Phosphogypsum Dielectric Microwave Thermal Decomposition Of The Simulation Study

Phosphogypsum is the by-products of wet-process phosphoric acid production and for every 1 ton of phosphoric acid is about 5 tons of phosphogypsum discharged. According to incomplete statistics, The total annual production of phosphogypsum is more than 1 billion tons in world and is more than 50 million tons of China in 07 year,but the utilization rate of it is less than 10%.Untreated phosphogypsum contains large amounts of harmful impurities which can penetrate the land to pollute water,and uncontrolled emissions will cause serious environmental pollution. To comprehensive recycle and reuse of phosphogypsum is a serious problem of phosphorus chemical industry.The technology of decomposition phosphogypsum to make sulfuric acid and cement and to generate electricity was put,that is for some flaws with utilization of phosphogy-psum by new type dry process,such as easy to plug by crusting and the rotary kiln easy to clinker ring. The heating method that combined microwave reduction calciner with common electric resistance furnace to calcine phosphogypsum was Proposed and the result was good.In this paper, the dielectric constant of samples which are the mixture of phosphogypsum and anthracite has been tested,in frequency range 40Hz-110MHz and 50MHz-1GHz. At the same time, combined with the heating rates, concluded that the best ratio is 20%. The dielectric constant of products that are made by breaking down phosphogypsum in different temperatures, and combined with the data research of calcium sulfate dielectric properties change with temperature, there are two effect factors has been educed.①The dielectric properties of phosphogypsum has been mutated in 600～800℃;②In 600～800℃, calcium sulfide that was produced and it has a large dielectric constant. The new heating method that combined microwave reduction calciner with preheating furnace is mentioned and this method is making significant savings in energy consumption. Analysis of pressure and binder of PVA to the experimental data,and tested the permeability of the sample, in order to provide basic data of numerical simulation. Using the finite element software ANSYS simulated the distribution of electromagnetic field of rectangular cavity TE101 and cylindrical cavity TM010 and simulated the distribution of electromagnetic field of cylindrical cavity TM010 and microwave experiment which are with phosphogypsum in it. Meanwhile, with experiment study, electromagnetic field distribution of cavity was tested by starch. So the simulation results coincided with the experimental. In order to close the practical conditions of microwave ovens, in this paper, the electric field and absorption of power,the internal electromagnetic field distribution and resonant frequency, quality factor, energy consumption and other parameters of microwave resonant port cavity with media (water and phosphorus gypsum) were researched by experimental and theoretical study, and the results is good.