Abstract: A method for chemical processing of sewage sludge ash comprises dissolving a start material, emanating from sewage sludge ash, in an acid comprising hydrochloric acid. The start material comprising at least silicon and iron compounds. Undissolved residues are separated, whereby a leachate remains. The amount of colloidal silica in the dissolved sewage sludge ash is controlled. At least one of iron and phosphorus is extracted from the leachate by liquid-liquid extraction with an organic solvent. At least a part of a raffinate at least partly depleted in at least one of iron and phosphorus originating from the step of extracting at least one of iron and phosphorus is recirculated for dissolving the start material, emanating from sewage sludge ash. The recirculated part of the raffinate at least partly depleted in at least one of iron and phosphorus comprises chloride ions.

Abstract: A method for recovery of commercial substances from apatite mineral comprises dissolving of apatite mineral in an acid comprising hydrochloride. The dissolution gives a first liquid solution comprising phosphate, calcium and chloride ions. The first liquid solution is treated into a second liquid solution comprising calcium and chloride ions. This treatment in turn comprises extracting of a major part of the phosphate ions with an organic solvent. A bleed solution is removed from the second solution. Solid gypsum comprising at least 70% in a di-hydrate crystal form is precipitated from the second solution. This precipitation of solid gypsum comprises adding the second solution and sulfuric acid simultaneously into a continuous-stirred reactor in the presence of gypsum crystals. Thereby, the precipitation of solid gypsum gives a third liquid solution comprising hydrochloride. An arrangement for recovery of commercial substances from apatite mineral is also presented.

Abstract: The present invention relates to a method for electrochemical purification of an aqueous solution comprising the steps of: providing a cathode and an anode to an aqueous solution, wherein said aqueous solution comprises soluble ions of at least one toxic heavy metal and wherein said cathode comprises an outer surface, which outer surface comprises a noble metal; applying an absolute potential to said cathode and wherein said absolute potential of said cathode drives the formation of an alloy comprising said noble metal and said at least one toxic heavy metal.

Abstract: A process for removal of aluminium and iron in the recycling of rechargeable batteries comprising providing a leachate from black mass, adding phosphoric acid (H3PO4) to said leachate and adjusting the pH to form iron phosphate (FePO4) and aluminium phosphate (AlPO4), precipitating and removing the formed FePO4 and AlPO4, and forming a filtrate for further recovery of cathode metals, mainly NMC-metals and lithium.

Abstract: A process for removal of aluminium and iron in the recycling of rechargeable batteries comprising providing a leachate from black mass, adding phosphoric acid (H3PO4) to said leachate and adjusting the pH to form iron phosphate (FePO4) and aluminium phosphate (AlPO4), precipitating and removing the formed FePO4 and AlPO4, and forming a filtrate for further recovery of cathode metals, mainly NMC-metals and lithium.

Abstract: A process for removal of aluminium and iron in the recycling of rechargeable batteries comprising providing a leachate from black mass, adding phosphoric acid (H3PO4) to said leachate and adjusting the pH to form iron phosphate (FePO4) and aluminium phosphate (AlPO4), precipitating and removing the formed FePO4 and AlPO4, and forming a filtrate for further recovery of cathode metals, mainly NMC-metals and lithium.

Abstract: The present invention relates to a method for electrochemical purification of an aqueous solution comprising the steps of: providing a cathode and an anode to an aqueous solution, wherein said aqueous solution comprises soluble ions of at least one toxic heavy metal and wherein said cathode comprises an outer surface, which outer surface comprises a noble metal; applying an absolute potential to said cathode and wherein said absolute potential of said cathode drives the formation of an alloy comprising said noble metal and said at least one toxic heavy metal.