Device and method for recycling and reusing phosphorus-containing flue gas in yellow phosphorus storage tank

Abstract

The invention discloses a device and a method for recycling and recycling phosphorus-containing flue gas in a yellow phosphorus storage tank. The yellow phosphorus storage tank is connected with a buffer tank, the buffer tank is connected with a spray tower, the top of the spray tower is connected with an electrostatic mist eliminator, and the bottom of the electrostatic mist eliminator is connected to a dilute acid tank. The upper part of the spray tower is provided with an absorbent entering pipeline, and the flow rate is controlled by a first electromagnetic valve; the bottom of the spray tower is connected with a circulating acid pump through a pipeline, and then connected to the top of the spray tower, and the outlet pipe of the circulating acid pump is provided with a phosphoric acidrecovering pipeline. The device has the advantages of simple structure, convenient operation, and high-efficiency recycling of the phosphorus-containing flue gas in the yellow phosphorus storage tank. The present invention also discloses the method for recycling and recycling the phosphorus-containing flue gas in the yellow phosphorus storage tank. The recovery of the phosphorus-containing flue gas has high efficiency and short cycle, and the whole process has no phosphorus-containing flue gas leakage, and the absorbent utilization efficiency is high. No new impurity is introduced into recovered phosphoric acid, and the problems that the phosphorus-containing flue gas pollutes environment and damages the health of operators can be solved, and waste is changed into things of value.

Description

technical field [0001] The invention relates to the fields of phosphorus chemical technology and environmental protection, in particular to a device and method for recycling phosphorus-containing flue gas from a yellow phosphorus storage tank. Background technique [0002] Phosphorus is an important element of life, and high-purity phosphoric acid food additive is widely used in the food industry as a sour agent and a nutrient for yeast. With the rapid development of my country's electronics industry, high-purity phosphoric acid has also been widely used in the electronics industry. At present, the production of high-purity phosphoric acid is mainly produced by thermal phosphoric acid, which uses yellow phosphorus as raw material, and generates phosphoric acid through oxidation, hydration and other reactions. [0003] As a major hazard, yellow phosphorus is stored in a water seal. Since the melting point of yellow phosphorus is 44.1°C, it is easy to crystallize when stored ...

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Problems solved by technology

Among them, the combustion method is a traditional phosphine treatment method. Phosphine and air are mixed and burned in the incinerator to generate phosphoric acid fume, and the phosphoric acid fume is passed into the absorption tower to obtain industrial-grade phosphoric acid. The disadvantage of this method is that the incinerator uses electric Heating is a high-energy-consuming equipment; the wet treatment of phosphine uses sodium hypochlorite as an absorbent to generate relatively stable phosphates. The disadvantage is that a large amount of reaction by-product chlorine will cause secondary pollution, and the chemical properties of hypochlorous acid are not good. Stable, easy to decompose and fail, requiring frequent replacement of the absorbing fluid, increasing additional costs; temperature swing adsorption technology adopts activated carbon adsorption, the removal rate of phosphine is less than 20% to 30% in the initial trial operation, after two months of operation, the removal rate of down to less than 5%

[0006] Whether the above methods are chemical conversion method or adsorption method, they are mainly aimed at a large amount of phosphine gas, and most of them will cause a certain degree of secondary pollution.

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