Device for producing hydrated lithium hydroxide on basis of MVR and production method thereof

A lithium hydroxide and hydration technology, applied in chemical instruments and methods, lithium oxide;/hydroxide, separation methods, etc., can solve the problems of reduced heat transfer performance of heat exchange tubes, energy waste, and reduced system evaporation performance , to achieve the effect of increasing the gas-liquid separation height, reducing internal fouling, and reducing the frequency of fouling

CN108298569AInactive Publication Date: 2018-07-20SHANGHAI ZHONGTENG ENVIRONMENTAL PROTECTION TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-07-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a device for producing hydrated lithium hydroxide on the basis of MVR. The device includes a raw material tank, a condensate water preheater, a vapor preheater, a forced circulation evaporator, a thickener, a centrifugal machine, a compressor and a vapor separating bag. Raw materials in the raw material tank are conveyed into the condensate water preheater through a feedingpump, and the condensate water preheater is communicated with the vapor preheater through a pipe; the raw materials in the vapor preheater are conveyed into the forced circulation evaporator througha pipe, and the forced circulation evaporator comprises a first heater, a second heater and a crystal separator. The device has the advantages that the interior of a heat exchanging pipe of a forced circulation heater is polished, the adhesive force of crystals adhering to a wall in a solution can be effectively reduced, it is ensured that the flow velocity of the solution in the heat exchanging pipe can reach 2.5 m / s or above, and meanwhile the pipe wall is flushed to further reduce the scaling frequency in the heat exchanging pipe; at the same time, the superheat degree of an outlet of the heater is lowered, flash evaporation and pipe blockage are effectively prevented from occurring in the pipes, and a pipe blockage situation caused by locally massive crystallization due to an excessively high superheat degree is reduced.
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Description

technical field

[0001] The invention is an MVR-based device for producing hydrated lithium hydroxide and a production method thereof. Background technique

[0002] Lithium is the main element of new energy battery materials, and now the world's demand for lithium is doubling, especially in China. This has led to the massive production of hydrated lithium hydroxide.

[0003] The traditional process of generating hydrated lithium hydroxide generally uses a traditional three-effect evaporation system to evaporate and crystallize lithium hydroxide solution to crystallize hydrated lithium hydroxide. Since the lithium hydroxide solution is strongly alkaline, it is easy to foam during the evaporation and crystallization process, especially in the state of traditional multi-effect high heat transfer temperature difference, the foaming is particularly serious. At the same time, the system is very easy to form blocked pipes, which affects the heat transfer of the heat exchanger, red...

Examples

Embodiment Construction

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0029] see figure 1 , in an embodiment of the present invention, a device for producing hydrated lithium hydroxide based on MVR, including a raw material tank 1, a condensed water preheater 3, a steam preheater 4, a forced circulation evaporator, a thickener 10, and a centrifuge 11 , compressor 16 and sub-steam drum 17, the raw material in the raw material tank 1 is input into the condensed water preheater 3 through the feed pump 2, and the raw material is ini...