天然磁黄铁矿机械活化强化除砷技术  

Arsenic removal technology based on mechanical activation of natural pyrrhotite

作　　者：张荥斐 刘屾淼 曹学锋[1,2] 韩海生[1,2] 孙伟[1,2] 成朋飞 王丽[1,2] ZHANG Xingfei;LIU Shenmiao;CAO Xuefeng;HAN Haisheng;SUN Wei;CHENG Pengfei;WANG Li(School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,China;Key Laboratory of Hunan Province for Clean and Efficient Utilization of Strategic Calcium-containing Mineral Resources,Central South University,Changsha 410083,China)

机构地区：[1]中南大学资源加工与生物工程学院,湖南长沙410083 [2]中南大学战略含钙矿物资源清洁高效利用湖南省重点实验室,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2019年第11期2623-2632,共10页Journal of Central South University:Science and Technology

基　　金：中南大学中央高校基本科研业务费专项资金资助项目(2019zzts702);国家自然科学基金资助项目(51634009,51804340)~~

摘　　要：以天然磁黄铁矿为净化剂,研究As(Ⅲ)在磁黄铁矿表面的吸附、转化行为;基于机械活化原理,开发高质量浓度含砷废水净化除砷技术。研究结果表明:As(Ⅲ)吸附在磁黄铁矿表面,并与表面S^2-发生作用生成As2S3,矿物表面同时发生氧化反应生成少量As2S5,As2O3和As2O5,表面含砷组分及单质硫在一定程度上阻碍磁黄铁矿与溶液中砷的进一步反应。通过对磁黄铁矿进行机械活化处理,一方面,可减小磁黄铁矿粒度、增大比表面积,另一方面,暴露具有较高活性的新鲜表面,极大地提高磁黄铁矿的除砷效率;当pH为3.0~3.5、温度为80℃、反应时间为24 h、磁黄铁矿初始质量浓度为12 g/L时,砷的去除率大于97%。Natural pyrrhotite was used as a purifying agent to study the adsorption and transformation behavior of As(Ⅲ) on the surface of pyrrhotite. Based on the mechanical activation, the arsenic removal technology of acid wastewater with high mass concentration of arsenic was developed. The results show that As(Ⅲ) adsorbs on the surface of pyrrhotite and reacts with surface S^2- to form As2S3. The surface of the mineral is simultaneously oxidized to form a small amount of As2S5, As2O3 and As2O5. The presence of arsenic-containing components and elemental sulfur on the surface hinder the further reaction of pyrrhotite with arsenic in the solution to some extent.On the one hand, activated treatment of pyrrhotite by mechanical activation reduces the size of pyrrhotite and increases the specific surface area. On the other hand, it exposes the fresh surface with higher activity, and greatly improves the arsenic removal efficiency of pyrrhotite. The removal rate of arsenic is over 98% when pH is 3.0-3.5 and temperature is 80 ℃, with reaction time being 24 h, and an initial dosage of pyrrhotite being 12 g/L.

关 键 词：磁黄铁矿 As(Ⅲ) 水处理 机械活化 

分 类 号：TD923[矿业工程—选矿]