Method for removing ammonium from alkali production by full brine ion-exchange membrane electrolysis
An ionic membrane electrolysis and brine technology, applied in electrolysis components, electrolysis process, chemical instruments and methods, etc., can solve the problems of production impact, serious packing fouling, etc., and achieve the effects of cost saving, corrosion reduction, and simple process flow.
Inactive Publication Date: 2010-12-29
XINWEN MINING GROUP
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[0021] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0022] As can be seen from Fig. 1 and Fig. 2, compared with the prior art, the process of the present invention differs in that the 32% NaOH solution in the original process is replaced with waste chlorine water in the electrolysis section. The specific process flow is: the brine from the brine mining station enters the baffle tank 1, and after adding 10% sodium hypochlorite and chlorine water, the ammonia removal reaction is completed in the ammonia removal reaction tank 3. While entering the ammonia blowing tower 2 from the bottom, another compressed air from the blower 4 enters the ammonia blowing tower 2 from bottom to top, contacts with the brine countercurrently, blows off fully, and the monochloramine salt is taken out of the system by the air, after the ammonia is removed The brine enters the brine storage tan...
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Abstract
The invention discloses a method for removing ammonium from alkali production by full brine ion-exchange membrane electrolysis, which comprises the following step: adding sodium hypochlorite solution of which the weight percent concentration is 10 percent into brine to react with chlorine water of an electrolysis section, wherein the pH value is controlled to be between 5.0 and 6.0, the addition of the sodium hypochlorite solution and the chlorine water ensure that the content of hypochlorite in the solution after the reaction is between 10 and 80 PPm, the ammonium content is less than or equal to 1 ppm, and the brine concentration after removing the ammonium accords with the index of between 295 and 310 grams per liter. The method using the chlorine water to replace sodium hydroxide solution to remove the ammonium, thereby thoroughly eliminating the potential safety hazard caused by high ammonium content in the brine in a feed trough, reducing the manufacturing cost of whole bittern alkali, reducing the environmental pollution, and creating good economic benefits and social benefits.
Description
technical field [0001] The invention relates to a method for removing ammonium, in particular to a method for removing ammonium in the electrolytic alkali production process of the whole brine ion membrane method. Background technique [0002] In the whole brine ion membrane electrolytic alkali production process, due to the high content of inorganic ammonium, organic ammonium and ammonia (collectively called ammonium) contained in the brine, nitrogen trichloride is easily generated during the electrolysis process, and nitrogen trichloride is a kind of Yellow viscous substance or rhombohedral nitrogen-containing compound, specific gravity relative to water is 1.653, melting point is less than 71°C, natural explosion temperature is 95°C. When the volume percentage in chlorine reaches 5%-6%, there is a possibility of explosion. At 60°C, it can decompose and explode under vibration or ultrasonic conditions. It can explode instantly under the sunlight and magnesium light. The ...
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IPC IPC(8): C25B1/16C25B15/00C02F1/58
CPCY02W10/37
Inventor 张文静
Owner XINWEN MINING GROUP