2results about How to "Difficult to dissolve" patented technology

This application belongs to the field of waste lithium-ion battery recycling technology, specifically relating to a method for treating waste ternary lithium battery black powder based on pre-fixed fluoride treatment, including the following steps: S1, obtaining waste ternary lithium battery black powder and a fluoride-fixing agent as raw materials, wherein the fluoride-fixing agent consists of quicklime, sodium carbonate, and fly ash; adding the raw materials to water for stirring, a first reaction, and filtration to obtain a first solid residue; S2, calcining and cooling the first solid residue to obtain a second solid residue; S3, adding the second solid residue to water and introducing carbon dioxide for a second reaction, and filtration to obtain a lithium-containing solution and a fluorine-containing solid. This application achieves dual fluorine locking and efficient lithium recovery through the synergistic fluoride fixation of quicklime-sodium carbonate-fly ash and low-temperature calcination.

This invention proposes a method for preparing hydrothermal bricks using landfill humus and the resulting hydrothermal bricks. The method includes the following steps: Step 1: Mixing humus with sodium salt, calcining, crushing and grinding, adding acid for acid leaching, separating the solid and liquid, and drying the resulting solid to obtain a dry gel; Step 2: Adding NaOH solution to the dry gel for alkaline dissolution to obtain water glass; Step 3: Separately mixing humus, slag, lime, and water, then adding the water glass and mixing thoroughly to obtain a slurry; Step 4: Molding the slurry to obtain standard bricks, and subjecting the standard bricks to a hydrothermal reaction to obtain hydrothermal bricks. The hydrothermal bricks prepared by this method have excellent mechanical properties, are not prone to heavy metal leaching during long-term use, are simple and easy to operate, and are suitable for large-scale processing of landfill humus, thus effectively realizing the resource utilization of landfill humus and increasing its added economic value.