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Red mud-based mixed acid chemical conditioner special for deep dewatering of dewatered sludge and use method of red mud-based mixed acid chemical conditioner

A deep dewatering and dewatering sludge technology, applied in water/sludge/sewage treatment, chemical instruments and methods, sludge treatment, etc., to achieve low cost and energy consumption level, solve outlet problems, and avoid technical difficulties

Active Publication Date: 2021-10-01
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The technical problem to be solved by the present invention is to provide a red mud-based mixed acid chemical conditioner specially used for deep dewatering of dewatered sludge and its use method to solve the current There are flaws in the technology

Method used

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  • Red mud-based mixed acid chemical conditioner special for deep dewatering of dewatered sludge and use method of red mud-based mixed acid chemical conditioner
  • Red mud-based mixed acid chemical conditioner special for deep dewatering of dewatered sludge and use method of red mud-based mixed acid chemical conditioner

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preparation example Construction

[0036] A preparation method of a red mud-based mixed acid chemical conditioner specially used for deep dehydration of dewatered sludge, specifically comprising the following steps:

[0037] 1) After drying the red mud, use a mechanical ball mill, crush it, and then sieve it for later use;

[0038] 2) Add strong acid to the pulverized red mud, heat it in a water bath, add additives for modification, and obtain a special mixed acid sludge conditioner;

[0039] During specific implementation, the red mud is a red mud sample made by dry stacking method, and the front-end process adopts Bayer method to produce alumina;

[0040]More specifically, in the above step 1), during the mechanical ball milling process, the rotating speed is controlled at 400-450rpm, the ball milling beads account for 40-50% of the volume of the ball milling tank, and the ball milling beads are composed of small ball milling beads, medium ball milling beads and large ball milling beads. Bead composition; th...

Embodiment 1

[0046] The dry red mud stacked in the red mud dry yard of the Bayer process aluminum smelter of Guangxi Xinfa Aluminum and Power Group was used as raw material to prepare the dewatered sludge deep dehydration conditioner:

[0047] After elutriating the dry heap red mud, dry it at 100°C, ball mill and pulverize it through a 200-mesh sieve. Put 10 g of red mud in sulfuric acid / hydrochloric acid mixed acid (50 ml of 3M hydrochloric acid and 50 ml of sulfuric acid), and heat in a water bath at 80°C for 3 hours. Then add 0.5% polydimethyldiallyl ammonium chloride, stir and react for 0.5 hour and set aside. Acid red mud based chemical conditioner, technical grade, was obtained.

Embodiment 2

[0049] The dry red mud piled up in the red mud dry yard of the Bayer process aluminum smelter of Aluminum Corporation of China is used as raw material to prepare the dewatered sludge deep dehydration conditioner:

[0050] After elutriating the dry heap red mud, dry it at 100°C, ball mill and pulverize it through a 200-mesh sieve. Put 10 g of red mud in sulfuric acid / hydrochloric acid mixed acid (50 ml of 1.5M hydrochloric acid and 50 ml of sulfuric acid), and heat in a water bath at 80°C for 5 hours. Then add 0.5% polydimethyldiallyl ammonium chloride, stir and react for 0.5 hour and set aside. Acid red mud based chemical conditioner, technical grade, was obtained.

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Abstract

The invention relates to a special red-mud-based mixed acid chemical conditioner for deep dewatering of dewatered sludge and a use method of the special red-mud-based mixed acid chemical conditioner. Under the condition of not depending on lime stabilization and heating drying, the requirement of outward transportation of the sludge (the water content is less than 50%) is met through chemical conditioning and mechanical filter-pressing dehydration. The preparation method of the mixed acid conditioner comprises the following steps: washing and drying the red mud, performing ball-milling and crushing, and sieving the material; adding strong acid, heating the material in a water bath, adding an oxidizing agent, adjusting the pH, and curing the material for later use. After the mixed acid conditioner is matched with the fly ash for pretreatment and conditioning, the final moisture content of the dewatered sludge can be ensured to be lower than 50% through a belt filter press, and the outward transportation requirement is met. The preparation and use processes of the conditioner have the characteristics of simplicity, high efficiency, economy and environmental protection.

Description

technical field [0001] The invention relates to the technical field of sludge treatment in municipal sewage plants, in particular to a red mud-based mixed acid chemical conditioner specially used for deep dehydration of dewatered sludge and a use method thereof. Background technique [0002] With the advancement of my country's urbanization process, the rate of urban sewage treatment continues to increase, and the amount of sludge produced by sewage treatment plants is naturally increasing. Sewage plants usually use concentration, digestion and mechanical dehydration to reduce the moisture content of the remaining sludge generated in the plant area to about 70-85%, and then transport it out for centralized disposal or reuse. However, with the further understanding of the hazards of sludge, the country began to pay more and more attention to sludge treatment, and successively updated the sludge treatment policies of urban sewage treatment plants. From the 2002 "Urban Wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/148
CPCC02F11/148
Inventor 李杰袁辰玮刘汨莎李风亭刘建勇茹少钦袁霄赵黄浦
Owner SHANGHAI UNIV
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