A solid material mixer for mixing two or more solid materials does not require the use of external power sources and moving parts. The mixer includes at least a first chamber or tank, at least one second chamber or tank, one or more main valves and one or more mixing and homogenizing zones. The device is used in a mixing method.

A weigh hopper assembly including a plurality of adjacently aligned weigh hoppers connected via a frame, and longitudinal conveyor mechanism extending along a top portion of the weigh hopper assembly. Each weigh hopper has independent load cells in order to individually weigh the material discharged into the weigh hopper. The conveyor mechanism includes a plurality of gates along a bottom surface of the conveyor mechanism, each gate being aligned with a corresponding weigh hopper of the plurality of weigh hoppers. The conveyor mechanism is in turn connected to a plurality of product bins. A top portion of the conveyor mechanism is in communication with a plurality of product bins via a series of inlet chutes and gates. The weigh hoppers are aligned adjacent to each other and spaced so that each weigh hopper aligns with the transport vehicle.

A weigh hopper assembly including a plurality of adjacently aligned weigh hoppers connected via a frame, and longitudinal conveyor mechanism extending along a top portion of the weigh hopper assembly. Each weigh hopper has independent load cells in order to individually weigh the material discharged into the weigh hopper. The conveyor mechanism includes a plurality of gates along a bottom surface of the conveyor mechanism, each gate being aligned with a corresponding weigh hopper of the plurality of weigh hoppers. The conveyor mechanism is in turn connected to a plurality of product bins. A top portion of the conveyor mechanism is in communication with a plurality of product bins via a series of inlet chutes and gates. The weigh hoppers are aligned adjacent to each other and spaced so that each weigh hopper aligns with the transport vehicle.

Segregation of silicon granules in the fluidized bed production of polycrystalline silicon is achieved by successively transferring granular polycrystalline silicon through a plurality of vessels designed for funnel flow of granular material. The transfers may occur prior to introduction of feed particles into the reactor, or the enlarged granules from the reactor may be thus transferred to improve product size uniformity.