Method for removing potassium chloride in bricks used for cement kiln

A cement kiln and potassium chloride technology, which is applied in the field of removing potassium chloride from bricks used in cement kilns, can solve the problems of unsuitable potassium chloride removal treatment and complex process, and achieve low treatment cost, simple treatment process, and solution The effect of polluting the environment

Active Publication Date: 2021-04-27
UNIV OF SCI & TECH LIAONING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] "A Method for Extracting Potassium Chloride from Sintered Ash" mentions that the leaching solution prepared by the leaching modifier can be used to extract potassium chloride, but the preparation of the solution The process is complicated, and the solution contains a large amount of metal salts, which is not suitable for the removal of potassium chloride in bricks after cement kiln use

Method used

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  • Method for removing potassium chloride in bricks used for cement kiln
  • Method for removing potassium chloride in bricks used for cement kiln

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Experimental program
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Effect test

Embodiment 1

[0020] A method for removing potassium chloride in cement kiln bricks, the method may further comprise the steps:

[0021] (1) Remove the metamorphic layer on the surface of cement kiln bricks (periclase-aluminum spinel bricks for firing zone) by manual selection, and coarsely crush the selected cement kiln bricks to 10-20mm, and then crushed to <0.5mm by a cone crusher or a double-roll crusher, and then ground to 0.074-0.044mm by a vertical mill to make a powder (potassium chloride content 3.47%, magnesium oxide content 81.50%);

[0022] (2) At room temperature, 0.05-1mol / L nitric acid (0.05mol / L nitric acid 2kg), 0.05-1mol / L organic acid (0.15mol / L citric acid 3kg) are formulated into a compound acid solution according to a mass ratio of 1:1.5;

[0023] (3) After mixing the powder obtained in step (1) and the compound acid solution prepared in step (2) according to the mass ratio of 1:2 (2.5kg of powder, 5kg of compound acid solution), soak at 25°C for 24 hour, the mixture...

Embodiment 2

[0027] Step (1) is with embodiment 1;

[0028] (2) At room temperature, mix 0.05-1mol / L nitric acid (0.5mol / L nitric acid 1kg), 0.05-1mol / L organic acid (0.5mol / L citric acid 5kg, 0.1mol / L tartaric acid solution 2kg) according to mass ratio 1: 7 is prepared into compound acid solution;

[0029] (3) After mixing the powder obtained in step (1) and the compound acid solution configured in step (2) according to the mass ratio of 1:3.2 (2.5kg of powder, 8kg of compound acid solution), soak at 25°C for 24 hour, the mixture was obtained;

[0030] (4) The supernatant liquid of the mixed solution obtained in step (3) is removed, and the sediment is repeatedly rinsed and filtered 3 times (15kg water) with tap water, and the sediment after filtering is at 110° C. Dry for 24 hours to obtain fine powder of regenerated multiphase magnesia.

[0031] The content of potassium chloride in the sample is detected by X-ray fluorescence to be 0.021%, the content of magnesium oxide is 84.24%, an...

Embodiment 3

[0033] Step (1) is with embodiment 1;

[0034] (2) Mix 0.05-1mol / L nitric acid (1mol / L nitric acid 2kg), 0.05-1mol / L organic acid (1mol / L citric acid 5kg, 1mol / L malic acid 1.5kg and 0.5mol / L tartaric acid 1.5kg) at room temperature ) is mixed with compound acid solution according to the mass ratio of 1:4;

[0035] (3) After mixing the powder obtained in step (1) and the compound acid solution prepared in step (2) according to the mass ratio of 1:4 (2.5kg of powder, 10kg of compound acid solution), soak at 25°C for 24 hour, the mixture was obtained;

[0036] (4) The supernatant liquid of the mixed solution obtained in step (3) is removed, and the sediment is repeatedly rinsed and filtered 5 times (20kg water) with tap water, and the sediment after filtration is at 110°C in a drying kiln or an oven. Dry for 12 hours to obtain fine powder of regenerated multiphase magnesia.

[0037] The content of potassium chloride in the sample is detected by X-ray fluorescence to be 0.014%...

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Abstract

The invention discloses a method for removing potassium chloride in a used brick of a cement kiln, the implementation process of the method comprises the steps of pulverizing, preparing a composite acid solution, soaking, filtering, drying and the like, and the highest removal rate of the potassium chloride can reach 99.856%. The adopted reagent raw materials are low in price, the treatment process is simple, the potassium chloride in the used brick of the cement kiln can be removed only through soaking and filtering, the potassium chloride removal efficiency is high, the treatment cost is low, and industrial application is easy to achieve. The content of potassium chloride in the finally obtained regenerated complex-phase magnesia fine powder is only 0.005%, and the regenerated complex-phase magnesia fine powder can be used as a production raw material of building materials or refractory materials, so that sustainable utilization of non-renewable resource magnesia is realized, the problem of environmental pollution caused by stacking of bricks used in a cement kiln is effectively solved, and remarkable economic and social benefits can be generated.

Description

technical field [0001] The invention belongs to the technical field of processing and reusing used refractory materials, and in particular relates to a method for removing potassium chloride from bricks used in cement kilns. Background technique [0002] China is a big country in cement production. In 2018, it produced 2.21 billion tons of cement, accounting for 56% of the world's total output. During the cement production process, a large amount of post-consumer refractory materials will be produced, and post-use bricks in cement kilns are one of them. Due to the presence of potassium chloride in bricks used in cement kilns, their direct reuse has problems such as low refractory load softening temperature, poor high-temperature creep performance, "hot brittleness" and low service life. At present, the treatment methods of bricks used in cement kilns are mainly landfill or discarded randomly, which not only pollutes the environment, but also wastes non-renewable resources su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/626C04B35/04
CPCC04B35/66C04B35/62605C04B35/62204C04B35/04
Inventor 田琳贾小东毛硕谢永涣李国华
Owner UNIV OF SCI & TECH LIAONING
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