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Method for producing belite-gypsum material from roasted sludge and waste gypsum of furnace in fluid bed

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, etc., and achieve the problems of flammability, fast hardening, and reduction of grinding energy consumption Effect

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

[0046] (1) Raw sludge from sewage treatment plants, the water content of the sludge is 99% and the dry solid content is 1%. Cement powder for ridged seed crystal agent, the amount of cement powder is 4Kg per ton of sludge; ZC-D1 powder activation modification accelerator developed by Changsha Zichen Technology Development Co., Ltd. is selected, and the dosage is the mass ratio of ridged seed crystal agent 50% of that, that is, 2Kg per ton of sludge.

[0047] Pump the sludge into the ridge tank, add cement powder and accelerator powder to the sludge under continuous stirring, and continuously stir at 120 rpm for 2 hours to seed the ridge grains, and the treated sludge mixture Pumped into the chamber filter press for solid-liquid separation to obtain solid modified sludge, the filtrate is clear water, the moisture content of the modified sludge was detected to be 34.6%, and it was directly used for raw meal ingredients;

[0048] Phosphogypsum bulk material is used for waste gyp...

Embodiment 2

[0061] (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 for ridged seed crystal agent, the amount of cement powder is 9Kg per ton of sludge; ZC-D2 powder activation modification accelerator developed by Changsha Zichen Technology Development Co., Ltd. is selected, and the dosage is the mass ratio of ridged seed crystal agent 50% of that, that is, 4.5Kg per ton of sludge.

[0062] 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 the chamber filter press for solid-liquid separation to obtain solid modified sludge. The filtrate is clear water. The moisture content of the modified sludge is detected to be...

Embodiment 3

[0075] (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 as the ridge seeding agent, and the amount of cement powder is 50Kg per ton of sludge. The ZC-D3 powder activation modification accelerator developed by Changsha Zichen Technology Development Co., Ltd. is selected, and the dosage is 50% of the mass ratio of the ridged seed crystal agent, that is, 25Kg per ton of sludge.

[0076] 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 the chamber filter press for dehydration and separation to obtain solid modified sludge residue. The filtrate is clear water. The moisture content of the modified sludge residue is det...

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Abstract

The invention discloses a method for producing a belite-gypsum material from roasted sludge and waste gypsum of a furnace in fluid bed. The method comprises the following steps: (1) transforming high water-content sludge ridge grain seeds into modified sludge residues; (2) carrying out raw material compounding and homogenizing on the modified sludge residues obtained in the step (1) with waste gypsum, waste rock ballasts and a corrective material; (3) drying the raw material mixture obtained in the step (2) by virtue of hot exhaust air of the furnace in fluid bed, and carrying out flue gas desulfuration and sulfur fixation; (4) mixing the raw material mixture dried in the step (3) with a proper amount of fire coal, adding to the furnace in fluid bed and roasting into a clinker; and (5) grinding the clinker obtained in the step (4) to obtain powder, namely the belite-gypsum material, or taking the clinker obtained in the step (4) as the belite-gypsum material. The method is simple in process, low in control requirements, and low in grinding energy consumption and firing energy consumption; bulk waste residues such as sludge and industrial waste gypsum can be largely and widely dissolved; and the prepared belite-gypsum material is wide in application.

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 roasting sludge and waste gypsum in a fluidized fluidized furnace. 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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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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