Preparation method of special curing agent for recycling of dredged silt

A technology for dredging and recycling sludge, applied in the field of preparation of special curing agent for dredging sludge recycling, can solve the problems of inability to effectively fill internal pores of sludge, poor water stability and durability, low curing strength, etc. The effect of improving the pore filling rate and enhancing the bond strength

Inactive Publication Date: 2017-05-17
周益铭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem mainly solved by the present invention is: the curing agent used in traditional sludge solidification cannot effectively fill the internal pores of the sludge for the sludge with high water content and organic matter content, resulting in low strength after curing, poor water stability and durability The problem is to provide a method of using calcined diatomite and rice husk powder as the skeleton, grafting acrylic acid-acrylamide polymer, and mixing with ordinary Portland cement to prepare a special curing agent for dredging sludge recycling
The present invention uses calcined diatomite and rice husk powder with a porous structure as the skeleton, utilizes the strong water absorption of the grafted acrylic acid-acrylamide polymer to absorb the moisture in the sludge, and firmly adsorbs the sludge particles around the skeleton structure. The curing effect of cement can fill the internal pores of light soil, effectively solving the problem of low curing strength after the use of traditional sludge curing agents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018]Weigh 400g of diatomaceous earth and 300g of rice husk in sequence, place them in an oven, and dry them at a temperature of 105°C until they reach a constant weight, then transfer the materials in the oven to a ball mill, and add oxidation Zirconium ball milling beads, ball milling and mixing for 45 minutes, passed through a 120 mesh sieve to obtain a mixed powder, and transferred the obtained mixed powder into a muffle furnace, and calcined for 20 minutes at a temperature of 450°C, cooled to room temperature with the furnace, and discharged. Calcined mixed powder was obtained; 300 g of the above-mentioned calcined mixed powder was sequentially added into a three-necked flask, 600 mL of hydrochloric acid with a concentration of 0.1 mol / L, and then the three-necked flask was placed in a digital speed measuring constant temperature magnetic stirrer at a temperature of 80 ° C and a rotating speed of Under the condition of 600r / min, stir and react at constant temperature for ...

example 2

[0021] Weigh 450g of diatomaceous earth and 350g of rice husk in turn, place them in an oven, and dry them at a temperature of 108°C until they reach a constant weight, then transfer the materials in the oven to a ball mill, and add oxidation Zirconium ball milling beads, after ball milling and mixing for 50 minutes, passed through a 180 mesh sieve to obtain a mixed powder, and transferred the obtained mixed powder into a muffle furnace, and calcined for 30 minutes at a temperature of 480°C, cooled to room temperature with the furnace, and discharged, Calcined mixed powder was obtained; 350 g of the above-mentioned calcined mixed powder was sequentially added into a three-necked flask, 700 mL of hydrochloric acid with a concentration of 0.1 mol / L, and then the three-necked flask was placed in a digital speed measuring constant temperature magnetic stirrer at a temperature of 85 ° C and a rotating speed of Under the condition of 700r / min, stir and react at constant temperature f...

example 3

[0024] Weigh 500g of diatomaceous earth and 400g of rice husk in sequence, place them in an oven, and dry them at a temperature of 110°C until they reach a constant weight, then transfer the materials in the oven to a ball mill, and add oxidation Zirconium ball milling beads, ball milling and mixing for 60 minutes, passing through a 200-mesh sieve to obtain a mixed powder, and transferring the obtained mixed powder to a muffle furnace, calcining at a temperature of 500°C for 40 minutes, cooling to room temperature with the furnace, and discharging. Calcined mixed powder was obtained; 400g of the above-mentioned calcined mixed powder was sequentially added into a three-necked flask, 800mL of hydrochloric acid with a concentration of 0.2mol / L, and then the three-necked flask was placed in a digital speed measuring constant temperature magnetic stirrer at a temperature of 90°C and a rotating speed of Under the condition of 800r / min, stir and react at constant temperature for 5h. A...

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Abstract

The invention discloses a preparation method of a special curing agent for recycling of dredged silt and belongs to the technical field of preparation of curing agents. According to the preparation method, diatomaceous earth and rice bran are dried, mixed and subjected to ball milling, then the mixture is calcined and pickled with hydrochloric acid, impurities in the diatomaceous earth and rice bran are removed, calcined powder is modified with a silane coupling agent and grafted with an acrylic acid-acrylamide polymer, a product is mixed with ordinary Portland cement after being dried, and the special curing agent for recycling of dredged silt is obtained. According to the preparation method, the calcined diatomaceous earth and rice bran powder is taken as a framework, water in the silt is absorbed by use of high water absorption of the grafted acrylic acid-acrylamide polymer, silt particles are firmly adsorbed on the periphery of the framework structure to fill pores in light soil in cooperation with the curing function of cement, and the problem that the curing strength is lower after a conventional silt curing agent is used is effectively solved.

Description

technical field [0001] The invention discloses a preparation method of a special curing agent for recycling dredged silt, and belongs to the technical field of curing agent preparation. Background technique [0002] my country has a vast territory and a wide contact line with the coast. At the same time, inland rivers and lakes are scattered all over the country. Every year, large-scale port dredging and inland route dredging projects are carried out, resulting in a large amount of dredged silt. In order to effectively treat and utilize dredged silt, many developed countries have carried out comprehensive development and utilization of dredged silt commercially. There are many ways to recycle dredged silt, and making it into mixed light soil is one of the important methods of reusing dredged silt, that is, to use dredged silt as raw material, add a certain amount of light material and curing agent, and develop a lightweight The mixed soil has achieved the purpose of turning...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B20/02
CPCC04B28/04C04B20/023C04B2111/00767C04B2201/20C04B2201/50C04B14/06C04B14/08C04B18/08C04B22/143C04B18/0418
Inventor 周益铭许丽君
Owner 周益铭
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