Improved process for hydrothermal production of potassium...

Details Improved process for hydrothermal production of potassium... Improved process for hydrothermal production of potassium...

C - Chemistry, Metallurgy

01

B

6/226

C01B 33/32 (2006.01)

Patent

CA 2009038

The direct hydrothermal production of high purity potassium silicate solutions having a high SiO2 : K2O molar ratio by reaction of a silicon dioxide source with aqueous potassium hydroxide solutions is made possible by using a silicon dioxide source that contains a sufficient fraction of cristobalite phase, or by conditioning other crystalline forms of silicon dioxide by heating at or above 1100° C, but below the melting point of silica, before the hydrothermal treatment. Preferably the potassium hydroxide solution has a concentration range of 10 to 40% by weight, and the reaction is carried out in a closed pressure reactor at temperatures of 150 to 300°C and under saturated steam pressures corresponding to those temperatures.

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