摘要
采用零价铁和碱激发矿渣对铬渣进行稳定/固定化处理,考察了处理后固化体的毒性浸出水平,矿物组成及Cr形态分布变化情况,并对铬渣的处置和利用的有效性进行评价.结果表明,还原固定化处理后的样品硫酸硝酸法浸出毒性可满足作为砖或砌块使用的标准,抗压强度均高于15 MPa,其中Cr主要以Fe/Mn氧化物结合态存在,可被用于采石场修复、封闭泻湖以及作为路基材料等一些特殊用途.
The solidification / stabilization( S / S) of chromite ore processing residue( COPR) was performed using zero-valent iron( ZVI) and lime-activated ground granulated blast furnace slag( GGBFS). The degree of Cr immobilization was evaluated using the leaching procedure, mineral composition analysis and morphology analysis. Semi-dynamic leaching tests were implemented to investigate the potential for reusing the final treatment product as a readily available construction material. The results showed that after reduction,all of the S / S treated COPR samples met the pollution control limit of bricks and building block products( Chinese standard HJ / T 301-2007) produced with COPR for total Cr( 0. 3 mg·L-1),the compressive strength of all the S/S samples could meet the compressive strength standard( 15 MPa) for producing clay bricks,and Cr existed as the specie that bound to Fe / Mn oxides in the S /S samples. At the same time,all of the S / S treated specimens tested were suitable for utilization at certain levels.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2015年第8期3026-3031,共6页
Environmental Science
基金
哈尔滨工业大学城市水资源与水环境国家重点实验室自主课题项目(2014DX02)
关键词
铬渣
稳定/固定化
碱激发矿渣
零价铁
浸出
COPR
solidification / stabilization
lime-activated ground granulated blast furnace slag
ZVI
leaching
