A vanadium pentoxide integrated drying, deammonification and oxidation melting tablet making system

Abstract

The patent of the present invention relates to the technical field of vanadium oxide tablet making, and discloses an integrated drying, deammonification, oxidation and melting tablet making system of vanadium pentoxide. It includes a drum dryer, a spray evaporator, a steam condensing device and a melting furnace. A screw feeder is connected to one side of the drum dryer, and a silo is arranged above the screw feeder. The top outlets of the drum dryer pass through The feeding pipeline and the high-temperature flue gas pipeline are connected to the melting furnace, the bottom outlet is connected to the bag filter and the spray evaporator in turn through the pipeline, and the top of the spray evaporator is connected to the steam condensing device through the pipeline. Connected to a pneumatic conveyor. The invention has low energy consumption, high vanadium recovery rate, short production cycle, and is environmentally friendly. By setting up a drum dryer and using high-temperature flue gas from a melting furnace as a drying heat source, the drying, deamination and melting in the production of vanadium extraction are treated separately, which is more efficient. It is conducive to safe, efficient and continuous production, and at the same time reduces waste of resources and environmental pollution.

Description

technical field [0001] The patent of the present invention relates to the technical field of vanadium oxide tablet making, in particular to an integrated drying, deammonification, oxidation and melting tablet making system of vanadium pentoxide. Background technique [0002] Vanadium is an important metal element, which is widely used in steel, chemical industry, construction and other fields. About 85% to 90% of vanadium is used in steel production in the form of vanadium pentoxide. It can not only refine the grain , but also improve the hardness and wear resistance of steel. At present, my country's industrialized production of vanadium pentoxide tablets generally adopts a one-step method of production. The process is: the cake-shaped ammonium polyvanadate with a water content of 30%-50% is obtained through hydrolysis, vanadium precipitation, and filtration, and is fed intermittently until it is melted. The furnace is heated with heavy oil or gas, and the furnace temperatu...

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Problems solved by technology

[0003] However, with the gradual increase in the demand for ferrovanadium, the country has higher and higher requirements for energy conservation and environmental protection. The existing one-step method not only has low production efficiency and vanadium recovery rate, but also high energy consumption. In addition, the ammonia gas produced directly emission, which seriously pollutes the environment. At the same time, since drying, deamination and melting are carried out in one furnace, the melting furnace must be cooled during feeding, which cannot realize continuous feeding and discharging, and the powdery vanadium pentoxide after drying It is easy to be blown away by the hot wind and enter the flue, and it will be discharged out of the furnace with the high-temperature flue gas before it is melted, and a large amount of high-temperature flue gas does not participate in heat exchange and directly enters the flue, resulting in a further decrease in vanadium recovery rate and heat utilization efficiency. The consumption increases, and the high-temperature flue gas (containing NH 3 and water vapor), cannot be effectively utilized, and most of them are directly discharged into the air, which aggravates energy waste and environmental pollution

In addition, the height of the hearth of the existing melting furnace is mostly fixed, and the materials are easy to accumulate during the melting process, which not only makes the materials heated unevenly and oxidizes slowly, but also the obtained melt cannot be transferred quickly and effectively, which greatly prolongs the production time. production cycle

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