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Environment-friendly type mud solidification method

A solidification method and an environmentally friendly technology, applied in dewatering/drying/concentrating sludge treatment, etc., can solve the problems of environmental groundwater pollution, large footprint of tailings ponds, etc., to enhance stability, improve particle gradation and drainage The effect of improving capacity and compressive strength

Inactive Publication Date: 2015-01-14
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tailings pond covers a large area and is a great safety hazard. In addition, the water from the tailings, which is rich in mineral processing agents in the tailings pond, seeps into the ground, causing great pollution to the environment and groundwater.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Put 1.35kg of industrial waste iron tailings slag, 0.30kg of Portland cement and 0.30kg of calcium carbide slag into a mixer and stir evenly to obtain a mixture, mix the mixture with 3.0kg of silt to be solidified, stir evenly, and then let it stand for solidification.

[0028] After solidification, the 7-day unconfined compressive strength of the sludge can reach 434kPa, the 28-day unconfined compressive strength can reach 653kPa, and the 90-day unconfined compressive strength can reach 1305kPa. The corresponding CBR value is 61.1%, which is much higher than that of roadbed fill. The strength requirement that the CBR value is greater than 8% meets the strength requirement for filling soil.

Embodiment 2

[0030] Put 1.80kg of industrial waste iron tailings slag, 0.38kg of Portland cement and 0.38kg of calcium carbide slag into a mixer and stir evenly to obtain a mixture, mix the mixture with 3.0kg of silt to be solidified, stir evenly, and then let it stand to solidify.

[0031] After solidification, the 7-day unconfined compressive strength of the sludge can reach 867kPa, the 28-day unconfined compressive strength can reach 1434kPa, the 90-day unconfined compressive strength can reach 2175kPa, and the corresponding CBR value is 108.4%, which can be used as filling soil mechanical property requirements.

Embodiment 3

[0033] Put 1.80kg of industrial waste iron tailings slag, 0.25kg of Portland cement and 0.25kg of calcium carbide slag into a mixer and stir evenly to obtain a mixture, mix the mixture with 3.0kg of silt to be solidified, stir evenly, and then let it stand for solidification.

[0034]After solidification, the 7-day unconfined compressive strength of the sludge can reach 762kPa, the 28-day unconfined compressive strength can reach 1443kPa, and the 90-day unconfined compressive strength can reach 1906kPa. mechanical property requirements.

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Abstract

The invention discloses an environment-friendly type mud solidification method, comprising: uniformly mixing bone materials and a curing agent to obtain a mixture, mixing the mixture and mud to be solidified, and stewing for 1-3 days for solidification after uniformly stirring; and the bone materials are industrial waste iron tailing slag, and the curing agent is a mixture of portland cement and calcium carbide slag. Unconfined compressive strength of the solidified mud is substantially raised, through determination: the unconfined compressive strength of the solidified soil after 7 days reaches 0.40-0.98MPa, the unconfined compressive strength of the solidified soil after 28 days reaches 0.65-1.96MPa, the unconfined compressive strength of the solidified soil after 90 days reaches 1.31-3.67MPa, and a relative CBR value is 58.1-136.5%; and the solidified mud can be used as a filling material for a road, a dam or an airport runway or for engineering backfilling, and has huge economic benefit and engineering construction meanings.

Description

1. Technical field [0001] The invention relates to an environment-friendly silt solidification method, which is a solidification treatment method for silt produced in river courses, lakes, civil engineering and water conservancy projects. 2. Background technology [0002] Regarding silt, a large amount of silt with high water content will be produced in the dredging of rivers and lakes, as well as in civil engineering and water conservancy projects. These silts have high water content, high clay content, poor drainage, and extremely low strength. Many silts also contain a lot of organic matter. It is a kind of special soil that is difficult to be directly used in engineering. If it is not properly treated, it will occupy a large amount of land, and the sewage in the silt is easy to seep into the groundwater source, causing a series of social problems. [0003] There are three commonly used treatment methods for large-scale sludge: sludge disposal, heat treatment and chemical...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/14C04B28/04
Inventor 储诚富华威洪书尧漆春孙渝波
Owner HEFEI UNIV OF TECH
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