Composite barium sulfate crystallization apparatus

Abstract

The invention discloses a composite barium sulfate crystallization apparatus. According to the composite barium sulfate crystallization apparatus, a barium sulfate solution to be crystallized is placed inside a main body, the barium sulfate solution is conveyed inside a heat exchanger by a servo motor through a water pump, heat exchange with water vapor is performed, the obtained solution flows into the main body again after the heat exchange and the heating, the cycle is repeatedly performed, the water vapor flows into a condenser through a water vapor pipeline so as to be condensed until the barium sulfate solution is boiled while the gas incapable of being condensed is discharged out from a non-condensable gas outlet, the barium sulfate solution enters a cooling crystallization tank through concentrated material liquid conveying pipe after the barium sulfate solution concentration is increased to a specified value, cooling is performed, and a crystallization process is completed inside a crystallizer. According to the present invention, with the apparatus, the two methods such as the solution concentration increasing and the solution temperature reducing are completely utilized to improve the crystallization speed and the quality, such that the production efficiency of the barium sulfate is easily improved.

Description

technical field [0001] The invention belongs to the technical field of separation and purification, in particular to a composite crystallization device formed by heating and continuous freezing. Background technique [0002] The crystallization process is the process of continuously forming crystal nuclei and growing crystal nuclei. There are many types of crystallizers, which can be divided into evaporation crystallizer and cooling crystallizer according to the method of obtaining supersaturated state of the solution; according to the flow mode, it can be divided into mother liquor circulation crystallizer and magma (that is, a mixture of mother liquor and crystal) circulation crystallizer; according to the operation The method can be divided into continuous crystallizer and batch crystallizer. [0003] Solution supersaturation is the driving force for crystals to crystallize out of solution, and the degree of supersaturation directly affects the speed of crystal nucleatio...

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Problems solved by technology

[0004] 1) In a crystallizer, usually only one crystallization temperature can be controlled, and it is difficult to effectively control the crystallization supersaturation, so that the formation of crystal nuclei and the speed of crystal growth cannot be effectively controlled;

[0005] 2) The kettle-type crystallizer is cooled by the jacket or the inner coil, the heat transfer area is small, the heat transfer is not large, and it is not suitable for large-scale

[0007] 3) Often due to the uneven cooling rate, the grain size of the product is uneven, and the fine grains formed during the crystallization process affect the subsequent solid-liquid separation, and even cause system blockage;

[0008] 4) Tank-type crystallizers with stirrers are usually small in size and have limited processing capacity. Large-scale frozen crystallization and separation devices need to use multiple tank-type crystallizers with stirrers in parallel, which requires a large number of equipment and occupies an area of Big;

[0010] 6) Since the aging device is set separately, the crystallization device has a large number of equipment and occupies a large area

In addition, when the low-temperature crystallization liquid flows from the crystallizer to the pipeline of the aging device, the flow rate may be low, the crystallization may continue, and the pipeline may bend, which may cause pipeline blockage and affect the continuous operation of the device

[0011] 7) The discharge port is set at the lower part of the kettle crystallizer, and the precipitated crystals will easily cause the discharge port to be blocked after settling to the bottom

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