外文翻译更有效益地使用不锈钢电弧炉炼钢渣作为水泥原料及其重金属掺入量风险分析.docVIP

Baosteel Technical Research Volume 3, number 4, December 2009 , page 14 Beneficial use of stainless steel EAF slag as composite cement admixture and its heavy metals leaching risk analysis WANG Ruyi , CHEN Ronghuan and SHI Lei Environment Resources Division, Research Institute, Baoshan Iron Steel Co., Ltd., Shanghai 201900, China Abstract: This study analyzes the feasibility of using stainless steel electric arc furnace ( EAF ) slag as composite cement admixture and the risk of leaching-out of heavy metals. The results show that the stain less steel EAF slag, mainly made up of Ca2SiO4, Ca3Mg(SiO4)2, some Cr-containing minerals and in small particle size, is easily ground and has cementitious activity. EAF slag, w hen used as cement admixture, can be added with a maximum percentage of 32%. It can meet the strength requirements of the standard P·C 32.5 cement When the mixing percentage is decreased to 25%, the strength o f the cement can be increased to that of P·C 42.5 cement Other main quality indexes of composite cement such as the setting time and stability, also satisfy standard requirements. The results also show that most o f the heavy metals in the stainless steel EAF slag exist in a stable speciation. The concentration of heavy metals that leach out from the stainless steel EAF slag and the composite cement products is far lower than the standard limit of hazardous wastes. The m a in heavy metal chromium, exists as less hazardous trivalent chromium. Therefore, the risk of heavy metals leaching out from the stain less steel EAF slag is low. The internal expo sure index (IR) and the external exposure index (Iγ) of the stainless steel EAF slag are both lower than 1. 0, satisfying the standard requirements of the state for the radionuclides of building materials. Therefore, stainless steel EAF slag can be safely used as admixture to produce composite cement Key words: stainless steel EAF slag; composite cement admixture; heavy metal; risk of leaching out 1 I