Potassium-type farmland passivation agent based on raw materials of molybdenum ore tailings and preparation method and application of passivation agent

The technology of passivating agent and tailing sand is applied in the field of farmland passivating agent, which can solve the problems of environmental pollution risk, occupation of land, waste of resources, etc., and achieve the effects of simple preparation process, strong applicability and quality improvement.

Active Publication Date: 2017-06-09
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, tailings resources are continuously accumulating every year, and a large amount of tailings sand is accumulated in the tailings pond, which not only occupies land, wastes resources, but also poses environmental risks of pollution

Method used

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  • Potassium-type farmland passivation agent based on raw materials of molybdenum ore tailings and preparation method and application of passivation agent
  • Potassium-type farmland passivation agent based on raw materials of molybdenum ore tailings and preparation method and application of passivation agent
  • Potassium-type farmland passivation agent based on raw materials of molybdenum ore tailings and preparation method and application of passivation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The preparation steps of passivating agent are as follows:

[0045] (1) Take 15g of molybdenum ore tailings and grind through a 200 mesh sieve, add 30mL, 1mol / L H 2 SO 4 Vibrate in a shaker, filter and separate, dry, and then divide into crucibles, add an equal mass of NaOH to each crucible, heat it in a muffle furnace at 823K for 3 hours, take it out to cool naturally, and grind it for use.

[0046] (2) Take 5g of the product that is ground for use in step (1) and add 90mL of water to dissolve it, centrifugally filter the supernatant, transfer it to a teflon tank, add 5.4g of sodium metaaluminate, 15.75g of water glass, and dissolve it at 343K Stir for 1h;

[0047] (3) Transfer the stirred product in the teflon tank to the reactor, react at 373K for 15 hours, then cool the resulting reaction product to room temperature, filter, wash, and dry, and the obtained powder solid is the farmland passivation agent.

[0048]The prepared farmland passivation agent was used for...

Embodiment 2

[0056] The preparation steps of passivating agent are as follows:

[0057] (1) Take 15g of molybdenum ore tailings and grind through a 200 mesh sieve, add 30mL, 1mol / L H 2 SO 4 Vibrate in a shaker, filter and separate, dry, and then divide into crucibles, add NaOH to each crucible, heat in a muffle furnace at 873K for 2 hours, take it out to cool naturally, grind it for use, and add NaOH to each crucible The quality of NaOH is that the mass ratio of molybdenum ore tailings to NaOH after drying is 0.85.

[0058] (2) Get 5g of the product that is ground for use in step (1) and add 90mL of water to dissolve it, and get the supernatant by centrifugal filtration, transfer it to a teflon tank, add 5.4g of sodium metaaluminate, 15.75g of water glass, and dissolve it at 333K Stir for 3h;

[0059] (3) Transfer the stirred product in the teflon tank to the reactor, react at 373K for 12 hours, then cool the resulting reaction product to room temperature, filter, wash, and dry, and the...

Embodiment 3

[0068] The preparation steps of passivating agent are as follows:

[0069] (1) Take 15g of molybdenum ore tailings and grind through a 200 mesh sieve, add 30mL, 1mol / L H 2 SO 4 Vibrate in a shaker, filter and separate, dry, and then divide into crucibles, add an equal mass of NaOH to each crucible, heat it in a muffle furnace at 823K for 3 hours, take it out to cool naturally, and grind it for use.

[0070] (2) Get 5g of the product that is ground for use in step (1) and add 90mL of water to dissolve it, and get the supernatant by centrifugal filtration, transfer it to a teflon tank, add 5.4g of sodium metaaluminate, 15.75g of water glass, and dissolve it at 343K Stir for 2h;

[0071] (3) Transfer the stirred product in the teflon tank to the reactor, react at 403K for 8 hours, then cool the obtained reaction product to room temperature, filter, wash, and dry, and the obtained powder solid is the farmland passivation agent.

[0072] The prepared farmland passivation agent w...

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Abstract

The invention belongs to the technical field of environmental-heavy-metal pollution treatment and discloses a potassium-type farmland passivation agent based on raw materials of molybdenum ore tailings and a preparation method and application of the passivation agent. The method includes: subjecting the molybdenum ore tailings to acid pickling prior to adding an alkaline potassium compound; performing common heating in a muffle and then dissolution by adding water; taking a supernate prior to regulating material ratio by adding sodium metaaluminate and water glass; performing reaction in a reactor to obtain the farmland passivation agent after passivation of reaction products after the reaction is completed. The farmland passivation agent is quite good in passivation effect, and CaCl2 extraction-state heavy metal content can be reduced by more than 95%; the prepared farmland passivation agent is produced under the alkaline environment, the pH value of acid soil is increased by at least 2 units during passivation of heavy metal, soil acidification is improved, and the farmland passivation agent can be applied to the field of farmland repairing; waste of the raw materials of the molybdenum ore tailings is fully utilized, quality of the product is improved, and meanwhile, the purpose of dealing with waste by waste is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental heavy metal pollution treatment, and in particular relates to a farmland passivator based on molybdenum ore tailings as a raw material, its preparation method and application. Background technique [0002] With the emergence of events such as "cadmium rice", "poisonous land" and "cancer village", people are increasingly concerned about soil environmental pollution. In our country, the problem of soil pollution has reached a point that cannot be ignored. "National Soil Pollution Survey Bulletin", the survey results show that the total soil point exceeding standard rate in the country is 16.1%, and the cultivated soil point point exceeding standard rate is 19.4%. The pollution type is mainly inorganic type, followed by organic type. The proportion of complex pollution is small, and the number of points exceeding the standard of inorganic pollutants accounts for 82.8% of the total points of ex...

Claims

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Application Information

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IPC IPC(8): C09K17/04B09C1/08C09K101/00C09K109/00
CPCB09C1/08C09K17/04C09K2101/00C09K2109/00
Inventor 李永涛王进进胡峥张玉龙任宗玲
Owner SOUTH CHINA AGRI UNIV
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