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Treatment method for phosphated residues, soil restoration agent and method for reducing content of cadmium in rice

The technology of a soil remediation agent and a treatment method is applied in the field of reducing the cadmium content in rice, which can solve the problems of discarding or discharging with water, environmental pollution and the like, and achieves the effects of reducing the preparation cost, reducing the cadmium content and increasing the growth rate.

Active Publication Date: 2016-08-10
SHANGHAI LICHANG ENVIRONMENTAL ENG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of these enterprises use simple stockpiling or simple landfill methods to dispose of phosphating slag, or some enterprises discard these paint slags or discharge them with water, causing environmental pollution

Method used

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  • Treatment method for phosphated residues, soil restoration agent and method for reducing content of cadmium in rice
  • Treatment method for phosphated residues, soil restoration agent and method for reducing content of cadmium in rice
  • Treatment method for phosphated residues, soil restoration agent and method for reducing content of cadmium in rice

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A soil restoration agent, which is prepared by mixing 40% phosphating slag, 5% calcium polysulfide, 3% sulfamic acid, 6% humic acid and 46% silicate clay.

[0025] The appearance of the soil remediation agent is gray granular solid, and the pH is 8.03 when the solid-to-liquid ratio (weight ratio to water) is 1:2.5.

Embodiment 2

[0027] A soil restoration agent, which is prepared by mixing 25% phosphating slag, 6% calcium polysulfide, 5% sulfamic acid, 10% humic acid and 54% silicate clay.

[0028] The appearance of the soil remediation agent is gray granular solid, and the pH is 8.52 when the solid-liquid ratio is 1:2.5.

Embodiment 3

[0030] A soil restoration agent, which is prepared by mixing 20% ​​phosphating slag, 6% calcium polysulfide, 3% sulfamic acid, 6% humic acid and 65% silicate clay.

[0031] The appearance of the soil remediation agent is gray granular solid, and the pH is 8.06 when the solid-liquid ratio is 1:2.5.

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Abstract

The invention provides a treatment method for phosphated residues and a soil restoration agent with the effects of adsorbing and fixing heavy metal ions, especially cadmium .The invention further relates to a method for reducing the content of cadmium in rice .The soil restoration agent is prepared by mixing 20-50% of phosphated residues, 5-20% of sulfur-containing compounds, 1-5% of sulfamic acid, 5-10% of humic acid and 15-69% of silicate clay .The soil restoration agent is low in cost and good in heavy metal ion removal effect, soil improved through the soil restoration agent is very suitable for planting the rice, and the advantages that the content of heavy metals, especially cadmium in the rice is reduced, the growth speed of the rice is high, and the yield is high are achieved .

Description

technical field [0001] The invention relates to a treatment method for phosphating slag and a soil restoration agent capable of absorbing and fixing heavy metal ions, especially cadmium. The invention also relates to a method for reducing cadmium content in rice. Background technique [0002] With the development of my country's machinery industry, metal surface treatment enterprises have also developed and grown. In the field of steel industry and machinery manufacturing industry, due to the need for rust removal and coating, pickling and phosphating processes are generally adopted. Phosphating of metal products is an important process in the metal surface treatment process. The phosphating process is mainly to form a phosphating film on the metal surface. At the same time, due to the action of acid and the metal surface, some deposits are also produced, which are called phosphating slag. The production of phosphating slag not only consumes a large amount of film-forming s...

Claims

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Application Information

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IPC IPC(8): C09K17/40C09K17/02C09K17/08B09C1/08A01G16/00C09K101/00A01G22/22
CPCA01G22/22B09C1/08B09C2101/00C09K17/02C09K17/08C09K17/40C09K2101/00
Inventor 许海尤国彪谢爱军高素萍
Owner SHANGHAI LICHANG ENVIRONMENTAL ENG
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