醋酸酸解磷尾矿制备醋酸钙镁融雪剂工艺研究

doi:10.19964/j.issn.1006-4990.2023-0086

Abstract

Abstract:

Using solid waste phosphorus tailings generated from phosphate ore beneficiation as raw materials，in order to recover the valuable elements of calcium and magnesium from the solid waste of phosphate rock，calcium and magnesium acetate was prepared and P₂O₅was enriched in the solid waste of phosphate rock.An experimental study on the hydrolysis of phosphate tailings by acetic acid was carried out.The effects of acetic acid dosage，liquid-solid mass ratio，reaction temperature，stirring rate and reaction time on the leaching rate of calcium and magnesium from phosphate tailings were investigated.The results showed that the leaching rate of CaO and MgO could reach 78.26% and 76.32% under the conditions of liquid-solid mass ratio of 14∶1，reaction temperature of 90 ℃，stirring rate of 1 000 r/min and reaction time of 3 h，respectively.The content of P₂O₅in phosphate tailings could be increased from 8.82% to 25.91%.Calcium and magnesium acetate were obtained by evaporation and crystallization of acid-hydrolysate after pH adjustment.The characterization and performance tests were carried out.The results showed that its indicators met the requirements of GB/T 23851—2017 “Snowmelt Agent”，and it was an environmentally friendly snowmelt agent with low corrosion，degradability and excellent ice and snow melting performance.

Key words: phosphate tailings, acetic acid hydrolysis, environment-friendly snowmelt agent, calcium magnesium acetate

CLC Number:

X754

LI Mengyu, TANG Jianwei, LIU Yong, HUA Quanxian, LIU Pengfei, WANG Baoming. Study on preparation process of calcium magnesium acetate snowmelt agent from phosphorous tailings by acetic acid hydrolysis[J]. Inorganic Chemicals Industry, 2024, 56(1): 73-80.

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Study on preparation process of calcium magnesium acetate snowmelt agent from phosphorous tailings by acetic acid hydrolysis

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