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Mineral soil conditioner produced by utilizing fly ash and preparation method thereof

A technology of soil conditioner and fly ash, which is applied in the field of agricultural resource utilization of fly ash, can solve the problems of insufficiently advanced technology and low efficiency of resource utilization, so as to improve the quality of soil environment and improve the level of high-efficiency comprehensive utilization , The effect of reducing the amount of farmland

Pending Publication Date: 2019-11-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to propose in view of the low utilization efficiency of the existing fly ash resources and the insufficiently advanced technical level. The present invention provides a mineral soil conditioner produced by using fly ash and a preparation method thereof. The method It is summarized as follows: by adding various heteroacid solvents to the fly ash to dissolve the heavy metal elements in the fly ash, and then using sodium sulfide solution to precipitate the acid-soluble heavy metal ions, so that the acidic heteroacid solvent can be reused

Method used

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  • Mineral soil conditioner produced by utilizing fly ash and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A thermal power plant in Inner Mongolia has an annual output of 1 million tons of fly ash, of which the silica content is 57.67wt%, potassium oxide content is 0.42wt%, alumina content is as high as 17.32wt%, calcium oxide content is 2.15wt%, iron oxide content 1.35wt%, of which the heavy metal content is: lead content 121.73mg / kg, cadmium content 2.15mg / kg, mercury content 0.74mg / kg, copper content 7.97 mg / kg.

[0035] Its operation process is:

[0036] (1) After mixing fly ash with humic acid, hydrochloric acid, sulfuric acid, nitric acid, and perchloric acid at a solid / liquid ratio of 1:1 g / mL, ultrasonically for 20 minutes , stirred at 85r / min stirrer speed for 55 minutes to make it fully mixed, and then filtered to obtain the removal rates of heavy metals in fly ash as follows: lead 67%, cadmium 86%, mercury 66%, copper 87% ;

[0037] (2) Add sodium sulfide solution with a concentration of 0.15 mol / L to the filtrate obtained after filtering in step (1), and the pH...

Embodiment 2

[0041] A thermal power plant in Liaoning has an annual output of 1.6 million tons of fly ash, of which the silica content is 52.67wt%, the alumina content is 21.76wt%, the potassium oxide content is 0.72wt%, the calcium oxide content is 3.15wt%, and the iron oxide content is 3.57wt%, of which the heavy metal content is: lead content 101.30mg / kg, cadmium content 1.71mg / kg, mercury content 0.78 mg / kg, copper content 19.48 mg / kg.

[0042] Its operation process is:

[0043] (1) Mix the fly ash with the mixed acid solution of humic acid, hydrochloric acid, sulfuric acid, hydrofluoric acid, nitric acid and perchloric acid with a concentration of 0.57mol / L at a solid / liquid ratio of 1:2.5g / mL Finally, after 15 minutes under the action of ultrasonic waves, stir for 60 minutes under the stirring speed of 150r / min to make it fully mixed, and then filter to obtain the removal rates of heavy metals in fly ash as follows: lead 78%, cadmium 82 %, Mercury 49%, Copper 70%;

[0044] (2) Add ...

Embodiment 3

[0048] A thermal power plant in Hebei Province has an annual output of 3 million tons of fly ash, of which the silica content is 46.67wt%, the alumina content is 15 wt%, the potassium oxide content is 0.92wt%, the calcium oxide content is 6.15wt%, and the iron oxide content The content of heavy metals is 2.71wt%, of which the content of heavy metals is: lead content 71.73mg / kg, cadmium content 1.13mg / kg, mercury content 1.07 mg / kg, copper content 38.02 mg / kg.

[0049] Its operation process is:

[0050] (1) After mixing the fly ash with the mixed acid solution of humic acid, hydrochloric acid, sulfuric acid, hydrofluoric acid, acid and perchloric acid with a concentration of 0.9mol / L at a solid / liquid ratio of 1:5 g / mL , after ultrasonication for 27 minutes, stirred at 195r / min stirrer speed for 115 minutes to make it fully mixed, and then filtered to obtain the removal rates of heavy metals in fly ash as follows: lead 72%, cadmium 73%, mercury 73% %, copper 79%;

[0051] (2)...

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Abstract

The invention discloses a mineral soil conditioner produced by utilizing fly ash and a preparation method thereof. The preparation method comprises the following steps: (1) mixing fly ash with heteroacid, and stirring and filtering the mixture under the ultrasonic action to obtain finely selected fly ash and filtrate; (2) fully mixing the finely selected fly ash filtered in the step (1) with a calcium-based compound and a potassium-based compound, granulating the mixture, and drying a product with tail gas waste heat of a kiln; and (3) after granulation and drying in the step (2), continuouslyroasting and activating the product in the kiln, and performing cooling, ball-milling and forming to obtain the mineral soil conditioner. According to the mineral soil conditioner, agricultural efficient utilization of a coal-fired by-product that is the fly ash is realized, and the content of heavy metals in the fly ash and environmental poison caused by the heavy metals are reduced; the prepared mineral soil conditioner is complete in mineral nutrients, and the purpose of balanced fertilization is achieved.

Description

technical field [0001] The invention relates to the technical field of agricultural resource utilization of fly ash, in particular to a mineral soil conditioner produced by using fly ash and a preparation method thereof. Background technique [0002] my country is a large coal-producing country. Coal accounts for more than 2 / 3 of the country's total energy, and more than 3 billion tons of coal are burned each year. Calculated as 4 tons of coal to produce 1 ton of fly ash, the total amount of fly ash produced each year As high as more than 120 million tons, it has become the largest single pollution source of industrial solid waste in my country. Because fly ash is enriched in a large amount of heavy metal substances such as arsenic, lead, cadmium, chromium and mercury that are harmful to human health, it has caused great harm to the environment, and the low effective nutrient limits its comprehensive utilization in agriculture. efficiency. The pollution caused by fly ash is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08A01B79/02C05G3/04C09K101/00C09K109/00
CPCC09K17/40B09C1/08A01B79/02C05D1/00C05D1/02C09K2101/00C09K2109/00Y02P20/129C05D1/005C05G3/80C05D3/00C05D5/00C05D9/02C09K17/04
Inventor 石林
Owner SOUTH CHINA UNIV OF TECH
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