The present invention provides a lithium recycling method for waste lithium iron phosphate batteries, comprises: placing black powder of a positive electrode of a waste lithium iron phosphate battery in a roasting processing furnace filled with protective gas for a roasting reaction. During this, the input chlorine flow rate is adjusted based on the mixture in the roasting processing furnace to control the roasting reaction temperature at 50-300 C. The roasted product is then immersed in water to obtain a roasted product solution. Suction filtration of the roasted product solution yields a filtrate. Evaporation concentration followed by drying of the filtrate prepares lithium chloride crystals. This one-step low-temperature roasting, with temperature controlled by adjusting the input chlorine flow rate, converts the lithium element into water-soluble lithium chloride. The method is simple, efficient, low in energy consumption, achieves over 95% lithium element recycling rate, and has significant industrial application value.

The present invention provides a lithium recycling method for waste lithium iron phosphate batteries, comprises: placing black powder of a positive electrode of a waste lithium iron phosphate battery in a roasting processing furnace filled with protective gas for a roasting reaction. During this, the input chlorine flow rate is adjusted based on the mixture in the roasting processing furnace to control the roasting reaction temperature at 50-300 C. The roasted product is then immersed in water to obtain a roasted product solution. Suction filtration of the roasted product solution yields a filtrate. Evaporation concentration followed by drying of the filtrate prepares lithium chloride crystals. This one-step low-temperature roasting, with temperature controlled by adjusting the input chlorine flow rate, converts the lithium element into water-soluble lithium chloride. The method is simple, efficient, low in energy consumption, achieves over 95% lithium element recycling rate, and has significant industrial application value.

This disclosure relates to a process for selective extraction and separating vanadium and iron using a method of chlorinating vanadium-containing iron oxide ores. More particularly, the disclosure relates to a process for producing vanadium oxytrichloride (VOCl.sub.3) and iron trichloride (FeCl.sub.3) in a moving bed chlorinator by reacting chlorine and carbon monoxide with vanadium iron oxide materials. In addition, this disclosure describes removing other chlorides with the exemption of vanadium and iron chlorides from the exhaust stream from the reactor by creating a conversion temperature zone at the top of the reactor. Furthermore, the invention discloses removing impurities from an exhaust gas stream to purify carbon dioxide and it also includes a closed-loop capture in the process in order to convert carbon dioxide to carbon monoxide.

This disclosure relates to a process for selective extraction and separating vanadium and iron using a method of chlorinating vanadium-containing iron oxide ores. More particularly, the disclosure relates to a process for producing vanadium oxytrichloride (VOCl.sub.3) and iron trichloride (FeCl.sub.3) in a moving bed chlorinator by reacting chlorine and carbon monoxide with vanadium iron oxide materials. In addition, this disclosure describes removing other chlorides with the exemption of vanadium and iron chlorides from the exhaust stream from the reactor by creating a conversion temperature zone at the top of the reactor. Furthermore, the invention discloses removing impurities from an exhaust gas stream to purify carbon dioxide and it also includes a closed-loop capture in the process in order to convert carbon dioxide to carbon monoxide.

A comprehensive utilization method for valuable elements in hydrometallurgical slag of laterite nickel ore, comprising the following steps: S1. placing an iron-aluminum slag produced by laterite nickel ore hydrometallurgy in a tube furnace, and introducing an HCl gas stream for a one-stage distillation at 185-290 C. to obtain a one-stage distillation tail gas and a one-stage distillation residue; and condensing the one-stage distillation tail gas to obtain anhydrous AlCl.sub.3; S2. introducing an HCl gas stream to the one-stage distillation residue for a two-stage distillation at 320-500 C. to obtain a two-stage distillation tail gas and a two-stage distillation residue; and condensing the two-stage distillation tail gas to obtain anhydrous FeCl.sub.3; S3. subjecting the two-stage distillation residue to a leaching treatment by using a leaching solution to obtain a leaching residue and a leaching solution; subjecting the leaching solution to a scandium precipitation treatment to obtain a scandium precipitate and a de-scandiumed liquid; S4. adjusting the pH value of the de-scandiumed liquid to obtain an MHP. The obtained aluminum, iron, and scandium products have high purity and high recovery.