4results about How to "Achieving selective leaching" patented technology

The invention relates to the technical field of lithium ion battery recovery, in particular to an electrochemical recovery method of a retired lithium iron phosphate battery, which comprises the following steps: preparing an electrode and constructing an electrolytic tank; performing an electrochemical leaching lithium extraction reaction and a circulating experiment; lithium precipitation and anode recovery; and regenerating the electrolyte. According to the method, the retired lithium iron phosphate battery electrode material is recycled by adopting an electrochemical selective leaching lithium extraction technology, the recovery rate of lithium can reach 89% or above, the recovery rate of iron phosphate can reach 90% or above, the regeneration rate of an anode side electrolyte and a cathode side electrolyte can reach 95% or above, and the selectivity of lithium leaching can reach 900 or above.

This invention discloses an ultrasonic-enhanced selective leaching method for the resource utilization of zinc-containing baghouse dust, belonging to the field of metallurgical dust and sludge comprehensive utilization technology. The method involves low-temperature calcination to activate the zinc-iron spinel structure, combined with a weakly acidic leachate for selective leaching of zinc under mild conditions, further enhanced by ultrasonic-enhanced mass transfer, significantly improving the leaching rate and selectivity of zinc. The leachate is purified to obtain nano-zinc oxide, and the leaching residue is co-sintered with high-silicon iron tailings to form glass-ceramic materials. This invention achieves efficient zinc recovery and full-component resource utilization of the residue, avoiding the use of strong acids and the problem of iron co-dissolution. It achieves high-value comprehensive utilization of valuable metals such as zinc and iron in baghouse dust under low-energy consumption and low-pollution conditions.

The invention discloses a method for selectively extracting lithium from clay type lithium ore through ferric sulfate roasting and water leaching, and belongs to the technical field of chemical engineering. The method comprises the following steps: uniformly mixing clay type lithium ore and ferric sulfate through fine grinding to obtain a mixture, and roasting the mixture to obtain roasted clinker; and adding water into the roasted clinker to carry out leaching reaction, and carrying out solid-liquid separation to obtain a lithium-containing leachate. When the method is used for leaching lithium, the leaching rate of lithium can reach 80% or above, the leaching rate of aluminum in the leachate is low, and selective leaching of lithium is achieved.

The invention discloses a method for enriching and selectively leaching scandium in weathering crust type scandium ore, which belongs to the technical field of physical separation and chemical industry, and comprises the following steps: carrying out crushing and magnetic separation on the weathering crust type scandium ore to obtain iron and titanium magnetic components and scandium-rich non-magnetic components; and mixing the scandium-rich non-magnetic component with ferric sulfate, roasting, and adding water into the roasted clinker for leaching reaction to obtain scandium-containing leachate. According to the method, scandium in the weathering crust type scandium ore can be effectively enriched and leached, good potential economic benefits are achieved, and a technical route is provided for comprehensive resource utilization of the weathering crust type scandium ore.