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US 10,773,971 B2Granted
Method and arrangement for recovery of salt
AssigneeEasymining Sweden AB
InventorYariv Cohen
Life of this patent
Estimating the term…
Abstract
A method for recovery of salts comprises providing (210) of an initial aqueous solution comprising ions of Na, K, Cl and optionally Ca or a material which when brought in contact with water forms an initial aqueous solution comprising ions of Na, K, Cl and optionally Ca. The start material is treated (230) into an enriched aqueous solution having a concentration of CaCl2 of at least 15% by weight. The treatment (230) comprises at least one of reduction of water content and addition of Ca. The treatment (230) generates a solid mix of Na Cl and KCl. The solid mix of NaCl and KCl is separated (235) from the enriched aqueous solution, giving a depleted aqueous solution comprising ions of Ca and Cl as main dissolved substances. An arrangement for recovery of salts is also disclosed.
Claims20
A method for recovery of salts, comprising the steps of:
- providing a start material, which when brought in contact with water forms an initial aqueous solution comprising ions of Na, K, Cl and optionally Ca;
- treating said start material into an enriched aqueous solution having a concentration of CaCl2 of at least 15% by weight;
- said treating optionally comprising reduction of water content;
- and
- said step of treating generating a solid mix of NaCl and KCl;
- said treating comprising controlled provision of at least additional ions of Ca into said enriched aqueous solution in excess of what a said initial aqueous solution can provide;
- and
- separating said solid mix of NaCl and KCl from said enriched aqueous solution, giving a depleted aqueous solution comprising ions of Ca and Cl as main dissolved substances;
- adding said solid mix of said NaCl and KCl into an aqueous solution, thereby dissolving at least a part of said solid mix of said KCl and NaCl, to form a mixed aqueous solution;
- said step of adding said solid mix of said NaCl and KCl into said aqueous solution comprises controlled dissolving said KCl and optionally a part of said NaCl in said aqueous solution at a first temperature to obtain a first concentration of KCl;
- said first concentration of KCl being lower than a solubility concentration of KCl at said first temperature;
- and
- separating said NaCl and KCl into individual fractions from said mixed aqueous solution;
- said step of separating said NaCl and KCl into individual fractions in turn comprises the steps of:
- separating any solid NaCl from said mixed aqueous solution at said first temperature;
- lowering, after said step of separating any solid NaCl, a temperature of said mixed aqueous solution to a second temperature lower than said first temperature;
- and
- separating any precipitated KCl from said mixed aqueous solution at said second temperature;
- and by the further step of
- heating and recycling, after said separating of said any precipitated KCl, at least a part of said mixed aqueous solution for a further said adding of said solid mix of said NaCl and KCl.
17 more elements
An arrangement for recovery of salts, comprising:
- an input section;
- and
- a first stage section, comprising a treatment arrangement and a salt mix separator;
- said input section being arranged for providing a start material comprising at least one of an initial aqueous solution comprising ions of Na, K, Cl and optionally Ca, and a material, which when brought in contact with water forms an initial aqueous solution comprising ions of Na, K, Cl and optionally Ca to said first stage section;
- said treatment arrangement being arranged for treating said start material provided from said input section into an enriched aqueous solution having a concentration of CaCl2 of at least 15% by weight, whereby a solid mix of NaCl and KCl is generated;
- said treatment arrangement optionally comprising a water reduction arrangement;
- said water reduction arrangement being arranged for removing water from said initial aqueous solution;
- said salt mix separator being arranged for separating said solid mix of said NaCl and KCl from said enriched aqueous solution, giving a depleted aqueous solution comprising ions of Ca and Cl as main dissolved substances;
- said treatment arrangement comprises an input for additives;
- said input for additives being arranged for controlled provision of at least additional ions of Ca into said initial aqueous solution;
- a second stage section connected to said first stage section for enabling transferring of said solid mix of said NaCl and KCl, said second stage section comprising:
- a dissolver, arranged for adding said solid mix of said NaCl and KCl into an aqueous solution, thereby dissolving at least a part of said solid mix of said KCl and NaCl, to form a mixed aqueous solution;
- said dissolver is arranged for controlled dissolving said KCl and optionally a part of said NaCl in said aqueous solution at a first temperature to obtain a first concentration of KCl;
- said first concentration of KCl being lower than a solubility concentration of KCl at said first temperature;
- and
- a separator arrangement, arranged for separating said NaCl and KCl into individual fractions from said mixed aqueous solution
- said separator arrangement comprises:
- a NaCl separator for separating any solid NaCl from said mixed aqueous solution at said first temperature;
- a temperature controller for lowering, downstream of said NaCl separator, a temperature of said mixed aqueous solution to a second temperature, said second temperature being lower than said first temperature;
- and
- a KCl separator for separating any precipitated KCl from said mixed aqueous solution at said second temperature;
- and by further comprising
- a NaCl/KCl recycling arrangement;
- said NaCl/KCl recycling arrangement being arranged for heating and recycling, downstream of said KCl separator, at least a part of said mixed aqueous solution to said dissolver.
21 more elements
Dependencies are inferred from the claim text.