A kind of phosphogypsum soil conditioner and preparation method thereof

Abstract

The invention provides a phosphogypsum soil improver and a preparation method thereof, which are used for improving soil polluted by heavy metals and belong to the field of soil improvers. The phosphogypsum soil improver is prepared from the following raw materials: phosphogypsum treated with active microorganisms is used as a carrier, and modified activated carbon and adsorbent are added; the quality of the phosphogypsum accounts for 40-60% of the total quality of the improver %; the mass ratio of the modified activated carbon to phosphogypsum is 1:3-5; the balance is an adsorbent; the soil improver of the present invention is rich in mineral content and has a variety of fermentation active substances, which can significantly improve the microbial activity in the soil. The activity further improves the phosphatase activity, which improves the repair ability of the soil, forms the elastic mechanism of the soil for heavy metal deposition, and significantly improves the treatment effect on heavy metal-contaminated soil.

Description

technical field [0001] A phosphogypsum soil conditioner and a preparation method thereof are used for improving heavy metal-contaminated soil, and belong to the field of soil conditioners. Background technique [0002] Phosphogypsum is a by-product of the production of wet-process phosphoric acid, which is one of the largest solid wastes emitted by the chemical industry. my country's phosphogypsum resources and phosphogypsum production and emissions have typical regional characteristics, with more than 90% concentrated in Yunnan, Guizhou, Sichuan and Hubei provinces. In order to ensure the needs of agricultural production, my country needs to consume a large amount of phosphate fertilizer every year, and the production of one ton (P2O5 100%) of high-concentration phosphate fertilizer can produce about 5-6 tons of phosphogypsum. Phosphogypsum is about 75 million tons, and the overall utilization rate of phosphogypsum is 36.0%. The current stockpile of phosphogypsum in my cou...

AI Technical Summary

Problems solved by technology

[0003] In the current technology, the removal process of heavy metals using phosphogypsum is relatively simple, which is basically physical adsorption, but the physical adsorption itself will be released again, which is unstable; chemical precipitation is also a relatively common treatment method at present, but the final reactant situation is single. When changing, heavy metals will be released in different forms, resulting in weak processing capacity of heavy metals in the use of phosphogypsum, and it is difficult to achieve the pre-set effect

Images