A process for manufacturing potassium sulfate fertilizer and other metal sulfates
A sulfate and alkaline earth metal technology, applied in the fields of alkali metal sulfite/sulfite, sulfate preparation, chemical instruments and methods, etc.
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Embodiment 1
[0052] A preferred embodiment of the invention introduces sulfur dioxide, air and water vapor gases at high temperatures, preferably in the range of 1000°F to 1150°F, in a series of shallow beds of a metal halide such as potassium chloride, 1 to 4 feet deep . The generation of sulfur dioxide is preferably carried out by combustion of elemental sulfur in air in a standard sulfur burner. Sufficient water for the reaction is sprayed as small droplets into the hot sulfur dioxide gas stream. The concentration and temperature of sulfur dioxide are controlled by adjusting the ratio of air to sulfur entering the burner. Commercial sulfur burners are capable of producing SO 2 SO content in the range of 5%-18% 2 gas. By controlling the excess of air, a gas with a higher temperature and a higher concentration can be obtained. SO 2 The higher the gas concentration is maintained, the higher the temperature of the gas and the faster the reaction rate. It is more desirable for the gas...
Embodiment 2
[0066] This example shows a variation of the inventive method, not the preferred method of the invention. The method uses the same raw materials and process equipment as before except that a catalyst is used to convert sulfur dioxide into more reactive sulfur trioxide. The catalyst used is LP-110 produced by MonsantoEnvirochem, which is mainly used in the production of sulfuric acid to convert SO 2 converted to SO 3 . This is a vanadium-based catalyst that is sensitive to temperature and humidity. The temperature is limited to 760°F, which requires a waste heat boiler or similar cooling device to reduce the temperature of SO entering the catalytic bed. 2 The gas is cooled. Because this catalytic transformation is an exothermic process, it usually takes place in two steps under a cooling medium. Because this catalyst is sensitive to moisture, the air involved in the combustion is pre-dried. Since water vapor is required for the final reaction, it is added after the cataly...
Embodiment 3
[0069] Another embodiment of the present invention is to introduce sulfuric acid vapor or atomized sulfuric acid into an alkali metal fluidized bed. Compared to the preferred embodiment of the invention, this method is significantly less energy efficient due to the heating of the fluidizing medium and acid. The heat released by sulfur combustion to produce sulfur dioxide or sulfur trioxide is wasted together in the process of generating sulfuric acid, just like the heat released from sulfur trioxide to sulfuric acid. And in order to carry out the subsequent reaction conversion process, it is necessary to provide heat equivalent to this. The only place where this method keeps the characteristics of the present invention in the embodiment is that it simply and effectively utilizes pure fluidization, keeps the original particle size and purity of the raw material, and utilizes the countercurrent method to improve the conversion percentage of halide to sulfate. Improve the purity...
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