作者简介:谢世前(1985—),男,四川大学硕士研究生. 研究方向:环境规划与管理. E-mail: 757859308@qq.com
中文责编:坪 梓; 英文责编:远 鹏
DOI: 10.3724/SP.J.1249.2017.06557
以攀枝花炼钢厂沉钒废渣(提取钒后冶炼废渣)为原料,采用预处理、中温煅烧和回收硫酸钠硫酸铵处理工艺,探讨原料水分及颗粒大小、煅烧温度、煅烧时间以及搅拌次数等对硫酸钠和硫酸铵混合结晶物产品纯度及有效回收率的影响. 通过正交试验,确定了比较理想的分离回收工艺条件为:干燥温度120 ℃,干燥时间1 h,干燥后原料中水分可由18.9%降至5.0%; 煅烧温度为400 ℃,煅烧时间3 h,搅拌3次. 分离所得硫酸钠和硫酸铵的纯度分别可达到90.56%和94.41%,有效回收率分别为91.31%和21.51%. 通过此方法分离产物硫酸铵与硫酸钠可用作生产原料,实现固废资源化,避免环境污染.
Taking the precipitated vanadium waste residue, which is smelting slag after extracting vanadium from Panzhihua Steel, as raw materials, and by using the techniques of pretreatment, medium temperature calcination and recovery of sodium sulfate ammonium sulfate, we explore the effects of material moisture content, particle size, calcination temperature, calcination time and stirring number on product purity as well as the recovery efficiency of mixed crystals of sodium sulfate and ammonium sulfate. The ideal separation recycling process conditions is obtained by orthogonal test. The optimal drying process parameters are drying temperature of 120 ℃, drying time of 1 h, by which the moisture in the raw material could reduce from 18.9% to 5%. The optimal calcination process parameters include calcination temperature of 400 ℃,calcination time of 3 h, stir of 3 times. Finally, the purity of segregate sodium sulfate and segregate ammonium sulfate could reach 90.56% and 94.41%, respectively; and their recovery efficiency is 91.31% and 21.51%, respectively. The segregate sodium sulfate and segregate ammonium sulfate produced with this method can be used as raw materials directly. This process can not only achieve solid waste recycling, but also avoid environmental pollution.