Method for reduction and decomposition of phosphogypsum with yellow phosphorus tail gas

Abstract

The invention relates to a method for reducing and decomposing ardealite by tail gas of phosphor. The method comprises that: the naturally dried ardealite is put into a reductive decomposition furnace and filled with the tail gas of phosphor for reaction, and the furnace temperature is controlled to be between 700 and 1,000 DEG C, and the reaction time is between 10 and 50 minutes. The obtained furnace gas in which the content of the sulfur dioxide in percentage by volume is more than or equal to 15 percent is used as a material gas for the double-rotation double-suction acid preparation process; and the content of CaO, namely a solid product is more than or equal to 70 weight percent and is used as a cement material.

Description

A method for reducing and decomposing phosphogypsum by yellow phosphorus tail gas 1. Technical field The invention relates to a method for producing high-concentration sulfur dioxide and qualified cement raw materials by using two by-products phosphogypsum and yellow phosphorus tail gas in phosphorus chemical production, belonging to the field of phosphorus chemical industry. 2. Background technology Phosphogypsum is the industrial waste produced by the reaction between phosphate rock and sulfuric acid in the production process of wet-process phosphoric acid. It is calculated that 4-5 tons of phosphogypsum will be produced for every ton of phosphoric acid produced. At present, the annual discharge of phosphogypsum in the world is more than 200 million tons, but the utilization rate of phosphogypsum is not more than 10%. The treatment, disposal and comprehensive utilization of phosphogypsum have become a worldwide problem. my country's phosphate fertilizer production ranks ...

AI Technical Summary

Problems solved by technology

1. The purpose of the invention: In order to support the development of circular economy technology, develop a method of reducing and decomposing phosphogypsum with yellow phosphorus tail gas to produce high-concentration sulfur dioxide and qualified cement raw materials, and at the same time solve the environmental pollution problems caused by yellow phosphorus tail gas and phosphogypsum , provide a new way for the rational utilization of yellow phosphorus tail gas and phosphogypsum, develop potential carbon-sulfur resources, form a circular economic industrial chain of phosphorus chemical industry, and realize the comprehensive utilization of yellow phosphorus tail gas and phosphogypsum