Alumina leaching properties of calcium sulphoaluminate

doi:10.11949/j.issn.0438-1157.20160452

Abstract

Abstract:

Analytically pure carbonate calcium, alumina and dihydrate calcium sulfate were used to synthesize calcium sulphoaluminate(3CaO·3Al₂O₃·CaSO₄, C₄A₃S) at 1375℃ for 2 h.The phase compositions and microstructure were characterized.The effects of carbon alkali concentration, alkali concentration, leaching temperature, leaching time and particle sizes on the alumina leaching properties of C₄A₃S were explored.The results show that the alumina leaching ratio of C₄A₃S increases with the increase of concentration of sodium carbonate and alkali, then trends to stable.The leaching ratio becomes higher when the particle size of clinker decreases.Compared with 12CaO·7Al₂O₃(C₁₂A₇), the alumina of C₄A₃S is easier to be dissolved because of its porous structure, and the alumina leaching ratio is up to 98% under 10 min leaching.The concentration of sodium carbonate and the dissolution temperature of C₄A₃S is lower than that of C₁₂A₇.The alumina leaching ratio of C₄A₃S could reach 98.76% under the optimum conditions:sodium carbonate 80 g·L^-1, alkali 10 g·L^-1, dissolution temperature 80℃ and dissolution time 10 min.

Key words: calcium sulphoaluminate, alumina, leaching, high-sulfur bauxite

摘要：

使用分析纯CaCO₃、Al₂O₃与CaSO₄·2H₂O配料，在1375℃、保温2 h的条件下合成了纯物相硫铝酸钙3CaO·3Al₂O₃·CaSO₄（C₄A₃S），对其物相组成和微观形貌进行了表征。并探究了碳碱浓度、苛碱浓度、溶出温度、溶出时间、粒度等因素对C₄A₃S氧化铝溶出性能的影响。结果表明：C₄A₃S的氧化铝溶出性能随着碳碱与苛碱浓度的增加先提高，之后趋于稳定。粒度越小，溶出率越高。与七铝酸十二钙12CaO·7Al₂O₃（C₁₂A₇）相比，C₄A₃S的孔洞状结构使其氧化铝更易溶出，在10 min时氧化铝溶出率即达到98%以上，且溶出所需的碳碱浓度与溶出温度均低于C₁₂A₇。在最佳条件：碳碱80 g·L^-1、苛碱10 g·L^-1、溶出温度80℃、溶出时间10 min下，C₄A₃S的氧化铝溶出率为98.76%。

关键词: 硫铝酸钙, 氧化铝, 溶出, 高硫铝土矿

CLC Number:

TF803.21

CHU Weiqin, ZHANG Xuezheng, MA Dongdong, SUN Huilan, WANG Bo. Alumina leaching properties of calcium sulphoaluminate[J]. CIESC Journal, 2017, 68(1): 460-466.

楚维钦, 张学政, 马东东, 孙会兰, 王波. 硫铝酸钙的氧化铝溶出性能[J]. 化工学报, 2017, 68(1): 460-466.

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