氨碱盐泥碳化反应宏观动力学研究

doi:10.19964/j.issn.1006-4990.2021-0580

Abstract

Abstract:

Salt sludge is the waste discharged from the refined brine process during the production of soda，its effective components is mainly Mg（OH）₂，CaSO₄，CaCO₃，NaCl，etc.In the world，about 55 million tons of salt sludge is produced every year，and its comprehensive utilization techniques has become an urgent problem to be solved by soda production enterprises.A carbonization method was proposed to separate calcium and magnesium from salt sludge and convert them into calcium carbonate and magnesium sulfate products.The effect of solid-liquid ratio，reaction temperature，salt sludge particle size on magnesium extraction rate was researched.The results showed that with the decrease of solid?liquid ratio，the size of salt sludge particles and the increase of reaction temperature，the extraction rate of magnesium was gradually increased. It was found that the extraction rate of magnesium in salt sludge reached 96.04% under the conditions of solid?liquid ratio（g/mL） of 1∶10，reaction temperature of 50 ℃ and salt sludge particle size of ≤75 μm.The shrinking core model was used for fitting，and the carbonization process could be fitted the shrinking core model with constant particle size.The results showed that the rate controlling step of salt sludge on carbon dioxide absorption process was magnesium hydroxide dissolu?

tion control，and the activation energy was 24.22 kJ/mol.This research could provide basic theory for the scale?up of salt sludge carbonization reactors.

Key words: ammonia alkali salt sludge, carbonization, macro kinetics, activation energy

CLC Number:

TQ132.2

ZHANG Shaokang,ZHAO Hua,LIU Runjing. Study on macro?kinetics of carbonization reaction of ammonia alkali salt sludge[J]. Inorganic Chemicals Industry, 2022, 54(6): 120-124.

Figures/Tables 10

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Table 1

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Table 3

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动力学控制步骤	颗粒大小不变	颗粒缩小
外扩散控制	η=k₁t①	1-（1-η）^2/3=k₄t④
化学反应控制	1-（1-η）^1/3=k₂t②
内扩散控制	1-3（1-η）^2/3+2（1-η）=k₃t③

方程	R²
方程	20 ℃	40 ℃	50 ℃	60 ℃	80 ℃
①	0.923 1	0.924 4	0.924 6	0.923 2	0.921 1
②	0.965 4	0.966 2	0.968 9	0.967 5	0.967 1
③	0.992 7	0.993 9	0.997 3	0.992 6	0.995 6
④	0.969 5	0.972 1	0.969 7	0.961 1	0.971 6

模型	温度/℃	R²	k
③	20	0.992 7	0.005 3
	40	0.993 9	0.008 4
	50	0.997 3	0.012 2
	60	0.992 6	0.013 8
	80	0.995 6	0.017 2

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National Inorganic Salts Information Center

Inorganic Acid-Base-Salt Committee of CIESC

Study on macro?kinetics of carbonization reaction of ammonia alkali salt sludge

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