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Preparing method for complex function repairing agent for treatment of heavy metal contaminated soil

A technology with complex functions and polluted soil, which is applied in the field of soil pollution control, can solve problems such as unscientific proportioning of chemicals, damage to soil fertility, long repair period, etc., and achieve the effect of long-term stabilization of heavy metals, small amount of use, and low cost

Inactive Publication Date: 2016-03-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the commonly used chemical passivation materials mainly include phosphate, carbonate, silicate and clay minerals, but the existing such technologies, such as application numbers, are 201110125022, 201210458846.0, 201110246042.X, 201210267704.6, 201110125022.7, 201310333523.3 Most of the Chinese invention patents are used after simple mixing of the above components, and there are disadvantages such as unscientific dosage ratio, large usage, long repair cycle, poor long-term effect, high price, and easy damage to soil fertility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Roast the dried rice husk for 2 hours at 450°C under air-isolated conditions, and the cooled and ground particle size is less than 100 mesh. Proportion the above-prepared rice husk charcoal powder with quicklime and diatomite raw materials according to the weight ratio of 0.1:0.5:0.4, take 10g of the above mixture, add 100mL of water, stir and age for 2h, then heat in a hydrothermal reaction kettle Pressurized synthesis, the synthesis temperature is 140°C, the synthesis pressure is 6Mpa, the synthesis time is 4h, filtered and cooled, the filtered solid is dried at 105°C, and ground to a size of not less than 100 mesh to obtain material A.

[0023] (2) Take 10g of material A, add it to 100mL of a solution with a phosphate concentration of 250mg / L, react for 6 hours at room temperature, and stir at 200r / min, then filter, dry the filtered solid at 105°C, and grind it 100 mesh, promptly obtains the complex functional restorative agent.

[0024] Select Cu 2+ Contaminat...

Embodiment 2

[0026] (1) Roast the dried corn stalks for 2 hours at 400°C in the absence of air, and the cooled and ground particle size is less than 100 mesh. Proportion the above-prepared rice husk charcoal powder with quicklime and sodium silicate raw materials according to the weight ratio of 0.05:0.6:0.35, take 10g of the above mixture, add 100mL of water, stir and age for 2h, then heat in a hydrothermal reaction kettle Pressurized synthesis, the synthesis temperature is 170°C, the synthesis pressure is 10Mpa, the synthesis time is 4h, filtered and cooled, the filtered solid is dried at 105°C, and ground to a size of not less than 100 mesh to obtain material A.

[0027] (2) Take 10g of material A, add it to 100mL of a solution with a phosphate concentration of 500mg / L, react for 4 hours at room temperature, and stir at 200r / min, then filter, dry the filtered solid at 105°C, and grind it to a size not less than 100 mesh, promptly obtains the complex functional restorative agent.

[002...

Embodiment 3

[0030] (1) Roast the dried peanut shells at 500°C for 2 hours in the absence of air, and the cooled and ground particle size is less than 100 mesh. Proportion the above-prepared rice husk charcoal powder with quicklime and diatomite raw materials according to the weight ratio of 0.1:0.4:0.5, take 10g of the above mixture, add 100mL of water, stir and age for 2h, then heat in a hydrothermal reaction kettle Pressurized synthesis, the synthesis temperature is 200°C, the synthesis pressure is 12Mpa, the synthesis time is 3h, filtered and cooled, the filtered solid is dried at 105°C, and ground to a size of not less than 100 mesh to obtain material A.

[0031] (2) Take 10g of material A, add it to 100mL of a solution with a phosphate concentration of 250mg / L, react for 5 hours at room temperature, and stir at 200r / min, then filter, dry the filtered solid at 105°C, and grind it to a size not less than 100 mesh, promptly obtains the complex functional restorative agent.

[0032] Cho...

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Abstract

The invention relates to a preparing method for a complex function repairing agent for treatment of heavy metal contaminated soil. Biomass charcoal, quick lime and a siliceous material serve as raw materials, biomass charcoal based tobermorite is synthesized through a hydrothermal reaction, and a biomass charcoal based hydroxyl calcium phosphate complex agent can be generated by biomass charcoal based tobermorite in a phosphate solution. In land utilization, the complex agent has the function of enhancing soil fertility and can also effectively stabilize heavy metal ions in the soil, the mobility and the bio-availability of heavy metal are reduced to the maximum, and the purpose of in-situ repair of the heavy metal contaminated soil is achieved. The prepared complex function repairing agent has the advantages of being high in content of active ingredients, long in heavy metal stabilizing effect, wide in application range, small in using quantity, easy to prepare, low in cost and the like, and can be used for long-acting on-situ repair of farmland heavy metal contaminated soil or other industrial heavy metal contaminated soil.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a preparation method of a composite function restoration agent for heavy metal polluted soil control. Background technique [0002] With the development of industry and the modernization of agricultural production, soil pollution is becoming more and more serious. Soil heavy metal pollution comes from a wide range of sources, including mining, smelting, metal processing, chemical industry, waste battery treatment, electronics, tanning and dyeing, and other industrial wastes, vehicle exhaust emissions, and the application of pesticides and fertilizers. The accumulation of harmful heavy metals in the soil to a certain extent will cause toxicity to the soil plant system, which not only leads to soil degradation, reduction of crop yield and quality, but also pollutes surface water and groundwater through runoff and leaching, deteriorates the hydrological en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/06C09K101/00
CPCC09K17/06C09K2101/00
Inventor 王学江王浩夏鹏景焕平宋靖珂王佳忆成雪君张志昊赵建夫夏四清
Owner TONGJI UNIV
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