The present invention relates to a process for separating BaCl.sub.2 from a CaCl.sub.2 brine solution.

The present invention relates to a process for separating BaCl.sub.2 from a CaCl.sub.2 brine solution.

Methods for utilizing waste products of the steel industry are provided that utilize spent pickle liquor to recover valuable alkaline earth metals from low value wastes with significant calcium content in the form of insoluble oxide, hydroxides, and/or salts are provided, as well as methods for generating a ferric oxide hydroxide composite from steel slag. Suitable raw materials include slag from steel manufacturing and ash from various operations. Ferric oxide hydroxide composite materials described herein can be used for removal of sulfur and metals from contaminated materials. Accordingly, compositions and methods of the inventive concept introduce considerable value to low value waste materials that would otherwise be discarded. In addition, compositions and methods of the inventive concept serve to reduce waste streams from industrial processes.

Methods for utilizing waste products of the steel industry are provided that utilize spent pickle liquor to recover valuable alkaline earth metals from low value wastes with significant calcium content in the form of insoluble oxide, hydroxides, and/or salts are provided, as well as methods for generating a ferric oxide hydroxide composite from steel slag. Suitable raw materials include slag from steel manufacturing and ash from various operations. Ferric oxide hydroxide composite materials described herein can be used for removal of sulfur and metals from contaminated materials. Accordingly, compositions and methods of the inventive concept introduce considerable value to low value waste materials that would otherwise be discarded. In addition, compositions and methods of the inventive concept serve to reduce waste streams from industrial processes.

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 CaCl.sub.2 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.

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 CaCl.sub.2 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.

A method and system for independently sequestering liquid calcium chloride and pure solid sodium chloride from a solid salt waste mixture including calcium chloride, sodium chloride and impurities. In practice, the method includes a calcium chloride sequestration step, wherein the waste mixture is combined with water, maintaining the calcium chloride within the mixture at least 30% w/w, and the resulting liquid calcium chloride is decanted from such mixture. The remaining salt particulates may be depured by a depuration process, which may include the recycling of salt brine through the depuration process. Particulate impurities in the solid salt waste mixture may also be removed in practice of the methods of the disclosed technology, by means of one or more clarifiers.

A method and system for independently sequestering liquid calcium chloride and pure solid sodium chloride from a solid salt waste mixture including calcium chloride, sodium chloride and impurities. In practice, the method includes a calcium chloride sequestration step, wherein the waste mixture is combined with water, maintaining the calcium chloride within the mixture at least 30% w/w, and the resulting liquid calcium chloride is decanted from such mixture. The remaining salt particulates may be depured by a depuration process, which may include the recycling of salt brine through the depuration process. Particulate impurities in the solid salt waste mixture may also be removed in practice of the methods of the disclosed technology, by means of one or more clarifiers.

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 CaCl.sub.2 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.

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 CaCl.sub.2 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.