Method and device for smelting molten salt during aluminum oxide production

A melting device and alumina technology, applied in the direction of alumina/hydroxide, etc., can solve the problems of short service life, difficult maintenance, resource waste, etc., and achieve the effects of long service life, flexible start-up, and easy operation and management

CN102557089BActive Publication Date: 2014-06-04GUIYANG AL-MG DESIGN & RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2014-06-04

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Abstract

The invention discloses a method and a device for smelting molten salt during aluminum oxide production. According to the invention, the solid molten salt at a normal temperature is introduced into a molten salt storage tank, a steam heater is arranged in the molten salt storage tank, the steam with a pressure of 3-4MPa and a temperature of 250-270 DEG C is introduced into the steam heater, in order to smelt the heated molten salt by heating to higher than 142 DEG C, and then the smelted molten salt is pumped into the next process. The method and the device of the invention have the following advantages: the smelting conditions of the molten salt can be satisfied, the system is simple, the existing apparatuses of aluminum oxide plant can be fully used, the apparatus investment is reduced, the power supply is reduced, the reliability is high, the service life is long, the operation and management are convenient, the maintenance is easy and the like.
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Description

technical field

[0001] The invention relates to a molten salt melting method and device in alumina production, and belongs to the technical field of molten salt heating in a pipeline dissolution production alumina system. Background technique

[0002] Molten salt is a mixture of various nitrates, the main component is: NaNO 2 (40%), NaNO 3 (7%), KNO 3 (53%), melting point: 142°C, boiling point: 680°C, operating temperature range: 350-530°C, specific heat: 1.424kJ / kg·°C.

[0003] At present, in the alumina production system using the pipeline dissolution process, the molten salt is used as a high-temperature heat carrier to indirectly heat the pulp in the pipeline dissolution device, and conduct heat exchange with the pulp, so that the temperature of the pulp increases and the temperature of the molten salt decreases. The cooled molten salt is returned to the molten salt heating station, reheated in the molten salt heating furnace, and recycled. Since the molten salt is s...

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Embodiment Construction

[0015] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0016] Embodiment of the present invention: When molten salt heating is carried out in the existing pipeline dissolution production alumina system, a molten salt melting method in alumina production of the present invention is adopted for implementation, that is, the solid molten salt at normal temperature is sent to Into the molten salt storage tank, a steam heater is installed in the molten salt storage tank, and the steam with a pressure of 3MPa~4MPa and a temperature of 250℃~270℃ is introduced into the steam heater, so that the heated The molten salt reaches a temperature above 142°C and melts, and then the molten salt is pumped into the next process.

[0017] When implementing the above-mentioned method of the present invention, adopt the molten salt melting device in a kind of alumina production of the present invention to implement, the...