Method for dispersing gas in a solid-containing liquid, and an apparatus for it

A method for dispersing gas into small bubbles in a liquid in order to form a suspension of a gas, a liquid and a pulverous solid in the liquid and to produce a strong, suspension-maintaining flow field in a reaction chamber, comprising:

• introducing the gas into the bottom of a vessel, at the center, and directing the gas below the surface of a liquid which contains a pulverous solid towards the center of a horizontal, rotary, imperforate circular plate symmetrically positioned at the lower end of a rotating shaft which is suspended by its upper end, said circular plate being provided with vertical dispersing means attached to the edge of the circular plate, said vertical dispersing means being vertical dispersion blades parallel to the radius of the circular plate and located on the edges of the circular plate, whereby the gas spreads radially outwardly to form small bubbles, and a suspension of gas, liquid and solid is formed, said circular plate having attached arms and downwardly directed guiding means connected to said arms, said guiding means being baffle blades located outside the circular plate periphery and attached to the dispersion blades by arms on the plane of the circular plate, said gas being introduced by means of a gas-feeding conduit directed upwards from the reactor chamber bottom to below the circular plate at the center point of its cross-section, whereby the gas bubbles are further dispersed and said suspension is caused to change the direction of flow downwardly towards the bottom of the reaction chamber and then the direction of flow is again directed upwardly along the sides of the reaction chamber.