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1. 发明授权

US10370258B2 Method for complex treatment of phosphogypsum 有权
公开(公告)号：US10370258B2
公开(公告)日：2019-08-06
申请号：US15574902
申请日：2016-04-25
申请人： FERIN SP. Z O.O.
发明人： Wlodzimierz Merka
IPC分类号： C01F11/46 , C01B32/50 , C05C5/04 , C01F11/18 , C05D3/02 , C05D9/00 , C01B25/32 , C01B7/19 , C01C1/24 , C01F11/38
摘要： A method for complex treatment of phosphogypsum comprising crushing of phosphogypsum and its washing with a solution of sulphuric acid, concentration 2-15%, and stirring at 50-80□ C., wherein the resultant mixture is separated into a liquid fraction and a sediment containing mostly calcium sulphate, which is characterized in that metals are precipitated from the liquid fraction, mainly lanthanides, phosphates and sulphates of metals soluble in diluted sulphuric acid, and the sediment containing mostly calcium sulphate is converted in the presence of ammonia liquor and carbon dioxide to ammonium sulphate and calcium carbonate, wherein filtered and dried sediment of calcium carbonate is dissolved in a 15-30% solution of nitric acid while stirring continuously, and then the resultant CO2 is recirculated and used in the conversion of the first phase of the sediment, and the resultant mixture is separated into a solution of calcium nitrate with dissolved metals and a sediment of fluorides and silicates with metal precipitate.

2. 发明授权

US10919774B2 Method for the management of phosphogypsum 有权
公开(公告)号：US10919774B2
公开(公告)日：2021-02-16
申请号：US16603901
申请日：2017-09-14
申请人： FERIN SP. Z O.O.
发明人： Agata Toczek , Wlodzimierz Merka , Patryk Gosciniak , Maciej Gosciniak
IPC分类号： C01C1/24 , C01C1/26 , C01F11/36 , B01J19/00 , B01J19/10
摘要： A method for the management of phosphogypsum consists in that a reactor (2) is charged with apatite and/or phosphorite phosphogypsum and with an aqueous or ammoniacal solution of ammonium carbonate and/or bicarbonate from a pre-reactor (1), at 1: (0.1-4) ratio of phosphogypsum to the aqueous or ammoniacal solution of ammonium carbonate and/or bicarbonate, the entire contents are stirred at −10° C. to 200° C. for at least 2 minutes, CO2 being released in the course of the process is directed to the pre-reactor (1), and the post-reaction mixture is directed to a filter (3) to obtain an aqueous ammonium sulphate solution, whereas the precipitate from the filter (3) is heat-treated, followed by dissolving it in nitric acid in a reactor (5), and the resultant suspension is filtered through a filter (6) to obtain an aqueous calcium nitrate solution, and CO2 being released in the reactor (5) is recirculated to the pre-reactor (1) wherein CO2 is reacted with ammonia in an aqueous solution to obtain the aqueous or ammoniacal solution of carbonate and/or bicarbonate which is directed to the reactor (2), with the process for obtaining the aqueous or ammoniacal solution of ammonium carbonate and/or bicarbonate being conducted until the pH 7-12 of the solution is reached.

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