磷石膏钙渣制备硫酸钙晶须试验研究
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摘要
为高效利用磷石膏,以氢氧化钠分解磷石膏得到的钙渣为原料制备石膏晶须材料,试验利用盐酸从钙渣中提取钙,再用硫酸常压酸化法由氯化钙母液制备高纯硫酸钙晶须。结果表明:在硫酸用量nH2SO4/m钙渣=6mol/kg,反应温度90℃,反应时间60min,陈化时间60min,晶形助长剂MgCl2补加量为nCa2+/nMg2+=16∶1的条件下,制备得到平均长径比达到23～36、白度高于93%、纯度高达99.82%的石膏晶须产品。
In order to improve the comprehensive utilization of phosphogypsum,gypsum whisker was prepared from phosphogypsum calcium slag obtained from the decomposition of phosphogypsum by sodium hydroxide as raw material.In tests calcium was extracted from calcium slag by hydrochloric acid,and then high purity calcium sulfate whiskers were prepared from calcium chloride mother liquor by normal pressure acidification with sulfuric acid.The results show that under the conditions of the amount of sulfuric acid 6 mol/kg,reaction temperature 90 ℃,reaction time 60 min,aging time 60 min and dosage of crystal growth promoter MgCl2 nCa2+/nMg2+ =16∶1,gypsum whisker products with average aspect ratio of 23～36,whiteness of 93%and purity of 99.82% were prepared.
In order to improve the comprehensive utilization of phosphogypsum,gypsum whisker was prepared from phosphogypsum calcium slag obtained from the decomposition of phosphogypsum by sodium hydroxide as raw material.In tests calcium was extracted from calcium slag by hydrochloric acid,and then high purity calcium sulfate whiskers were prepared from calcium chloride mother liquor by normal pressure acidification with sulfuric acid.The results show that under the conditions of the amount of sulfuric acid 6 mol/kg,reaction temperature 90 ℃,reaction time 60 min,aging time 60 min and dosage of crystal growth promoter MgCl2 nCa2+/nMg2+ =16∶1,gypsum whisker products with average aspect ratio of 23～36,whiteness of 93%and purity of 99.82% were prepared.
引文
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[8]黄照昊,罗康碧,李沪萍.磷石膏中杂质种类及除杂方法研究综述[J].硅酸盐通报,2016,35(5):1 504-1 508.
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[11]吴晓琴,裘建军.常压盐溶液法从烟气脱硫石膏制备硫酸钙晶须研究[J].武汉科技大学学报,2011,34(2):104-110.
[12]徐海,郦和生,王岽.硫酸钙结晶过程及其影响因素研究[J].工业水处理,2011,31(5):67-69.
[13]许小云,刘瑾,樊建明.二水硫酸钙结晶过程研究进展[J].应用化工,2005,34(6):325-327.
[14]张勇,张宝林,王光龙,等.活性添加剂对硫酸钙结晶过程的影响[J].磷肥与复肥,2000,(4):16-17.
[15]杨林,周杰,李贺军,等.晶形助长剂对磷石膏制硫酸钙晶须性能的影响[J].无机盐工业,2012,44(10):41-43.
[2]叶学东.磷石膏利用现状及“十三五”发展思路[A].中国建筑材料联合会石膏建材分会第六届年会暨第十届全国石膏技术交流大会及展览会[C].西宁:2015.
[3]Shen W,Gan G,Dong R,et al.Utilization of solidified phosphogypsum as Portland cement retarder[J].Journal of Material Cycles&Waste Management,2012,14(3):228-233.
[4]Yang L,Yan Y,Hu Z H.Utilization of phosphogypsum as raw material for manufacturing of non-fired load-bearing wall bricks[J].Advanced Materials Research,2012:787-791.
[5]范征宇,李家和,宋亮.磷石膏脱水及凝结硬化性能研究[J].哈尔滨理工大学学报,2002,(3):48-51.
[6]Holanda F D C,Schmidt H,Quarcioni V A.Influence of phosphorus from phosphogypsum on the initial hydration of Portland cement in the presence of superplasticizers[J].Cement and Concrete Composites,2017,83:384-393.
[7]徐爱叶,李沪萍,罗康碧.磷石膏中杂质及除杂方法研究综述[J].化工科技,2010,18(6):59-64.
[8]黄照昊,罗康碧,李沪萍.磷石膏中杂质种类及除杂方法研究综述[J].硅酸盐通报,2016,35(5):1 504-1 508.
[9]Singh M,Garg M,Verma C L,et al.An improved process for the purification of phosphogypsum[J].Construction&Building Materials,1996,10(8):597-600.
[10]段庆奎,王立明.闪烧法——磷石膏的无害化处理新工艺[J].宁夏石油化工,2004,23(3):13-16.
[11]吴晓琴,裘建军.常压盐溶液法从烟气脱硫石膏制备硫酸钙晶须研究[J].武汉科技大学学报,2011,34(2):104-110.
[12]徐海,郦和生,王岽.硫酸钙结晶过程及其影响因素研究[J].工业水处理,2011,31(5):67-69.
[13]许小云,刘瑾,樊建明.二水硫酸钙结晶过程研究进展[J].应用化工,2005,34(6):325-327.
[14]张勇,张宝林,王光龙,等.活性添加剂对硫酸钙结晶过程的影响[J].磷肥与复肥,2000,(4):16-17.
[15]杨林,周杰,李贺军,等.晶形助长剂对磷石膏制硫酸钙晶须性能的影响[J].无机盐工业,2012,44(10):41-43.