Inorganic Chemicals Industry >
Study on removal process of total organic carbon from industrial waste salts by pyrolysis
Received date: 2024-03-05
Online published: 2024-11-05
Highly efficient and low⁃cost removal of total organic carbon（TOC） from waste salt is an important pretreatment method in achieving salt resource utilization.This study focused on the high⁃temperature pyrolysis process of two representative industrial waste salts（sodium chloride and sodium sulfate）.The results showed that under the condition of 350 ℃ and a stacking thickness of 12.5 mm，sodium chloride underwent pyrolysis for 60 min，the TOC removal rate was 94%.Under the condition of 450 ℃ and a stacking thickness of 18.5 mm，the pyrolysis time of high sodium sulfate was 40 min，the TOC removal rate was 94.2%.Before pyrolysis，7.5 mL/kg hydrogen peroxide was added to high sodium chloride.The TOC removal rate during 250 ℃ pyrolysis was comparable to that at 350 ℃ without hydrogen peroxide.After adding 10 mL/kg hydrogen peroxide to high sodium sulfate，the TOC removal rate during 350 ℃ pyrolysis was comparable to that at 450 ℃ without hydrogen peroxide.The pyrolysis temperature of both waste salts was reduced by 100 ℃ after using advanced oxidation synergistic pyrolysis，and the energy⁃saving effect was significant.A stepwise crystallization experiment was conducted and the recovered salt was tested.The results showed that under the condition of a recovery rate of 90%，the TOC content of the recovered sodium chloride and sodium sulfate were 22.7 mg/kg and 26.5 mg/kg，respectively.The purity of sodium chloride was 93.2%，which met the secondary standard of sun industrial salt in the national industrial salt standard.Sodium sulfate had a purity of 93.0% and met the Class Ⅲ qualified products standard in the national industrial anhydrous sodium sulfate standard.
Key words： waste salt; sodium chloride; sodium sulfate; pyrolysis; total organic carbon; crystallization
LI Hongyuan , ZHANG Jianhua . Study on removal process of total organic carbon from industrial waste salts by pyrolysis[J]. Inorganic Chemicals Industry, 2024 , 56(10) : 95 -102 . DOI: 10.19964/j.issn.1006-4990.2024-0128
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