Causticizing method alkali preparation technology
A technology of causticization method and process, which is applied in the field of causticization method soda production process, and can solve problems such as pollution
Active Publication Date: 2015-05-13
CHENGDU INTERMENT TECH
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Problems solved by technology
[0005] The technical problem to be solved in this application is to provide a caustic soda production process using a membrane filtration device, the membrane filtration device has a high filtration efficiency and can improve the filter element pollution problem
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Embodiment
[0018] The causticizing solution with a temperature of 90-100°C after the causticizing reaction is introduced into a belt vacuum filter for preliminary solid-liquid separation, and then the causticizing solution with a solid content of about 700mg / L and a temperature of 70-85°C after the preliminary solid-liquid separation The liquid is subjected to precise membrane filtration, and the above-mentioned membrane filtration device is used when the causticizing liquid is precisely filtered, and finally the filtered high-purity sodium hydroxide solution (solid content 10mg / L) is output from the third port 1B.
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The invention discloses a causticizing method alkali preparation technology adopting a membrane filtration apparatus. The technology comprises the following steps: carrying out preliminary solid-liquid separation of a causticizing liquid subjected to a causticizing reaction, and carrying out precise membrane filtration of the causticizing liquid subjected to the preliminary solid-liquid separation, wherein the membrane filtration apparatus comprises a filter assembly positioned on a circulating flow path, the filter assembly comprises a shell and at least one membrane filter core installed in the shell, having two open ends and realizing filtration in an inside-feeding outside-discharge form, the shell is provided with a second port as a concentrated liquid output end, and the second port is connected with the circulating flow path through an operation mode switching control valve. When the filter assembly is in a filter state of a period, the operation mode switching control valve is in a closed state firstly, and the filter assembly runs in a first filter mode; and after the first filter mode is operated for a period of time, the mode switching control valve is triggered by a preset threshold value and is started, and the filter assembly continuously runs in a second filter mode.
Description
technical field [0001] The invention relates to a causticizing soda production process. Background technique [0002] The causticizing method is one of the main methods for producing caustic soda (sodium hydroxide). The current general process is to mix alkaline water (sodium carbonate solution) with milk of lime, and then carry out causticizing reaction in the causticizing tank, and then from the causticizing The causticizing solution is discharged from the tank. At this time, the causticizing solution is relatively turbid and contains a large amount of insoluble matter (mainly calcium carbonate). Because these solid particles are small and difficult to filter, it is necessary to use a clarification tank for clarification. After clarification Finally, light caustic lye is obtained by overflowing from the upper part of the clarifier, and the light caustic lye is concentrated to obtain solid concentrated caustic lye or caustic soda. In this process, the effect of solid-liqui...
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IPC IPC(8): C01D1/28B01D36/04
Inventor 高麟汪涛樊彬
Owner CHENGDU INTERMENT TECH