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A kind of soil heavy metal composite stabilizer and its passivation method to soil heavy metal

A composite stabilizer and heavy metal technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve the problems of large demand for phosphate fertilizer addition, single stabilization effect, and restrictions on wider application, etc. Reduce harm, realize the effect of resource utilization, preparation and use methods are simple and easy

Active Publication Date: 2017-09-29
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of phosphate fertilizer passivation treatment alone has certain limitations
Phosphate fertilizer has a good passivation effect on lead, but its effect on other heavy metals is weak, its stabilization effect is single, and it has certain selectivity to heavy metal elements
Phosphorus fertilizers are required to be added in large-scale pollution control, which usually exceeds the normal amount of field fertilization, which can easily cause the loss of phosphorus and bring environmental hazards of secondary pollution
Therefore, the selectivity of phosphate fertilizer to heavy metals, large application amount, high cost, and environmental risks all limit its wider application.

Method used

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  • A kind of soil heavy metal composite stabilizer and its passivation method to soil heavy metal
  • A kind of soil heavy metal composite stabilizer and its passivation method to soil heavy metal
  • A kind of soil heavy metal composite stabilizer and its passivation method to soil heavy metal

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A soil heavy metal pollution composite stabilizer comprises the following components, each component is by mass percentage:

[0056] Carbide slag 35%, fungus slag 57% and superphosphate 8%.

[0057] The passivation method of the soil heavy metal composite stabilizer to soil heavy metals is a complete mixed treatment method, comprising the following steps:

[0058] Step 1, mixing 17.5g of calcium carbide slag, 28.5g of fungus residue and 4g of superphosphate, fully stirring to obtain a composite stabilizer;

[0059] Step 2. Mix 50 g of the composite stabilizer in step 1 with 500 g of soil polluted by heavy metals, stir evenly, add 40% water according to the air-dried quality of the soil, and keep the soil at a certain humidity;

[0060] Step 3: After 7 days of reaction, the heavy metal ions in the polluted soil are transformed into relatively stable basic carbonates, hydroxide precipitates, phosphate minerals and insoluble heavy metal-organic complexes. The leaching to...

Embodiment 2

[0064] A soil heavy metal pollution composite stabilizer comprises the following components, each component is by mass percentage:

[0065] Carbide slag 35%, fungus slag 57% and superphosphate 8%.

[0066] The passivation method of the soil heavy metal composite stabilizer to soil heavy metals is a separate dosing method, comprising the following steps:

[0067] Step 1. Mix 17.5g of calcium carbide slag with 500g of soil polluted by heavy metals, stir evenly, passivation is stable for 3 days, add 40% water according to the air-dried quality of the soil, and keep the soil at a certain humidity;

[0068] Step 2, mix 4g of superphosphate with the mixture obtained in step 1, stir evenly, passivation is stable for 3 days, and keep the soil moisture content the same as step 1;

[0069] Step 3: Mix 28.5g of the fungus residue with the mixture obtained in Step 2, stir evenly, passivation is stable for 7 days, keep the soil moisture content the same as Step 1, and the heavy metal ions...

Embodiment 3

[0074] Effects of different ratios of compound stabilizers on the stabilization efficiency of heavy metals in soil:

[0075] A soil heavy metal composite stabilizer is composed of the following three raw materials in different mass percentages:

[0076] Table 3 Composite stabilizers with different ratios

[0077]

[0078] The passivation method of the soil heavy metal composite stabilizer to soil heavy metals is a complete mixed treatment method, comprising the following steps:

[0079] Step 1, mix calcium carbide slag, fungus slag and superphosphate according to the ratio of above-mentioned table 3, fully stir and make composite stabilizer;

[0080] Step 2. Mix 55.55 g of the composite stabilizer in step 1 with 500 g of soil polluted by heavy metals, stir evenly, add 40% water according to the air-dried quality of the soil, and keep the soil at a certain humidity;

[0081] Step 3: After 7 days of reaction, the heavy metal ions in the polluted soil are transformed into re...

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Abstract

The invention relates to the field of soil heavy metal passivation, and especially relates to a soil heavy metal compound stabilizer and a method using the soil heavy metal compound stabilizer for passivation of soil heavy metals, and the soil heavy metal compound stabilizer comprises the following components by weight: 8%-40% of carbide slag, 45%-70% of bacteria residue and 8%-28% of calcium superphosphate. The soil heavy metal compound stabilizer can be used for passivation of the soil heavy metals. The soil heavy metal compound stabilizer is low in cost, simple in operation, wide in sources, and easy in popularization, can be used for passivation stabilization of a variety of soil heavy metals, can reach the objective of fertilizing soil and improving soil properties, and is capable of solid waste reuse of the carbide slag and the bacteria residue.

Description

technical field [0001] The invention relates to the field of soil heavy metal passivation, in particular to a soil heavy metal composite stabilizer and a passivation method for soil heavy metals. Background technique [0002] In recent years, with the continuous advancement of industrialization and urbanization in China, the problem of soil pollution has become increasingly serious. Heavy metal pollution can not only cause changes in soil composition, structure and function, but also inhibit crop root growth and photosynthesis, resulting in crop yield reduction or even failure . More importantly, heavy metals may also migrate to animals and humans through the food chain, seriously endangering the health of animals and humans. The hazards of heavy metal pollution such as cadmium rice, arsenic poisoning, and blood lead have been frequently reported in recent years. Soil heavy metal pollution has become one of the public issues that have attracted much attention in soil pollut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/40B09C1/08A62D3/33A62D101/43
CPCA62D3/33A62D2101/43B09C1/08C09K17/40
Inventor 吴烈善曾东梅吴蒙孔德超
Owner GUANGXI UNIV
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