硫酸铁对硫酸钙晶须形貌影响研究

发布时间：2018-03-03 20:40

本文选题：中和渣　切入点：硫酸钙　出处：《矿产保护与利用》2017年02期 　论文类型：期刊论文

【摘要】：以某轧钢厂酸洗液的中和渣为原料,采用水热法制备硫酸钙晶须,利用XRD、SEM、EDS等手段对晶须产品进行了表征,系统研究了硫酸铁对硫酸钙晶须形貌的影响机理。结果表明,铁离子对硫酸钙晶须生长有不利影响,在利用水热法制备晶须时,Fe~(3+)主要以Fe(OH)_3形式存在,通过吸附在硫酸钙晶须的(111)晶面上,降低了晶须的表面能并限制该晶面的生长速率。此外,溶液中SO_4~(2-)可产生同离子效应,进而抑制二水硫酸钙溶解反应的进行,减弱二水硫酸钙溶解速率。在两者的联合作用下,导致生成的硫酸钙晶须数量减少,且其长径比相对较小,形貌转变为颗粒状和板状等形貌。研究可实现废酸中和渣的综合利用,并提高工业副产品的附加值。
[Abstract]:Calcium sulfate whisker was prepared by hydrothermal method from the neutralized slag of acid washing liquid in a rolling mill. The whisker product was characterized by XRDX SEMMAN EDS. The influence mechanism of ferric sulfate on the morphology of calcium sulfate whisker was systematically studied. The results showed that the effect of ferric sulfate on the morphology of calcium sulfate whisker was studied. Iron ions have adverse effect on the growth of calcium sulfate whiskers. When the whiskers are prepared by hydrothermal method, they mainly exist in the form of Fe(OH)_3, and are adsorbed on the surface of calcium sulfate whiskers. The surface energy of the whisker is reduced and the growth rate of the crystal surface is limited. In addition, the SO4D _ 2) in the solution can produce the same ion effect, which in turn inhibits the dissolution of calcium sulfate dihydrate and weakens the dissolution rate of calcium sulfate dihydrate. As a result, the number of calcium sulfate whiskers was reduced, and the aspect ratio of calcium sulfate whiskers was relatively small. The morphology of the whiskers was changed into granular and plate-like morphology. The comprehensive utilization of waste acid and slag can be realized, and the added value of industrial by-products can be increased.
【作者单位】：西安建筑科技大学材料与矿资学院;河南城建学院材料与化工学院;
【基金】：国家自然科学基金面上项目(51674097) 西安建筑科技大学学科建设重点培育学科专项基金项目(XK201205)
【分类号】：TQ132.32

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