4results about How to "Shorten roasting time" patented technology

The present application relates to the field of energy-saving and environment-friendly production technology, in particular to a calcination method and system for flow-suspension roasting of petroleum coke. The method comprises: feeding petroleum coke raw materials into a multi-stage preheating system for countercurrent preheating; after preheating, the materials enter a flow-suspension roasting furnace to form a suspension state in a high-temperature airflow for rapid roasting; after roasting, the materials are separated from the flue gas, the separated flue gas containing volatile components is combusted in a combustion furnace and then subjected to purification treatment, and the heat is partially recycled; the separated high-temperature calcined coke is cooled through an air cooling and water cooling system and the heat is recovered, and the hot air generated by air cooling is recycled to the roasting furnace. The present application uses fluidization technology to shorten the roasting time to seconds, significantly improving the production efficiency; through multi-stage countercurrent heat exchange, flue gas combustion and heat recycling, the present application realizes heat cascade utilization and precise atmosphere control, greatly reduces energy consumption and oxidation loss, and stably controls the volatile component of the product below 1%, with high yield and uniform quality.

The present application belongs to the technical field of investment casting, and particularly relates to a manufacturing process of a impeller shell. The manufacturing process of the impeller shell comprises the following steps: 1) preparing a wax mold; 2) preparing a surface layer shell; 3) preparing a back layer shell; 4) sealing the shell with slurry; 5) dewaxing; and 6) baking. The manufacturing process of the impeller shell has the characteristics of short production cycle, low production cost, good shell removal, high finished product rate and the like, and improves the casting quality of the castings containing the impeller with a runner width less than 4 mm in the production of the casting industry.

A pressurized fluidized bed roasting system is disclosed, comprising a fluidized bed furnace tube and a pressurized roasting device. The fluidized bed furnace tube has a first fluidized gas inlet at its lower end and a first fluidized gas outlet at its upper end. The pressurized roasting device is arranged parallel to the fluidized bed furnace tube, and an opening communicating with the inner cavity of the pressurized roasting device is formed on the inner wall of the fluidized bed furnace tube, with a movable baffle at the opening. The pressurized roasting device has a second fluidized gas inlet at its lower end and a second fluidized gas outlet at its upper end. The pressurization method of the pressurized roasting device is to increase the gas flow rate or change the device volume. This pressurized fluidized bed roasting system provides preheating of materials in the fluidized bed furnace tube before feeding them into the pressurized roasting tube for pressurized roasting, shortening the roasting time, improving roasting efficiency and resource utilization, and solving the problem of long roasting times in conventional fluidized bed roasting processes.

A device and method for selective reduction and stepwise smelting of limonite laterite nickel ore to produce nickel-cobalt alloy and molten iron belong to the field of mineral processing and metallurgical technology. The device includes a silo, a screw feeder, a multi-stage cyclone preheating and drying system, a flue gas dust removal system, a fluidized bed roasting main furnace heating system, a first cyclone separator, a fluidized bed reduction reactor, a second cyclone separator, a first electric furnace smelting reactor, and a second electric furnace smelting reactor. The method steps are as follows: limonite laterite nickel ore is placed in the silo; it is fed into the multi-stage cyclone preheating and drying system, preheated, and then enters the roasting main furnace for heating, dehydration, and decomposition to form dried material; after gas-solid separation, the solid material enters the reduction reactor, and the high-temperature flue gas is returned to the system for preheating and drying; nitrogen and reducing gas are introduced into the inlet of the reduction reactor respectively, forming reduced material that flows out from the outlet; the solid material after gas-solid separation enters the smelting reactor, and excess gas is burned for heating; the iron-rich slag is melted and reduced, and then discharged after smelting.