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A kind of soft foundation material prepared by solidification of silt and its preparation method

A soft foundation and silt technology, applied in the field of soft foundation materials and its preparation, can solve the problems of low strength, long curing time, poor permeability, etc., achieve strong water absorption, improve silt characteristics, and unique dispersion effects

Active Publication Date: 2021-07-16
湖北恒沁环保科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lime, cement and other materials are often used in the prior art to solidify sludge, but the solidification effect of this type of solidifying agent depends on the particle size and water content of the soil, and the precipitation effect is poor. After solidification, the sludge often shows shortcomings such as low strength and poor permeability. As a result, it is not ideal to use it in engineering applications. Therefore, it is urgent to develop a new environmentally friendly and harmless sludge curing agent to solve the defects in the prior art.
[0003] 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. This invention also has problems such as long curing time and inability to remove the special stench of sludge.

Method used

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  • A kind of soft foundation material prepared by solidification of silt and its preparation method
  • A kind of soft foundation material prepared by solidification of silt and its preparation method

Examples

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Effect test

Embodiment 1

[0032] A method for preparing soft foundation materials by solidifying silt, the specific steps are as follows:

[0033] (1) Choose Bayer method or sintering method red mud, adjust its water content to 22%, and grind or crush it to a powder with a particle size of 200-300 mesh;

[0034] (2) aging phosphogypsum for 5 days to obtain material A; calcining material A at 250° C. for 1 hour to obtain material B, and then cooling the material B naturally; mixing the material A and material B according to 90%:10 % by weight ratio and mixed evenly, and the particle size is 200-300 mesh powder, that is, modified phosphogypsum;

[0035](3) according to the material preparation sludge curing agent of following percentage by weight: modified diatomite 26%, attapulgite 38%, magnesium oxide 14%, calcium chloride 3%, potassium permanganate 1%, sodium peroxide 7% %, cationic chelate 1%, sodium hypochlorite 2%, sodium lauryl sulfate 0.5%, polyoxyethylene-polyoxypropylene copolymer 2%, chitosan...

Embodiment 2

[0038] A method for preparing soft foundation materials by solidifying silt, the specific steps are as follows:

[0039] (1) Choose Bayer method or sintering method red mud, adjust its water content to 24%, and grind or pulverize it to a powder with a particle size of 200-300 mesh;

[0040] (2) Aging phosphogypsum for more than 7 days to obtain material A; calcining material A at 230° C. for 2.5 hours to obtain material B, and then naturally cooling the material B; the material A and material B according to 92%: 8% by weight ratio is uniformly mixed, and the particle size is 200-300 mesh powder, that is, modified phosphogypsum;

[0041] (3) according to the material preparation sludge curing agent of following percentage by weight: modified diatomite 30%, attapulgite 30%, magnesium oxide 10%, calcium chloride 4%, potassium permanganate 3%, calcium peroxide 10% %, strontium peroxide 2%, cationic chelate 2%, sodium hypochlorite 1%, isothiazolinone 0.5%, sodium lauryl sulfate 0....

Embodiment 3

[0044] A method for preparing soft foundation materials by solidifying silt, the specific steps are as follows:

[0045] (1) Choose Bayer method or sintering method red mud, adjust its water content to 25%, and grind or crush it to a powder with a particle size of 200-300 mesh;

[0046] (2) Aging phosphogypsum for more than 8 days to obtain material A; calcining material A at 210° C. for 2 hours to obtain material B, and then naturally cooling the material B; 7% by weight ratio is obtained by mixing evenly, and the particle size is 200-300 mesh powder, that is, modified phosphogypsum;

[0047] (3) according to the material preparation sludge curing agent of following percentage by weight: modified diatomite 35%, attapulgite 25%, magnesium oxide 15%, calcium chloride 4%, potassium permanganate 1%, magnesium peroxide 6 %, zinc peroxide 6%, cationic chelate 1%, sodium hypochlorite 1%, isothiazolinone 0.2%, sodium lauryl sulfate 0.1%, polyoxyethylene-polyoxypropylene copolymer 0....

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Abstract

The invention provides a soft foundation material prepared by solidifying silt and a preparation method thereof. The soft foundation material is made of the following raw materials in parts by weight: 70-80 parts of silt, 5-10 parts of silt curing agent, silicic acid Aluminum 1‑3 parts, coal gangue 2‑5 parts, slag powder 0‑3 parts, modified phosphogypsum 1‑5 parts, red mud 2‑6 parts. The present invention utilizes the sludge solidifying agent to solidify the sludge. The sludge solidifying agent has good curing effect, short curing time and high efficiency. The solidified sludge is used for road subgrade or side slope protection filling, which reduces the road construction cost and is more efficient. Conducive to protecting the environment.

Description

technical field [0001] The invention relates to the field of road materials, in particular to a soft foundation material prepared by solidifying sludge and a preparation method thereof. Background technique [0002] In order to improve the water quality of rivers and lakes, ensure the normal flood discharge capacity of rivers and the smooth flow of waterways and ports, countries around the world, including my country, are carrying out large-scale dredging and dredging projects, and the resulting huge amount of silt dredging has become a problem. Inescapable reality. Conventional technical means for sludge treatment, such as stacking and discarding, will bring many problems such as environmental pollution and land waste. If the sludge is solidified with appropriate methods or materials and used for road paving, multiple environmental and social benefits. Lime, cement and other materials are often used in the prior art to solidify sludge, but the solidification effect of this...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B24/38C04B18/04
CPCC04B28/143C04B40/0039C04B2111/0075C04B14/041C04B18/12C04B18/141C04B18/0409C04B18/0436C04B14/102C04B14/08C04B22/066C04B22/124C04B22/08C04B22/068C04B24/005C04B24/16C04B24/32C04B24/38C04B24/122C04B24/305C04B24/123C04B24/06Y02W30/91
Inventor 段恒张沁寰
Owner 湖北恒沁环保科技有限责任公司
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