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A kind of solidification method of river silt

A solidification method and sludge technology, applied in chemical instruments and methods, fixed/solidified sludge treatment, sludge treatment, etc., can solve the problems of long initial strength time of solidified materials, low processing efficiency, low material strength, etc., and achieve saving The effect of transportation cost, simple formula and low cost

Active Publication Date: 2021-02-12
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Carry out chemical solidification treatment on sludge to convert it into engineering materials, so as to achieve the resource development and utilization of sludge; the chemical solidification materials that have been studied mainly include: (1) Inorganic curing agent: this kind of curing agent mainly includes cement, quicklime , fly ash, gypsum, etc., it can undergo a series of physical and chemical reactions with the water in the sludge to generate Ca(OH) 2 , CaCO 3 , hydrated calcium silicate and other mixtures, thereby increasing the soil connection and improving the strength of the silt, but its mixing amount is large, the processing efficiency is low, the initial strength of the curing material is long, and the curing cost is high; (2) organic curing agent: This kind of curing agent is divided into liquid state and solid state, mainly including asphalt, cement, fiber, epoxy resin, etc., which can reduce the water absorption caused by soil pores and surface tension through ion exchange, chemical polymerization, etc. , and then vibrated and compacted to increase the compactness of the silt soil and form a new silt soil structure. Although the amount of organic curing agent is small and the construction is convenient, the strength of the cured material is relatively low, the curing time is long, and it has certain environmental impact. depend on

Method used

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  • A kind of solidification method of river silt
  • A kind of solidification method of river silt
  • A kind of solidification method of river silt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] Step 1, take the following raw materials respectively according to mass percentage:

[0077] 20% of cement, 35.09% of fly ash, 44.80% of quicklime, 0.01% of fast curing resin, 0.1% of sludge strengthening resin, and the sum of the mass percentages of the above components is 100%;

[0078] Wherein, the rapid curing resin is specifically prepared according to the following steps:

[0079] Step 1.1, mix cyclohexane and dispersant evenly as a solvent, the volume ratio of cyclohexane to dispersant is 6:1;

[0080] Among them, the dispersant is a mixture of Span-80 and cetyltrimethylammonium bromide, and the mass ratio of Span-80 to cetyltrimethylammonium bromide is 1:1.

[0081] Step 1.2, at a temperature lower than 40°C, mix and stir the comonomer, crosslinking agent, inorganic oxide particles and coupling agent until dissolved, and then add the whole to the solvent prepared in step 1 to obtain a mixed solution a ;

[0082] The crosslinking agent accounts for 0.09% of th...

Embodiment 2

[0109] Step 1, take the following raw materials respectively according to mass percentage:

[0110] 20% of cement, 30% of fly ash, 41% of quicklime, 1% of fast curing resin, 8% of sludge strengthening resin, and the sum of the mass percentages of the above components is 100%;

[0111] Wherein, the rapid curing resin is specifically prepared according to the following steps:

[0112] Step 1.1, mix cyclohexane and dispersant evenly as a solvent, the volume ratio of cyclohexane to dispersant is 8:1;

[0113] Among them, the dispersant is a mixture of Span-80 and cetyltrimethylammonium bromide, and the mass ratio of Span-80 to cetyltrimethylammonium bromide is 1:1.

[0114] Step 1.2, at a temperature lower than 40°C, mix and stir the comonomer, crosslinking agent, inorganic oxide particles and coupling agent until dissolved, and then add the whole to the solvent prepared in step 1 to obtain a mixed solution a ;

[0115] The crosslinking agent accounts for 1% of the total mass o...

Embodiment 3

[0143] Step 1, take the following raw materials respectively according to mass percentage:

[0144] 30% of cement, 40% of fly ash, 26% of quicklime, 0.01% of fast curing resin, 3.99% of sludge strengthening resin, and the sum of the mass percentages of the above components is 100%;

[0145] Wherein, the rapid curing resin is specifically prepared according to the following steps:

[0146] Step 1.1, mix cyclohexane and dispersant evenly as a solvent, the volume ratio of cyclohexane and dispersant is 7:1;

[0147] Among them, the dispersant is a mixture of Span-80 and cetyltrimethylammonium bromide, and the mass ratio of Span-80 to cetyltrimethylammonium bromide is 1:1.

[0148] Step 1.2, at a temperature lower than 40°C, mix and stir the comonomer, crosslinking agent, inorganic oxide particles and coupling agent until dissolved, and then add the whole to the solvent prepared in step 1 to obtain a mixed solution a ;

[0149] The crosslinking agent accounts for 0.2% of the tot...

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Abstract

A method for solidifying river silt disclosed by the invention, step 1, respectively weighing the following raw materials according to the mass ratio: 20% to 45% of cement, 20% to 50% of fly ash, 10% to 40% of quicklime, fast curing resin 0.01% to 1%, 0.1% to 8% of silt strengthening resin; step 2, pretreatment of river silt; step 3, step by step adding each raw material of the river silt curing agent weighed above to the river silt, make it mix Uniformly obtain massive solidified sludge; step 4, carry out mold pressing with massive solidified sludge, finally obtain solidified sludge module; The solidification method of river sludge of the present invention greatly shortens sludge solidification time, improves the compressive strength of sludge material after solidification, tensile strength Strength and crack resistance, seal the heavy metal ions in the sludge so that they do not come out, and completely solve the problem of sludge polluting the environment.

Description

technical field [0001] The invention belongs to the technical field of sludge solidification methods, and in particular relates to a solidification method of river sludge. Background technique [0002] In my country, a large amount of dredging silt is produced every year in the process of construction and maintenance of ports and waterways and water environment treatment of rivers and lakes. According to statistics, the annual amount of silt dredging in the Pearl River Delta reaches 8×10 7 m 3 , the comprehensive treatment of the water environment in the Taihu Lake Basin has a dredging project volume of about 35 million m 3 20 million m3 of dredged mud is produced every year for the maintenance of the deep water channel in the Yangtze Estuary 3 . Due to the poor mechanical properties of silt, it cannot be directly used for engineering, so it can only be landfilled nearby, occupying a large amount of land resources; and the current river pollution is serious. In addition ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/148C02F11/00C02F11/121
CPCC02F11/00C02F11/008C02F11/121C02F11/14C02F2303/06
Inventor 苏洁程文吕甜李沛芝岳子林贾齐星王敏
Owner XIAN UNIV OF TECH