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A kind of mineral-based soil remediation agent and preparation method thereof

A soil remediation agent and mineral technology, used in soil conditioning materials, chemical instruments and methods, fertilizer mixtures, etc., can solve problems such as contaminated soil, and achieve the effects of reducing accumulation, low production costs, and wide sources.

Active Publication Date: 2020-11-10
HUNAN LONGE GALLOP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0027] The present invention aims to provide a mineral-based soil remediation agent and a preparation method thereof, realize the industrial production of the mineral-based soil remediation agent, and solve the problem of remediation of heavy metal-contaminated soil

Method used

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  • A kind of mineral-based soil remediation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1 Preparation of mineral-based soil remediation agent for remediation of Cd and As contaminated soil by using calcareous raw materials, sodium raw materials and potassium feldspar mixed roasting

[0062] Mix 962g of calcium sulfate, 38g of sodium nitrate and 5000g of potassium feldspar ore powder evenly, roast in a muffle furnace, control the roasting temperature not higher than 1550°C, roast for 2 hours, crush and mill after cooling, and control the fineness to -250 microns Standard sieve ≥ 80%, and then carry out 1.5h water immersion (the mass ratio of water and raw ore is 8:1), a total of 3 times of leaching, after filtration, solid 1 and 3900mL liquid 1 were obtained. Carbon dioxide is introduced into the liquid 1 to produce products such as aluminum hydroxide and potassium carbonate by carbon method. Solid 1 had 25% available silicon, 53% available calcium, and a pH of 12. The solid 1 is dried and powdered, and the fineness is controlled to be -250 micron ...

Embodiment 2

[0071] Example 2 Calcium raw material, sodium raw material and kaolin are mixed and roasted to prepare mineral-based soil remediation agent for remediation of soil severely polluted by lead, zinc and cadmium

[0072] Mix 315Kg of limestone mineral powder, 87Kg of sodium sulfate and 220kg of kaolinite mineral powder evenly, and roast in an induction furnace, controlling the roasting temperature not higher than 1450°C, roasting for 2 hours until molten, then pouring out, cooling, crushing, and powdering to obtain Mineral-based soil remediation agent B, the control fineness is -250 micron standard sieve ≥ 80%, the effective silicon in the mineral-based soil remediation agent B is 22%, the effective calcium is 41%, and the pH value is greater than 14.

[0073] ICP-OES analysis results

[0074] element content(%) element content(%) Ag <0.0005

Mo 0.0005 Au ---- Nb <0.001

Ba 0.047 Nd <0.0018

be 0.0002 Ni 0.002 Bi <0.001 ...

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Abstract

The invention provides a mineral-based soil remediation agent, and a preparation method and application thereof. The mineral-based soil remediation agent is prepared by mixing calcium raw materials, sodium raw materials and silicate minerals, and then performing calcination and crushing; or further performing water immersion treatment on the mineral-based soil remediation agent, then performing solid-liquid separation, and then drying the obtained solid. The effective silicon content (solubility in citric acid) in terms of SiO2 is more than or equal to 20 wt%, and the effective calcium contentin terms of CaO is more than or equal to 40 wt%, and the content of harmful elements such as Hg, As, Cd, Pb and Cr is lower than 50 ppm.

Description

technical field [0001] The invention relates to heavy metal polluted soil remediation technology and mineral material deep processing technology, in particular to a mineral-based soil remediation agent, its preparation method and application. Background technique [0002] Soil is an important part of the ecological environment and one of the main resources for human survival. In recent years, with the large-scale discharge of industrial waste residues, the irrigation of farmland with wastewater, the implementation of a large number of pesticides and phosphate fertilizers, more and more pollutants including heavy metals have entered the soil. Soil heavy metal pollution is concealed, accumulative, irreversible and long-term. The prevention and control of soil heavy metal pollution should not only control pollution sources, but also strengthen the restoration of polluted soil. European and American countries have invested a lot of manpower and material resources in the remedia...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/08C09K101/00C09K109/00
CPCC09K17/08C09K2101/00C09K2109/00
Inventor 刘耀驰曹正海汤育才张小宁
Owner HUNAN LONGE GALLOP TECH CO LTD