Inorganic Chemicals Industry >
Study on new process of comprehensive utilization and separation of sulfur and calcium of titanium gypsum
Received date: 2021-10-22
Online published: 2022-07-14
In order to solve the problem of comprehensive utilization of titanium gypsum，a mild wet chemical conversion method was put forward.Using low-price ammonium bicarbonate as raw material，titanium gypsum solid waste was converted into high-quality calcium carbonate products，and ammonium sulfate and iron-rich slag were obtained at the same time.The test results showed that under the conditions of mass ratio of titanigypsum to ammonium bicarbonate of 1∶1，reaction temperature of 65 ℃ and reaction time of 1.25 h，the conversion rate of titanigypsum could reach more than 95%.The converted solid calcium carbonate and iron slag were heated and boiled with NH4Cl to recover ammonium carbonate，and the solid-liquid separation after the reaction was completed.Further reaction of the recovered ammonium carbonate with the separation liquid could obtain calcium carbonate with purity of more than 98% and iron slag with iron content of more than 61%.
Lei MA , Yu SHENG , Junhong ZHOU , Yujun YANG , Hui LUO , Chunying PAN , Guo WANG . Study on new process of comprehensive utilization and separation of sulfur and calcium of titanium gypsum[J]. Inorganic Chemicals Industry, 2022 , 54(7) : 124 -128 . DOI: 10.19964/j.issn.1006-4990.2021-0639
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