Silt curing agent prepared from caustic sludge

A curing agent and alkali residue technology, which is applied in solid waste management, dehydration/drying/thickened sludge treatment, sustainable waste treatment, etc., can solve the problems of poor treatment effect, high treatment cost and low sludge strength, and achieve The effect of protecting the marine ecological environment, good durability, and optimizing the industrial structure

Active Publication Date: 2016-06-01
宁波高新区围海工程技术开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the existing curing agent has a certain remarkable effect on the curing of soft soil with low moisture content, but for the treatment of marine silt with high moisture content, the treatment effect is not good, not only the treatment cost is high, the process is complicated, but also after curing The silt has low strength and poor durability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A sludge solidifying agent using alkali slag, its components and the mass fraction ratio of each component are: 30% alkali slag, 40% microsilica fume, 10% lime powder, 15% gypsum, 4% Sodium sulfate, 0.05% triethanolamine, 0.8% alkaline activator and 0.15% phosphate, the alkaline activator described in this embodiment is calcium hydroxide, and the described phosphate is sodium pyrophosphate. Fully mix the curing agent with the above ratio with a mixer. The compressive strength of the curing agent is 9.8MPa at 3 days and 31.8MPa at 28 days; the flexural strength at 3 days is 2.2MPa and the flexural strength at 28 days is 5.5MPa ; The initial setting time is 80min, and the final setting time is 170min.

[0017] The silt solidifying agent using alkali slag can solidify the marine tidal flat silt. Specifically, after fully mixing the above proportioned solidifying agent, blend 8% of the solidifying agent into the silt with a moisture content of 60%. and stir well. After de...

Embodiment 2

[0019] A sludge solidifying agent using alkali slag, its components and the mass fraction ratio of each component are: 40% alkali slag, 27% microsilica, 20% lime powder, 10% gypsum, 2% Sodium sulfate, 0.05% triethanolamine, 0.1% alkaline activator and 0.2% phosphate, the alkaline activator described in this embodiment is sodium silicate, and the described phosphate is sodium hexametaphosphate. Fully mix the curing agent with the above ratio with a mixer. The compressive strength of the curing agent is 9.4MPa in 3 days and 30.2MPa in 28 days; the flexural strength in 3 days is 2.0MPa and the flexural strength in 28 days is 5.4MPa ; Initial setting time 85min, final setting time 175min.

[0020] The silt solidifying agent using alkali slag can solidify the marine tidal flat silt. Specifically, after fully mixing the above proportioned solidifying agent, blend 8% of the solidifying agent into the silt with a moisture content of 60%. and stir well. After described silt is solidi...

Embodiment 3

[0022] A sludge solidifying agent using alkali slag, its components and the mass fraction ratio of each component are: 50% alkali slag, 20% microsilica fume, 15.4% lime powder, 10% gypsum, 4% Sodium sulfate, 0.01% triethanolamine, 0.57% alkaline activator and 0.02% phosphate, the alkaline activator described in this embodiment is sodium silicate, and the described phosphate is sodium hexametaphosphate.

[0023] A sludge solidifying agent using alkali slag, its components and the weight ratio of each component are: 50% alkali slag, 20% microsilica, 15.4% lime powder, 10% gypsum, 4% sulfuric acid Sodium, 0.01% triethanolamine, 0.57% sodium bicarbonate and 0.02% sodium tripolyphosphate. Fully mix the curing agent with the above ratio with a mixer. The 3-day compressive strength of the curing agent is 9.6MPa, and the 28-day compressive strength is 30.9MPa; the 3-day flexural strength is 2.1MPa, and the 28-day flexural strength is 5.2MPa ; The initial setting time is 95min, and th...

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Abstract

The invention provides a slit curing agent prepared from caustic sludge. The slit curing agent is prepared from the following components in percentage by mass: 30 percent to 50 percent of the caustic sludge, 20 percent to 40 percent of micro-silica, 10 percent to 20 percent of lime powder, 10 percent to 15 percent of plaster, 2 percent to 4 percent of sodium sulfate, 0.01 percent to 0.05 percent of triethanolamine, 0.1 percent to 0.8 percent of alkali-activator and 0.02 percent to 0.2 percent of phosphate. The slit curing agent prepared from the caustic sludge provided by the invention has the advantages that the caustic sludge is taken as a curing agent raw material; the curing agent is low in cost, and is suitable for reinforcing soft soil; the cured slit has the features of high strength, good water stability, good durability and high compressive strength; the reasonable utilization of natural slit and industrial waste materials can be realized.

Description

technical field [0001] The invention relates to a curing agent, in particular to a sludge curing agent using alkali residue. Background technique [0002] At present, China's total production capacity of soda ash has exceeded 30 million tons, making it the world's largest producer of soda ash. Every ton of soda ash produced requires 0.3 to 0.5 tons of soda slag. At present, no scientific treatment method has been found to rationalize the alkali slag. Instead, a large amount of alkali slag is surrounded by damming in tidal flats. This treatment method continues to erode tidal flat resources and seriously endanger the marine environment. With the sharp increase in demand, the sand and stone materials required for the backfill area of ​​the reclamation project are in short supply, and the abundant marine tidal mud can be used as backfill material to solve the shortage of construction land material resources. Therefore, it is urgent to develop a method of using alkali residue to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C02F11/14C04B14/06C04B18/04C04B22/06C04B22/08C04B22/10C04B22/14C04B22/16C04B24/12
CPCY02W30/91C04B28/04C02F11/14C04B2111/00767
Inventor 陈富强俞元洪郑敬云余朝伟杨娜郑恩喜干焕军张威周龙王参苏梦旭姜欢悦
Owner 宁波高新区围海工程技术开发有限公司
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