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Passivator for heavy metal in farmland soil and preparation method thereof

A heavy metal passivator and soil technology, applied in chemical instruments and methods, soil conditioning materials, agriculture, etc., can solve the problems of ineffective soil remediation, uneconomical and reasonable treatment and maintenance costs, burning seedlings, etc., to prevent the spread of and occurrence, reduce absorption, improve soil fertility

Inactive Publication Date: 2020-07-28
武汉市秀谷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soil environmental pollution is affected by many factors, soil pollution has become complex and diverse, and the traditional single remediation agent has no obvious effect on the remediation of contaminated soil
[0003] Farmland passivation agents fix and passivate heavy metals in soil through physical and chemical methods to reduce their migration in farmland. However, the common CaO passivators on the market are prone to seedling burning, and the treatment and maintenance costs are not enough. economically reasonable

Method used

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  • Passivator for heavy metal in farmland soil and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The raw materials of the heavy metal passivator for farmland soil: goethite 30kg, sepiolite 30kg, quicklime 25kg, silicate 15kg, phosphate rock powder 5kg, attapulgite 2kg, chitosan 2kg.

[0024] The preparation method of above-mentioned raw material is: (1) each raw material is weighed according to above-mentioned consumption, mix, standby;

[0025] (2) the material obtained in step (1) was calcined at 1100 ° C for 2 h, for subsequent use;

[0026] (3) The material obtained in step (2) was dried at 100° C. for 30 minutes, and ground to a particle size of 200 μm to obtain a heavy metal passivator for farmland soil.

Embodiment 2

[0028] The raw materials of the heavy metal passivator for farmland soil: goethite 40kg, zeolite 40kg, quicklime 35kg, silicate 18kg, phosphate rock powder 10kg, attapulgite 5kg, chitosan 6kg.

[0029] The preparation method of above-mentioned raw material is: (1) each raw material is weighed according to above-mentioned consumption, mix, standby;

[0030] (2) calcining the material obtained in step (1) at 1200° C. for 3h, for subsequent use;

[0031] (3) drying the material obtained in step (2) at 120° C. for 50 min, and grinding to a particle size of 300 μm to obtain a heavy metal passivator for farmland soil.

Embodiment 3

[0033] The raw materials of the heavy metal passivator for farmland soil: goethite 35kg, smectite 35kg, quicklime 28kg, silicate 16kg, phosphate rock powder 7kg, attapulgite 2kg, chitosan 2kg.

[0034] The preparation method of above-mentioned raw material is: (1) each raw material is weighed according to above-mentioned consumption, mix, standby;

[0035] (2) calcining the material obtained in step (1) at 1350° C. for 3h, for subsequent use;

[0036] (3) drying the material obtained in step (2) at 110° C. for 40 min, and grinding to a particle size of 250 μm to obtain a heavy metal passivator for farmland soil.

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Abstract

The invention discloses a passivator for heavy metal in farmland soil. The passivator comprises the following raw materials in parts by weight: 30-40 parts of iron-based minerals, 30-40 parts of clayminerals, 25-35 parts of quick lime, 15-18 parts of silicate, 5-10 parts of ground phosphate rock, 2-5 parts of attapulgite and 2-6 parts of chitosan. The passivator can effectively reduce the heavy metal pollution degree of the soil, improve a soil structure and enhance soil fertility.

Description

technical field [0001] The invention relates to the technical field of soil heavy metal pollution remediation, and more particularly to a farmland soil heavy metal passivator and a preparation method thereof. Background technique [0002] Heavy metal pollution in farmland is soil pollution caused by excessive deposition of heavy metals in the soil. Heavy metals polluting farmland soil mainly include mercury, cadmium, lead, chromium and metalloid arsenic and other elements with significant biological toxicity, as well as certain toxic elements such as zinc, copper and nickel, mainly from mining waste residue, pesticides, wastewater, sludge and Atmospheric deposition, etc. Excessive heavy metals can cause plant physiological function disorders and nutritional disorders. The enrichment coefficients of cadmium, mercury and other elements in crop seeds are high. Even if they exceed food hygiene standards, they will not affect crop growth, development and yield. Heavy metal pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40C05G3/80C09K101/00C09K109/00
CPCC05B17/00C09K17/40C09K2101/00C09K2109/00
Inventor 冯才声张质
Owner 武汉市秀谷科技有限公司
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