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1. 发明申请

WO2021237274A1 PROCESS FOR RECOVERING TITANIUM DIOXIDE 审中-公开
公开(公告)号：WO2021237274A1
公开(公告)日：2021-12-02
申请号：PCT/AU2021/050460
申请日：2021-05-18
申请人： COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION
发明人： DAS, Goutam, Kumar
IPC分类号： C22B34/12 , C22B3/10 , C22B3/22 , C01G23/053 , C01G23/047
摘要： A process for recovering titanium dioxide from a titanium-bearing material, the process including the steps of: leaching the titanium-bearing material in a first leaching step at atmospheric pressure and at a temperature of 70 to 97°C with a first lixiviant to produce a first leach solution comprising undissolved first leach solids that include a titanium content and a first leach liquor, the first lixiviant comprising hydrochloric acid at a concentration of less than 23 % w/w; separating the first leach liquor and the undissolved first leach solids; leaching the first leach solids in a second leaching step at atmospheric pressure and at a temperature of 60 to 80°C with a second lixiviant in the presence of a Fe powder reductant to produce a second leach solution comprising undissolved second leach solids and a second leach liquor that includes a leached titanium content and iron content, the second lixiviant comprising a mixed chloride solution comprising less than 23 % w/w hydrochloric acid and an additional chloride selected from alkali metal chlorides, magnesium chloride and calcium chloride, or mixtures thereof; separating the second leach liquor and the undissolved second leach solids; and thereafter separating the titanium dioxide and the iron content from the second leach liquor by precipitation, and regenerating the second lixiviant for recycle to the second leaching step.

2. 发明申请

WO2023056505A1 PROCESS FOR RECOVERING VALUE METALS FROM NICKEL AND COBALT BEARING LATERITIC ORE 审中-公开
公开(公告)号：WO2023056505A1
公开(公告)日：2023-04-13
申请号：PCT/AU2022/051179
申请日：2022-10-04
申请人： COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION
发明人： DAS, Goutam, Kumar
IPC分类号： C22B21/00 , C22B26/22 , C22B3/00 , C22B3/10 , C22B3/44 , C22B34/32 , C22B47/00
摘要： A process for recovering value metals from a nickel and cobalt bearing lateritic ore, the process including the steps of: leaching the nickel and cobalt bearing lateritic ore with a lixiviant comprising hydrochloric acid at a concentration of less than or equal to 25% w/w to produce a leach liquor and the undissolved leach solids; reduction of the leach liquor at 45 to 60 °C by the addition of metallic iron to produce a reduced liquor and a solid fraction comprising any unreacted solid iron powder; adding a neutralising agent to the reduced leach liquor thereby precipitating a nickel/cobalt/iron solid and forming a nickel/cobalt/ iron removed liquor; leaching the nickel/cobalt/iron containing solid with a lixiviant in at least one pH leaching step to produce a second leach solution comprising acid leach solids and an acid leach liquor that includes a nickel, cobalt and iron (II) content, adding an oxidant to the acid leach liquor thereby oxidising an iron (II) content to iron (III) in the acid leach liquor, to produce an oxidised acid leach liquor; adding a neutralising agent to the oxidised acid leach liquor thereby precipitating iron to produce an iron removed slurry; precipitating a mixed Ni/Co hydroxide from the iron removed liquor by adding a neutralising agent thereby producing a Ni/Co mixed hydroxide slurry including a mixed hydroxide solid precipitate and an Ni/Co removed liquor; and regenerating the lixiviant and recycling the lixiviant to the ore leaching step, wherein nickel and cobalt is recovered from the leach solution as a mixed Ni/Co hydroxide solid.

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