Red mud alkali liquor evaporation and concentration system

Abstract

The invention relates to a red mud alkali liquor evaporation and concentration system in the field of industrial red mud harmless treatment equipment. The red mud alkali liquor evaporation and concentration system comprises a preheating heat exchanger, a buffer separator, an evaporator, a steam compressor and an electric heating furnace, wherein the preheating heat exchanger comprises a shell pass and a single tube pass; a circulating liquid inlet pipe and a circulating liquid outlet pipe are arranged at the bottom end of the buffer separator, and a buffer liquid inlet pipe and a buffer steam outlet pipe are arranged at the top end of the buffer separator; the interior of the evaporator is divided into an upper temperature zone, a middle temperature rising zone and a lower temperature zone, and a heat insulation pipe and a plurality of heat exchange pipes are arranged in the middle temperature rising zone; a mixed alkali liquor inlet pipe and a concentrated alkali liquor outlet pipe are respectively arranged on two opposite side walls of the upper temperature zone; a separated steam inlet pipe and a mixed steam outlet pipe are arranged on the top wall of the upper temperature zone; and a blow-off pipe and a lower alkali liquor outlet pipe are arranged on the side wall of the bottom end of the lower temperature zone, and the lower alkali liquor outlet pipe is correspondingly communicated with a liquor inlet of an electric heating furnace. The evaporation and concentration system is simple in structure, convenient to operate and maintain and capable of improving the concentration effect and efficiency and reducing noise.

Description

technical field [0001] The invention relates to the field of industrial red mud harmless treatment equipment, in particular to a red mud lye evaporation and concentration system. Background technique [0002] As we all know, one of the main hazards of red mud is its strong alkalinity. The pH value of the original soil is above 12, which is highly corrosive to animals, plants, metals, and silicon materials. If it seeps into the ground or enters the water, it will cause Severe soil or water pollution; red mud dealkalization is one of the important process steps in the harmless treatment technology of industrial red mud. The filling of subsidence areas and subsidence areas, the replacement and arrangement of agricultural land, the production of commercial roadbed materials, or the production of carbonate cement and commercial concrete have extremely high resource application value, and the released alkali (mainly sodium carbonate) can also be used be used twice; [0003] The ...

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Problems solved by technology

[0003] The harmless red mud treatment technology is mainly divided into six parts: carbon capture, carbonization, washing and pressing, evaporation, alkali extraction and resource utilization, and the filtrate evaporation and concentration technology is one of the key technologies, which mainly uses the lye in the The content of sodium carbonate is concentrated; for the industrial application of red mud to alkali extraction, there are at least three defects in the existing evaporation concentration system: first, the system structure is bloated and complicated, and only using secondary steam for heat exchange often requires two, The evaporator with more than three stages of concentration can meet the concentration requirements, and the efficiency is low; second, in the process of raising the temperature of the original lye, it will cause noise due to excessive heat transfer temperature difference or steam bubbling, resulting in equipment ringing Too large; third, the existing evaporators and heat exchangers have complex and curved internal structures, which are not convenient for circulation and cleaning. Even if the original lye of red mud is washed and filtered, it cannot guarantee that there are no impurities

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