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Bottom mud drying consolidation agent and preparation method thereof

A technology for a consolidating agent and bottom mud, which is applied in the field of bottom mud drying consolidating agent and its preparation, can solve the problem of high drying cost, easy drying efficiency affected by weather and environment, and bottom mud moisture content lower than 20% and other problems, to achieve the effect of reducing water content, contributing to subsequent resource utilization, and improving compression resistance

Active Publication Date: 2019-12-03
上海海顾新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, most sediments are reduced by mechanical dehydration (machine filter press), but the moisture content of the sludge after mechanical dehydration is still above 60%, which cannot meet the requirements of subsequent resource utilization technologies (such as building material utilization, road engineering utilization, etc.) ) requires that the moisture content of the bottom sludge be lower than 20%, so the bottom sludge after mechanical dehydration must be further dried before it can be used in the future
Natural drying and thermal drying are currently two types of drying technologies that are widely used, but both have certain limitations. Natural drying requires a large area of ​​drying space, and the drying efficiency is easily affected by the weather environment, and the efficiency is low. Generally speaking, the moisture content of the sediment should be reduced from 50% to 20% by natural drying, and it will take at least 10 days.
Although the thermal drying technology has high efficiency, it requires the intervention of a heat source, and the drying cost is high, so its application is limited

Method used

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  • Bottom mud drying consolidation agent and preparation method thereof
  • Bottom mud drying consolidation agent and preparation method thereof
  • Bottom mud drying consolidation agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of sediment drying consolidation agent is prepared by the following method:

[0026] A, Soak the high-calcium fly ash selected above in 2.5mol / L sodium hydroxide solution for 2 hours, then fully dry it for later use;

[0027] B, Portland cement, modified fly ash, quicklime, magnesia, soda ash, gypsum powder and microsilica are ground respectively, and passed through a 100-mesh sieve;

[0028] C. Weigh 50% of Portland cement, 20% of modified fly ash, 15% of quicklime, 8% of magnesium oxide, 2% of soda ash, 3% of gypsum powder, and 2% of microsilica powder according to mass percentage, and mix them uniformly to obtain Drying agent.

[0029] The prepared sediment drying and consolidating agent was used to dredge the sediment of a natural river in Shanghai. The initial water content of described bottom mud is about 65%, and the mass mixing ratio of drying consolidating agent is 5% (that is, consolidating agent accounts for 5% of the total mass of required dried bot...

Embodiment 2

[0035] A kind of sediment drying consolidation agent is prepared by the following method:

[0036] A. Soak the high-calcium fly ash in 1mol / L sodium hydroxide solution for 2 hours, then fully dry it for later use;

[0037] B, Portland cement, modified fly ash, quicklime, magnesia, soda ash, gypsum powder and microsilica are ground respectively, and passed through a 100-mesh sieve;

[0038] C. Take 38% of Portland cement, 30% of modified fly ash, 10.5% of quicklime, 15% of magnesium oxide, 0.5% of soda ash, 5% of gypsum powder, and 1% of microsilica powder according to mass percentage, and mix them evenly to obtain Drying agent.

[0039]The dried consolidating agent prepared in Example 2 is used for the construction mud produced in the construction process of a construction site in Shanghai, the water content of the mud is about 50%, and the mass ratio of the consolidating agent is 3% (i.e. Consolidation agent accounted for 3% of the total mass of the required dried bottom mu...

Embodiment 3

[0045] A dry curing agent is prepared by the following method:

[0046] A, Soak the high-calcium fly ash in 3mol / L sodium hydroxide solution for 2 hours, then fully dry it for later use;

[0047] B, Portland cement, modified fly ash, quicklime, magnesium oxide, soda ash, gypsum powder and microsilica powder are respectively ground until they can pass through a 100-mesh sieve;

[0048] C. Take 60% of Portland cement, 15% of modified fly ash, 15% of quicklime, 5% of magnesium oxide, 2% of soda ash, 2% of gypsum powder, and 1% of silica fume according to the mass percentage, and mix them evenly to obtain Drying agent.

[0049] The dry consolidating agent prepared in Example 3 was used to dredge the sediment of a natural river in the old urban area of ​​Suzhou. The sediment had been dehydrated by a plate and frame filter press, and the moisture content after dehydration was about 50%. The consolidating agent The mixing ratio is 5% (that is, the consolidation agent accounts for 5...

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Abstract

The invention relates to a bottom mud drying consolidation agent and a preparation method thereof, and belongs to the technical field of bottom mud drying treatment. The bottom mud drying consolidation agent is prepared by uniformly mixing 20 to 60 percent of Portland cement, 10 to 30 percent of modified coal ash, 5 to 15 percent of quick lime, 5 to 15 percent of magnesium oxide, 0.4 to 1.8 percent of sodium carbonate, 1 to 5 percent of gypsum powder and 0.5 to 2 percent of silicon micropowder. The grain size of the bottom mud drying consolidation agent is 100 meshes. The modified coal ash isobtained by performing alkali excitation on high-calcium coal ash in a sodium hydroxide solution of 1 to 3 mol / L for 2 hours. The bottom mud drying consolidation agent provided by the invention can dry the bottom mud with water content being more than 60 percent within short time (2 to 5 days) to enable the water content to be less than 20 percent, and heavy metal elements in the bottom mud can beeffectively solidified and stabilized. The bottom mud drying consolidation agent has the following advantages: the consolidation agent is wide in raw material source and small in admixture amount, sothe cost is low and large-scale promotion is benefited; furthermore, the raw material composition is beneficial for improving the quality of subsequent building material products and true bottom mudhigh-additional-value utilization is realized.

Description

technical field [0001] The invention relates to a bottom mud drying consolidation agent and a preparation method thereof, belonging to the technical field of bottom mud drying treatment. Background technique [0002] In recent years, with my country's continuous emphasis on the construction of ecological civilization and environmental protection policies, the treatment of black and odorous water bodies has become one of the most serious environmental protection issues. Dredging is an essential step in the treatment of black and odorous water bodies. The dredged sediment is usually a mixture of clay, silt, organic matter and various minerals. It is formed by depositing at the bottom of the water body after long-term physical, chemical and biological actions and water body transportation. A large number of pollutants (heavy metals) in the water body , refractory organic matter, etc.) and nutrients (nitrogen, phosphorus, etc.) will continue to accumulate in the sediment, makin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C02F11/00C02F101/20
CPCC04B28/04C02F11/008C02F2101/20C04B2111/00784C04B18/08C04B22/064C04B22/066C04B18/146C04B22/10C04B22/143
Inventor 成铭钊景镇子郦怡袁贤俊
Owner 上海海顾新材料科技有限公司
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