Cooling device of alumina decomposition pond

Abstract

The invention relates to a cooling device of an alumina decomposition pond, which comprises a decomposition pond and a stirrer arranged in the decomposition pond. The cooling device is characterized in that a heat pipe is arranged at the top of the decomposition pond and extends into the decomposition pond through a hole reserved on a top plate of the decomposition pond, wherein a heated section L of the heat pipe is inserted into fluid of the decomposition pond for absorbing heat, and the heat is continuously conducted into a cooling section M through a working medium in the heat pipe; a spiral cooling water guide channel is welded between an external sleeve of the cooling section of the heat pipe and the heat pipe, circular cooling water enters the spiral cooling water guide channel through the cooling section and flows out from the top of the external sleeve of the heat pipe through the guide channel for carrying out heat exchange, thereby the aim of fluid cooling in the decomposition pond is achieved. The invention is convenient to install and reliable in operation, has no power consumption during the operation of the heat pipe, no material plugging and has long service life; the maintenance and the replacement are convenient as the single heat pipe works independently, and the maintenance off production is unnecessary.

Description

technical field [0001] The invention relates to a step-by-step cooling method for a metallurgical alumina decomposition pool, in particular to a cooling device for a multi-stage alumina decomposition pool. Background technique [0002] One of the key processes in the production of alumina is the decomposition process of the seed crystal, that is, the aluminum hydroxide is precipitated from the supersaturated sodium aluminate solution to obtain good quality aluminum hydroxide and a mother liquor with a high caustic ratio. When the composition of the sodium aluminate solution is constant, the key factors affecting the separation effect are the solution temperature and the degradation temperature during the decomposition process. When the temperature decreases, the supersaturation of the sodium aluminate solution will increase, which is conducive to improving the decomposition rate and yield. Yield, etc., so the intermediate cooling process of the decomposition process is parti...

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Problems solved by technology

Moreover, the plate heat exchanger equipment is very easy to block during operation, and the disassembly and maintenance are frequent, resulting in abnormal production and operation.

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