A system for processing a waste lithium-ion battery includes: a first aqueous solution generator that includes a first elution tank storing water, and that immerses an active material taken out from the waste lithium-ion battery in the water in the first elution tank and subjects the active material to carbon dioxide bubbling in the first elution tank to generate an aqueous solution of pH 5.5 to 8.5, in which lithium contained in the active material is eluted; a first solid-liquid separator that removes a solid component from the aqueous solution generated by the first aqueous solution generator; a first crystallizer that causes lithium carbonate to be deposited from the aqueous solution, from which the solid component has been removed by the first solid-liquid separator; and a second solid-liquid separator that performs solid-liquid separation on slurry containing the lithium carbonate deposited in the first crystallizer to take out the lithium carbonate.

The present invention relates to a novel chemical composition for removing oil from asphalt shingles. The composition preferably comprises approximately 48% water, 48% fuel such as gasoline or diesel, 2% alcohol, 1.5% citrus and 0.5% enzyme by weight. The composition is used in a system comprising a plurality of tanks that operate under a controlled heat and pressure to breakdown oil components within the shingles. The system uses a closed loop process to feed back the residual ingredients of the composition for reuse. Once through the system, the oil is removed from the asphalt shingles, thereby preventing oil from leeching into the groundwater when the asphalt shingles are disposed of.

Porous amorphous silica can be obtained from siliceous plant matter containing non-siliceous inorganic substances. The siliceous plant matter is soaked in an aqueous solution which includes a chelating agent. The chelating agent is present in an amount which helps to extract at least some of the non-siliceous inorganic matter. The aqueous solution is then separated from the siliceous plant matter. Beneficial properties are imparted to the siliceous plant matter by controlling the amount of at least one preselected non-siliceous inorganic substance in the siliceous plant matter. At the end of the process, the siliceous plant matter is heat treated in the presence of oxygen at a temperature to produce the resulting amorphous silica having the beneficial properties.

Provided is a method for recycling a water-absorbing resin which contains absorbed liquid, with consideration for a resource aspect and an energy aspect. The method for recycling a water-absorbing resin which contains absorbed liquid includes: discharging the absorbed liquid from the water-absorbing resin which contains the absorbed liquid; and recovering a water-absorbing power of the water-absorbing resin.

Provided is a method for recycling a water-absorbing resin which contains absorbed liquid, with consideration for a resource aspect and an energy aspect. The method for recycling a water-absorbing resin which contains absorbed liquid includes: discharging the absorbed liquid from the water-absorbing resin which contains the absorbed liquid; and recovering a water-absorbing power of the water-absorbing resin.

A method and device for extracting oil from food waste is disclosed. Food waste is introduced into an elongated cylinder that is immersed under hot water. A drive shaft is actuated that simultaneously presses the food waste against an interior wall and moves the food waste through the cylinder. The content of the cylinder is subjected to steam treatment using a steam inlet in the cylinder. The combination of hot water, steam treatment and pressing recovers a high content of oil from the food waste.

Disclosed is a method and a device for retrieving, from an object A, elements G present in a matrix M, the method including at least the following steps: bringing said abject A into contact with a dense fluid Fd with a molar mass greater than 2 g mol.sup.−1 under temperature T.sub.1 and pressure P.sub.1 conditions suitable for transforming the intergranular phase and for releasing the elements G, modifying the temperature T.sub.2 and/or pressure P.sub.2 values to stop the reaction transforming the intergranular phase, and recovering the elements G separated front the matrix M.

Disclosed is a method and a device for retrieving, from an object A, elements G present in a matrix M, the method including at least the following steps: bringing said abject A into contact with a dense fluid Fd with a molar mass greater than 2 g mol.sup.−1 under temperature T.sub.1 and pressure P.sub.1 conditions suitable for transforming the intergranular phase and for releasing the elements G, modifying the temperature T.sub.2 and/or pressure P.sub.2 values to stop the reaction transforming the intergranular phase, and recovering the elements G separated front the matrix M.

The method for separation of metals from electronic cards includes a step of processing the electronic cards in an aqueous medium under supercritical conditions. The method also a later step of crushing solid materials coming from the treatment under supercritical conditions.

A method for producing a mixed metal solution containing manganese ions and at least one of cobalt ions and nickel ions, the method including: an Al removal step of subjecting an acidic solution containing at least manganese ions and aluminum ions, and at least one of cobalt ions and nickel ions, to removal of the aluminum ions by extracting the aluminum ions into a solvent while leaving at least a part of the manganese ions in the acidic solution in an aqueous phase, the acidic solution being obtained by subjecting battery powder of lithium ion batteries to a leaching step; and a metal extraction step of bringing an extracted residual liquid obtained in the Al removal step to an equilibrium pH of 6.5 to 7.5 using a solvent containing a carboxylic acid-based extracting agent, extracting at least one of the manganese ions and at least one of the cobalt ions and the nickel ions into the solvent, and then back-extracting the manganese ions and at least one of the cobalt ions and nickel ions.