Formation Mechanism of Deposits in Rotary Kiln during Steelmaking Dust Carbothermic Recycling

Author:

Min Xiaobo123,Huang Luyu1,Yu Maixin1,Wang Yunyan123,Ke Yong123,Peng Cong123ORCID,Yan Xu123,Huang Qingyu1,Li Yun123

Affiliation:

1. School of Metallurgy and Environment, Central South University, Changsha 410083, China

2. State Key Laboratory of Advanced Metallurgy for Non-Ferrous Metals, Central South University, Changsha 410083, China

3. Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution, Central South University, Changsha 410083, China

Abstract

Rotary kiln has been widely used in hazardous waste treatment because of its strong adaptability to raw materials, high productivity, and simple processing technology. However, the formation of deposits reduces its performance period and profitability. This study characterized the deposit mineralogy and thermodynamically and experimentally investigated its formation mechanism. The results show that the main phases of the deposit are magnetite, monolithic iron, olivine, and yellow feldspar. They indicate that the deposit formation process was accompanied by the participation of alkaline and iron oxides. The intermediate product Ca2SiO4 can promote the generation of low melting point phases, such as CaFeSiO4 and Ca2Al2SiO7, which are the main phases of deposit materials. Additionally, the reduction intermediate product FeO facilitated the generation of a liquid ferrous mixture (Fe3O4-FeO and Fe3O4-FeO-Fe mixture), which in turn further promoted the growth of the initial deposit phase. The solid deposit formed and attached to the kiln inner wall, along with a decrease in temperature. These results are expected to provide an idea or approach for fundamentally solving the problem of deposits in the rotary kiln.

Funder

National Key R&D Program of China

National Natural Science Foundation of China

Science and Technology Innovation Program of Hunan Province

Foundation for Innovative Research Groups of the National Natural Science Foundation of China

Science and Technology Project of Gansu Province

Fundamental Research Funds for the Central Universities of Central South University

Publisher

MDPI AG

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