TRANSFORMATION OF Cr CHEMICAL FORMS IN CEMENT KILNS CO-PROCESSING Cr CONTAMINATED SOIL

YANG Liu-yang; WANG Lei; CUI Chang-hao; LIU Mei-jia; LI Li; YAN Da-hai

doi:10.13205/j.hjgc.202110026

Volume 39 Issue 10

Jan. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2021 > 39(10): 185-190

YANG Liu-yang, WANG Lei, CUI Chang-hao, LIU Mei-jia, LI Li, YAN Da-hai. TRANSFORMATION OF Cr CHEMICAL FORMS IN CEMENT KILNS CO-PROCESSING Cr CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(10): 185-190. doi: 10.13205/j.hjgc.202110026

Citation:

YANG Liu-yang, WANG Lei, CUI Chang-hao, LIU Mei-jia, LI Li, YAN Da-hai. TRANSFORMATION OF Cr CHEMICAL FORMS IN CEMENT KILNS CO-PROCESSING Cr CONTAMINATED SOIL[J]. ENVIRONMENTAL ENGINEERING , 2021, 39(10): 185-190. doi: 10.13205/j.hjgc.202110026

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TRANSFORMATION OF Cr CHEMICAL FORMS IN CEMENT KILNS CO-PROCESSING Cr CONTAMINATED SOIL

doi: 10.13205/j.hjgc.202110026

1. School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 210000, China;
2. Research Institute of Solid Waste Management, Chinese Research Academy of Environmental Sciences, Beijing 100012, China

Received Date: 2020-11-29
Available Online: 2022-01-26

Abstract

Abstract

To control water-soluble Cr(Ⅵ) compound in cement clinker from the waste source into the kiln, and make sure the reasonable co-processing of chromium contaminated soil, this paper put forward the conversion rate from Cr(Ⅲ) in raw materials to Cr(Ⅵ) and water soluble Cr(Ⅵ) in the clinker as the breakthrough point and then conduct a research. The experiments were carried out under simulated and field test conditions, and the results were calculated through mass balancing method and conversion rate of Cr(Ⅵ). It was found that the total amount of Cr changed slightly before and after calcination, and the conversion rates of Cr(Ⅲ) to Cr(Ⅵ) in simulated calcination experiment and field test were 40% and 90%, respectively. The water-soluble Cr(Ⅵ) was only detected in clinker in filed test, with a proportion of 60%~69% of total Cr(Ⅵ). Eventually, the conversion rate of water-soluble Cr (Ⅵ) was calculated to be approximately 35.40%. The mixing degree of air and raw material showed an significant impact on the conversion rate of Cr(Ⅲ) to water-soluble Cr(Ⅵ). The analysis of cement product revealed that the concentration of water-soluble Cr(Ⅵ) was slightly higher in composite Portland cement, but still below the allowable limit in China's nation standard GB 31893-2015.
- cement kiln,
- contaminated soil,
- co-processing,
- Cr(Ⅵ),
- conversion rate

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References(35)

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