Microwave processing multi-phase fluidized bed reactor and process for treating phosphogypsum

Abstract

The invention discloses a microwave processing multi-phase fluidized bed reactor and a process for treating phosphogypsum, in the microwave processing multi-phase fluidized bed reactor, a reactor canbe heated divisionally, material flow fields in the reactor can be controlled, the reactor and microwave generators are separately arranged, the microwave processing multi-phase fluidized bed reactorcomprises the microwave-penetrable reactor and a microwave-reflecting shell sleeving the lower portion of the reactor, and the microwave generators, which are distributed from bottom to top and transmit microwave to a microwave-reflecting chamber, are arranged on the microwave-reflecting shell. The process for treating the phosphogypsum comprises the following steps: placing solid calcium sulfateparticles and liquid sulfur in a molar ratio of 1:1 to 1:10 in the reactor; heating the reactor through the microwave generators, controlling the pressure inside of the reactor to less than 1Mpa; andafter the reaction is completed, discharging a material. The microwave processing multi-phase fluidized bed reactor and the process for treating the phosphogypsum can enhance the heat and mass transfer efficiency among gas, liquid and solid three phases, reduce subsequent separation cost, save the process, and increase the chemical reaction rate.

Description

technical field [0001] The invention relates to a microwave-heated reactor and its application, in particular to a microwave-treated multiphase fluidized-bed reactor and a process for treating phosphogypsum with a microwave-treated multiphase fluidized-bed reactor. Background technique [0002] As we all know, chemical reactions often require heating or high temperature and high pressure. Traditional heating methods are based on heat conduction and heat convection. This method makes the reaction speed slower, and the selectivity and yield are not up to standard. Therefore, we are committed to speeding up the reaction rate, enhancing the yield, improving the selectivity, simplifying the post-treatment process, and improving the production efficiency of chemical reactions as a whole. [0003] Phosphogypsum, as an important renewable gypsum resource, is a solid waste discharged from the production of wet-process phosphoric acid. At present, the process of producing sulfuric ac...

AI Technical Summary

Problems solved by technology

Although the microwave fluidized bed high-pressure reactor solves the problem of fluidized bed high-pressure reaction, the control of local heating cannot be realized in the fluidized bed high-pressure reactor, and the gas cannot form a standardized flow field in the reactor.

At the same time, the waveguide is connected to the inner cavity of the reactor, so the waveguide will affect the reaction environment in the reactor. In order to avoid the influence of the waveguide on the reaction environment in the inner cavity of the reactor, an isolation mechanism is set up, which makes the structure more complicated.

Finally, the microwave is directly introduced into the reactor, so the heating of the reactor by the microwave is the overall heating, and it is impossible to realize local control and control the flow field of the gas by controlling the heating temperature

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