Red mud dealkalization resource utilization method

Abstract

The application discloses a method for dealkalization of red mud and resource utilization, characterized in that the method comprises the following steps: adding red mud and titanium dioxide waste acid into deionized water, adding hydrogen peroxide, fully stirring to form a mixed solution, filtering, obtaining dealkalization clear liquid and dealkalization residue; adjusting the pH of the dealkalization clear liquid to neutral, performing solid-liquid separation, obtaining second residue and second clear liquid; adding calcium oxide to the second clear liquid, collecting the gas generated in the process by spraying, performing solid-liquid separation, obtaining third residue and third clear liquid and recycling; and recycling after evaporation and concentration of the spraying liquid. The application enriches the iron content in the dealkalization red mud while dealkalizing the red mud, which is beneficial to iron recovery; the obtained second residue is iron hydroxide, which can be directly used as iron concentrate for recovery and smelting; the third clear liquid is concentrated by evaporation to obtain concentrated ammonia water for continuous reuse, thereby reducing ammonia water consumption; a small amount of solid waste calcium sulfate is generated, and solid waste reduction, resource utilization and harmlessness are truly realized.

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