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Remediation modifier for heavy-metal cadmium polluted soil and preparation method of remediation modifier

A technology for cadmium-contaminated soil and heavy metals, applied in soil conditioning materials, chemical instruments and methods, urea compound fertilizers, etc., can solve problems such as single function, complicated application methods, and limited use conditions, and achieve reduced bulk density and improved application methods. Simple, hard-to-absorb effect

Inactive Publication Date: 2018-05-18
INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the technical problem to be solved in the present invention is to overcome the shortcomings of the heavy metal-contaminated soil remediation agent in the prior art, such as single function, limited use conditions, and complicated application methods, thereby providing a heavy metal cadmium-contaminated soil remediation improver and its preparation method

Method used

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  • Remediation modifier for heavy-metal cadmium polluted soil and preparation method of remediation modifier

Examples

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Effect test

Embodiment 1

[0030] A heavy metal cadmium polluted soil repair and improvement agent, comprising the following components by weight: 1 part of urea, 8 parts of superphosphate, 1 part of potassium chloride, 6 parts of lime, 0.4 parts of wood vinegar, 70 parts of biochar, powder 18 parts of coal ash. The preparation method is as follows: (1) take wheat straw as raw material and pyrolyze it in a carbonization furnace at 700 DEG C for 4 hours to obtain biochar, and then grind and sieve the biochar to obtain 40-60 mesh samples. At the same time, during the pyrolysis process, the straw will produce pyrolyzed volatiles, which are sent to the cooler for cooling and collection to obtain condensed liquid, that is, wood vinegar, and the cooling temperature is normal temperature. (2) The purchased urea, superphosphate, potassium chloride and lime are ground and passed through a 40-60 mesh sieve to obtain a sample. The fly ash comes from a power plant, and the fly ash is directly passed through a 40-6...

Embodiment 2

[0032] A heavy metal cadmium polluted soil repair and improvement agent, comprising the following components by weight: 2 parts of urea, 6 parts of superphosphate, 2 parts of potassium chloride, 4 parts of lime, 0.6 parts of wood vinegar, 74 parts of biochar, powder 14 parts of coal ash. The preparation method is as follows: (1) taking corn stalks as raw materials and pyrolyzing them in a carbonization furnace at 400° C. for 6 hours to obtain biochar, and then grinding and sieving the biochar to obtain 40-60 mesh samples. At the same time, during the pyrolysis process, the straw will produce pyrolyzed volatiles, which are sent to the cooler for cooling and collection to obtain condensed liquid, that is, wood vinegar, and the cooling temperature is normal temperature. (2) The purchased urea, superphosphate, potassium chloride and lime are ground and passed through a 40-60 mesh sieve to obtain a sample. The fly ash comes from a power plant, and the fly ash is directly passed th...

Embodiment 3

[0034] A heavy metal cadmium polluted soil repairing and improving agent, comprising the following components by weight: 1.8 parts of urea, 7 parts of superphosphate, 1.3 parts of potassium chloride, 5 parts of lime, 0.5 parts of wood vinegar, 72 parts of biochar, powder 16 parts of coal ash. The preparation method is as follows: (1) using rice stalks as raw materials to pyrolyze in a carbonization furnace at 600 DEG C for 5 hours in the absence of oxygen to prepare biochar, and then grind and sieve the biochar to obtain 40-60 mesh samples. At the same time, during the pyrolysis process, the straw will produce pyrolyzed volatiles, which are sent to the cooler for cooling and collection to obtain condensed liquid, that is, wood vinegar, and the cooling temperature is normal temperature. (2) The purchased urea, superphosphate, potassium chloride and lime are ground and passed through a 40-60 mesh sieve to obtain a sample. The fly ash comes from a power plant, and the fly ash is...

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Abstract

The invention belongs to the technical field of agricultural fertilizer, and particularly relates to a remediation modifier for heavy-metal cadmium polluted soil and a preparation method of the remediation modifier. The provided remediation modifier for the heavy-metal cadmium polluted soil is prepared from the following components in parts by weight: 1-2 parts of urea, 6-8 parts of calcium superphosphate, 1-2 parts of potassium chloride, 4.6 parts of lime, 0.4-0.6 parts of wood vinegar, 70-74 parts of biochar and 14-18 parts of fly ash. The components are cooperative and synergistic in a specific ratio, and effects of improving soil fertility, increasing crop yield and reducing enrichment of cadmium in crops are achieved. The fly ash, the biochar and the wood vinegar are used cooperatively with conventional fertilizer, nutrients are maintained, fertilizer efficiency period is prolonged, absorption of nutrients by crops is promoted, and crop yield is increased. The lime, the fly ash and the biochar are used cooperatively, heavy metal cadmium can be effectively fixed in the biochar and the fly ash, and the content of cadmium in the crops is effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of agricultural fertilizers, and in particular relates to a heavy metal cadmium polluted soil repairing and improving agent and a preparation method thereof. Background technique [0002] With the accelerated development of industrialization and urbanization in China, heavy metal pollution such as cadmium in my country's farmland soil is becoming more and more serious. Heavy metal pollution such as cadmium in soil has a wide range of pollution, long duration, hidden pollution, and cannot be biodegraded. The food chain is enriched in organisms and other characteristics, which in turn causes cadmium-contaminated farmland rice and other agricultural products to exceed the standard. [0003] At present, the remediation technologies mainly used in soil heavy metal pollution include immobilization / stabilization technology and vitrification technology. Chemical form and occurrence state, increase the adsorption sit...

Claims

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Application Information

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IPC IPC(8): C05G3/04C09K17/40C09K101/00C09K109/00C05G3/80
CPCC05B1/02C05G3/80C09K17/40C09K2101/00C09K2109/00C05C9/00C05D1/02
Inventor 陈院华吕贵芬侯红乾刘秀梅杨涛李建国
Owner INST OF SOIL FERTILIZER & RESOURCE ENVIRONMENT JIANGXI ACAD OF AGRI SCI
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