公开(公告)号：WO2022115021A1

公开(公告)日：2022-06-02

申请号：PCT/SE2021/051165

申请日：2021-11-23

Applicant: EASYMINING SWEDEN AB

Inventor： COHEN, Yariv ,  VAN DER WERF, Angela ,  WESTLUND, Viktoria ,  TUNSU, Cristian ,  ROYEN, Hugo

IPC: C01B25/22 ,  C01F11/46

Abstract: A method for recovery of commercial substances from apatite mineral comprises dissolving (S10) 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 (S20) into a second liquid solution comprising calcium and chloride ions. This treatment in turn comprises extracting (S22) of a major part of the phosphate ions with an organic solvent. A bleed solution is removed (S30) from the second solution. Solid gypsum comprising at least 70% in a di-hydrate crystal form is precipitated (S40) from the second solution. This precipitation of solid gypsum comprises adding (S42) 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.

公开(公告)号：WO2022173349A1

公开(公告)日：2022-08-18

申请号：PCT/SE2022/050132

申请日：2022-02-08

Applicant: EASYMINING SWEDEN AB

Inventor： TUNSU, Cristian ,  VAN DER WERF, Angela ,  ROYEN, Hugo ,  COHEN, Yariv ,  SVÄRD, John

IPC: C01B25/22 ,  B09B3/00 ,  C01B25/46 ,  C01G49/00 ,  C02F11/00 ,  C05B11/12 ,  C05F7/00

Abstract: A method for chemical processing of sewage sludge ash comprises dissolving (S10) 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 (S12), whereby a leachate remains. The amount of colloidal silica in the dissolved sewage sludge ash is controlled (S15). At least one of iron and phosphorus is extracted (20) 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 (S90) 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. An arrangement for chemical processing of sewage sludge ash is also disclosed.