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Soil conditioner for repairing cadmium-arsenic compound polluted farmland and preparation method thereof

A soil conditioner and compound pollution technology, applied in the field of farmland soil remediation, can solve problems such as excessive cadmium and arsenic, and achieve the effects of simple production method, favorable industrial production and low cost

Inactive Publication Date: 2019-08-06
格丰科技材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Another object of the present invention is to provide a method for preparing a soil conditioner for repairing cadmium-arsenic compound-contaminated farmland. The raw material is simple, easy to prepare, low in cost, and the effect of improving soil pollution is remarkable. The problem of excessive cadmium and arsenic in medium

Method used

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  • Soil conditioner for repairing cadmium-arsenic compound polluted farmland and preparation method thereof
  • Soil conditioner for repairing cadmium-arsenic compound polluted farmland and preparation method thereof
  • Soil conditioner for repairing cadmium-arsenic compound polluted farmland and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0045] A soil conditioner for repairing cadmium-arsenic composite polluted farmland, comprising the following raw materials in parts by weight:

[0046] 40 parts of calcium carbonate, 20 parts of magnesium oxide, 10 parts of gypsum powder, 10 parts of humic acid, 10 parts of hydroxy iron pillared attapulgite, 10 parts of sodium silicate.

[0047] The preparation method of described hydroxyl iron pillared attapulgite is:

[0048] 1): According to the molar ratio NaOH / FeCl 2 =2.1:1, slowly inject 0.5mol / L NaOH solution into 0.5mol / L FeCl with constant aeration and stirring 2 Then, add water to adjust the pH value of the solution to 6.5, the color to deep red, and then leave it at room temperature for 24 hours to obtain the hydroxyl iron pillar solution.

[0049] 2): Attapulgite and water are mixed and ball-milled at a volume ratio of 1:2 to prepare an attapulgite slurry, and the prepared hydroxyl iron pillar liquid is slowly added to the attapulgite slurry to control the iron ...

Embodiment 2

[0052] A soil conditioner for repairing cadmium-arsenic composite polluted farmland, comprising the following raw materials in parts by weight:

[0053] 40 parts of gypsum powder, 20 parts of magnesium oxide, 10 parts of shell powder, 15 parts of sodium silicate, 10 parts of humic acid, 15 parts of hydroxy iron pillared attapulgite;

[0054] The preparation method of described hydroxyl iron pillared attapulgite is:

[0055] 1): According to molar ratio Ca(OH) 2 / FeCl 2 =0.7:1, the Ca(OH) of 0.02mol / L 2 The solution is slowly injected into 0.3mol / L FeCl in an aerated state 2 Then, add water to adjust the pH value of the solution to 8.6, the color to deep red, and then leave it at room temperature for 24 hours to obtain the hydroxy iron pillar solution.

[0056] 2): Attapulgite and water are mixed and ball-milled at a volume ratio of 1:2 to prepare attapulgite slurry, and the prepared hydroxyl iron pillar liquid is slowly added to the stirred attapulgite slurry with a perist...

Embodiment 3

[0059] A soil conditioner for repairing cadmium-arsenic composite polluted farmland, comprising the following raw materials in parts by weight:

[0060] Calcium carbonate 40 parts, magnesium oxide 25 parts, disiloxane 15 parts, humic acid 10 parts, hydroxy iron pillared attapulgite 10 parts.

[0061] The preparation method of described hydroxyl iron pillared attapulgite is:

[0062] 1): According to molar ratio Ca(OH) 2 / FeSO 4 =0.55:1, the Ca(OH) of 0.02mol / L 2 The solution is slowly injected into 1.0mol / L FeSO with continuous aeration and stirring 4 Then, add water to adjust the pH value of the solution to 6.5, the color to deep red, and then leave it at room temperature for 24 hours to obtain the hydroxyl iron pillar solution. (Because calcium sulfate is generated in the process, calcium sulfate is slightly soluble and wraps calcium hydroxide, preventing the reaction from proceeding further, so it has an impact on pH).

[0063] 2): Attapulgite and water are mixed and b...

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Abstract

The invention provides a soil conditioner for repairing a cadmium-arsenic compound polluted farmland and a preparation method thereof, and the soil conditioner comprises the following raw materials inparts by weight: 40-50 parts of a calcium fertilizer, 20-30 parts of a magnesium fertilizer, 10-20 parts of a silicon fertilizer, 5-10 parts of humic acid and 5-20 parts of hydroxyl iron pillared attapulgite. Compared with the prior art, the soil conditioner for repairing the cadmium-arsenic compound polluted farmland provided by the invention can effectively inhibit the migration of cadmium andarsenic in farmland soil at the same time, and passivation of the cadmium and the arsenic based on both the farmland soil and crops can be performed. Moreover, the raw materials are mostly composed ofnatural minerals, the cost is low, the materials are simple and convenient, and the industrial production is facilitated. The produced soil conditioner contains the calcium, magnesium, silicon fertilizers and the like, effectively activates and supplements nutrient elements such as calcium, phosphorus, potassium and the like fixed by acidification of the soil, and can achieve the effect of balanced fertilization in use. The production method of the soil conditioner is simple and feasible, and has wide popularization prospect.

Description

technical field [0001] The invention belongs to the technical field of farmland soil remediation, solves the problem that cadmium and arsenic in crops exceed the standard due to cadmium and arsenic compound pollution in farmland soil, and is a soil conditioner that can effectively inhibit the migration of heavy metal cadmium and arsenic in farmland soil. It specifically relates to a soil conditioner for repairing cadmium-arsenic composite polluted farmland and a preparation method thereof Background technique [0002] In recent years, with the rapid development of my country's economy, the in-depth advancement of industrialization, urbanization and agricultural modernization, the problem of soil heavy metal pollution has become increasingly serious. [0003] Among heavy metal compound pollution, cadmium and arsenic compound pollution is the most serious form of heavy metal pollution. Cadmium and arsenic have strong biomobility and toxicity in soil, and are easily absorbed a...

Claims

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Application Information

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IPC IPC(8): C05G3/04C01B33/40C09K17/40C09K101/00C05G3/80
CPCC09K17/40C05D3/00C05D3/02C01B33/40C09K2101/00C05G3/80
Inventor 邱根萍王焕刘小年奉向东龚梅玲吴黄河章文贵朱慧可
Owner 格丰科技材料有限公司
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