The present invention provides a system and method for preparing high-purity vanadium pentoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is subjected to purification by rectification, ammonium salt precipitation and fluidized calcination, thereby obtaining high-purity vanadium pentoxide, wherein the ammonia gas produced during calcination is condensed and then recycled for ammonium salt precipitation. The system and method have advantages of favorable adaptability to raw material, less pollution, low energy consumption in production, low operation cost, stable product quality, etc.

System and method for preparing high-purity vanadium pentoxide powder

The present invention provides a system and method for purifying and preparing vanadium pentoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is purified by rectification, and then subjected to fluidized gas phase ammonification, thereby obtaining ammonium metavanadate, and further obtaining a high-purity vanadium pentoxide powder product through fluidized calcination. The system and method have advantages of favorable adaptability to raw material, no discharge of contaminated wastewater, low energy consumption and chlorine consumption in production, stable product quality etc.

System and method for purifying and preparing high-purity vanadium pentoxide powder

The present invention provides a system and method for producing high-purity vanadium pentoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is purified by rectification, and then subjected to fluidized gas phase hydrolyzation and fluidized calcination, thereby producing a high-purity vanadium pentoxide product and a by-product of hydrochloric acid solution. The system and method have advantages of favorable adaptability to a raw material, no discharge of contaminated wastewater, low energy consumption in production and low operation cost, stable product quality and so on, and are suitable for large-scale industrial production of high-purity vanadium pentoxide powder with a purity of above 4N.

System and method for producing high-purity vanadium pentoxide powder

The invention discloses a double-flow-state clean combustion boiler and a double-flow-state clean combustion technology. The boiler comprises a bubbling fluidized bed and a circulating fluidized bed, wherein an overflow port and a first window are formed between a circulating fluidized bed firebox and a bubbling fluidized bed firebox; air distribution plates and primary air chambers are arranged at the bottoms of the circulating fluidized bed and the bubbling fluidized bed; a circulating fluidized bed smoke outlet is connected with a cyclone separator, a return feeder and a return leg in sequence, and then connected to the lower part of the circulating fluidized bed firebox and a tail flue connected with a smoke outlet of the cyclone separator; at least one set of bubbling fluidized bed is arranged on the side surface of the circulating fluidized bed firebox. Under a condition of using the same fuel particles, the clean combustion boiler can decompose and adjust the parameters that possibly conflict in the adjusting process of indexes, so that the indexes can be optimized to the utmost extent through adjustment of a single parameter or a few parameters (such as primary air volume, secondary air volume and oxygen content).

Double-flow-state clean combustion boiler and double-flow-state clean combustion technology

The present invention provides a system and method for producing high-purity vanadium tetraoxide powder. Industrial grade vanadium pentoxide is converted to vanadium oxytrichloride by low temperature fluidizing chlorination, wherein chlorinating gas is preheated via heat exchange between fluidizing gas and chlorination flue gas, and an appropriate amount of air is added to enable a part of carbon powder to combust so as to achieve a balanced heat supply during the chlorination, thereby increasing the efficiency of chlorination and ensuring good selectivity in low temperature chlorination. The vanadium oxytrichloride is purified by rectification, and then subjected to fluidized gas phase hydrolyzation, thereby producing a high-purity vanadium pentoxide product and a by-product solution of hydrochloric acid, and further obtaining a high-purity vanadium tetraoxide powder product through fluidized hydrogen reduction. The system and method have advantages of favorable adaptability to a raw material, no discharge of contaminated wastewater, low energy consumption and chlorine consumption in production, stable product quality and so on.

System and method for producing high-purity vanadium tetraoxide powder

A system and method for the fluidized direct reduction of iron ore concentrate powder. A two-phase fluidized bed is used for the direct reduction of iron ore concentrate powder. Each phase of the fluidized bed is formed by a bubbling bed and a circulating bed. Use of serial-connection processing involving gas and of high-gas-velocity processing of the circulating bed increase the gas utilization rate and the reduction efficiency of single-phase reduction. Once reduced gases are subjected to preheating, each gas is sent into an initial reduction phase and a final reduction phase so as to implement reduction of minerals. Use of mixed-connection processing involving gas appropriately reduces processing pressure. Hot flue gas produced by combustion in a gas heater is sent to a mineral pre-heating system that is used for pre-heating iron ore concentrate powder.

Wang Cunhu

Papers

System and method for preparing high-purity vanadium pentoxide powder

System and method for fluidized direct reduction of iron ore concentrate powder

System and method for purifying and preparing high-purity vanadium pentoxide powder

Iron ore powder fluidized reduction system and method

System and method for producing high-purity vanadium pentoxide powder