A method for recycling spent carbon cathode of aluminum electrolysis includes the following steps: (1) crushing and sieving spent carbon cathode, to obtain carbon particles; (2) mixing the carbon particles with a sulfuric acid solution, to obtain a slurry A, and then performing pressure leaching, to obtain a slurry B; (3) evaporating and concentrating the slurry B until a mass percentage of water is lower than 8%, to obtain a slurry C; (4) adding concentrated sulfuric acid to the slurry C to obtain a slurry D, then roasting the slurry D at 150-300° C. for 0.5-10 h, and then roasting at 300-600° C. for 0.5-8 h, to obtain the roasted carbon; and calcining the roasted carbon at a high temperature, to obtain the purified carbon, or mixing the roasted carbon with a leaching agent, and performing leaching, filtering, and washing, to obtain the purified carbon.

A method for recycling spent carbon cathode of aluminum electrolysis includes the following steps: (1) crushing and sieving spent carbon cathode, to obtain carbon particles; (2) mixing the carbon particles with a sulfuric acid solution, to obtain a slurry A, and then performing pressure leaching, to obtain a slurry B; (3) evaporating and concentrating the slurry B until a mass percentage of water is lower than 8%, to obtain a slurry C; (4) adding concentrated sulfuric acid to the slurry C to obtain a slurry D, then roasting the slurry D at 150-300° C. for 0.5-10 h, and then roasting at 300-600° C. for 0.5-8 h, to obtain the roasted carbon; and calcining the roasted carbon at a high temperature, to obtain the purified carbon, or mixing the roasted carbon with a leaching agent, and performing leaching, filtering, and washing, to obtain the purified carbon.

The invention provides novel remediants and methods for remediating all biological and synthetic fibers; and biological and synthetic membranes. The remediants comprise a chemically or biologically active or inactive material, in the form of particles which are on average less than the pore size of the selected fiber, or larger than the pore size of the selected membrane, and a polymeric elution supporter suspension which is interactive with an environmentally acceptable solvent. The elution support suspension mixture is capable of maintaining the particles in a persistent suspension which can permeate through the interwoven fiber layers and pores; or brush membrane surfaces and pores, due to it small or large size, thereby delivering the remediant to the desired fiber and membrane locations.

The invention provides novel remediants and methods for remediating all biological and synthetic fibers; and biological and synthetic membranes. The remediants comprise a chemically or biologically active or inactive material, in the form of particles which are on average less than the pore size of the selected fiber, or larger than the pore size of the selected membrane, and a polymeric elution supporter suspension which is interactive with an environmentally acceptable solvent. The elution support suspension mixture is capable of maintaining the particles in a persistent suspension which can permeate through the interwoven fiber layers and pores; or brush membrane surfaces and pores, due to it small or large size, thereby delivering the remediant to the desired fiber and membrane locations.

Chemical recycling facilities for processing mixed waste plastic are provided herein. Such facilities have the capability of processing mixed plastic waste streams and utilize a variety of recycling facilities, such as, for example, solvolysis facility, a pyrolysis facility, a cracker facility, a partial oxidation gasification facility, an energy recovery facility, and a solidification facility. Streams from one or more of these individual facilities may be used as feed to one or more of the other facilities, thereby maximizing recovery of valuable chemical components and minimizing unusable waste streams.

Chemical recycling facilities for processing mixed waste plastic are provided herein. Such facilities have the capability of processing mixed plastic waste streams and utilize a variety of recycling facilities, such as, for example, solvolysis facility, a pyrolysis facility, a cracker facility, a partial oxidation gasification facility, an energy recovery facility, and a solidification facility. Streams from one or more of these individual facilities may be used as feed to one or more of the other facilities, thereby maximizing recovery of valuable chemical components and minimizing unusable waste streams.

The present invention provides a method which is capable of more strictly controlling the oxygen partial pressure required during the melting of a starting material, thereby being capable of recovering a valuable metal more efficiently. A method for recovering valuable metals (Cu, Ni, Co), said method comprising the following steps: a step for preparing, as a starting material, a charge that contains at least phosphorus (P), manganese (Mn) and valuable metals; a step for heating and melting the starting material into a melt, and subsequently forming the melt into a molten material that contains an alloy and slag; and a step for recovering the alloy that contains valuable metals by separating the slag from the molten material. With respect to this method for recovering valuable metals, the oxygen partial pressure in the melt is directly measured with use of an oxygen analyzer when the starting material is heated and melted.

The present invention provides a method which is capable of more strictly controlling the oxygen partial pressure required during the melting of a starting material, thereby being capable of recovering a valuable metal more efficiently. A method for recovering valuable metals (Cu, Ni, Co), said method comprising the following steps: a step for preparing, as a starting material, a charge that contains at least phosphorus (P), iron (Fe) and valuable metals; a step for heating and melting the starting material into a melt, and subsequently forming the melt into a molten material that contains an alloy and slag; and a step for recovering the alloy that contains valuable metals by separating the slag from the molten material. With respect to this method for recovering valuable metals, the oxygen partial pressure in the melt is directly measured with use of an oxygen analyzer when the starting material is heated and melted.

A recovery method for a positive electrode active material includes: separating and recovering, from a positive electrode plate of a battery in which a positive electrode mixture containing a positive electrode active material is laminated on a positive electrode foil, the positive electrode mixture; supplying at least one of ozone and hydrogen peroxide to a slurry containing the positive electrode mixture to oxidize the positive electrode mixture; and separating and recovering the positive electrode active material from the slurry.

A recovery method for a positive electrode active material includes: separating and recovering, from a positive electrode plate of a battery in which a positive electrode mixture containing a positive electrode active material is laminated on a positive electrode foil, the positive electrode mixture; supplying at least one of ozone and hydrogen peroxide to a slurry containing the positive electrode mixture to oxidize the positive electrode mixture; and separating and recovering the positive electrode active material from the slurry.