A kind of heavy metal polluted soil remediation agent and its preparation method and application

Abstract

A heavy metal-contaminated soil remediation agent and its preparation method and application. Steel slag particles are ball-milled into steel slag powder; steel slag powder is mixed with water, and a dispersing suspending agent is added to stir evenly to obtain a steel slag slurry, and the dispersing suspending agent is oleic acid amide , bis-stearamide, monoglyceride, polyvinyl alcohol; add a regulator to the steel slag slurry, stir evenly to obtain an activated steel slag slurry, and the regulator is potassium dihydrogen phosphate, phosphoric acid, oxalic acid or at least one of citric acids; the CO 2 Pass into the activated steel slag slurry for carbonization to obtain the heavy metal contaminated soil remediation agent. The heavy metal polluted soil remediation agent produced by the present invention has high efficiency, large specific surface area, good stability, strong acid buffering capacity, wide adaptability to environmental pH, temperature and humidity and other conditions of use, and can realize the recovery of industrial solid waste. Secondary utilization has good economic and environmental benefits.

Description

technical field [0001] The invention belongs to the field of environmental materials, in particular to a soil heavy metal pollution remediation agent, in particular to a heavy metal-contaminated soil remediation agent and its preparation method and application. Background technique [0002] In recent years, human life and production activities have produced a large amount of waste materials. Vigorous industrial development, while bringing considerable economic benefits, has also brought serious environmental heavy metal pollution. Heavy metals are extremely toxic to the human body, and are easy to accumulate in the environment, making it difficult to degrade naturally. There are many heavy metal remediation technologies for soil, including soil replacement method, electrodynamic method, leaching method, amendment method, bioremediation method and solidification / stabilization technology. The materials used in the solidification / stabilization method are particularly critical...

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Problems solved by technology

The patent application whose publication number is CN107021714A discloses a heavy metal polluted soil curing agent prepared by 30-55% of steel slag powder, 20-50% of quicklime powder, and 5-30% of phosphate-loaded biochar. The soil curing agent uses quicklime to increase The pH of the curing agent is changed, which has a great impact on the soil pH environment, and the preparation of phosphate-loaded biochar is difficult

The patent application with the publication number CN109012641A discloses a method of crushing and sieving steel slag, washing the crushed steel slag particles with distilled water, drying, and drying for later use; washing the ashes with distilled water, drying, and drying for later use; For the dried steel slag and furnace ash powder, use NaOH solution to adjust the pH, add potassium permanganate reagent, stir and react for 40-60 minutes, filter after reaction, and dry it for later use; in the modified steel slag and furnace ash mixture, add Adhesive chitosan, mixed evenly, roasted at high temperature, cooled the mixture after calcined, mixed and pulverized into 20 mesh granular heavy metal adsorbent, the preparation process of this adsorbent is cumbersome, NaOH and potassium permanganate reagent The price is high, and high-temperature roasting is required, which will greatly increase energy consumption, which is not in line with the concept of economy and environmental protection

The patent application whose publication number is CN107814544A discloses a kind of fly ash whose quality is 20% to 50% of the material quality, the activated steel slag powder is 30% to 50% of the material quality, and the lime powder is 10% to 10% of the total material quality. 30%, the mass of potassium dihydrogen phosphate powder is 0.5% to 2% of the total mass of the solidifying agent of the compound heavy metal polluted soil, the preparation process of the activated steel slag powder used in this solidifying agent is cumbersome, the price of the consumed water glass is high, and the effect of stimulating the steel slag is General, and calcined in an electric furnace greatly increases energy consumption

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