Inorganic Chemicals Industry >
Preparation of high purity calcium oxide combined with sulfuric acid from fluorine gypsum decomposed by sulfur
Received date: 2020-01-11
Online published: 2020-07-13
The fluorine gypsum is a by-product in the production of hydrofluoric acid.In order to turn waste into treasure,sulfuric acid and high-purity calcium oxide were prepared by using two-stage method with sulfur as reducing agent.The fluorine gypsum was reduced by sulfur vapor in the first stage,the generated CaS and fluorine gypsum reacted in the second stage,and the final products high purity CaO and SO2 were obtained.The prepared CaO can be used to neutralize the waste acid or for sale after purification.The prepared SO2 can be used to produce sulfuric acid.The process can not only realize the internal circulation of sulfur and calcium in factory,but also reduce the cost of sulfuric acid.The optimal reaction condition was obtained through thermodynamic analysis and verify test which contained various temperatures in the first stage and second stage and different raw materials ratio in second stage.The results were as follows: the reaction temperatures of the first stage and second stage were 800 ℃ and 1 100 ℃ respectively,the holding times of the first stage and second stage were 2 h and 1.5 h respectively,n（CaS）:n（CaSO4）=1.2:3 in second stage.The CaS mass fraction after the first stage was 83.51%.The purity of CaO after the second stage was 85.38% and can be further purified to 99.87%.The production cost of sulfuric acid is estimated at 117.9 yuan/t,which is lower than the market price of sulfuric acid and has a great market prospect.
Key words： fluorine gypsum; sulfur; sulfuric acid; high purity calcium oxide
Yulu Zhang , Ye Wang , Lin Yang , Xiushan Yang , Xinlong Wang . Preparation of high purity calcium oxide combined with sulfuric acid from fluorine gypsum decomposed by sulfur[J]. Inorganic Chemicals Industry, 2020 , 52(7) : 70 -73 . DOI: 10.11962/1006-4990.2019-0474
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