Sludge solidifying agent prepared from slag and its preparation method and application

Abstract

The invention provides a sludge solidifying agent prepared by using slag, a preparation method and application thereof. The curing agent is prepared from the following raw materials in mass percentage: 15-25% slag, 20-25% modified diatomite, 20-25% attapulgite, 10-15% silica fume, 4-8% Powdered activated carbon, 5-10% peroxide, 1-3% potassium permanganate, 1-2.5% iron powder, 1-5% cationic chelate, 1-5% polyrotaxane, 1-5% polyacrylic acid Sodium, 0.1-0.8% alkaline activator, 0.1-0.5% water reducer, 0.1-0.3% thickener, fully mix the above raw materials in a mixer, and mix them according to the mass ratio of 5%-30% of the sludge Put it into the mud, then mix it thoroughly, let it dry and cure naturally for 0.5‑1h before use. The invention has the advantages of simple curing process, short curing time and high efficiency. During the curing process, the toxic and harmful substances in the sludge can be degraded, and the peculiar smell in the sludge can be removed. The cured sludge will not cause secondary pollution.

Description

technical field [0001] The invention relates to the field of sludge treatment, in particular to a sludge solidifying agent and its preparation method and application. Background technique [0002] Sludge is a viscous substance produced in the process of sewage treatment. It is mainly composed of aerobic and anaerobic microorganisms. It is a complex mixture of organic matter, metals, germs, insect eggs, colloids, etc. For large urban sewage treatment plants and rivers and lakes in cities, due to the large amount of industrial wastewater discharged into the system, the sewage sludge contains a large number of microorganisms, pathogens, heavy metals and organic pollutants, and the water content is generally 80%. Above, if not handled properly, it will cause serious secondary pollution. [0003] At present, the treatment methods of sewage sludge are mainly agricultural use, incineration and landfill, and there is still a large amount of sewage sludge that has not undergone any...

AI Technical Summary

Problems solved by technology

[0004] Most of the existing sludge solidification methods use cement and quicklime as the main body. The role of cement is to increase the adhesiveness of the sludge, make the sludge bond together, and harden the sludge. Quicklime is mainly used for water absorption, such as Chinese patent No. CN201210012249.5 discloses a sludge curing agent and a sludge curing method using the sludge curing agent, which relates to the field of sludge treatment. The sludge curing agent is made by the following method: the first choice will include expandable graphite, cement, fly ash , carbon black, silica fume, china clay and quicklime are mixed with seven components. This invention also has a long curing time and cannot remove the special stench of sludge.

[0005] In addition, the existing curing agent has a certain significant effect on the curing of soft soil with low moisture content, but for the treatment of marine sludge with high moisture content, the treatment effect is not good, not only the treatment cost is high, the process is complicated, Moreover, the cured sludge has low strength and poor durability

[0006] The melt produced in the process of slag pyrometallurgy floating on the surface of liquid substances such as metals is mainly composed of oxides (silicon dioxide, alumina, calcium oxide, magnesium oxide), and often contains sulfide and entrains a small amount of metal For example, producing 1 ton of pig iron produces about 0.3-1 ton of blast furnace slag, and the slag that does not return to the basic smelting process is often regarded as waste and piled up in tidal flats by damming. This unreasonable treatment method not only erodes tidal flat resources, and seriously endanger the environment

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