Patent ID: 7891527

Claim:
An apparatus, the apparatus comprising: (a) a solids reservoir for holding a dry particulate solid; (b) a metering disc below the solids reservoir, wherein the metering disc rotates; (c) a first and second non-rotating component adjacent to the metering disc, wherein the first non-rotating component is below the metering disc and comprises a wear plate and wherein the second non-rotating component is above the metering disc and comprises a floating cover plate; (d) a cover plate and a plurality of springs, wherein the cover plate is located above the floating cover plate and the plurality of springs contact the cover plate and the floating cover plate (e) a surface of contact between the metering disc and at least one of the non-rotating components, wherein the surface of contact comprises a low friction material, wherein the low friction material comprises polytetrafluoroethylene and glass fibers, fillers of carbon, graphite, molybdenum disulphide, ceramic, or aramid fiber; (f) a drive shaft, wherein the drive shaft rotates the metering disc; (g) a drive motor for rotating the drive shaft; (h) a pickup section; and (i) an injection tube.