黄磷炉渣酸浸过程铁钙分离特性的研究

Study on separating characteristics of iron and calcium in the acid leaching process of yellow phosphorus slag

采用硝酸浸出黄磷炉渣可制取白炭黑产品,浸出过程中杂质成分氧化钙和铁的浸出分离效果明显影响产品质量。研究了浸出过程中浸出条件对铁、钙分离的影响。实验得到最佳浸出条件:反应温度为100℃、液固质量比为14∶1、硝酸质量分数为20%、反应时间为6 h、搅拌速度为350 r/min。在此最佳工艺条件下,氧化钙浸出率为99.94%,铁浸出率为92.71%,固相白炭黑中的铁含量为450 mg/kg;制得的固相白炭黑二氧化硅质量分数达99.20%,比表面积达252 cm2/g,白度为88.51%。

White carbon black could be prepared from yellow phosphorus slag by nitric acid as leaching agent.The quality of white carbon black product was affected by the separation effect of CaO and Fe during the leaching process.The study showed that the leaching rates of CaO and Fe could reach 99.94% and 92.71% ,respectively, and the content of Fe in solid white car- bon black was 450 mg/kg ;the content of silica （SiO2） of prepared white carbon black could reach 99.20% （mass fraction）, specific surface area was 252 cm2/g, and white content was 88.51% under such optimum conditions as follow：reaction tem- perature was 100 C, fluid-solid ratio was 14：1, mass fraction of nitric acid was 20%, reaction time was 6 h, and stirring speed was 350 r/min.