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A kind of sewage sludge environment-friendly cementitious material and preparation method thereof

A cementitious material and environment-friendly technology, applied in cement production, etc., can solve the problems of slow gelling speed, unstable curing efficiency, and unreasonable aggregate gradation of cementitious materials, and achieve uniform and fine-grained calcined particles. Facilitate mixing and molding processing, improve compressive strength and bonding performance

Active Publication Date: 2020-08-28
武汉鹏森环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the unreasonable aggregate gradation of the raw materials of the gel material, the gel material has problems such as slow gelation speed, unstable curing efficiency, and large volume expansion.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0018] As a preferred embodiment, the preparation method of a sludge environment-friendly cementitious material in the following examples and comparative examples includes the following steps: 1. drying the water-containing waste sludge and pulverizing it with a ball mill; 2. pulverizing the drying The waste mud, cement, silicon-alumina-iron-calcium oxide and coarse sand are metered into the disc ball making machine according to the weight ratio; III. 2-20% water is injected into the disc ball making machine; IV. The ball making machine rotates to make balls of various particle sizes; Ⅴ. Return the balls with excessive particle size to the ball mill, and the balls with qualified particle size enter the rotary kiln for calcination; Ⅵ. The coarse ones are milled in a ball mill, and the products with qualified particle size are discharged.

[0019] The inventors found that adjustment within the parameter range defined by the above preparation method has little effect on the effic...

Embodiment 1

[0022] An environment-friendly cementitious material for sludge and sludge, comprising the following raw materials by weight: 60% of pretreated waste sludge, 20% of coarse sand, 6% of silicon-aluminum-iron-calcium oxide, and 14% of cement; the waste sludge is sludge It is mixed with sludge in a weight ratio of 2:3; the pretreatment of the waste sludge is dehydration treatment to a water content of 4% to remove large particles and residual garbage, ball mill pulverization, and 0.075mm negative pressure screening, The sieve fineness is 30%; the silicon-aluminum-iron-calcium oxide is fly ash.

[0023] The particle size of the silicon-aluminum-iron-calcium oxide is less than or equal to 1 mm.

[0024] The particle size of the coarse sand is 0.5-1 mm.

[0025] The preparation method of the sludge environment-friendly cementitious material includes the following steps: entering the raw material into a disc type ball making machine. At the same time, a flow meter can be used to mea...

Embodiment 2

[0027] An environmentally friendly cementitious material for sludge, the difference from Example 1 is that a special curing agent of 7% by weight is added during the dehydration treatment of the waste sludge, and the content of chitosan in the special curing agent is 5%; the special curing agent also contains: alkaline substance, water-absorbing agent, flocculant, and the total addition amount is 4% of the amount of waste mud; the alkaline substance is sodium hydroxide; the water-absorbing agent is anhydrous A mixture of sodium sulfate and anhydrous calcium sulfate; the flocculant is a mixture of ferric chloride, polyferric chloride and polyacrylamide.

[0028] Others are the same as in Example 1.

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PUM

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Abstract

The invention discloses a sludge-silt environment-friendly cementing material, which comprises the following raw materials by weight: 50-70% of pretreated waste mud, 15-30% of coarse sand, 2-15% of asilicon aluminum iron calcium oxide, and 10-20% of cement. The waste mud is silt or / and sludge. The pretreatment of the waste mud includes: performing dehydration treatment to a water content of lessthan 20%, removing large particles and residual waste, then conducting ball milling and crushing, and conducting 0.06-0.09mm negative pressure sieving to a sieve residue fineness of less than or equalto 40%. The silicon aluminum iron calcium oxide is one of or a mixture of several of fly ash, fine coal cinder, slag powder or coal gangue. The cementing material provided by the invention has the advantages of fast gelling speed, high compressive strength, low volume expansion rate, high stability and the like, realizes waste utilization, i.e. solves the current situation of low comprehensive utilization and environmental pollution of silt / sludge, and also solves the shortage problem of city construction new materials.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a sludge environment-friendly cementitious material and a preparation method thereof. Background technique [0002] During the cleaning and remediation of rivers, canals and lakes, a large amount of silt or sludge is produced, which contains a large amount of heavy metals, bacteria or organic pollutants. Improper handling can easily cause secondary pollution to soil, groundwater and air. Sludge / sludge is commonly used. The disposal methods include dumping in the ocean, stacking for drying and burying nearby, which will cause problems such as river and ocean pollution, the spread of stacked pollutants, and natural waste of land. my country's construction industry currently uses cement as a gelling agent, and the technology of using sludge / sludge to make a gelling agent is not yet perfect. convenience, etc. [0003] For example, Chinese patent application CN201611208486.3 dis...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/345C04B12/00C04B7/24C04B7/26C04B7/28C04B7/38C04B7/43C04B7/48
CPCC04B7/24C04B7/26C04B7/28C04B7/345C04B7/38C04B7/434C04B7/48C04B12/00C04B12/005Y02P40/10
Inventor 杨珈乐王景芸
Owner 武汉鹏森环境科技有限公司
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