公开(公告)号：WO2022003747A1

公开(公告)日：2022-01-06

申请号：PCT/IT2021/050209

申请日：2021-07-05

Applicant: ECOTEC GESTIONE IMPIANTI S.R.L.

Inventor： IMERITO, Aldo ,  RAGONA, Mario ,  PISU, Massimo ,  AZARA, Pierandrea

IPC: C22B1/06 ,  C22B11/00 ,  C22B7/02 ,  C22B7/04 ,  C22B47/00 ,  C22B11/044

Abstract: Described is a process for the simultaneous treatment of residues of the non-ferrous metallurgical industry, in particular Waelz slag and residues deriving from thermal fuming processes of jarosite, goethite or KSS slag, comprising the following steps: - possible initial pre-treatment (A) of the material to be treated, to obtain homogeneous particle size characteristics; - thermal pre-treatment (B) by the addition of ammonium sulphate (or nitric acid and/or sulphuric acid mixed with ammonium sulphate or with another reagent capable of promoting a reaction with the Waelz slag which makes it possible to obtain firstly the formation of the reaction intermediate ammonium hydrogen sulphate, (NH4)HSC>4 and, subsequently and in sequence, the formation of soluble iron and manganese sulphates and the development of ammonia) and gradual increase in temperature from ambient temperature to a final temperature in the range 200 °C to 600 °C, in a neutral/oxidising environment, to obtain the conversion of the iron, and manganese if present in the material, into compounds such as iron sulphates, and, possibly, manganese sulphates, soluble in water, with the formation of ammonia; and - hydrometallurgical treatments (C), according to the following sub- steps: - addition of water and mixing, - correction of acidity up to a pH of 2 to 8 in an oxidising environment, to obtain the precipitation of the iron in the form of mixed oxyhydroxides. The invention also relates to the use of the precipitate thus obtained, after separating from the solution and purification, for the production of pigments based on iron oxide.

公开(公告)号：WO2022190153A1

公开(公告)日：2022-09-15

申请号：PCT/IT2022/050049

申请日：2022-03-10

Applicant: ECOTEC GESTIONE IMPIANTI S.R.L.

Inventor： IMERITO, Aldo ,  PISU, Massimo ,  RAGONA, Mario ,  AZARA, Pierandrea ,  MALAFRONTE, Francesca ,  CASULA, Arianna ,  MAMELI, Anna

IPC: C22B1/02 ,  C22B7/00 ,  C22B11/00 ,  C22B3/00 ,  C22B19/30

Abstract: The present invention concerns a method for the treatment of jarosite and other residues (1) of the zinc and lead production industry, including the following steps: thermal treatment (10) of the residues (1), at a temperature between 500 °C and 700 °C, to obtain the evaporation of the imbibition water and the demolition of the jarosite molecule, resulting in the development of SOa and in the removal of OH" groups to give additional water in the gaseous phase, and resulting in the obtainment, from the recondensation of these components, of an aqueous solution (12) of diluted sulfuric acid, and with the simultaneous formation of a solid fraction (11) composed of iron (111) oxide, zinc, lead, silver, copper sulphates and other minor elements; acid leaching (20) of said solid fraction (11) obtained from said thermal treatment step, by adding an acid leaching solution (19), to obtain an acid flow (21) containing a solution of zinc, copper and silver sulphates, and a solid fraction (22) enriched in iron oxides, lead sulphate and silver sulphate; saline leaching (30) of said solid fraction (22) obtained from said acid leaching step (20), to obtain a saline solution (31) containing lead and silver and a solid fraction (32) enriched in iron(lll) oxide and containing silica; refining treatment (40) of the saline solution (31) containing lead and silver obtained from said saline leaching step (30); and purification (50) of the silica of the solid fraction (32) enriched in iron (111) oxide and containing silica obtained from said saline leaching step (30), by using an acid solution, to obtain solubilization of iron(lll); separation of the solubilized iron(lll) from the silica, which remains insolubilized; precipitation of iron(lll) to obtain iron oxide pigment.

公开(公告)号：WO2014207778A1

公开(公告)日：2014-12-31

申请号：PCT/IT2014/000170

申请日：2014-06-25

Applicant: ECOTEC GESTIONE IMPIANTI S.R.L. ,  ECOTEC RISORSE S.R.L.

Inventor： IMERITO, Aldo ,  ORRU, Ricardo ,  RAGONA, Mario ,  PISU, Massimo ,  DENOTTI, Carla

IPC: C01G23/02 ,  C01B33/107 ,  C01G49/10 ,  C01B9/02 ,  C01F7/56 ,  C01F7/62 ,  C22B7/00

CPC classification number: C01F7/56 ,  C01B9/02 ,  C01B33/10721 ,  C01D3/04 ,  C01F7/066 ,  C01G15/00 ,  C01G23/022 ,  C01G23/024 ,  C01G49/10 ,  C01P2006/80 ,  C22B7/002 ,  Y02P10/212

Abstract: The subject of the invention is a process for the extraction, from bauxite, from red mud resulting from the processing of bauxite, and from chemically similar materials, of products of industrial interest, like sodium, iron, gallium, aluminum, titanium and silicon, separated from each other in chloride form. The process involves the melting of the to be treated material and the blowing in the melted bath of chlorine or chlorine in situ generating compounds, and the controlled cooling of the gaseous flow exiting from the melted bath for the selective condensation of chlorides of the elements of interest. The figure shows a block diagram of a particular embodiment wherein the melting is carried out in a transferred arc plasma reactor.

Abstract translation: 本发明的主题是从铝土矿从由铝土矿的加工产生的红泥和从化学上类似的材料中获得工业感兴趣的产品如钠，铁，镓，铝，钛和硅的方法， 以氯化物形式彼此分离。 该方法涉及待处理材料的熔化和在熔融的氯或氯原位产生化合物的熔池中的吹送，以及从熔融浴中排出的气流的受控冷却，以选择性地冷凝元素的氯化物 利益。 该图示出了特定实施例的框图，其中熔化在转移的电弧等离子体反应器中进行。