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Method for producing belite-gypsum material by calcining sludge and waste gypsum through vertical kiln

A technology of gypsum materials and waste gypsum, which is applied in the field of production of belite-gypsum materials, can solve the problems of not providing synchronous large-scale consumption of waste slag, and achieve the effects of low cost, good grindability, and reduced energy consumption

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

[0044] (1) The moisture content of raw sludge is 99%, and the solid content of dry basis is 1%. Cement powder for ridged seed crystal agent, the amount of cement powder is 4Kg per ton of sludge, choose the ZC-D1 powder activation modification accelerator developed by Changsha Zichen Technology Development Co., Ltd., the amount is the mass ratio of ridged seed crystal agent 50% of that, that is, 2Kg per ton of sludge.

[0045] Pump the sludge into the ridge tank, add cement and accelerator powder into the sludge under continuous stirring, continue stirring at 120 rpm for 2 hours to seed the ridge grains, and pump the treated sludge mixture into the tank Type filter press dehydration and separation to obtain solid modified sludge residue, the filtrate is clear water, the water content of modified sludge residue was detected to be 34.6%, and it was directly used for raw meal ingredients;

[0046] Waste gypsum is prepared from fresh bulk phosphogypsum;

[0047] The waste rock sl...

Embodiment 2

[0057] (1) The raw sludge of the sewage treatment plant has a moisture content of 98.2% and a solid content of 1.8% on a dry basis. 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.

[0058] Pump the sludge into the ridge tank, add cement and accelerator powder into the sludge under continuous stirring, and continuously stir the sludge mixture at 90 rpm for 2 hours to seed the ridge grains. The chemically treated sludge mixture is pumped into a chamber filter press for dehydration and separation. The filtrate is clear water. The water content of the filter residue is 31.9%. After 5 days of natural air drying, the water content of the filter residue drops to 9% and sent to the raw material batching place for batching.

[0059] The w...

Embodiment 3

[0069](1) The water content of clearing ditch sludge is 78.3%, and the dry basis solid phase content is 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 mass ratio, that is, 25Kg per ton of sludge.

[0070] Pump the sludge into the ridge tank with a plunger pump, add cement and accelerator powder to the sludge under continuous stirring, and continuously stir the sludge mixture at 90 rpm for 3 hours to seed the ridge grains. The mud mixture is pumped into a chamber filter press for dehydration and separation. The filtrate is clear water. The moisture content of the filter residue is 31.4%. After 2 days of natural air drying, the moisture content of the filter residue drops to 12% and is sent to the raw material place for batching.

[0071] Waste gypsum is prepared from ...

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Abstract

The invention discloses a method for producing a belite-gypsum material by calcining sludge and waste gypsum through a vertical 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) carrying out two-stage proportioning on raw materials of the modified sludge residues, the waste gypsum and a correcting material according to a certain ratio, homogenizing, adding a proper proportion of fire coal in the proportioning and homogenizing processes, and molding grains or charging bars to obtain a black raw material molding material; (3) delivering the obtained black raw material molding material into the vertical kiln, and calcining the black raw material molding material at the temperature of 1250-1400 DEG C to form clinker; and (4) grinding the obtained clinker to obtain powder. 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, in particular to a method for producing belite-gypsum material by calcining and roasting sludge and waste gypsum in a vertical 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. However, due to economic and te...

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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