The present invention discloses a continuous calcination vessel which can be used to prepare calcined chemically-treated solid oxides from solid oxides and chemically-treated solid oxides. A process for the continuous preparation of calcined chemically-treated solid oxides is also provided. Calcined chemically-treated solid oxides disclosed herein can be used in catalyst compositions for the polymerization of olefins.

The present invention relates to a method for producing large-diameter, low-density carbon nanotubes. The method uses a catalyst containing spherical -alumina that is capable of controlling the growth of carbon nanotubes without deteriorating the quality of the carbon nanotubes. The use of the catalyst makes the carbon nanotubes highly dispersible.

The present disclosure relates to a method for chemically modifying particles of a bicarbonate salt in a co-rotating twin-screw extruder and chemically modified bicarbonate particles prepared therefrom. The present disclosure also relates to a method for controlling an amount of carbonate salt formed during chemical modification of bicarbonate salt particles.

The present invention discloses a continuous calcination vessel which can be used to prepare calcined chemically-treated solid oxides from solid oxides and chemically-treated solid oxides. A process for the continuous preparation of calcined chemically-treated solid oxides is also provided. Calcined chemically-treated solid oxides disclosed herein can be used in catalyst compositions for the polymerization of olefins.

Disclosed is a calcination apparatus, including: a calcination tube having open ends at both terminals; a pair of hoods, each hood covering each open end of the calcination tube; and a pair of rings, each ring sealing a gap between the calcination tube and the hood, wherein the rings are directly or indirectly fixed on an outer surface of the calcination tube; a groove is provided along a circumferential direction of the ring at a contact surface side between the ring and the hood; a sealed chamber surrounded by the hood and the groove is formed; and both the calcination tube and the rings rotate in a circumferential direction of the calcination tube while keeping the hood in contact with both sides of the groove.

A loop tower CO2 capture system includes a feeding unit, a carbonator, an accumulator, a calciner, a combustion chamber and a gas blower. The feeding unit has a first gas pipe. The carbonator includes multiple first cyclone dust collecting units. The first gas pipe has one end connected to the uppermost first cyclone dust collecting unit. The accumulator is connected to the lowermost first cyclone dust collecting unit, and is located between the carbonator and the calciner. The calciner includes multiple second cyclone dust collecting units. The accumulator is connected to the uppermost second cyclone dust collecting unit. The first gas pipe has the other end connected to the lowermost second cyclone dust collecting unit. The combustion chamber is connected to the lowermost second cyclone dust collecting unit. The gas blower is connected to the first gas pipe of the feeding unit.

A recirculated-suspension pre-calciner system is disclosed, comprising: a vortex cyclone dust collecting equipment including a plurality of devices, wherein a top device of the vortex cyclone dust collecting equipment is used as a feed system; a vertical combustion kiln; a blower; and a powder purge system, wherein powders in the feed system fall into the vortex cyclone dust collecting equipment and pass through a plurality of the devices to mix and exchange heat with flue gas comprising CO.sub.2, generating calcination reaction and releasing CO2 into the flue gas. and the steam is separated and transported to the feed system by the blower and acts as a carrier gas of powders.

A system to calcine crushed carbonate, discharge alkaline oxide, and deliver an enhancing fluid having CO2, comprising: a pressurized insulated calciner having descendingly, a crushed alkaline carbonate feeder, a calciner fluid outlet manifold, a heated sideflow calciner fluid intake manifold, a preheated sideflow calciner fluid outtake manifold, a fluid inlet manifold to recirculate calciner fluid from the outlet manifold, and an alkaline oxide discharger; a pressurizer to repressurize sideflow calciner fluid, connected to intake and outtake manifolds; pressurizers to recirculate calciner outlet fluid to the inlet manifold, pressurize the calciner and deliver enhancing fluid comprising CO2; delivery and combustion systems to form a combustion fluid; a recuperating or regenerating refractory heat exchanger to heat sideflow calciner fluid with combustion fluid connected to the sideflow pressurizer, and fluid outtake and intake manifolds; and a controller operable to control combustion, heat exchange, calciner fluid formation and delivery, carbonate feed and oxide discharge.

A system comprises a furnace, a fluidized bed assembly and a powder bed. The fluidized bed assembly is positioned in the furnace and comprises an outer chamber having an outer chamber inlet for receiving gas, an inner chamber positioned inside of the outer chamber. The inner chamber comprises an inner chamber inlet in fluid communication with the outer chamber, and an outlet through which the gas may exit the inner chamber and the outer chamber. The powder bed is disposed in the inner chamber.

An apparatus for calcining gypsum includes a housing, at least one burner assembly, and at least one baffle. The housing has opposite first and second lateral walls, an inlet, and an outlet. The at least one burner assembly is connected to the housing, and can include a burner, a fluidization plenum, and a serpentine burner conduit. The serpentine burner conduit at least partly extends through the housing and to the fluidization plenum. The at least one baffle is disposed in the housing and attached to one of the first and second lateral walls. The baffle extends at least partly across the housing toward the other of the first and second lateral walls to define a flow path for the gypsum. The flow path extends from the inlet, around the baffle, and to the outlet.