A kind of method for preparing large particle size ammonium metavanadate
An ammonium metavanadate, large particle size technology, applied in the field of vanadium chemical industry, can solve problems such as unfavorable large-scale promotion, inflexible parameter control, complicated operation, etc., and achieves good application prospects, high degree of automation, and high particle strength.
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[0035] The method for preparing large particle size ammonium metavanadate that a kind of specific embodiment of the present invention provides can adopt figure 1 The crystallizer provided in. During the preparation process, the solution in the ammonium metavanadate solution buffer tank is first added to the crystallizer through the feed pump until the liquid level reaches the overflow port; then the cooling water pump and the circulation pump are turned on, and the flow rate of the cooling water and the circulation pump are adjusted The frequency controls the cooling rate of the crystallizer; after the temperature of the ammonium metavanadate solution in the crystallizer reaches a predetermined value, start the feed pump and continuously add the ammonium metavanadate solution to the crystallizer to control the cooling rate and temperature of the solution in the crystallizer. And turn on the discharge pump to discharge the material. During the crystallization process, the liqui...
Embodiment 1
[0038] (1) Open feed pump, be that the ammonium metavanadate solution of 20.12g / L is added in the crystallizer by concentration, arrive overflow port to liquid level, stop feeding;
[0039](2) Turn on the cooling water and circulating pump, and control the cooling rate of the crystallizer to 0.5°C / h by adjusting the cooling water flow and circulating pump frequency, until the solution temperature in the crystallizer drops to 30°C, and control the cooling water return and crystallization of the crystallizer The temperature difference of the solution in the vessel is ≤1°C;
[0040] (3) After the temperature of the solution in the crystallizer reaches 30°C, start the feed pump to feed continuously, and the feed flow rate is 6m 3 / h, continuously add ammonium metavanadate solution to the crystallizer, control the cooling rate to 4°C / h, keep the temperature of the solution in the crystallizer at 30°C, and at the same time turn on the discharge pump to discharge continuously to ensu...
Embodiment 2
[0044] (1) Open feed pump, be that the ammonium metavanadate solution of 25.68g / L is added in the crystallizer by concentration, arrive overflow port to liquid level, stop feeding;
[0045] (2) Turn on the cooling water and circulating pump, and control the cooling rate of the crystallizer to 1°C / h by adjusting the cooling water flow and circulating pump frequency, until the solution temperature in the crystallizer drops to 35°C, and control the cooling water return and crystallization of the crystallizer The temperature difference of the solution in the vessel is ≤2°C;
[0046] (3) After the temperature of the solution in the crystallizer reaches 35°C, start the feed pump to feed continuously, and the feed flow rate is 8m 3 / h, continue to add ammonium metavanadate solution to the crystallizer, control the cooling rate to 3.5°C / h, keep the solution temperature in the crystallizer at 35°C, and at the same time turn on the discharge pump to discharge continuously to ensure that...
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