垃圾焚烧飞灰水洗液纯化及无机盐分离

Abstract

Abstract:

The heavy metals were removed by using different precipitating agents from waste incineration fly ash water wash-ing solution.Separation and recovery of inorganic salts in water washing solution after heavy metal removal were also carried out.The effects of types,additions of the inorganic and organic precipitants,and the combination of inorganic and organic pre-cipitant on the removal rate of the heavy metals were investigated.After purification,the washing liquid was evaporated and crystallized,and the purities of the inorganic salts separated at different boiling temperatures were analyzed.The experimental results showed that the removal efficiency of sodium sulfide was better than sodium carbonate,the total removal rate was 89.02% when the amount of substance ratio of sodium sulfide to heavy metal was 1.5.In organic precipitants TMT-102,MT-103 and RS-2568,MT-103 had the best removal efficiency,the total removal rate of heavy metal was 99.49% when the optimum addition was 400 mg/L.When combining the inorganic and organic precipitants,added sodium sulfide according to amount of substance ratio of sodium sulfide to heavy metal of 1.5,and then added MT-103 at the optimum dosage of 40 mg/L. The total removal rate of heavy metals could reach 99.60%.The inorganic chlorine salt in the purified fly ash water washing liquid was evaporated and separated.The first evaporation separation ended at boiling point temperature of 114 ℃.The salt slurry was purified at the temperature of not less than 80 ℃,and the purity of NaCl was over 95%.The mother liquor was evaporated to the boiling point at 126 ℃ and then cooled down.After the solid-liquid separation,the crude potassium was washed at the liquid solid ratio of 1.5,and the purity of KCl was above 96%.The mother liquor of CaCl₂ continued to evaporate,and when the temperature rose to 134 ℃,and the CaCl₂·6H₂O can be obtained by cooling crystallization.

Key words: waste incineration fly ash water washing solution, removal of heavy metals, evaporation separation, inorganic salt

CLC Number:

X799.3

Fan Qingling,Guo Xiaofu,Yuan Junsheng. Purification and inorganic salts separation of waste incineration fly ash water washing solution[J]. Inorganic Chemicals Industry, 2019, 51(3): 67-71.

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References 20

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Purification and inorganic salts separation of waste incineration fly ash water washing solution

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