摘要
以高炉渣为主要原料,在激发剂的作用下制备一种新型重金属固化剂HMS,与传统固化剂氧化钙、磷酸二氢钙进行了土壤重金属有效态钝化对比研究.结果表明:在固化剂与土壤的质量比为1∶4时,均为HMS、氧化钙、磷酸二氢钙的最佳掺量.在3种固化剂为最佳掺量,液固比为0.28∶1(L/kg),室温下养护28 d,有效态Pb含量的钝化效果以磷酸二氢钙最佳,为97.05%,有效态Zn、Cd含量的钝化效果以氧化钙最佳,分别为80.41%、74.74%,HMS对降低有效态Zn、Pb、Cd含量的钝化效果分别为46.12%、53.26%、65.64%,均处于第二的位置;与原土壤相比,掺入氧化钙处理28 d土壤p H值提高3.64,掺入磷酸二氢钙处理28 d土壤的p H值降低4.85,掺入HMS处理28 d土壤p H值提高0.99;本实验中HMS对污染土壤具有最均衡的修复效果,能实现以废治废,是3种固化剂中最理想的土壤重金属固化剂.最后,探讨了3种固化剂的钝化机理.
A comparative study on the passivation of available heavy metals in soil was carried out among the traditional curing agents, including calcium oxide, calcium dihydrogen phosphate, and a new heavy metal curing agent HMS. The main raw material of HMS was blast furnace slag and the new curing agent was prepared under the effect of activator. The results indicate that the optimal additive amount of HMS, calcium oxide and calcium dihydrogen phosphate are obtained when the mass ratio of curing agent to soil is 1：4. The best passivation effect on content of available Pb achieved by the soil treated by calcium dihydrogen phosphate is 97.05 %; the best passivation effect on content of available Zn and Cd achieved by the soil treated by calcium oxide is 80.41% and 74.74 %, respectively; the second passivation effect on the content of available Zn, Pb and Cd achieved by the soil treated by HMS is 46.12 %, 53.26 % and 65.64 %, respectively when the soil is treated by three curing agents under their optimum mix amount; the mass ratio between the liquid and solid is 0.28：1 （L/kg） with curing temperature 25 ~C and curing time 28 d. Compared with the original soil, the soil pH value is increased by 3.64 and 0.99 with calcium oxide and HMS treatment for 28 d, respectively, and is decreased by 4.85 with calcium dihydrogen phosphate treatment for 28 d. HMS has the most balanced recovery effect on the contaminated soil. Therefore, it is the most ideal one of three curing agents in this experiment and can attain the purpose of waste control by waste. Finally,the passivation mechanism of three curing agents is discussed.
出处
《有色金属科学与工程》
CAS
2016年第1期54-58,共5页
Nonferrous Metals Science and Engineering
基金
国家"十二五"科技支撑计划项目(2012BAC09B02)
关键词
高炉渣
固化剂
重金属
氧化钙
磷酸二氢钙
blast furnace slag
curing agent
heavy metal
calcium oxide
phosphate
作者简介
通信作者：何哲祥（1963-），男，博士，教授，主要从事尾矿处置及污染控制、冶炼炉渣、粉煤灰等矿冶废物利用领域研究，E—mail：hncsxy301@163．com．
