Inorganic Chemicals Industry ›› 2023, Vol. 55 ›› Issue (1): 118-123.doi: 10.19964/j.issn.1006-4990.2022-0136

• Environment·Health·Safety • Previous Articles     Next Articles

Preparation of Fe3O4 from FeCl2 by-product of new process of titanium dioxide by hydrochloric acid

HU Luoxing1(),HUANG Qimao1,2(),QU Hongyou1   

  1. 1. Key Laboratory of Green Chemical Process of Ministry of Education,School of Chemical Engineering and Pharmaceutical Engineering,Wuhan University of Technology,Wuhan 430073,China
    2. National Engineering and Technology Research Center for Development & Utilization of Phosphorous Resources,Wuhan 430074,China
  • Received:2022-03-22 Online:2023-01-10 Published:2023-01-17
  • Contact: HUANG Qimao E-mail:1143630643@qq.com;huangqim@163.com

Abstract:

An enlarged process for preparing ferrous tetroxide magnetic powder from the by-product ferrous chloride of the new process of titanium dioxide by hydrochloric acid method was explored.The by-product hazardous waste ferrous chloride was prepared into widely used ferrous tetroxide magnetic powder to realize comprehensive utilization of resources.The research results showed that calcium oxide was used as precipitant to react with ferrous chloride to obtain ferrous hydroxide,Ferrous hydroxide was oxidized to trivalent ferric hydroxide by passing air under the aid of dispersant.The calcium oxide and dispersant feeding time interval was 1.5 h,the oxidation temperature was 80 ℃,and the oxidation time was 8.5 h.The ferric hydroxide and ferrous hydroxide were uniformly mixed with molar ratio of 2∶1.The solid was obtained by positive pressure separation,and the pH before separation was controlled to be 6.5.The ferrite tetroxide magnetic powder was obtained by post-processing of drying and grinding.The process was scaled up to 50 kg to obtain ferric oxide products,and the yield reached 97%.This process converted by-product hazardous waste into products with certain economic benefits,and further improved the new process of titanium dioxide by hydrochloric acid method.

Key words: titanium dioxide by hydrochloric acid method, by-product of new process, ferrous chloride, iron oxide

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