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Dewatered sludge curing agent, preparation method and use method

A technology for dewatering sludge and solidifying agent, applied in the field of environmental engineering, can solve the problems of ecological environment balance destruction, inconsistency with the national policy of building a resource-saving society, etc., and achieve the effects of stable enhancement, strength enhancement, and enhancement rate.

Inactive Publication Date: 2021-07-23
虞克夫
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the economically developed eastern region, where sand, gravel and land resources are in short supply, this construction mode of splitting mountains and quarrying rocks and destroying land to build roads is eroding the land resources that people rely on for survival. The balance of the ecological environment and the natural environment The destruction of resources is undoubtedly a practice of killing the chicken and taking the eggs, which does not conform to the national policy of building a resource-saving society and should be subject to certain restrictions or restrictions

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The dewatered sludge solidifying agent of the present embodiment is made up of iron ore tailings, cinder, phosphogypsum, and condensate, and the composition is iron ore tailings by mass ratio: coal slag: phosphogypsum: condensate=1: 1: 1: 1 Mixing; Among them, the iron ore tailings adopt monometallic iron ore tailings, and the SiO of iron ore tailings 2 The silicon grade content is 78%, and generally does not contain associated elements; the SiO of coal slag 2 The silicon grade is 43%, and the particle size of iron ore tailings, coal cinder, phosphogypsum and conglomerate is ≤100 mesh.

[0036] Cinder also contains Al 2 o 3 29%, Fe 2 o 3 7%, CaO 3%, and a small amount of magnesium, sulfur, carbon, etc.; among them, the main component of phosphogypsum is calcium sulfate dihydrate with a content of 93%, in addition, it also contains various other impurities; among them, condensate is a curing agent; One or more industrial wastes such as slag, steel slag, fly ash, coa...

Embodiment 2

[0045] The dewatered sludge solidifying agent of the present embodiment is made up of iron ore tailings, cinder, phosphogypsum and condensate, and the composition is iron ore tailings by mass ratio: coal slag: phosphogypsum: condensate=2: 2: 1: 3 Mixing; Among them, the iron ore tailings adopt monometallic iron ore tailings, and the SiO of iron ore tailings 2 The silicon grade content is 79.2%, and generally does not contain associated elements; the SiO of coal slag 2 The silicon grade content is 40%, and the particle size of iron ore tailings, coal cinder, phosphogypsum and congealing stones are all ≤100 mesh.

[0046] Cinder also contains Al 2 o 3 32.3%, Fe 2 o 3 16%, CaO 2.2%, and a small amount of magnesium, sulfur, carbon, etc.; among them, the main component of phosphogypsum is calcium sulfate dihydrate, with a content of 92.7%, and it also contains various other impurities; among them, condensate is a curing agent; One or more industrial wastes such as slag, steel ...

Embodiment 3

[0055] The dewatered sludge solidifying agent of the present embodiment is made up of iron ore tailings, cinder, phosphogypsum and condensate, and the composition is iron ore tailings by mass ratio: coal slag: phosphogypsum: condensate=1:1:3:3 Mixing; Among them, the iron ore tailings adopt monometallic iron ore tailings, and the SiO of iron ore tailings 2 The silicon grade content is 77.1%, and generally does not contain associated elements; among them, SiO in coal slag 2 The silicon grade content is 42.4%, and the particle size of iron ore tailings, coal cinder, phosphogypsum and conglomerate are all ≤100 mesh.

[0056] Cinder also contains Al 2 o 3 31.2%, Fe 2 o 3 6.7%, CaO 2.3%, and a small amount of magnesium, sulfur, carbon, etc.; among them, the main component of phosphogypsum is calcium sulfate dihydrate with a content of 91.3%, and in addition, it also contains various other impurities; among them, condensate is a curing agent; One or more industrial wastes such ...

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Abstract

The invention relates to a dewatered sludge curing agent, a preparation method and a use method, and belongs to the technical field of environmental engineering, the dewatered sludge curing agent comprises iron ore tailings, coal cinder, phosphogypsum and coagulated stone according to the mass percentage of (1-3): (1-3): (1-3): (1-4), and the preparation method comprises the following steps: respectively washing, drying, crushing and grinding the iron ore tailings, the coal cinder and the phosphogypsum, grinding the coagulated stone, and uniformly mixing in proportion after treatment. The use method of the dewatered sludge curing agent comprises the following steps: adding dewatered sludge and the added dewatered sludge curing agent into a stirrer according to a mass ratio of 1: (0.04-0.08), uniformly stirring, and stacking for three days in a normal-temperature field, so that the compressive strength can reach 61-82.2 kPa, and the pH value of a leachate is 7.05-8.4. The dewatered sludge curing agent adopts solid wastes as raw materials, treats wastes with wastes, and is wide in raw material source and low in cost. The cured dewatered sludge is used as soil for road filling.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a dewatered sludge solidifying agent, a preparation method and a use method. Background technique [0002] Sludge is a by-product of domestic sewage and industrial sewage discharged by sewage treatment plants. Raw sewage contains sediment, fibers, animal and plant residues and organic matter, heavy metal ions, viruses, germs, and insect eggs adsorbed on them. A kind of thick substance formed by colloid and colloid, after the sewage treatment of the sewage treatment plant, the toxic and harmful substances contained in the raw sewage remain in the dewatered sludge, which needs to be stabilized, reduced and harmless deal with. [0003] In recent years, people have become increasingly clear about the environmental risks and personal hazards caused by sludge, and they are eager to stop the harm caused by sewage and sludge, turn harm into benefit, improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00
CPCC02F11/008
Inventor 虞克夫
Owner 虞克夫
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