Novel technology for yellow phosphorus tail gas purification

Abstract

The invention provides a novel technology for purifying yellow phosphorus tail gas to obtain fuel gas or raw material gas. Through a novel swirling technology, tail gas is fast cooled and shrunk in a tower, fully contacts with rotatingly-dispersed liquid drops and is raised spirally so that a centrifugal force is produced and throws the liquid drops, dust and yellow phosphorus to a tower wall and thus yellow phosphorus recovery, dust removal, silicon fluoride hydrolysis and fluorosilicone removal are substantially improved. Under the conditions of acidity, a normal temperature and a surfactant, a copper sulphate solution and hydrogen sulfide/hydrogen phosphide in tail gas undergo a reaction to fast produce a nanometer copper sulphide/copper suspension fluid, and the atomized nanometer copper sulphide/copper suspension fluid can undergo a fast oxidation-reduction reaction under the action of air to produce copper sulphate, and according to the above characteristics, the novel purifying technology for removing hydrogen sulfide and hydrogen phosphide by copper sulphate purification-air regeneration recycle is developed. The novel technology is verified in a million-ton level production line. The novel technology improves a yellow phosphorus production technical level, promotes tail gas resource utilization, reduces discharge of acidic gas and dust causing haze and has substantial economic, social and environmental protection benefits.

Description

technical field [0001] The invention relates to a new device and a new process for purifying yellow phosphorus tail gas as fuel gas or raw material gas. Background technique [0002] The process of producing yellow phosphorus by the electric furnace method is to use silica as a cosolvent and coke as a reducing agent in an electric furnace to react at high temperature to form P 4 , the equation is as follows: [0003] 4Ca 5 F(PO 4 ) 3 +30C+21SiO 2 ===3P 4 +30CO+20CaSiO 3 +SiF 4 [0004] The generated furnace gas is washed and cooled by a three-stage condensation tower to recover phosphorus. The main component of the remaining yellow phosphorus tail gas is CO (>85%), and also contains elemental phosphorus, phosphide, sulfide, fluoride, dust and other impurities. For every 1t of yellow phosphorus produced, 9-11t of phosphate rock, 1.5-2t of coke, and 1.5-2t of silica are required to produce 2500-3200Nm 3 Yellow phosphorus tail gas, raw materials, control of product...

AI Technical Summary

Problems solved by technology

Exhaust gas washing and purification steps (attached figure 2 shown) consists of three series-connected washing t

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