微波外场强化电石渣制备硫酸钙晶须及其机理分析

Preparation of Calcium Sulfate Whiskers by Microwave-enhanced Carbide Slag and Its Mechanism Analysis

本文以电石渣为原料,在稀硫酸溶液中制备硫酸钙晶须。在常规水热法最佳制备条件的基础上,不添加表面活性剂,利用微波反应器强化硫酸钙晶须结晶过程。分析了微波反应时间,微波辐射能量对结晶产物的影响。利用X射线衍射仪和扫描电子显微镜对制备的产物进行表征。结果表明,电石渣与稀硫酸溶液在微波强化的条件下反应10 min,微波辐射能量400 W时,制备的硫酸钙晶须形貌尺寸均一,晶须平均直径为2. 2μm,平均长径比70。在此基础上,进一步分析了微波效应与硫酸钙晶须的生长机理。

In this paper,calcium carbide slag was used as raw material to prepare calcium sulfate whiskers in dilute sulfuric acid solution. On the basis of the optimal preparation conditions of the conventional hydrothermal method,the crystallization process of calcium sulfate whiskers was strengthened by using a microwave reactor without adding a surfactant. The effects of microwave reaction time and microwave radiation energy on the crystalline product were analyzed. The prepared product was characterized by X-ray diffractometry and scanning electron microscopy. The results show that the calcium carbide slag and dilute sulfuric acid solution react under microwave enhanced conditions for 10 min,and the microwave radiant energy was400 W. The prepared calcium sulfate whiskers had uniform morphology,the average diameter of whiskers reaches 2. 2 μm,and the average aspect ratio was 70. On this basis,the microwave effect and the growth mechanism of calcium sulfate whiskers were further analyzed.