Environment·Health·Safety

Study on properties of wet detoxification Fe-Cr slag as concrete admixture

  • Yuan WANG ,
  • Zhi WANG ,
  • Hongyi QIN
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  • College of Materials Science and Engineering,Chongqing University,Chongqing 400030,China

Received date: 2021-05-18

  Online published: 2022-03-18

Abstract

Fe-Cr slag is an industrial waste produced after using chromite as raw material to produce metal chromium and chromium salts.After wet detoxification by FeSO4,the Fe-Cr slag still has certain volcanic ash activity,which can be used as concrete mineral admixture.However,the water-soluble Cr(Ⅵ) in wet detoxification of Fe-Cr slag affects the utilization of building materials resources.The particle size distribution and volcanic ash activity of the wet detoxification Fe-Cr slag were studied.The wet detoxification Fe-Cr slag was used as mineral admixture instead of fly ash in C30 concrete.The working properties,mechanical properties and leaching amount of water-soluble Cr(Ⅵ) of concrete were investigated.The results sho-wed that the particle size of the wet detoxification Fe-Cr slag was mainly distributed in the range of 1~20 μm,and the activity index of 28 d reached 68%.When the fly ash was replaced by 20% by the wet detoxification Fe-Cr slag,the slump of concrete increased by 38.2%,and the strength of concrete at 7 d and 28 d increased by 7% and 6%,respectively.The amount of water soluble Cr(Ⅵ) was different according to the different standard.Wet detoxification Fe-Cr slag may be used as mineral admix-ture,but the leaching of water-soluble Cr(Ⅵ) should be considered to ensure the safe use of concrete.

Cite this article

Yuan WANG , Zhi WANG , Hongyi QIN . Study on properties of wet detoxification Fe-Cr slag as concrete admixture[J]. Inorganic Chemicals Industry, 2022 , 54(3) : 87 -90 . DOI: 10.19964/j.issn.1006-4990.2021-0327

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