METHOD, THE REACTOR AND THE INSTALLATION FOR THERMAL TREATMENT OF THE POWDERY MATERIAL Russian patent published in 2007 - IPC C01F7/44 F27B15/00 

FIELD: non-ferrous metallurgy; methods and devices for thermal treatment of the powdery materials.

SUBSTANCE: the invention is pertaining to the technology of reprocessing of the powdery materials, predominantly, the aluminum hydroxide. The method provides for: drying of the aluminum hydroxide by the ascending gases; the aluminum hydroxide cyclone separation; its preheating in the stream of the effluent gases; its feeding into the reaction chamber; the individual preparation of the mixture of the combustion products of the fuel and the air;

Baking of the aluminum hydroxide in the suspension state by the mixture of the fuel combustion products and the oxygen-containing gaseous phase; the cyclone separation of the aluminum oxide; the multi-stepwise cooling by the air with production of the commercial aluminum oxide. Baking of the aluminum hydroxide and the aluminum oxide cooling conduct in two stages. At that the baking at the initial stage conduct using the separately prepared mixture of the combustion products consisting of a part of the fuel and the consumable for the baking and used at the final stage of the aluminum oxide cooling; and the baking at the final stage is realized by the prepared directly in the reaction chamber mixture of the combustion products from the remained part of the fuel and the gaseous-powdery phase enriched with the air used at the initial stage of cooling of the aluminum oxide. The installation contains: the device for the aluminum hydroxide drying; the cyclone separator; the device for the preliminary direct-flow heating of the aluminum hydroxide; the reactor for the aluminum hydroxide baking, which is supplied with the air blower for the air feeding into the burners and contains the cylindrical reaction chamber with the conical bottom and the lower side holes for the material feeding, the lower central hole for the gaseous heat carrier feeding, the upper outlet opening for the gaseous-powdery mixture and the burner device located in the lower part of the reaction chamber and fulfilled in the form of the cylindrical prechamber supplied with the burners uniformly arranged on its surface and having the upper central outlet opening for the mixture of the combustion products and coupled with the lower central inlet opening of the reaction chamber. At that the prechamber is coaxially connected to the lower part of the reaction chamber; the cyclone separator of aluminum oxide, the multi-stepwise cyclone device for cooling the aluminum oxide, supplied with the blower for the air supply to the reactor; the smoke exhaust for removal of the effluent gases and connecting the pipe ducts. According to the invention the reaction chamber contains: the side radially mounted branch-pipes for the air arranged under the lower side inlet holes for the material; the burners radially mounted along the cylindrical surface of the middle part of the reaction chamber; the burners device has the lower tangential inlet branch-pipes for the air, and the prechamber burners are installed radially. The installation is additionally supplied with the device of cooling of the aluminum oxide and the blower for the air supply to the reactor connected with the cyclone separator of the aluminum oxide and with the inlet branch-pipe of the cyclone of the additional device of cooling, the outlet branch-pipe of which is connected with the lateral radially installed in the reaction chamber branch-pipes for the air. At that the inlet branch-pipe of the multi-stepwise device of cooling of the aluminum oxide is connected with the lower tangential branch-pipes for the air, and the inlet branch-pipe of the cyclone of the first step of the multi-stepwise device is connected to the pipe duct for feeding of the aluminum oxide from the additional device of cooling. The invention provides the improvement of the quality of the produced aluminum oxide and profitability of the production process.

EFFECT: the invention ensures the improvement of the quality of the produced aluminum oxide and profitability of the production process.

3 cl, 3 dwg, 1 tbl