Abstract：Red mud, fly ash and phosphogypsum are three different industrial solid wastes, which not only have a huge pile of stock, but also have serious environmental pollution. According to the new environmental protection policy put forward by the state in field of solid waste, it is urgent to strengthen the secondary utilization of bulk solid waste, extract its surplus value and reduce environmental pollution. Co-reduction roasting-leaching-magnetic separation process for three kinds of solid waste, red mud, fly ash and phosphogypsum, was used to extract iron and aluminum in sintering material. The effects of alkali ratio, carbon ratio and mixed alkali concentration on the recovery of iron and aluminum were discussed. At the same time, air and nitrogen were introduced into the roasting process for comparative experiments, and average value of the three experiments was taken for result analysis. The experiment results show that the iron recovery rate is about 79%, the aluminium leaching rate is about 76%, and the iron grade is about 75%. Through experimental research, an idea for red mud, fly ash and phosphogypsum application in the field of metal recovery is provided, and it has reference value for the collaborative recycling of bulk solid waste.
王尚杰夫, 金会心, 雷二帅, 王正兴, 顾炜. 赤泥、粉煤灰和磷石膏配碳碱性调控共烧结回收铁铝[J]. 中国冶金, 2023, 33(4): 119-126.
WANG Shang-jie-fu, JIN Hui-xin, LEI Er-shuai, WANG Zheng-xing, GU Wei. Recovery of iron and aluminum from red mud, fly ash and phosphogypsum by co-sintering under alkaline control of carbon addition[J]. China Metallurgy, 2023, 33(4): 119-126.
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2023, Vol. 33 
