Chemical deashing method for coal
A deashing and chemical technology, applied in the direction of chemical instruments and methods, separation methods, calcium/strontium/barium halides, etc., can solve the problems of large loss of raw materials, limited application range, increased energy consumption, etc., to reduce environmental pollution , good deashing effect and improved deashing efficiency
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Embodiment 1
[0022] A chemical deashing method for coal, which adopts the steps of: deashing coal with ash with a particle size of 1-5 mm and an ash content of 4.9% and a deashing solution at a temperature of 10 DEG C for acid leaching reaction deashing, and the reaction time is: For 4 hours, the deashing solution was a mixed acid of hydrofluoric acid and hydrochloric acid, wherein the content of hydrofluoric acid was 5%, and the content of hydrochloric acid was 10%. After the acid leaching reaction, the deashed product was separated from the solution to obtain the deashed product and the waste mixed acid solution. , After drying the deashed product, the deashed product is defluorinated in the calciner. At the same time, the lime solution is used to absorb the waste gas of the calciner. After the deashed waste mixed acid is reused repeatedly, lime is added for treatment, and calcium fluoride is extracted and filtered. , After the washing water is classified and reused, lime is added for tre...
Embodiment 2
[0024] A chemical deashing method for coal, which adopts the steps of: deashing coal with ash with a particle size of 1-5 mm and an ash content of 4.9% and a deashing solution at a temperature of 80 DEG C for acid leaching reaction deashing, and the reaction time is: After 24 hours, the deashing solution is a mixed acid of hydrofluoric acid and hydrochloric acid, wherein the content of hydrofluoric acid is 30% and the content of hydrochloric acid is 40%. After the acid leaching reaction, the deashing product and the solution are separated to obtain the deashing product and the waste mixed acid solution. , After drying the deashed product, the deashed product is defluorinated in the calciner. At the same time, the lime solution is used to absorb the waste gas of the calciner. After the deashed waste mixed acid is reused repeatedly, lime is added for treatment, and calcium fluoride is extracted and filtered. , After the washing water is classified and reused, lime is added for tr...
Embodiment 3
[0026] A chemical deashing method for coal, which adopts the steps of: deashing coal with ash with a particle size of 1-5 mm and an ash content of 4.9% and a deashing solution at a temperature of 60 DEG C for acid leaching reaction deashing, and the reaction time is: After 12 hours, the deashing solution is a mixed acid of hydrofluoric acid and hydrochloric acid, wherein the content of hydrofluoric acid is 15%, and the content of hydrochloric acid is 20%. After the acid leaching reaction, the deashed product and the solution are separated to obtain the deashed product and the waste mixed acid solution. , After drying the deashed product, the deashed product is defluorinated in the calciner. At the same time, the lime solution is used to absorb the waste gas of the calciner. After the deashed waste mixed acid is reused repeatedly, lime is added for treatment, and calcium fluoride is extracted and filtered. , After the washing water is classified and reused, lime is added for tre...
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