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Method for producing belite-gypsum material by using sludge and waste gypsum through dry-process rotary kiln

A technology for gypsum material and waste gypsum, which is applied in the field of production of belite-gypsum materials, can solve the problem of not providing simultaneous large-scale consumption of bulk waste residue, etc., and achieves the effect of solving flammability, low cost and high early strength

Active Publication Date: 2015-03-25
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The prior art also does not provide a method that can simultaneously absorb large-scale waste residues such as sludge and industrial waste gypsum, and effectively and economically produce new materials such as belite-gypsum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) The raw sludge of the sewage treatment plant is modified by ridge grain seeding, and the water content of the sludge is 99% and the dry solid content is 1%; cement powder is used as the ridge seed crystal agent, and the amount of cement powder is 4Kg is used for one ton of sludge, and the accelerator is ZC-D1 powder activated modified accelerator developed by Changsha Zichen Technology Development Co., Ltd. The dosage is 50% of the quality of the ridged seed crystal agent, that is, 2Kg per ton of sludge.

[0046] Pump the sludge into the ridge tank, add cement and accelerator powder directly into the sludge according to the above ratio under continuous stirring, and continue stirring at 120 rpm for 2 hours to perform ridge seeding treatment, and then The sludge mixture treated with ridge grain seeding was pumped into the chamber filter press for pressure filtration, and solid-liquid separation was performed to obtain modified sludge residue. The filtrate was clear wa...

Embodiment 2

[0051] (1) The original sludge of the sewage treatment plant was modified by ridge grain seeding, and the moisture content of the sludge was detected to be 98.2%, and the solid phase content of the dry basis was 1.8%. Cement powder is used for the ridged seed crystal agent, the amount of cement powder is 9Kg per ton of sludge, and the accelerator is ZC-D2 powder activation modified accelerator developed by Changsha Zichen Technology Development Co., Ltd. 50% of the mass ratio, that is, 4.5Kg per ton of sludge.

[0052] Pump the sludge into the ridge tank, add cement and accelerator powder directly into the sludge according to the above ratio under continuous stirring, and continuously stir the sludge mixture at 90 rpm for 2 hours to seed the ridge grains. The sludge mixture treated by ridge grain crystal seeding is pumped into the box filter press for pressure filtration, and the solid-liquid separation is carried out to obtain modified sludge residue. The filtrate is clear wa...

Embodiment 3

[0058] (1) The county clearing ditch sludge was modified by ridge grain seeding, and the moisture content of the sludge was detected to be 78.3%, and the solid phase content of the dry basis was 21.7%. Cement powder is used for the ridged seed crystal agent, the amount of cement powder is 50Kg per ton of sludge, and the accelerator is ZC-D3 powder activation modified accelerator developed by Changsha Zichen Technology Development Co., Ltd. 50% of the amount of cement powder added, that is, 25Kg per ton of sludge.

[0059] Pump the sludge into the ridge tank with a plunger pump. Under continuous stirring, add cement and accelerator powder directly into the sludge according to the above ratio, and stir continuously at 90 rpm for 3 hours to perform ridge seed crystallization. Then pump the sludge mixture treated by ridge grain crystal seeding into the box filter press for pressure filtration, and perform solid-liquid separation to obtain modified sludge residue. The filtrate is c...

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Abstract

The invention discloses a method for producing a belite-gypsum material by using sludge and waste gypsum through a dry-process rotary kiln. The method comprises the following steps of (1) melting a sludge ridge grain seed crystal with high water content into modified sludge residues; (2) proportioning raw materials of the modified sludge residues, the waste gypsum and a correcting material according to a certain ratio, and grinding the raw materials by using a vertical mill to form raw material powder; (3) delivering the raw material powder obtained in the step (2) into a dry-process rotary kiln system, and calcining the raw material powder to form clinker; and (4) grinding the obtained clinker to obtain powder with the fineness of 0.08mm and the screen residue content of less than 20%. The method disclosed by the invention is simple, low in investment and cost, free of other secondary pollution and capable of absorbing the sludge and the waste gypsum on a large scale and in a recycling way, greatly reducing the energy consumption and relieving the environment pollution.

Description

technical field [0001] The invention relates to a method for producing belite-gypsum material by using sludge and waste gypsum, in particular to a method for producing belite-gypsum material by using sludge and waste gypsum in a dry method rotary kiln. Background technique [0002] At present, my country has built more than 3,000 sewage treatment plants, and each sewage treatment plant produces more than 30 million tons of primary sludge (with a water content of about 99%) every day, so my country's sewage discharge has actually exceeded 5×10 10 m 3 / d. The moisture content of raw sludge can only be reduced to about 80% after further conventional mechanical dehydration treatment. If all the sewage is treated, it is estimated that every 10,000 cubic meters of sewage contains 5 tons of wet mud with a moisture content of 80%, and the amount of sludge generated per day can exceed 2.5 million tons, and the amount of sludge generated annually can exceed 900 million tons. Howeve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/26
Inventor 尹小林尹无忌
Owner 长沙紫宸科技开发有限公司
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