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Agricultural composite passivator for soil heavy metal remediation

A technology of heavy metals and passivators, applied in the fields of application, agriculture, fertilizer mixture, etc., to achieve efficient, fast and stable results

Inactive Publication Date: 2017-05-31
SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The serious consequences of heavy metal pollution make the treatment of heavy metal polluted sites an urgent task to be solved

Method used

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  • Agricultural composite passivator for soil heavy metal remediation

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Embodiment 1

[0017] This embodiment provides a kind of compound passivation agent that is used for agricultural soil heavy metal remediation, is made by mixing the components of following percentage by weight: 8% starch xanthate, 16% potassium sulfate, 16% diammonium phosphate and 60% Deionized water.

[0018] In this embodiment, potassium sulfate may also be potash fertilizers such as potassium chloride and potassium carbonate.

[0019] In this embodiment, the diammonium phosphate may also be soluble phosphate such as ammonium dihydrogen phosphate.

[0020] Wherein, the preparation process of starch xanthate is:

[0021] Step 1. Mix the coarse starch and 1% sodium chloride solution by mass evenly, heat to 40° C., and react for 8 hours. The ratio of coarse starch to 1% sodium chloride solution is 15g:22.5mL.

[0022] Step 2: adding deionized water to dilute, then adding 15% sodium hydroxide solution, and adding epichlorohydrin dropwise, heating to 45° C., and reacting for 8 hours. The ...

Embodiment 2

[0027] The present embodiment provides a kind of compound passivation agent that is used for agricultural soil heavy metal remediation, is made by mixing the components of following percentage by weight: 6% starch xanthate, 20% potassium chloride, 14% ammonium dihydrogen phosphate and 60% deionized water.

[0028] In this embodiment, potassium chloride may also be potash fertilizers such as potassium sulfate and potassium carbonate.

[0029] In this embodiment, the ammonium dihydrogen phosphate may also be a soluble phosphate such as diammonium phosphate.

[0030] Wherein, the preparation process of starch xanthate is:

[0031] Step 1. Mix the coarse starch and 1% sodium chloride solution by mass evenly, heat to 45° C., and react for 8 hours. The ratio of coarse starch to 1% sodium chloride solution is 15g:22.5mL.

[0032] Step 2: adding deionized water to dilute, then adding 15% sodium hydroxide solution, and adding epichlorohydrin dropwise, heating to 45° C., and reacting...

Embodiment 3

[0037] The present embodiment provides a kind of compound passivation agent that is used for agricultural soil heavy metal remediation, is made by mixing the components of following percentage by weight: 8% starch xanthate, 20% potassium carbonate, 12% diammonium phosphate and 60% Deionized water.

[0038] In this embodiment, potassium carbonate may also be potash fertilizers such as potassium sulfate and potassium chloride.

[0039] In this embodiment, the diammonium phosphate may also be soluble phosphate such as ammonium dihydrogen phosphate.

[0040] Wherein, the preparation process of starch xanthate is:

[0041] Step 1. Mix the coarse starch and 1% sodium chloride solution by mass evenly, heat to 50° C., and react for 8 hours. The ratio of coarse starch to 1% sodium chloride solution is 15g:22.5mL.

[0042] Step 2: adding deionized water to dilute, then adding 15% sodium hydroxide solution, and adding epichlorohydrin dropwise, heating to 45° C., and reacting for 8 hou...

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Abstract

The invention discloses an agricultural composite passivator for soil heavy metal remediation. The agricultural composite passivator is prepared by mixing the following components by weight percent: 5-8% of starch xanthate, 10-20% of dissolved fertilizer, 10-18% of soluble phosphate, and 55-75% of deionized water. The invention provides a composite passivator for soil heavy metal remediation, which is economic, efficient, and green. The composite passivator stabilizes harmful heavy metals in soil efficiently and rapidly, and provides condition for soil fertilizer conservation to allow quick reuse of polluted soil. The composite passivator is especially suitable for remediation of heavy metal pollution of lean soil.

Description

technical field [0001] The invention belongs to the field of chemical restoration of heavy metal pollution, and relates to a passivator, in particular to a composite passivator for agricultural soil heavy metal restoration. Background technique [0002] With the acceleration of urbanization and the adjustment of industrial structure, more than 500,000 "brownfields" left over from the relocation of industrial enterprises in my country have become a limiting factor for the safe reuse of land resources in many large and medium-sized cities. Due to the discharge of industrial wastewater and metal smelting for a long time, the sites polluted by heavy metals are increasing. The serious consequences of heavy metal pollution make the treatment of heavy metal contaminated sites an urgent task to be solved. At present, the area of ​​arable land polluted by heavy metals in my country is about 150 million mu; the amount of food polluted by heavy metals in the country is as high as 12 m...

Claims

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Application Information

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IPC IPC(8): C05G3/04C08B31/04C05G3/80
CPCC05B7/00C05G3/80C08B31/04C05D1/02C05D1/00
Inventor 赵九娟夏辉鹏张金山夏志先
Owner SHANGHAI FENGXIN ENVIRONMENTAL PROTECTION TECH