A calcination unit able to decarbonate raw materials intended for clinker production, the unit including: a main duct in which the raw materials circulate according to a first movement direction, the raw materials being calcined in the main duct; a solid fuel supply duct opening onto the main duct via a fuel outlet, the solid fuel moving according to a second movement direction; a retaining device located in the main duct and arranged opposite the solid fuel outlet so that the solid fuel arriving in the main duct via the fuel outlet passes through the retaining device.

A calcination unit able to decarbonate raw materials intended for clinker production, the unit including: a main duct in which the raw materials circulate according to a first movement direction, the raw materials being calcined in the main duct; a solid fuel supply duct opening onto the main duct via a fuel outlet, the solid fuel moving according to a second movement direction; a retaining device located in the main duct and arranged opposite the solid fuel outlet so that the solid fuel arriving in the main duct via the fuel outlet passes through the retaining device.

A device and a method for producing high-purity nano molybdenum trioxide are provided. The device comprises a raw material bin (1), a feeding machine (2), a subliming furnace (7), a first vent tube (24), a second vent tube (25), a spraying device (23) and a filtering assembly. The sublimated molybdenum trioxide is cooled with clean and dehumidified air so as to finally obtain the nano molybdenum trioxide, and the recycling mode is reliable, pollution-free and high in efficiency.

A device and a method for producing high-purity nano molybdenum trioxide are provided. The device comprises a raw material bin (1), a feeding machine (2), a subliming furnace (7), a first vent tube (24), a second vent tube (25), a spraying device (23) and a filtering assembly. The sublimated molybdenum trioxide is cooled with clean and dehumidified air so as to finally obtain the nano molybdenum trioxide, and the recycling mode is reliable, pollution-free and high in efficiency.

The invention provides a method of reducing ferrous metal fines derived from waste or from ferrous ore, including feeding a fine ferrous material with a particle size distribution of between 10 microns to less than 6 mm and a reductant into an indirectly heated vibratory bed furnace, and contacting the fine ferrous material with the reductant in the indirectly heated vibratory bed furnace at a temperature of up to 1350 C. to produce a hot direct reduced ferrous metal.

The invention provides a method of reducing ferrous metal fines derived from waste or from ferrous ore, including feeding a fine ferrous material with a particle size distribution of between 10 microns to less than 6 mm and a reductant into an indirectly heated vibratory bed furnace, and contacting the fine ferrous material with the reductant in the indirectly heated vibratory bed furnace at a temperature of up to 1350 C. to produce a hot direct reduced ferrous metal.

A powder sintering system is disclosed. The powder sintering system includes a furnace body, at least one first dispersing device, at least one second dispersing device, a heating device, and a gas introducing device. The furnace body includes a bottom and a side wall defines a funnel shaped chamber. The at least one first dispersing device is located on the bottom of the furnace body, and disperses powder from the bottom of the furnace body to the side wall of the furnace body. The at least one second dispersing device is located on the side wall of the furnace body, and centrifugally disperse powder from the side wall of the furnace body to a center of the funnel shaped chamber. The heating device is located outside the furnace body. The gas introducing device supplies a protecting gas into the funnel shaped chamber.

Providing a cement production apparatus in which raw material is supplied into a duct with being dispersed uniformly so that heat-exchanging efficiency is improved by even preheating and clogging and the like are prevented, so that stable operation can be carried out. Between cyclones at an upper stage and a cyclone at a lower stage disposed below cyclones at an upper stage, a duct 21 is provided to introduce exhaust gas to the cyclones at the upper stage with distributing after flowing upward from the cyclone at the lower stage; at a lower position than a distribution part 23 of the duct 21, a material-supplying pipe 22 is connected for supplying cement raw material; at a connected part of the material-supplying pipe 22 to the duct 21, a material-guiding chute 24 on which the cement raw material is supplied from the material-supplying pipe 22 and which drops it into the duct 21 is provided with protruding into the duct 21; and the material-guiding chute 24 is formed to have a flat upper surface and to be expandable by sliding so that insertion depth of a tip end 24a from an inner-wall surface 21b of the duct 21 is 0.15 to 0.5 times of an inner diameter of the duct 21.