磷石膏低温煅烧增白研究  

Study on whitening of phosphogypsum by low⁃temperature calcination

作　　者：唐雪梅 王美波 徐丽 张旭杰 邰石君 易贤美 刘红娟 潘邻屹 TANG Xuemei;WANG Meibo;XU Li;ZHANG Xujie;TAI Shijun;YI Xianmei;LIU Hongjuan;PAN Linyi(Guizhou Shengwei Research Institute of New Chemical Materials Co.,Ltd.,Guiyang 550014,China)

机构地区：[1]贵州胜威化工新材料研究院有限公司,贵州贵阳550014

出　　处：《无机盐工业》2024年第8期110-115,共6页Inorganic Chemicals Industry

基　　金：“钛-磷-硫-铁-钙”全资源循环利用技术创新平台项目(黔科中引地[2022]4019);工业一铵和钛白副产硫酸亚铁制备电池级磷酸铁技术研究项目(黔科合支撑[2023]一般463)。

摘　　要：基于磷石膏白度对后续磷石膏的大宗利用有至关重要的影响,为了更好地利用磷石膏资源,最大限度地发挥磷石膏的价值,对磷石膏的低温煅烧增白进行了研究。磷石膏经筛分后,在未加添加剂、加入单一添加剂(氯化铵、双氧水、氢氧化钙)、复合添加剂条件下进行煅烧实验。结果表明:单一添加剂中氯化铵的增白效果较好,添加质量分数为1%的氯化铵在460℃下煅烧后,磷石膏白度由68.3%升高至80.5%;当煅烧温度为400℃时,以质量分数为1%的氯化铵与质量分数为2.8%的氢氧化钙作为复合添加剂可以提高磷石膏白度至84.2%,同时在保证磷石膏白度在80.0%以上的条件下,可以将磷石膏煅烧温度降低至350℃。该复合添加剂能有效提高磷石膏白度,降低能耗。Based on the fact that phosphogypsum whiteness had a crucial influence on the subsequent bulk utilization of phosphogypsum,in order to better utilize the phosphogypsum resources,maximize the value of phosphogypsum,and im‐prove the phosphogypsum whiteness,the whitening of phosphogypsum by low‐temperature calcination was studied.Phospho‐gypsum was sieved and calcined under the conditions of no additives,adding single additives(ammonium chloride,hydro‐gen peroxide,calcium hydroxide),and composite additives,and the results showed that the whitening effect of ammonium chloride in the single additives was better,and the whiteness of phosphogypsum was increased from 68.3%to 80.5%after adding ammonium chloride with the mass fraction of 1%and calcined at 460℃.At the calcination temperature of 400℃,us‐ing ammonium chloride with a mass fraction of 1%and calcium hydroxide with a mass fraction of 2.8%as a composite addi‐tive could increase the whiteness of phosphogypsum to 84.2%.In addition,under the condition that the whiteness of phos‐phogypsum was above 80.0%,the calcination temperature of phosphogypsum could be reduced to 350℃.This composite ad‐ditive could effectively improve the whiteness of phosphogypsum and reduce energy consumption.

关 键 词：磷石膏 煅烧 增白 复合添加剂 

分 类 号：TQ177.3[化学工程—硅酸盐工业]