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Soil heavy metal passivator, preparation method thereof, and passivation method thereof on soil cadmium

A technology of heavy metal passivation agent and soil conditioner, which is applied in the direction of chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc. It can solve the problems of high repair cost and limited heavy metal adsorption, and achieves a simple and easy preparation method line, improve utilization rate and long-term stability, and improve soil fertility

Active Publication Date: 2016-07-27
SICHUAN SHILIWANG AGRI SCI & TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, unmodified natural minerals have a limited amount of adsorption on heavy metals, and agricultural wastes must be selected from agricultural wastes that are not polluted by heavy metals, but this will cause transportation costs and high repair costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A soil heavy metal passivator of the present invention comprises the following components in parts by weight: 30 parts of modified alkaline minerals, 10 parts of decomposed straw, 1 part of soil conditioner, 1 part of polystyrene gel, 5 parts of phosphogypsum, 0.1 part of graphene; the soil conditioner is composed of humic acid, fly ash, biochar and esterified starch in a mass ratio of 3:2:1:1.

[0030] A kind of preparation method of the soil heavy metal passivation of above-mentioned present embodiment, comprises the following steps:

[0031] (1) Preparation of modified alkaline minerals: send 30 parts by weight of nepheline rock into a ball mill for crushing and grinding, and pass through a 100-300 mesh sieve; send it into a powder surface modification machine, and add 5 Dodecyltrimethylammonium chloride in parts by weight is heated at 120°C and stirred and mixed at a speed of 5000rpm for 10min to coat the surface of nephelineite with a modifier to obtain modified al...

Embodiment 2

[0036] A soil heavy metal passivator of the present invention comprises the following components in parts by weight: 40 parts of modified alkaline minerals, 10 parts of decomposed fruit pomace, 3 parts of soil conditioner, 2 parts of polyacrylic acid gel, 4 parts of phosphogypsum, 0.5 part of graphene; the soil conditioner is composed of humic acid, fly ash, biochar and esterified starch in a mass ratio of 3:3:1:1.

[0037] A kind of preparation method of the soil heavy metal passivation of above-mentioned present embodiment, comprises the following steps:

[0038] (1) Preparation of modified alkaline minerals: put 20 parts by weight of leucite rock and 20 parts by weight of calcite into a ball mill for crushing and grinding, pass through a 100-300 mesh sieve; send them into a powder surface modification machine , add 10 parts by weight of cetyltrimethylammonium bromide through the feeding device, heat at 100 ° C, stir and mix at a speed of 3000 rpm for 30 minutes, so that the s...

Embodiment 3

[0043] A soil heavy metal deactivator of the present invention comprises the following components in parts by weight: 50 parts of modified alkaline minerals, 15 parts of decomposed traditional Chinese medicine dregs, 6 parts of soil conditioner, 5 parts of carboxymethyl chitosan Sugar gel, 1 part of phosphogypsum, 1 part of graphene; the soil conditioner is composed of humic acid, fly ash, biochar and esterified starch in a mass ratio of 4:2:3:1 .

[0044] A kind of preparation method of the soil heavy metal passivation of above-mentioned present embodiment, comprises the following steps:

[0045] (1) Preparation of modified alkaline minerals: send 40 parts by weight of potassium feldspar into a ball mill for pulverization and grinding, and pass through a 100-300 mesh sieve; send it into a powder surface modification machine, and add 10 Octadecyltrimethylammonium chloride in parts by weight is heated at 150° C., stirred and mixed at a speed of 1000 rpm for 40 minutes, so that...

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Abstract

The invention belongs to the technical field of heavy metal pollution soil restoration, and particularly relates to a soil heavy metal passivator, a preparation method thereof, and a passivation method thereof on soil cadmium. The soil heavy metal passivator provided by the invention is prepared from the following materials in parts by weight: 30 to 50 parts of modified alkali minerals, 10 to 15 parts of rotten agriculture and forestry wastes, 1 to 10 parts of soil conditioners, 1 to 5 parts of pH sensitive gel, 1 to 5 parts of phosphogypsum, and 0.1 to 5 parts of graphene. The soil heavy metal passivator provided by the invention has stronger adsorbing and chelating functions, can effectively fix heavy metal cadmium in the soil, and prevents effective cadmium from entering into crops; regulation can be carried out according to the soil pH, so that the utilization ratio and the long-term stability of the soil heavy metal passivator are improved; meanwhile, with an added soil conditioner, the soil environment can be improved, and the soil fertility is improved. The passivator provided by the invention can better meet the urgent demand of heavy metal pollution soil restoration in China currently on strong stability, no secondary pollution, and durable and stable effect.

Description

technical field [0001] The invention belongs to the technical field of remediation of heavy metal polluted soil, and in particular relates to a soil heavy metal passivator, a preparation method and a passivation method for soil cadmium. Background technique [0002] With the rapid development of industry and agriculture and the continuous acceleration of urban processes, the discharge of heavy metals from industry, agriculture and daily life is increasing, and soil pollution by heavy metals is also becoming more and more serious. Soil is an important part of the ecological environment system and the material basis for human survival and development. The migration and transformation of heavy metals in soil not only endanger the growth of crops, but also endanger the health of animals and humans. According to the statistics of the Ministry of Agriculture of my country, the land polluted by heavy metals, especially Cd, in my country accounts for about 1 / 5 of the total cultivat...

Claims

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Application Information

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IPC IPC(8): C09K17/40B09C1/08
CPCB09C1/08C09K17/40
Inventor 宋华
Owner SICHUAN SHILIWANG AGRI SCI & TECH DEV CO LTD
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