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Aluminum base gelling and curing agent, preparation method and application thereof

A technology of solidification and aluminum-based glue, applied in the field of aluminum-based glue coagulant and preparation field, can solve the problems of large amount of dredged sediment, few ways of resource utilization of solidified sediment, and difficulty in large-scale consumption, etc. The effect of reducing ecological damage and natural resource consumption, realizing large-scale safe treatment and disposal, and enhancing mechanical strength

Inactive Publication Date: 2015-09-02
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing sediment dehydration and solidification technology can improve the mechanical strength of the sediment to a certain extent, but the common problems are that the dosage is too high (usually the moisture content is greater than 10% of the wet weight of the sediment at 90%), the volume increase ratio is large, and the sediment The pH value has a large range of influence, secondary pollution may be introduced during the disposal process, and there are few resource utilization methods for solidified sediment, etc.
However, the potential resource utilization methods of sediment include firing porous bricks and cement clinker, which generally have the disadvantages of large energy consumption, small processing scale, and difficulty in large-scale consumption of untreated sediment.
The amount of earthwork required for highway subgrade filling is huge, and the amount of earthwork required per kilometer is about 65,000 m 3 , but the excavation of fresh clay will cause soil erosion and vegetation damage, which will have extremely adverse effects on the ecological balance and the development of agriculture and forestry.
[0004] Dredged sediment has a large amount of production, high moisture content, high content of heavy metals and persistent organic pollutants, and a high risk of leaching. The existing disposal methods are mainly temporary stacking in rented yards, and the dredged sediment has not been realized. Effective resource utilization, and because the storage site has not been treated for seepage prevention, heavy metals and other pollutants in the sediment have serious environmental pollution risks to the surrounding water and soil

Method used

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  • Aluminum base gelling and curing agent, preparation method and application thereof
  • Aluminum base gelling and curing agent, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Solidification and modification treatment of river dredging sediment in a city in Jiaxing City

[0037] (1) Preparation of aluminum-based gelling and curing agent

[0038] The laboratory preparation method adopts the falling cone method: grind calcium aluminate, sulfur-aluminum cement, and early-strength coagulant with a mass ratio of 3:6.5:0.5, pass through a 0.08mm sieve, mix and accumulate into a cone, and then flatten it. The surrounding samples are piled up to the center to form a cone again and then flattened, and this is repeated several times to obtain an aluminum-based gelling curing agent;

[0039] The industrial preparation method uses a ball mill to fully grind calcium aluminate, sulfur-aluminum cement, and early-strength coagulant respectively. After passing through a 2mm sieve, the mass ratio of calcium aluminate:sulfo-aluminum cement:early-strength coagulant is 3: 6.5:0.5 directly added to the dredged sediment. Early strength coagulant is anhydrous CaSO...

Embodiment 2

[0055] Example 2—Pilot test of solidification and modification treatment of river dredged sediment in a certain city in Jiaxing City

[0056] (1) Preparation of aluminum-based gelling and curing agent

[0057] The laboratory preparation method adopts the falling cone method: grind calcium aluminate, sulfur-aluminum cement, and early-strength coagulant with a mass ratio of 1:8.5:0.5, pass through a 0.08mm sieve, mix and accumulate into a conical shape, and then flatten it. The surrounding samples are piled up to the center to form a cone again and then flattened, and this is repeated several times to obtain an aluminum-based gelling curing agent;

[0058] The industrial preparation method uses a ball mill to fully grind calcium aluminate, sulfur-aluminum cement, and early-strength coagulant respectively. After passing through a 2mm sieve, the mass ratio of calcium aluminate:sulfo-aluminum cement:early-strength coagulant is 1: 8.5:0.5 Add directly to the dredged sediment. Earl...

Embodiment 3

[0070] Example 3 - Solidification and modification treatment of dredged sediment in a certain city in Shanghai

[0071] (1) Preparation of aluminum-based gelling and curing agent

[0072] The laboratory preparation method adopts the falling cone method: grind calcium aluminate, sulfur-aluminum cement, and early-strength coagulant with a mass ratio of 2:7.5:0.5, pass through a 0.08mm sieve, mix and accumulate into a cone, and then flatten it. The surrounding samples are piled up to the center to form a cone again and then flattened, and this is repeated several times to obtain an aluminum-based gelling curing agent;

[0073] The industrial preparation method uses a ball mill to fully grind calcium aluminate, sulfur-aluminum cement, and early-strength coagulant respectively. After passing through a 2mm sieve, the mass ratio of calcium aluminate:sulfo-aluminum cement:early-strength coagulant is 2: 7.5:0.5 directly added to the dredged sediment. The early strength coagulant is c...

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Abstract

The invention discloses an aluminum base gelling and curing agent, which comprises calcium aluminate, sulfur aluminum cement and an early-strengthening coagulant aid, wherein the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5. The invention also discloses a preparation method of the above aluminum base gelling and curing agent. According to the method, the calcium aluminate, the sulfur aluminum cement and the early-strengthening coagulant aid, in the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5, are ground, sieved, mixed and stacked up in a cone shape. After that, samples are pressed flat, and peripheral samples are stacked up centrad again in a cone shape and then pressed flat. So repeatedly for several times, and then the aluminum base gelling and curing agent can be obtained. The invention also discloses a method for treating the dredged sediment by means of the above aluminum base gelling and curing agent. Waste and gravels in the mud of the dredged sediment are separated, and then the cationic-type polyacrylamide is added to thicken and dehydrate the dredged sewage. After that, the aluminum base gelling and curing agent is added and mixed with the dredged sewage, and the mixture is stirred. Meanwhile, a water reducer is added and mixed uniformly with the above mixture. After the dehydration and solidification process, the obtained product is subjected to stabilization maintenance. The aluminum base gelling and curing agent is higher in economic, social and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to an aluminum-based gelling and curing agent, a preparation method and an application thereof. Background technique [0002] The water flows received by surface water bodies include urban surface runoff, treated domestic sewage and industrial wastewater. The particulate matter and dissolved substances entrained in these water flows will settle under certain hydraulic conditions and chemical and biological effects, and transform into water sediments. During the formation of water body sediments, through a series of physical and chemical actions such as adsorption, complexation, and chemical reactions, the heavy metals entering the water body are gathered together, and when the environmental conditions at the interface between water and sediments change, they are enriched in the sediments The heavy metal pollutants will be released again and become the endogenous poll...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06
Inventor 武博然柴晓利麦婧婧邓雨晨徐怡婷许中硕陈佳豪
Owner TONGJI UNIV
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