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In-situ passivation repairing agent of cadmium-arsenic combined pollution farmland soil, preparation method and application

A technology of compound pollution and remediation agents, which is applied in the field of remediation of heavy metal pollution in farmland soil, to achieve the effect of improving nutrient status, simple modification and treatment methods, and reducing risks

Inactive Publication Date: 2019-02-22
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are few relevant literatures and patents on simultaneous passivation and restoration of cadmium and arsenic in farmland soil

Method used

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  • In-situ passivation repairing agent of cadmium-arsenic combined pollution farmland soil, preparation method and application
  • In-situ passivation repairing agent of cadmium-arsenic combined pollution farmland soil, preparation method and application
  • In-situ passivation repairing agent of cadmium-arsenic combined pollution farmland soil, preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Phosphate rock powder P used in the embodiment 2 o 5 % is 25%, the main composition of steel slag: CaO is 42.4%, SiO 2 33%, Al 2 o 3 12%, MgO 5.86%, Fe 2 o 3 0.57% for MnO, 0.39% for MnO, and 5.78% for others.

[0023] Grind the phosphate rock powder and steel slag separately, and pass through 400 mesh, and measure the particle size D of the phosphate rock powder 50 17.23μm, steel slag particle size D 50 It is 21.22μm, and according to powder mass: solution volume = 1:10, add 0.5mol / L oxalic acid solution. After stirring and mixing, stand at room temperature for 2 days, then dry at 60°C, and grind through a 100-mesh sieve. Mix the modified phosphate rock powder and steel slag in a mass ratio of 1:4 with a vibrating screen machine to obtain repair agent 1.

[0024] Mix the restoration agent 1 with 100g of the test soil evenly with 1% of the soil mass. Water was added every day to maintain the soil water content at 60% of the maximum water holding capacity in th...

Embodiment 2

[0027] Phosphate rock powder P used in the embodiment 2 o 5 % is 25%, the main composition of steel slag: CaO is 42.4%, SiO 2 33%, Al 2 o 3 12%, MgO 5.86%, Fe 2 o 3 0.57% for MnO, 0.39% for MnO, and 5.78% for others.

[0028] Grind the phosphate rock powder and steel slag separately, and pass through 400 mesh, and measure the particle size D of the phosphate rock powder 50 17.23μm, steel slag particle size D 50 21.22μm, and according to powder mass: solution volume = 1:10, add 0.5mol / L oxalic acid solution. After stirring and mixing, stand at room temperature for 2 days, then dry at 60°C, and grind through a 100-mesh sieve. Mix the modified phosphate rock powder and steel slag in a mass ratio of 1:2 with a vibrating screen machine to obtain repair agent 2.

[0029] Mix the restoration agent 2 with 100g of the test soil evenly with 1% of the soil mass. Water was added every day to maintain the soil water content at 60% of the maximum water holding capacity in the fiel...

Embodiment 3

[0032] Phosphate rock powder P used in the embodiment 2 o 5 % is 25%, the main composition of steel slag: CaO is 42.4%, SiO 2 33%, Al 2 o 3 12%, MgO 5.86%, Fe 2 o 3 0.57% for MnO, 0.39% for MnO, and 5.78% for others.

[0033] Grind the phosphate rock powder and steel slag separately, and pass through 400 mesh, and measure the particle size D of the phosphate rock powder 50 17.23μm, steel slag particle size D 50 21.22μm, and according to powder mass: solution volume = 1:10, add 0.5mol / L oxalic acid solution. After stirring and mixing, stand at room temperature for 2 days, then dry at 60°C, and grind through a 100-mesh sieve. Mix the modified phosphate rock powder and steel slag in a mass ratio of 1:1 with a vibrating screen machine to obtain repair agent 3.

[0034] Mix the restoration agent 3 with 100g of the test soil evenly with 1% of the soil mass. Water was added every day to maintain the soil water content at 60% of the maximum water holding capacity in the fiel...

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Abstract

The invention discloses an in-situ passivation repairing agent of cadmium-arsenic combined pollution farmland soil, a preparation method and an application, and belongs to the technical field of the farmland soil heavy metal pollution repairing. A proportion of ground phosphate rock and steel slag is 1:4-1:1. Exchangeable form Cd content can be reduced to 26.76%-29.54%, and residual form Cd content is improved to 90.52%-113.75%. Exchangeable form As content is reduced by 29.41% maximally, and residual form As content is improved by 16.82%. Raw materials of the ground phosphate rock and the steel slag of the agent are cheap and easily obtained. A modification treatment method is simple, and environment-friendly. The agent can be used as a phosphatic fertilizer and a composite mineral fertilizer in agricultural production, and is capable of improving nutrient conditions of the farmland soil while used as a repairing agent. Compared with a process of independently adding the steel slag and the ground phosphate rock, the ground phosphate rock is capable of reinforcing capacity of exchangeable form cadmium reduced by the steel slag, and the steel slag is capable of remedying a defect ofthe ground phosphate rock that passivation capability to arsenic is poor, the repairing effect is improved, and a risk of farmland crops is reduced in the greater degree.

Description

technical field [0001] The invention belongs to the technical field of farmland soil heavy metal pollution restoration, and specifically relates to an in-situ passivation restoration agent for cadmium-arsenic compound polluted farmland soil, a preparation method and an application thereof. Background technique [0002] Affected by human activities such as metal mining and smelting, sewage irrigation, and agricultural production, the problem of heavy metal pollution in farmland soil has become increasingly prominent. Cadmium and arsenic are common heavy metal pollution elements in farmland soil. According to the 2014 "National Soil Pollution Survey Bulletin", the excessive rates of cadmium and arsenic among the "five poisonous" elements accounted for 7.0% and 2.7% of the total points respectively. Soil cadmium and arsenic pollution degrades soil functions, reduces crop yields, and poses a great problem to the safety of agricultural products such as wheat and rice, which has g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/08C09K17/40A01B79/00C09K101/00
CPCA01B79/00C09K17/08C09K17/40C09K2101/00
Inventor 蔡喜运胡灿洋任杰赵宗生
Owner DALIAN UNIV OF TECH
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