System and method for cyclic utilization of water in production process of electrical filling material namely aluminium oxide

Abstract

The invention discloses a system for cyclic utilization of water in the production process of an electrical filling material namely aluminium oxide. The system comprises a chemical addition tank, a wastewater sedimentation pool, a circulation water pool and a water use process, wherein the chemical addition tank is located above a pipeline entering the wastewater sedimentation pool for fully mixing chemicals with acidic wastewater in advance and avoiding stirring in the wastewater sedimentation pool; the wastewater sedimentation pool is arranged into a five-stage sedimentation pool; the heights of overflow openings of the five-stage sedimentation pool are successively reduced from front to back for fully separating fine powder and suspended matters from the water; the wastewater sedimentation pool and the circulation water pool are directly connected through a wastewater pipeline; the circulation water pool is connected with the water use process; and a water filtering tank is arrangedbetween the circulation water pool and the water use process for further removing the suspended matters in recycled water. The system provided by the invention can achieve a recycled water reutilization rate of 90% or above, so great economic benefits can be obtained, and good social benefits and environmental benefits can be brought at the same time.

Description

technical field [0001] The invention relates to the technical field of water recycling in the industrial production process, in particular to a water recycling system and method in the production process of filler alumina. Background technique [0002] At present, with the development of my country's industry, the consumption of fresh water has increased rapidly, and many areas are facing a serious water crisis. In urban water, industrial water accounts for about 60-80% of the total water consumption. However, relevant data show that the average reuse rate of industrial water in my country is 40-50%. [0003] my country's urban industry consumes 340 cubic meters of water per 10,000 yuan of output value, which is 10 to 20 times that of developed countries. The high water consumption and low reuse rate are prominent problems in the utilization of water resources in my country's industrial systems. Therefore, saving industrial water and maximizing the use of limited water sour...

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Problems solved by technology

At present, there is no research on the treatment of wastewater from electrical filler alumina. The characteristics of untreated wastewater are mainly alumina fine powder and acid. The current process of treating wastewater containing suspended solids generally adopts the addition of flocculants or coagulants. The method makes the suspended matter form sediment, and then discharges the sediment, but the flocculant and coagulant aid used for the direct discharge of the sediment still pollute the environment. At present, the treatment of acidic wastewater is generally directly neutralized in the sedimentation tank. This method requires stirring to make the neutralization uniform, but it affects the formation of sediment in the sedimentation tank during the stirring process, which is not conducive to removing the sediment contained in the wastewater

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