Process for the preparation of alkyl or alkaline earth ferrates by the solid phase.

摘要

To prepare a potassium ferrate, 100 parts of ferrous sulphate heptahydrate and 68 parts of calcium hypochlorite with a chlorimeter value of 210 degrees are ground intimately to obtain a powder which passes through a 500- mu m mesh. This powder is formed into a layer onto which are scattered 100 parts of potassium hydroxide pellets containing 15% by weight of water. The whole is vibrated for 10 to 60 minutes, depending on atmospheric moisture content, while care is taken that the temperature does not exceed 40<o>C. The unreacted powder is removed by screening through a 1-mm mesh and the pellets are stoved at 120<o>C for 12 hours. The pellets are washed with methyl alcohol to remove most of the remaining potassium hydroxide and potassium chloride and carbonate as well as calcium chloride. The ferrate obtained, purple in colour, is stable in a closed vessel.