天然锰钾矿处理含Cd^(2+)废水实验研究  

The treatment of Cd^(2+)-bearing sewage by natural crytomelane

作　　者：郑德圣[1] 鲁安怀[1] 高翔[2] 赵谨[1] 马生凤[1] 

机构地区：[1]北京大学地球与空间科学学院,北京100871 [2]北京城市学院,北京100083

出　　处：《岩石矿物学杂志》2003年第4期360-364,共5页Acta Petrologica et Mineralogica

基　　金：国家重大基础研究前期研究专项资助项目 ( 2 0 0 1CCA0 2 40 0 ) ;国家自然科学基金资助项目 ( 4 9972 0 17)

摘　　要：利用天然锰钾矿处理实验室内配置的含Cd2 + 废水 ,结果表明 :天然锰钾矿对水溶液中Cd2 + 的去除达平衡需 2d以上 ;锰钾矿粒径越小对Cd2 + 的去除量越大 ;溶液中Cd2 + 的浓度不太高时 ,去除量随溶液浓度的升高而增大 ;在酸性介质中去除量随pH值增大先降低后增大 ,pH值超过 6 .3时天然锰钾矿表面开始带负电荷 ,在弱碱性介质中去除量最大 ;不同电解质对去除量的的影响主要是由Cl-与Cd2 + 的络合造成的。实验浓度范围内能很好地用Lang muir吸附等温线拟合 ,对Cd2 + 的最大吸附量为 5 .5 4mg/ g。锰钾矿处理含Cd2 + 废水的过程中伴随有K+ 和Mn2 + 溶出。处理Cd2 + 后的锰钾矿渣 ,经超声并淋滤后仍有大部分的Cd2 + 被固持 ,固持率可达去除量的 79.82 %。The Cd 2+ _bearing solutions prepared in laboratory were treated by natural cryptomelane. According to the experimental results, it is at least 2 days before the process can reach balance; the disposal quantities become larger when the radius of the cryptomelane becomes smaller; if the concentrations are not too high, the disposal quantities of Cd 2+ by unit mass of mineral powder will increase with the increasing concentration; pH value is the dominant factor governing the disposal quantities of Cd 2+ : the quantity of the treated Cd 2+ gets down until reaching the minimum when the pH value is lower than 3, and then goes up and arrives at the maximum until pH value is near 11. The negative ions in the solution affect the quantity through complexation with Cd 2+ ions. Within the whole range of concentration, the disposal quantities curve can be fitted well by Langmuir isotherms, with the maximum being 5.54 mg/g. The treatment of the ions by the mineral powder is accompanied by the dissolution of the Mn 2+ and K + ions. When the cinders of the powder are leached, they still hold most of the Cd 2+ (79.82%) separated from the solution.

关 键 词：天然锰钾矿 重金属离子 CD^2+ 吸附解吸 水体污染 废水处理 

分 类 号：X703.1[环境科学与工程—环境工程] P578.4[天文地球—矿物学]