A steel slag conversion process for total chromium removal

By converting steel slag into carboxyl-modified powder loaded with hydroxyapatite, and utilizing the conversion of Fe and Ca elements and visible light irradiation, the problem of Cr(VI) removal from wastewater was solved, achieving efficient resource utilization of steel slag and fixation of total chromium, and simplifying the operation process.

CN118957175BActive Publication Date: 2026-02-06BEIJING UNIV OF TECH
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Patent Information

Application Number
CN202410893387.1
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-04
Publication Date
2026-02-06
Estimated Expiration
2044-07-04

AI Technical Summary

Technical Problem

Existing technologies are ineffective at removing Cr(VI) ions from wastewater, and the reduced Cr(III) products are easily oxidized to Cr(VI) in the natural environment, leading to continuous pollution, and the utilization rate of steel slag resources is low.

Method used

By controlling the reaction conditions, the Fe and Ca elements rich in steel slag are converted into carboxylic acid complexes and hydroxyapatite. Cr(VI) is reduced and Cr(III) is adsorbed and fixed under visible light irradiation to prepare carboxyl-modified steel slag powder loaded with hydroxyapatite.

Benefits of technology

It achieves efficient removal of total chromium from wastewater, reduces costs, improves the resource utilization rate of steel slag, simplifies the operation process, and has good repeatability.

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Abstract

The application discloses a steel slag conversion method for total chromium removal, and belongs to the field of functional materials. The steel slag is subjected to water bath treatment in an alcohol-water mixed solvent by using an organic carboxylic acid, then the obtained powder is dispersed in water, the suspension is adjusted to an alkaline pH of 8-11, and then a phosphate is added to perform a heating reaction in a water bath. In the application, by controlling the reaction conditions, the elements such as Fe and Ca rich in the steel slag can be effectively utilized, the iron ions in the steel slag are converted into carboxylic acid complexes, and the calcium ions are converted into calcium hydroxyphosphates, so that the illumination reduction of Cr(Ⅵ) and the adsorption and fixation of Cr(III) products are realized respectively, and the purpose of effectively removing chromium is achieved. Therefore, the application not only realizes the effective utilization of the steel slag solid waste, but also realizes the removal of chromium pollutants in sewage, and has good economic value and environmental effect.
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