A kind of aluminum base gel curing agent, preparation method and application thereof

Abstract

The invention discloses an aluminum-based gelling curing agent. The mass ratio of calcium aluminate:sulfoaluminum cement:early-strength coagulant aid is (1-3):(6.5-8.5):0.5. The invention also discloses a preparation method of the above-mentioned aluminum-based gelling and curing agent: grinding calcium aluminate, sulfur-aluminum cement and early-strength coagulant with a mass ratio of (1-3):(6.5-8.5):0.5 , sieved, mixed and piled into a conical shape, and then flattened, and the surrounding samples were piled up towards the center to form a cone again and then flattened, and this was repeated several times to obtain an aluminum-based gelling curing agent. The invention also discloses a method of using the above-mentioned aluminum-based gelling and solidifying agent to dispose of the dredged bottom mud: separate the garbage sand from the slurry of the dredged bottom mud, then add cationic polyacrylamide to concentrate and dehydrate the dredged bottom mud, add The aluminum-based gelling and curing agent is mixed and stirred, and the water reducing agent is added at the same time, stirred and mixed evenly, and stabilized and cured after dehydration and curing. The invention has higher 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...

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

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