of reducing environmental hazards and high added value of products

Active Publication Date: 2014-06-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the difficult problem of existing high-alkali cement kiln dust, and to provide a method for producing potassium chloride with cement kiln dust and co-producing high value-added spherical calcium carbonate

Method used

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  • Method of producing potassium chloride and co-producing calcium carbonate by utilizing cement kiln ash
  • Method of producing potassium chloride and co-producing calcium carbonate by utilizing cement kiln ash

Examples

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Effect test

Embodiment 1

[0035] see figure 1 , 2, utilize cement kiln dust of the present invention to produce the method for Repone K and co-production calcium carbonate, operate as follows:

[0036] I) Mix cement kiln dust with tap water at a ratio of 3:1 for 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.

[0037] II) After the stirring time is reached, the mixed solution is sent to the filtration process for filtration, the filtrate is sent to the calcium carbonate production process for calcium carbonate production, and the filter residue is sent to the cement production process for reuse.

[0038] III) After the filtrate enters the calcium carbonate production process, add sodium carbonate in an amount of 10g / L at room temperature to produce calcium carbonate for half an hour, and then carry out stati...

Embodiment 2

[0041] see figure 1 , 2, utilize cement kiln dust of the present invention to produce the method for Repone K and co-production calcium carbonate, operate as follows:

[0042] I) Mix cement kiln dust with 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.

[0043] II) After the stirring time is reached, the mixed solution is sent to the filtration process for filtration, the filtrate is sent to the calcium carbonate production process for calcium carbonate production, and the filter residue is sent to the cement production process for reuse.

[0044] III) After the filtrate enters the calcium carbonate production process, potassium carbonate is added in an amount of 2g / L at room temperature for precipitation and impurity removal. The time is half an hour, and ...

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Abstract

The invention discloses a method of producing potassium chloride and co-producing calcium carbonate by utilizing cement kiln ash and belongs to the field of inorganic chemistry. The method comprises the following steps: mixing the cement kiln ash and tap water according to a certain proportion in a pre-leaching process; at the end of mixing, feeding the mixed solution into a leaching process, stirring and leaching; feeding the mixed liquor into a filter process for filtering, recycling filter residues in a cement production process, and producing spherical calcium carbonate by using filtrate in a calcium carbonate production process; standing still for layering or filtering after the calcium carbonate is prepared completely; and feeding clear liquor into an evaporative crystallization process for multi-effect crystallization to produce potassium chloride and sodium chloride products. The method disclosed by the invention sufficiently utilizes high-potassium characteristic of the cement kiln ash, changes waste into things of value, reduces damages of waste emission to the environment, and produces high-quality potassium chloride and the spherical calcium carbonate product with a high additional value.

Description

[0001] technical field [0002] The invention relates to a method for producing potassium chloride and co-producing spherical calcium carbonate, which is suitable for producing potassium chloride and spherical calcium carbonate from cement kiln dust. Background technique [0003] When the rotary kiln is used to produce Portland cement clinker, the dust discharged into the kiln tail with the airflow, and the dry powder collected by the dust collection equipment is called the rotary kiln dust. It is a gray-yellow or gray-brown powder with strong hygroscopicity. Generally, when grinding cement, it is mixed into cement uniformly as a cement component with or without grinding. Raw materials such as shale for cement production contain a certain amount of potassium salts. These potassium salts volatilize into steam at high temperature in the kiln. When the steam flows to a place with a lower temperature, it condenses into liquid and adheres to the dust. Therefore, Kiln dust co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/04C01F11/18
Inventor 郭占成詹光
Owner UNIV OF SCI & TECH BEIJING