Slurry spray machine

摘要

A slurry spray machine for spraying a settable slurry includes a main passageway (104) configured for receiving a supply of pressurized slurry and having a supply end (108) and an outlet end (110) opposite the supply end (108). A first compressed gas inlet (116) is disposed intermediate the supply and outlet ends (108,110) and in fluid communication with the passageway (104) for introducing a first supply of pressurized gas into the slurry, and a second pressurized gas inlet (120) is disposed closer to the outlet (110) end than the first inlet (116) and in fluid communication with the passageway (104) for introducing a second supply of pressurized gas into the slurry. A pressurized supply of adjuvant is provided in fluid communication with the second pressurized gas inlet (120) for providing a blended gas to the second gas inlet (120). At least one valve is provided for controlling the flow of slurry through the passageway (104) and the flow of the first and second gases into the passageway (104). Prior to the pressurized ejection of the slurry from the outlet end (110), the first gas is injected into the slurry, and the blended gas is mixed with the slurry and the first pressurized gas between the first gas inlet (116) and the outlet end (110). <IMAGE>