Equipment and method for slowing down salt-sodium sulfate co-production sodium sulfate flash tank scaling

A salt-nitrate co-production and nitrification flash technology, applied in chemical instruments and methods, alkali metal sulfite/sulfite, alkali metal chloride, etc., can solve the problem of affecting production and steam consumption, reducing the composition of the nitric system and other problems, to achieve the effect of simple structure, slow down the generation of salt scale, and prolong the operation cycle

Active Publication Date: 2015-12-23
HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD
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  • Application Information

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Problems solved by technology

A large amount of fresh water entering the system will reduce the composition of the nitric system, and the solid-liquid ratio of salt and nitric acid will dissolve back, which will seriously affect the output and steam consumption

Method used

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  • Equipment and method for slowing down salt-sodium sulfate co-production sodium sulfate flash tank scaling

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Embodiment Construction

[0011] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0012] Such as figure 1 As shown, the co-production of salt and nitrate is based on the fact that the solubility of NaCl in water increases with the increase of temperature, and Na 2 SO 4 The principle that the solubility in water decreases with the increase of temperature, and the separation of NaCl (ie salt) and Na in the raw brine 2 SO 4 (ie nitrate). The specific loop part is as figure 1 As shown, the feed liquid is heated through the primary preheater 2 and the secondary preheater 3 through the circulation pump 1, so that the Na in the feed liquid 2 SO 4 The solubility becomes smaller and the solubility of NaCl increases. Then the feed liquid enters the nitric acid evaporation tank 4 to evaporate moisture, so that Na 2 SO 4 precipitation, the concentration of NaCl increases. Then the feed liquid with higher NaCl concentration is p...

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Abstract

The invention provides equipment and method for slowing down salt-sodium sulfate co-production sodium sulfate flash tank scaling. The tank includes a circulation part, wherein the circulation part consists of a circulation pump, a preheater, a sodium sulfate evaporation tank, a sodium sulfate flash tank and a salt evaporation tank that are connected in order. The solid salt slurry flowing out of the salt evaporation tank is led to a salt slurry bucket, the effluent liquid is connected to the inlet of the circulation pump, the outlet of the salt slurry bucket is provided with a salt slurry pump, and the salt slurry pump conveys the salt slurry to a centrifuge through a salt slurry pump outlet pipe, and then salt can be collected. The equipment is characterized in that: the salt slurry pump outlet pipe is provided with a section of a reflux branch pipe communicated with the sodium sulfate flash tank, and the reflux branch pipe is equipped with a flow control valve. The equipment and method provided by the invention are beneficial to precipitation growth and flash operation of crystals in the sodium sulfate flash tank, can slow down the production of salt scale and prolong the operation period, and have very strong practicability.

Description

technical field [0001] The invention relates to the technical field of salt and nitrate co-production technology, in particular to a device and method for slowing down scaling of a flash tank for salt and nitrate co-production. Background technique [0002] Salt and nitrate co-production is a main method of producing table salt at present, which is to use sodium sulfate type water to mine brine to produce table salt and anhydrous nitrate. Generally, the old brine-salt-nitration co-production process introduced from Sulzer, Switzerland. However, this process has been facing the problem of serious fouling of the flash tank of nitric acid. Generally, about 15 days after the operation of the salt-nitrate co-production unit, due to the small nucleation, small solid-liquid ratio, and large amount of circulating mother liquor in the flash evaporation process, it is easy to cause salt formation on the tank wall and transfer pipe of the salt-nitrate flash tank Scale, and gradually ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/06C01D5/00
Inventor 李元海周志江彭善俊彭美凡张立武
Owner HUBEI SHUANGHUAN SCIENCE AND TECHNOLOGY STOCK CO LTD
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