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• W3138347685 startingPage "101971" @default.
• W3138347685 abstract "To efficiently dispose of chrome-polluted soil, the co-processing of raw meal mixed with chrome-polluted soil in a tube furnace (laboratory experiments) and a cement rotary kiln (field-scale experiments) were tested. The migration and transformation reactions of chromium were analyzed and the environmental risk was evaluated. The average mass balance value was 91% for the laboratory experiments. In field-scale experiments, the mass balance values were 110% for the control experiments and 84% when 1% soil was treated. Therefore, only a small amount of Cr was volatilized into the flue gas. The average total Cr concentration in the soil samples was 403.25 mg/kg, and the ratio of Cr(VI) to total Cr was 1.83% or less. On average, 45.15% of Cr(III) was oxidized to Cr(VI) in laboratory experiments, while 87.94% of Cr(III) was oxidized in field-scale experiments, and the difference could be a result of the different calcination conditions. The materials in the cement rotary kiln make full contact with oxygen, and in this high temperature and oxidizing atmosphere, abundant CaO and MgO promote the oxidation of Cr(III) to CaCrO4. SiO2, Al2O3, and Fe2O3 reduce CaCrO4, which inhibits Cr(III) oxidation. The Cr concentration in the cement products was well below the Chinese standard limits. The physical properties of clinker conformed to the Chinese standards. Therefore, the treatment of 1 wt% chrome-polluted soil with a cement rotary kiln is technically feasible and experimentally safe." @default.
• W3138347685 created "2021-03-29" @default.
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• W3138347685 date "2021-11-01" @default.
• W3138347685 modified "2023-10-16" @default.
• W3138347685 title "The migration and transformation of chromium during co-processing of cement raw meal mixed with chrome-polluted soil" @default.
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• W3138347685 doi "https://doi.org/10.1016/j.eti.2021.101971" @default.
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