Material for heavy metal mineralization as well as preparation method and application thereof

Through the replacement reaction of silicate and insoluble phosphate and acid gelling drying, a heavy metal mineralized material that does not produce phosphorus-containing wastewater was prepared, which solved the wastewater problem and the low repair efficiency of heavy metals in the material preparation process in the prior art, and achieved efficient heavy metal fixation and repair effects.

CN119709210AActive Publication Date: 2025-03-28CENT SOUTH UNIV
5 Cites 1 Cited by

Patent Information

Application Number
CN202411880664.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-19
Publication Date
2025-03-28
Estimated Expiration
2044-12-19

AI Technical Summary

Technical Problem

During the preparation process, existing phosphate repair materials are prone to phosphorus-containing wastewater, with low reaction activity and low adsorption capacity, resulting in low repair efficiency of heavy metal-contaminated soil and a risk of secondary release.

Method used

By mixing the silicate solution with the insoluble phosphate for substitution reaction, polyhydroxy phosphate is generated and gel-dried in an acidic solution, a material for heavy metal mineralization without producing phosphorus-containing wastewater was prepared. This material can form stable metal-phosphate minerals with heavy metals, improving the remediation effect of heavy metals.

Benefits of technology

The fixation rates of this material for Cd, Pb, Zn, As and Sb within 7 days reached 87.5-96%, 91.8-96.4%, 87.4-93.4%, 61.5-95.3% and 70.3-84.96% respectively. The fixation rates of simulated heavy metals and metal-like ion wastewater also reached more than 99.9%, significantly improving the heavy metal repair effect.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention provides a material for heavy metal mineralization as well as a preparation method and application thereof, and belongs to the technical field of soil remediation. The preparation method of the material for heavy metal mineralization provided by the invention comprises the following steps: mixing a silicate solution with insoluble phosphate for substitution reaction to obtain a mixed solution; and mixing the mixed solution with an acidic solution, gelatinizing, and drying to obtain the material for heavy metal mineralization. According to the invention, the silicate solution and the insoluble phosphate are mixed for reaction, so that phosphate radicals in the insoluble phosphate enter the solution, and the reactivity of the material in the use process is improved; the acid solution is added for gelling, so that phosphorus-containing wastewater can be effectively prevented from being generated; the material is changed into a porous structure through drying, more active sites are provided for heavy metal attachment, and then heavy metal is better fixed. The result of the embodiment shows that the prepared material for heavy metal mineralization has a good heavy metal repairing effect.
Need to check novelty before this filing date? Find Prior Art