Abstract

The present invention relates to a process for the production of a LiHSO4 solution comprising the following steps: (a) providing a lithium solution comprising H+cations, Li+4 4 2-44 -244), and optionally water, to obtain the lithium solution; (b) optionally, removing insoluble impurities and/or organic impurities from the lithium solution; and (c) proceeding with nanofiltration (NF) of the lithium solution to obtain a lithium hydrogen sulphate solution. The present invention further relates to processes for the production of lithium sulphate solutions and/or lithium carbonate from the lithium sulphate solution.

IPC Classes  ?

• C22B 26/12 - Obtaining lithium
• C22B 1/00 - Preliminary treatment of ores or scrap
• B01D 61/02 - Reverse osmosisHyperfiltration
• C01D 15/06 - SulfatesSulfites
• C01D 15/08 - CarbonatesBicarbonates
• C22B 3/08 - Sulfuric acid
• C22B 3/22 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means
• C22B 7/00 - Working-up raw materials other than ores, e.g. scrap, to produce non-ferrous metals or compounds thereof
• H01M 10/54 - Reclaiming serviceable parts of waste accumulators
• B01D 61/14 - UltrafiltrationMicrofiltration
• B01D 61/58 - Multistep processes

Abstract

Process for the production of a purified phosphoric acid solution and/or dicalcium phosphate salts A process for the production of purified phosphoric acid solution (31,33) comprises the steps (a) of provision of a phosphate mineral source (1); (b) of acid attack of the phosphate mineral source by a concentrated strong acid aqueous solution (3) to obtain an attack mixture (5); (c) of dilution in water (7) of the attack mixture to obtain a monocalcium phosphate solution (11); (d) filtration (e) acidulation by a strong acid (19) to obtain a phosphoric acid solution (21); (f) optional pre-purification to obtain a pre-purified phosphoric acid solution (25) and (g) of separation through a membrane (29) of the phosphoric acid solution (21, 25) to recover a purified phosphoric acid solution (31), wherein the membrane (29) is selected from a diffusion dialysis acid separation membrane, an electrodialysis-driven depletion membrane or a nanofiltration membrane. The disclosure also relates to a process of production of a dicalcium phosphate salt (47, 49).

IPC Classes  ?

• C01B 25/223 - Preparation by reacting phosphate containing material with an acid, e.g. wet process with sulfuric acid, a mixture of acids mainly consisting of sulfuric acid or a mixture of compounds forming it in situ, e.g. a mixture of sulfur dioxide, water and oxygen only one form of calcium sulfate being formed
• C01B 25/232 - Preparation by reacting phosphate containing material with concentrated sulfuric acid and subsequently lixiviating the obtained mass, e.g. clincker process
• C01B 25/234 - PurificationStabilisationConcentration

Goods & Services

Chemicals for use in industry and science; Chemicals for use in agriculture; Chemicals used in horticulture; Chemicals used in forestry; Unprocessed resins; Unprocessed plastics; Food preservative compositions; Chemical additives for food; Additives (Chemical -) for use in the preparation of animal foodstuffs; Mixtures of chemicals and microorganisms for increasing the nutritional value of animal fodder [other than for veterinary use]; Phosphoric acid; Phosphates; Phosphates [fertilizers]; Fertilizers; Fertilizers for the land. Foodstuffs and fodder for animals; Agricultural and aquacultural crops, horticulture and forestry products. Treatment, processing and purification of organic substances; Treatment, processing and purification of organophosphorus compounds; Treatment, processing and purification of mineral salts; Treatment, processing and purification of phosphates; Energy production; Production of phosphoric acid; Waste water and sludge treatment using physical, chemical and/or biological processes; Professional consultancy and Technical consulting in relation to the following fields: Treatment, processing, purification and treatment of organic substances, organophosphorous compounds, mineral salts and phosphates, and Energy production and Treatment of sludge and wastewater. Scientific technological services; Industrial analysis and research services; Industrial analysis and research services in the field of chemistry; Software design and development; Chemical research laboratory services; Chemical research and analysis services; Biological research laboratory services; Services for assessing the efficiency of agricultural chemicals; Research relating to speciality chemicals; Technical consultancy in relation to research services relating to foods and dietary supplements; Technical consultancy relating to product development; Testing, authentication and quality control; Development and test of chemical production methods; Technical consultancy relating to product development, Namely expertise Development of chemicals, compounds and ingredients, in particular for producing pharmaceuticals and veterinary preparations, products for animal consumption, products for research and For scientific purposes; Scientific research relating to chemistry; Design of installations for the treatment, processing and purification of organic substances, organophosphorus compounds, mineral salts and phosphates; Information services relating to the safety of chemicals used in agriculture.