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Carbon dioxide curing method

A technology of carbon dioxide and solidification method, which is applied in the field of environmental engineering, can solve the problems of encroaching on land resources, increasing the operating burden of enterprises, large construction funds and operating management costs, etc., and achieves good impurity removal effect, high activation index, and high carbon sequestration rate Effect

Pending Publication Date: 2022-08-09
呼和浩特蒙祥环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, phosphogypsum has not been well utilized as a resource. According to the current statistical data, the comprehensive utilization rate of phosphogypsum has not yet reached 15%, and the annual consumption and utilization of phosphogypsum is about 4-5 million tons; a large amount of phosphogypsum Stockpiling, to a certain extent, has caused extremely adverse effects on the environment. The stockpiling of phosphogypsum not only encroached on a large amount of land resources, but also caused air, water and soil erosion under the weather conditions of wind erosion and rain erosion. Secondary Environmental Pollution
In addition, in order to specifically store phosphogypsum, enterprises also need to build qualified slag yards in accordance with relevant national regulations, and need to invest a lot of construction funds and operating management expenses, which greatly increases the operating burden of enterprises. Therefore, the effective use of phosphogypsum is of great importance. significance

Method used

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  • Carbon dioxide curing method

Examples

Experimental program
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Effect test

Embodiment 1

[0038] A carbon dioxide solidification method, the steps are: taking modified phosphogypsum, adding ammonia water (concentration of 25wt%) and deionized water to mix, feeding 0.2L / min of carbon dioxide for carbonation treatment, and the conditions are that the temperature is 60°C and the time is 60min, The carbonation product is obtained to realize the fixation of carbon dioxide; wherein, after the modified phosphogypsum is mixed with ammonia water and deionized water, the solid-liquid ratio is 1g:2mL; the dosage ratio of ammonia water and modified phosphogypsum is n(N): n(S) = 2:1.

[0039] The preparation method of modified phosphogypsum includes: after pretreatment of the phosphogypsum, adding it to a brommethamine solution with a concentration of 1g / L (the mass-volume ratio of the phosphogypsum and the brommethamine solution is: 1g:90mL ), at a temperature of 25 °C, after fully stirring for 2 hours, filtered, washed, and dried to obtain modified phosphogypsum.

[0040] Th...

Embodiment 2

[0045]The difference between a carbon dioxide solidification method and Example 1: after the modified phosphogypsum is mixed with ammonia water and deionized water, the solid-liquid ratio is 1g:4mL; the dosage ratio of ammonia water and modified phosphogypsum is n(N):n( S) = 2.5:1.

[0046] The difference between the preparation method of modified phosphogypsum and Example 1: the mass-volume ratio of phosphogypsum and brommethamine solution is: 1g:110mL.

[0047] The difference between the pretreatment method of phosphogypsum and Example 1: the mass ratio of phosphogypsum to the total amount of coupling agent is: 1:15; the mass ratio of sulfuric acid solution to alkyl diphenyl phosphate is: 1:0.6.

Embodiment 3

[0049] The difference between a carbon dioxide curing method and Example 1: after the modified phosphogypsum is mixed with ammonia water and deionized water, the solid-liquid ratio is 1g:3mL; the dosage ratio of ammonia water and modified phosphogypsum is n(N):n( S) = 2.2:1.

[0050] The difference between the preparation method of modified phosphogypsum and Example 1: the mass-volume ratio of phosphogypsum and brommethamine solution is: 1g:95mL.

[0051] The difference between the pretreatment method of phosphogypsum and Example 1: the mass ratio of phosphogypsum to the total amount of coupling agent is: 1:13; the mass ratio of sulfuric acid solution to alkyl diphenyl phosphate is: 1:0.5.

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Abstract

The invention discloses a carbon dioxide curing method, and relates to the technical field of environmental engineering. According to the preparation method, ardealite is taken as a raw material, and carbon dioxide is fixed by adopting a wet carbonation method; in the curing process, phosphogypsum is modified through methylamine bromide, and the prepared modified phosphogypsum has a good activation index and a good carbon sequestration rate; the phosphogypsum is further pretreated, and the phosphogypsum prepared through water washing treatment, grinding-drying treatment and coupling treatment is high in impurity removal rate and higher in activation index and carbon sequestration rate.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a carbon dioxide solidification method. Background technique [0002] Phosphogypsum is a by-product discharged during the production of phosphoric acid by decomposing phosphate rock with sulfuric acid during the production of wet phosphoric acid. Its main component is CaSO. 4 ·2H 2 O, and contains a small amount of impurities such as phosphorus, fluorine, organic matter, and quartz. According to statistics, about 5.0 tons of phosphogypsum are produced for every 1 ton of phosphoric acid produced. Phosphogypsum is produced in a wide range, mainly distributed in the southwest of Yunnan, Guizhou, Sichuan and other regions, as well as in North China and Central China. For a long time, phosphogypsum has not been well utilized as a resource. According to the current statistical data, the comprehensive utilization rate of phosphogypsum has not reached 15%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/62B01D53/78
CPCB01D53/62B01D53/78B01D2257/504B01D2251/404B01D2251/61
Inventor 张雪飞
Owner 呼和浩特蒙祥环保科技有限公司
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