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Device and method for treating wastewater produced during acid process extraction of aluminium oxide from coal ash

A waste water treatment and fly ash technology, which is applied in the direction of neutralization water/sewage treatment, water/sewage treatment, natural water treatment, etc., can solve the problems such as the difficult treatment of waste water, achieve the purpose of maintaining the treatment temperature, ensuring the treatment effect, and alleviating the water pollution. Effects of Resource Scarcity Situations

Active Publication Date: 2015-04-22
CHINA SHENHUA ENERGY CO LTD +1
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Problems solved by technology

[0005] The purpose of the present invention is to provide a waste water treatment device and method for extracting alumina in fly ash by acid method, so as to solve the problem that the waste water of alumina in fly ash extracted by acid method is difficult to handle, so as to improve the comprehensive utilization rate of waste water and reduce the waste water disposal

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  • Device and method for treating wastewater produced during acid process extraction of aluminium oxide from coal ash
  • Device and method for treating wastewater produced during acid process extraction of aluminium oxide from coal ash

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Embodiment

[0073] A pilot plant for extracting alumina from fly ash by acid method has an annual output of 4,000 tons of alumina, and the discharge of waste water during a certain period is 530m 3 / d, wherein, the secondary gas condensate flow rate is about 120m 3 / d, the pH value is about 2, the TDS value is less than 400mg / L, and the suspended matter content is less than 400mg / L; the temperature of the wastewater in the alkali washing tower is about 10-15°C, and the flow rate is about 10m 3 / d, the pH value is about 2, the TDS value is less than 400mg / L, and the suspended solids content is less than 400mg / L; the flow rate of the circulating water waste water is about 350m 3 / d, the pH value is 6-7, the TDS value is about 1600mg / L, the suspended matter content is about 11000mg / L; the flow rate of the softened high brine is about 50m 3 / d, the pH value is 7, the TDS value is about 12000mg / L, and the suspended matter content is less than 600mg / L.

[0074] use as figure 1 and 2 The wast...

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Abstract

The invention discloses a device and method for treating wastewater produced during acid process extraction of aluminium oxide from coal ash. The device for treating the wastewater comprises an adjusting tank, an intermediate water tank, a pipeline filter, ultra-filtration equipment, a primary reverse osmosis system and a secondary reverse osmosis system. The invention also discloses a method for treating the wastewater by utilizing the device disclosed by the invention. By adopting the device and the method for treating the wastewater produced during the acid process extraction of the aluminium oxide from the coal ash, penetrating fluid with the volume more than 80% that of the wastewater can be recycled as circulating water, bad influences of discharged salt-containing wastewater to the local water environment are reduced, and the increasingly severe water resource shortage situation is also alleviated.

Description

technical field [0001] The invention belongs to the field of industrial waste water treatment, and in particular relates to a waste water treatment device and method capable of treating waste water extracted from fly ash by a one-step acid dissolution method. Background technique [0002] The increasingly severe situation of water resource shortage in my country, especially the green GDP construction vigorously advocated by the state and the proposal of circular economy, make it particularly important for enterprises to save water, reduce emissions and utilize waste water resources. Therefore, how to economically, efficiently and reliably improve the comprehensive utilization rate of water resources of enterprises and even reach the "zero discharge" standard is an important task for enterprises to meet the environmental protection requirements of the state and local governments and establish a responsible image of enterprises. [0003] With the concept of "circular economy m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/34
CPCC02F1/441C02F1/444C02F1/52C02F1/66C02F9/00C02F2103/34
Inventor 郭昭华
Owner CHINA SHENHUA ENERGY CO LTD
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