Indirect condensation and vacuum freezing crystallizer
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A technology of vacuum freezing and crystallizer, which is applied in the directions of heat exchange cooling crystallization, solution crystallization, evaporation separation crystallization, etc., which can solve the problems of low energy efficiency, high cost, and large amount of steam
Inactive Publication Date: 2020-08-11
GANFENG LITHIUM CO LTD
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Problems solved by technology
However, steam jet vacuum evaporation consumes a lot of steam, has low energy efficiency and high cost
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Embodiment 1
[0043] Embodiment 1: feed material liquid comprises following raw material by weight: LiOH 4.0%, NaOH 1.0%, NaOH 2 SO 4 30.0%, the temperature rise of the boiling point is about 10°C, and the feed temperature is 30°C;
[0044] When P1=2300Pa(A), the gas-liquid reaches equilibrium and starts to boil;
[0045] When P2=1700Pa(A), T2=25℃, Na starts to precipitate 2 SO 4 ﹒ 10H 2 O;
[0046] When P3=610(A), T3=10℃, reaching the crystallization end point;
[0047] At this time, the feed liquid contained the following raw materials in parts by weight: LiOH 11.7%, NaOH 2.9%, NaOH 2 SO 4 7.1%. Na 2 SO 4 ﹒ 10H 2 The O crystallization rate is 91.9%, the evaporation rate is 3.4%, and the LiOH concentration ratio is 2.9 times.
Embodiment 2
[0048] Embodiment 2: feed material liquid comprises following raw materials in parts by weight: LiOH 3.0%, NaOH 0.6%, NaOH 2 SO 4 30.0%, the temperature rise of the boiling point is about 5°C, and the feed temperature is 28°C;
[0049] When P1=2800Pa(A), the gas-liquid reaches equilibrium and starts to boil;
[0050] When P2=1800Pa(A), T2=21℃, Na starts to precipitate 2 SO 4 ﹒ 10H 2 O;
[0051] When P3=610(A), T3=5℃, reaching the end point of crystallization;
[0052] At this time, the feed liquid contained the following raw materials in parts by weight: LiOH 9.2%, NaOH 1.8%, NaOH 2 SO 4 4.2%. Na 2 SO 4 ﹒ 10H 2 The O crystallization rate is 95.6%, the evaporation rate is 3.9%, and the LiOH concentration ratio is 3.1 times.
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Abstract
The invention discloses an indirect condensation and vacuum freezing crystallizer which comprises a crystallization chamber, an indirect condenser, a vacuum pump set and a water seal tank. The crystallizer comprises a separation section, an evaporation section and a sedimentation section; a demister is arranged in the separation section; a baffle plate and a sedimentation section stirrer are arranged in the sedimentation section; a feeding-discharging tee joint is arranged at the bottom of the sedimentation section; an evaporation section stirrer is arranged in the evaporation section; a manhole is formed outside the evaporation section; the indirect condenser comprises a secondary steam pipeline and an intercooler; an air inlet of the intercooler is communicated with the top of the separation section of the crystallizer through the secondary steam pipeline; the vacuum pump set is arranged on the intercooler; and a vacuum port of the intercooler is communicated with the water seal tankthrough a water seal pipe. The indirect condensation and vacuum freezing crystallizer combines the advantage that a steam jet vacuum freezing crystallizer is not easy to scar and the advantage that an indirect freezing crystallizer is energy-saving, and has the advantages of high yield, simplicity and convenience in operation, stable index and the like.
Description
technical field [0001] The invention relates to, in particular to an indirect condensation vacuum freezing crystallizer. Background technique [0002] In the sulfuric acid metallurgical process, such as the production of lithium carbonate and lithium hydroxide monohydrate by the spodumene sulfuric acid method, a large amount of sodium sulfate will be produced due to the use of sulfuric acid and soda ash or liquid caustic soda. Whether sodium sulfate can be removed from the product solution with high efficiency and low consumption often affects production capacity and cost. The removal of sodium sulfate often adopts two methods: evaporative crystallization and freezing crystallization. [0003] In the production process, the method of freezing and crystallization is often used to obtain a higher primary crystallization rate of sodium sulfate. During the freezing process, sodium sulfate is precipitated in the form of sodium sulfate heptahydrate or sodium sulfate decahydrate ...
Claims
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Application Information
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