Silt curing agent prepared from steel slag modified phosphogypsum and use method thereof

A technology of phosphogypsum and curing agent, applied in chemical instruments and methods, fixed/solidified sludge treatment, sludge treatment, etc., can solve the problems of low curing strength and high cost of sludge curing agent

Inactive Publication Date: 2020-10-27
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems of high cost and low curing strength of the existing sludge curing agent

Method used

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  • Silt curing agent prepared from steel slag modified phosphogypsum and use method thereof
  • Silt curing agent prepared from steel slag modified phosphogypsum and use method thereof
  • Silt curing agent prepared from steel slag modified phosphogypsum and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The raw materials in the sludge solidifying agent prepared by utilizing steel slag modified phosphogypsum provided by this embodiment are composed by mass percentage: 65% of steel slag modified phosphogypsum powder, 35% of cement (27% of slag, 4% of silica fume, red mud 4%), reinforcing agent 3%; wherein, the mass ratio of phosphogypsum and steel slag in steel slag modified phosphogypsum powder is 4:1.

[0032] Get the silt solidifying agent that this embodiment formula forms and existing P · O32.5 cement mixes in the river channel silt respectively under the same conditions and mix evenly, and its mixing amount is 20% of the dry weight of river channel silt, wherein the present embodiment silt solidifies The agent is mixed with the river channel sludge by using the above method of solidifying the sludge using the sludge curing agent prepared by using steel slag modified phosphogypsum. The treated river silt was put into the cement slurry mixer, stirred evenly, put into...

Embodiment 2

[0037]The raw materials in the sludge solidifying agent prepared by utilizing steel slag modified phosphogypsum provided by this embodiment are composed by mass percentage: steel slag modified phosphogypsum powder 40%, cementing agent 65% (slag 50%, silica fume 6%, red mud 9%), reinforcing agent 6%; wherein, the mass ratio of phosphogypsum and steel slag in steel slag modified phosphogypsum powder is 3:1.

[0038] Get the silt solidifying agent that this embodiment formula forms and existing P · O32.5 cement mixes in the river channel silt respectively under the same conditions and mix evenly, and its mixing amount is 25% of the dry weight of river channel silt, wherein the present embodiment silt solidifies The agent is mixed with the river channel sludge by using the above method of solidifying the sludge using the sludge curing agent prepared by using steel slag modified phosphogypsum. The treated river silt was put into a cement slurry mixer, stirred evenly, put into a tes...

Embodiment 3

[0043] The raw materials in the sludge solidifying agent prepared by utilizing steel slag modified phosphogypsum provided in this embodiment are composed by mass percentage: steel slag modified phosphogypsum powder 70%, cementing agent 35% (slag 20%, silica fume 4%, red mud 11%), enhancer 10%. Wherein, the mass ratio of phosphogypsum and steel slag in the steel slag modified phosphogypsum powder is 3:1.

[0044] Take the sludge solidifying agent prepared in this example and add it to the sludge to be solidified according to the corresponding sequence in the method of solidifying the sludge with the sludge solidifying agent prepared by using steel slag modified phosphogypsum, and simultaneously dry the steel slag and phosphogypsum to powder respectively After the grinding process, directly mix with cementing agent and reinforcing agent simply and uniformly as the sample of the control group, and directly mix in the mud. The slurry mixer was stirred evenly and loaded into the t...

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Abstract

The invention provides a silt curing agent prepared from steel slag modified phosphogypsum and a use method thereof. The silt curing agent comprises the following components: 40-70% of steel slag modified phosphogypsum powder, 30-60% of a cementing agent and 1-10% of a reinforcing agent, wherein the steel slag modified phosphogypsum powder is formed by mixing and modifying 5-25% of steel slag and75-95% of phosphogypsum by mass percentage. According to the invention, phosphogypsum is firstly modified by steel slag, alkaline substances of the steel slag react with soluble phosphoric acid, calcium phosphate and fluoride impurities contained in the phosphogypsum to be converted into insoluble precipitate substances, the adhesion among crystals in increased, so that the bonding performance ofphosphogypsum is improved, and meanwhile, acidic substances like sulfuric acid and phosphoric acid in the phosphogypsum are mixed with the steel slag to destroy the vitreous structure in the steel slag, so that the compact silicate vitreous structure in the steel slag is dissociated, the hydration activity of the steel slag is improved, and the strength of silt cured by the curing agent is furtherimproved.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste, and in particular relates to a sludge solidifying agent prepared by using steel slag modified phosphogypsum and a use method thereof. Background technique [0002] Phosphogypsum is an industrial waste residue produced by wet process production of phosphoric acid, the main component is calcium sulfate dihydrate (CaSO 4 2H 2 O) Same as natural gypsum, because it contains impurities such as phosphoric acid and calcium phosphate, it is called phosphogypsum. According to statistics from the Phosphate and Compound Fertilizer Industry Association, the output of phosphogypsum in my country reached 78 million tons in 2018, with a comprehensive utilization rate of 39.7%. The annual increase in stockpiles exceeds 40 million tons, covering an area of ​​more than 4,000 hectares, and the historical stockpiles exceed 300 million. Tons, a large amount of phosphogypsum stoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/18C02F11/00C04B11/26
CPCC02F11/008C04B28/18C04B11/26C02F2103/007C04B18/141C04B18/146C04B18/0409C04B22/124C04B22/064C04B12/04C04B22/12C04B24/04C04B14/42C04B14/106
Inventor 熊敬超姜明明邵雁郭华军刘子豪刘颖蒋庆肯杨振
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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