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Preparation method of composite heavy metal contaminated site improver

A technology of heavy metals and modifiers, applied in chemical instruments and methods, fertilizer mixtures, fertilizers made of biological waste, etc., can solve the problems of poor passivation performance and poor durability of modifiers, and achieve improved passivation performance and passivation chemical stability, low cost, and the effect of enhancing passivation stability

Active Publication Date: 2020-08-11
JIANGXI ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims at the problems of poor passivation performance and poor durability of the above-mentioned modifiers, develops a process to improve the passivation effect of existing passivators, integrates the performance of various materials, and enhances the chemical stability of materials while exerting synergistic enhancement of passivation performance function, providing a composite method of cellulose-based biomass, calcium-based biomass and phosphate fertilizer suitable for heavy metal-contaminated sites

Method used

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  • Preparation method of composite heavy metal contaminated site improver
  • Preparation method of composite heavy metal contaminated site improver
  • Preparation method of composite heavy metal contaminated site improver

Examples

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Effect test

Embodiment 1

[0038] Take fresh rice straw, wash it with water, dry to constant weight, crush, and sieve, take 260-74μm rice straw, use egg shell as calcium-based biomass, grind, sieve, take 74μm or more for pretreatment, and use 0.5 The nitric acid solution of mol / L is the solvent, the weight ratio of rice straw powder and egg shell powder is 2:1, the mixed solid weight and solvent volume ratio is 1:3kg / L, and at room temperature, the premixing time is 2h at 150rpm. Calcium phosphate as the main component and calcium dihydrogen phosphate as the main component of the phosphorus source of the mixed phosphate fertilizer, the mass ratio of calcium phosphate and calcium dihydrogen phosphate is 1:1, the particle size of calcium phosphate is more than 74 μm, and 1mol / L phosphoric acid The solution is a solvent, and the solid-to-liquid ratio is 1:5kg / L for mixing, dissolving and dispersing. The reaction temperature is 50°C and 200rpm for 4h. The mixed solution of the pretreated phosphate fertilize...

Embodiment 2

[0042] Take commercially available rice husk charcoal, grind and sieve, take 149 μm rice husk charcoal, use N,N-dimethylformamide solution as solvent, and use calcium hydrogen phosphate as the main component and mixed phosphate fertilizer with calcium dihydrogen phosphate as the main component As a phosphorus source, the mass ratio of calcium hydrogen phosphate to calcium dihydrogen phosphate is 2:1, the weight ratio of rice husk charcoal to phosphate fertilizer is 3:1, and 0.1mol / L nitric acid-sulfuric acid solution and N,N-dimethyl Dimethylformamide mixed solution is used as solvent, the volume ratio of 0.1mol / L nitric acid-sulfuric acid solution to N,N-dimethylformamide solution is 1:1, and the volume ratio of mixed solid weight to solvent is 1:10 for mixing and dissolving , the pretreatment temperature was room temperature, and the reaction was performed at 200rpm for 2h. Then use shell powder as calcium-based biomass, the particle size of shell powder is more than 74 μm, ...

Embodiment 3

[0046] Take camphor wood chips, rinse with water, dry to constant weight, crush, sieve, take camphor wood chips over 149 μm and 0.1mol / L sodium hydroxide solution at a solid-to-liquid ratio of 1:2, at room temperature, 150rpm Premixing time is 2h. The phosphate fertilizer with calcium dihydrogen phosphate as the main component is the phosphorus source, and the egg shell is used as the calcium-based biomass, crushed and sieved, and the 74 μm or more is used for the experiment. The weight ratio of the phosphate fertilizer and the egg shell is based on Ca: P molar ratio = 1.7 Calculate the proportion, use 0.5mol / L phosphoric acid solution as the solvent, mix and dissolve the mixed solid weight to solvent volume ratio of 1:5kg / L, and react for 1h at the reaction temperature of 30°C and 200rpm. Then the pretreated sawdust solution was gradually added to the mixed system of phosphate fertilizer and egg shell, and the acidity was controlled by adding sodium hydroxide solution dropwis...

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Abstract

The invention relates to the field of material preparation in environmental pollution control, in particular to a preparation method of a composite heavy metal contaminated site improver. According tothe method, biomass and phosphate fertilizer are compounded; phosphate fertilizer is effectively used for improving the passivation effect of the biomass improver on soil heavy metal, the chemical stability of a biomass material is enhanced, the synergistic enhancement effect of passivation performance is achieved, and cellulose-based biomass and calcium-based biomass material and phosphate fertilizer compounding is completed through three processes of biomass pretreatment, phosphate fertilizer dissolution or dispersion and biomass-phosphate fertilizer compounding. According to the invention,a three-dimensional network structure of biomass is effectively utilized; a calcium source provided by the calcium-based biomass is fully utilized; phosphate radical plays a role in passivating heavymetals and provides a phosphorus source for contaminated soil with low available phosphorus content, the composite improver with stable properties is prepared, the passivation durability of the composite improver on the heavy metals is obviously enhanced compared with that of a calcium-based improver and a phosphorus-containing improver, and the composite improver has the advantages of simple preparation process, low cost, excellent passivation performance and the like.

Description

technical field [0001] The invention relates to the field of material preparation in environmental pollution control, in particular to a preparation method of a compound modifier for heavy metal polluted sites. Background technique [0002] The problem of heavy metal pollution in soil is serious in my country. According to statistics, one-fifth of the country's cultivated land is polluted by heavy metals. Heavy metal pollution poses a serious threat to the ecological environment and human health. At present, heavy metal-contaminated soil is basically restored by removal or passivation measures. Removal is to use hyperaccumulative plants or leaching methods to reduce soil cadmium stocks. Among them, hyperaccumulative phytoremediation can only be planted before winter fallow or spring plowing, and there is a long implementation period. , large labor input and other issues. The leaching method has a good effect on soil cadmium removal, but there are problems such as large amou...

Claims

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Application Information

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IPC IPC(8): C09K17/40C05G3/00C05G3/80C09K101/00
CPCC05B7/00C05G3/00C09K17/40C09K2101/00C05G3/80C05B17/00C05C11/00C05D9/00C05F1/007C05F11/00C05C3/00C05F5/002
Inventor 李晓晖吴永明孙小艳艾仙斌王玺洋
Owner JIANGXI ACADEMY OF SCI
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