METHOD OF MATERIAL PREPARATION FOR SEMIDRY PRESSING AND DEVICE FOR ITS REALISATION Russian patent published in 2015 - IPC B02C23/00 B28C1/00 C04B33/02 

FIELD: construction.

SUBSTANCE: method of material preparation for semidry pressing includes supply of material for processing, its mixing and grinding and subsequent discharge of processed material. At the same time fine fractions of material are coated by dispersed particles of this material. For this purpose they are additionally mixed both during grinding, when rotary motion is performed around vertical axis in high-seed mode, and afterwards, performing rotaty motion also around the vertical axis, but in low-speed mode. Such actions and modes of material processing increase quality of material ready for semidry dressing and its size composition, which improves mechanical and colour properties of construction products manufactured from it. The device for method realisation comprises a body, where the following components are arranged one under the other: a mixing chamber and a grinding and mixing chamber, each having an autonomous drive, and also charging and discharging nozzles, each with a gate connected to a control unit. Nozzles are located at the top and at the bottom of the mixing chamber. Working elements in the chambers are arranged in the form of blades with the possibility of rotation around the vertical axis. In the mixing chamber compared to the mixing and grinding chamber the volume is less, the high-speed drive and the vertical axis are displaced along the horizontal line to the side opposite to displacement of the discharging nozzle from the vertical axis of the mixing chamber. A joint hole between both chambers is arranged with appropriate displacement from the vertical axis of the upper chamber. Besides, the high-speed drive is located in a body under the bottom of the grinding and mixing chamber, and the low-speed one - on top of the mixing chamber and outside the body. Longitudinal axes of the blades of the mixing chamber are directed in different directions, and grinding and mixing chambers - in horizontal direction.

EFFECT: reduced dimensions and increased efficiency of device operation.