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Sludge solidification agent and sludge solidification method

A solidification method and solidification agent technology, applied in the field of sludge solidification, can solve the problems of high energy consumption, uneconomical, non-universal, etc., and achieve the effects of reducing preparation costs, lowering technical thresholds, saving transshipment costs and energy consumption

Inactive Publication Date: 2021-03-12
上海胜义环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is complex in process, requires professional factories and equipment, has great limitations, and is not universal
At the same time, this method also consumes a large amount of energy during the production process. Sometimes in order to achieve better adobe performance, some natural clay needs to be added, and harmful gases such as dioxin and sulfur dioxide will be released during the firing process, which is neither economical nor economical. Not environmentally friendly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of sludge solidifying agent, the sludge solidifying agent comprises: cement, lime, slag, sodium metasilicate and gypsum;

[0031] The mass fraction of each component is: 1%-30% of cement, 1%-30% of lime, 1%-30% of slag, 1%-20% of sodium metasilicate, and the balance is gypsum.

[0032] Specifically, the cement is No. 425 cement; the lime is quicklime, and the CaO content is ≥ 80%, and the fineness is 0.12mm ≤ 15%; the slag is s95 grade granulated blast furnace slag powder; sodium metasilicate is sodium metasilicate pentahydrate powder ; Gypsum is construction gypsum.

Embodiment 2

[0034] A kind of sludge solidification method, carries out sludge solidification according to described sludge solidification agent, comprises the following steps:

[0035] Step 1: Sludge removal, remove the impurities in the sludge through the grid and vibrating screen;

[0036] Step 2: Preliminary dehydration of the sludge, which is to reduce the moisture content of the sludge to below 110%;

[0037] Step 3: Adding materials and mixing, adding the preliminarily dehydrated sludge and the sludge solidifying agent into the mixer according to the dry mass ratio of 0.5-1:1, and stirring, the speed of the mixer is set at 250r / min, and the mixing time is 3-5min to obtain the sludge mixture;

[0038] Step 4: Press molding, pour the sludge mixture into the mold, and press it with a pressure of not less than 1.9 MPa through a hydraulic molding machine;

[0039] Step 5: Sprinkling and curing. Sprinkling and curing the pressed sludge. The curing period is not less than 28 days, and th...

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Abstract

The invention relates to the technical field of sludge solidification, in particular to a sludge solidification agent, which comprises cement, lime, slag, sodium metasilicate and gypsum. The sludge solidification agent specifically comprises the following components by mass percentage: 1%-30% of cement, 1%-30% of lime, 1%-30% of slag, 1%-20% of sodium metasilicate and the balance gypsum. The sludge solidification method comprises the following steps: 1, removing impurities from sludge; 2, preliminary dehydrating sludge; 3, adding the sludge solidification agent to be mixed with sludge; 4, performing compression molding; and 5, conducting watering and curing to obtain solidified sludge with expected strength. Compared with a traditional sludge solidification technology, the preparation costis reduced, secondary pollution is avoided, waste is treated with waste, and the green and environment-friendly principle is met.

Description

technical field [0001] The invention relates to the technical field of sludge solidification, in particular to a sludge solidification agent and a sludge solidification method. Background technique [0002] The current river and lake improvement projects are usually accompanied by a large amount of dredging silt. These silts are large in quantity, have extremely high water content, and contain a large amount of pollutants, so it is difficult to reuse them as building materials after solidification. [0003] The main idea of ​​the existing sludge solidification technology is to dry and grind the sludge after dehydration, and then bake it at high temperature to make building materials such as sintered bricks or ceramsite. This method is complex in process, requires professional factories and equipment, has great limitations, and is not universal. At the same time, this method also consumes a large amount of energy during the production process. Sometimes in order to achieve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/26C04B18/04
CPCC04B40/0039C04B28/26C04B2111/00784C04B7/00C04B18/141C04B12/04C04B2/02C04B11/00C04B18/0436Y02W30/91
Inventor 刘宁王政李文峰黄嘉琪蒋众喜聂鹏成
Owner 上海胜义环境科技有限公司
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