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A kind of potassium-type farmland passivator based on molybdenum ore tailings as raw material and its preparation method and application

A passivating agent and tailings technology, which is applied in the field of environmental heavy metal pollution treatment, can solve the problems of environmental pollution risks, waste of resources, land occupation, etc., and achieve the effects of simple preparation process, improved quality and strong applicability

Active Publication Date: 2020-04-17
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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  • A kind of potassium-type farmland passivator based on molybdenum ore tailings as raw material and its preparation method and application
  • A kind of potassium-type farmland passivator based on molybdenum ore tailings as raw material and its preparation method and application
  • A kind of potassium-type farmland passivator based on molybdenum ore tailings as raw material and its preparation method and application

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 equal mass of KOH to each crucible, heat in a muffle furnace at 823K for 3 hours, take it out to cool naturally, and grind it for use.

[0046] (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 1h;

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

[0048]The prepared potassium-type farmland passi...

Embodiment 2

[0056] The preparation steps of potassium type passivator are as follows:

[0057] (1) Take 15g of molybdenum ore tailings and grind through a 200 mesh sieve, add 90mL, 1mol / L H 2 SO 4 Vibrate in a shaker, filter and separate, dry, and then divide into crucibles, add KOH 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 KOH to each crucible The quality of KOH is that the mass ratio of molybdenum ore tailings to KOH 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 12h, 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 them 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 equal mass of KOH to each crucible, heat 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 8h, then cool the resulting reaction product to room temperature, filter, wash, and dry, and the obtained powder solid is the potassium-type farmland passivator .

[0072] The prepared potassium-type farmland ...

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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; evenly stirring for reaction to obtain the potassium-type farmland passivation agent after passivation of reaction products after 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 90%; the prepared farmland passivation agent is produced under the alkaline environment, the pH value of acid soil is increased by at least 1.8 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 potassium-type farmland passivator based on molybdenum ore tailings as a raw material and its preparation and application. Background technique [0002] In my country, the problem of soil pollution has reached a point that cannot be ignored. According to the survey results of the "National Soil Pollution Survey Bulletin", the total soil point exceeding the standard rate in the country is 16.1%, and the point point exceeding standard rate of cultivated land soil is 19.4%. Inorganic pollutants are the main pollutants, followed by organic pollutants. The proportion of composite pollutants is relatively small. Inorganic pollutants account for 82.8% of all the pollutants exceeding the standard, and most of them are heavy metal pollution. At present, soil heavy metal pollution has seriously threatened food security and is closely relat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/02C09K17/08B09C1/08C09K101/00C09K109/00
CPCB09C1/08B09C2101/00C09K17/02C09K17/08C09K2101/00C09K2109/00
Inventor 李永涛王进进胡峥张玉龙徐会娟
Owner SOUTH CHINA AGRI UNIV
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