电石渣制备过氧化钙液相循环工艺的研究

Study on liquid circulation process for preparation of calcium peroxide by carbide slag

为了综合利用工业电石废渣,减少固体污染排放,开发了液相循环工艺。用电石渣与氯化铵和双氧水反应制备过氧化钙,并将副产的氯化铵溶液循环使用。采用单因素和正交实验对钙提取和过氧化钙制备的工艺参数做了优化。实验得到钙离子提取的最佳工艺参数:电石渣过量20%、反应时间为30 min、搅拌速度为300 r/min,此时钙提取率为83.3%,氯化铵利用率为98.5%。过氧化钙制备的最佳工艺参数:稳定剂用量为9%(质量分数)、反应时间为20 min、混合液用量为5%、搅拌速度为500 r/min,此时产品收率为94.69%,纯度为69.74%。

In order to comprehensively utilize the calcium carbide waste residue produced in industry and reduce the solid pollution emissions,the liquid phase cycling process was developed.Calcium slag was used to react with ammonium chloride and hydrogen peroxide to prepare calcium peroxide,and the by-product ammonium chloride solution was reused. Single factor and orthogonal experiment methods were used to optimize the process parameters of calcium ion extraction and calcium peroxide preparation,respectively.The results showed that the optimum process conditions of calcium ion extraction were as follows：excess calcium carbide slag 20%,reaction time was 30 min and stirring speed was 300 r/min,under which the calcium extraction yield was 83.3% and ammonium chloride utilization rate was 98.5%.The optimum process pa rameters of calcium peroxide preparation were as follows：dosage of stabilizing agent was 9%（mass fraction）,reaction time was 20 min,dosage of mixed solution was 5%,stirring speed was 500 r/min,under which the yield and purity of the product were 94.69% and69.74%,respectively.