High-efficiency desulfurization waste liquor salt extraction recycling device

Abstract

The invention discloses a high-efficiency desulfurization waste liquor salt extraction recycling device. The device comprises a two-stage filtering device formed by connecting two micro-porous ceramic filtering devices with each other, wherein each micro-porous ceramic filtering device comprises a tank body (5) and a seal head (1); a liquid inlet (6) is formed in the lower part of the tank body; a liquid outlet (8) is formed in the upper part of the tank body; a backwash opening (9) is formed in the liquid outlet; a supporting disc (2) is arranged in the tank body; liquid outlet holes (19) are formed in the supporting disc at intervals; limiting sleeves (3) are fixedly arranged on the lower bottom surface of the supporting disc at intervals; the limiting sleeves are tightly connected with the outer diameters at the upper ends of micro-porous ceramic pipes in a matched mode; the micro-porous ceramic pipes are connected with a pressing plate (13); a riding fixing rack (18) is fixedly arranged on the supporting disc; and pull rods (15) through which the micro-porous ceramic pipes can be fixedly arranged on the supporting disc in a suspended mode at the intervals are arranged between the riding fixing rack and the pressing plate. According to the device disclosed by the invention, the occupied space can be reduced, the construction cost is saved, the filtering effect of desulfurization waste liquor can be improved, desulfurization liquor is conveniently filtered, and the backwash is conveniently performed.

Description

technical field [0001] The invention relates to a waste liquid purification and recovery device, in particular to a high-efficiency desulfurization waste liquid salt extraction and recovery device. Background technique [0002] In the desulfurization of coking plants using ammonia as the alkali source and the use of dinuclear ammonium phthalocyanine cobalt sulfonate (PDS) catalysts, the salt content in the desulfurization liquid will gradually increase. When the salt content reaches 250g / L or more, the desulfurization efficiency will increase. reduce. Therefore, part of the desulfurization liquid (desulfurization waste liquid) must be discharged outside during the desulfurization process, and part of the new ammonia liquid must be added to control the salt content in the desulfurization liquid within the specified requirements, thereby ensuring the desulfurization effect. The discharged desulfurization waste liquid contains ammonium thiocyanate, ammonium thiosulfate, ammoni...

AI Technical Summary

Problems solved by technology

However, the existing desulfurization waste liquid is mainly filtered by two-stage filtration of coke and microporous ceramic tubes. The main problem of this two-stage filter device is that after a period of treatment by the first-stage coke filter device, due to the adsorption of desulfurization waste liquid by coke After the insoluble degradation products in the medium, it is easy to deposit on the surface and inside of the coke to form passivation, block the filter pores, thereby reducing the adsorption and filtration effect. The coke filter device cannot be backwashed and regenerated, and the coke must be replaced regularly, which increases the processing time. Cost; Coke filtration has disadvantages such as huge equipment, large floor space, difficult maintenance, short operation period and poor treatment effect due to inability to backwash, which seriously restricts the performance of the entire desalination system

The two-stage microporous ceramic tube filter device is a new high-efficiency filtration process. At present, there are many microporous ceramic tube filter devices used for industrial waste liquid, but most of the existing microporous ceramic tube filter devices are waste liquid entering the ceramic tube first. , and then seep from the inside of the tube to the outside of the tube. The biggest disadvantage of this method is that a large amount of refractory substances accumulate in the tube, which is easy to cause blockage, and the pressure difference between the inside and outside of the tube is large, causing the filter tube to burst and seriously affecting the filtration and seepage of the off-flow waste liquid. , reducing the filtering effect

Secondly, most of the existing microporous ceramic filter devices are fixed in both directions up and down, the structure is relatively complicated, the processing, installation and maintenance are inconvenient, and the cost is high

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