A method (10) for the processing of lithium containing brines, the method comprising the method steps of: (i) Passing a lithium containing brine (12) to a filtration step (14) to remove sulphates; (ii) Passing a product (16) of step (i) to a first ion exchange step (18) to remove divalent impurities; (iii) Passing a product (20) of step (ii) to a second ion exchange step (22) to remove boron impurities; (iv) Passing a product (24) of step (iii) to an electrolysis step (26) to produce lithium hydroxide (28); and (v) Passing a product (30) of step (iv) to a crystallisation step (32) that in turn provides a lithium hydroxide monohydrate product (34).

A method (10) for the processing of lithium containing brines, the method comprising the method steps of: (i) Passing a lithium containing brine (12) to a filtration step (14) to remove sulphates; (ii) Passing a product (16) of step (i) to a first ion exchange step (18) to remove divalent impurities; (iii) Passing a product (20) of step (ii) to a second ion exchange step (22) to remove boron impurities; (iv) Passing a product (24) of step (iii) to an electrolysis step (26) to produce lithium hydroxide (28); and (v) Passing a product (30) of step (iv) to a crystallisation step (32) that in turn provides a lithium hydroxide monohydrate product (34).

A resin for removing phosphorus from water body, and a preparation method therefor and an application thereof. The particle size of the resin is 0.5-0.8 mm; the resin has a porous structure, the specific surface area is 8-25 m.sup.2/g, and the pore size distribution is 3-15 nm, the wet apparent density is 0.68-0.74 g/cm.sup.3; the wet true density is 1.12-1.18 g/cm.sup.3: and the water content of the resin is 43-57% in percentage by weight. The resin is loaded with a functional group having a lanthanum-oxygen bond, so that the resin can selectively adsorb phosphate radicals in the water body. The resin can selectively remove phosphorus in the water body by using a mode of loading lanthanum on weak acid cation resin and utilizing high selectivity of the lanthanum-oxygen bond to phosphate radicals, is easy to resolve and low in synthesis cost, and can be repeatedly used. Phosphorus in eutrophicated water and waste water can be effectively removed, the content of phosphate radicals in the water body can be controlled within 20 ppm, the phosphorus removal cost of the water body is reduced and the resin has great advantages compared with conventional disposable phosphorus adsorbents.

A resin for removing phosphorus from water body, and a preparation method therefor and an application thereof. The particle size of the resin is 0.5-0.8 mm; the resin has a porous structure, the specific surface area is 8-25 m.sup.2/g, and the pore size distribution is 3-15 nm, the wet apparent density is 0.68-0.74 g/cm.sup.3; the wet true density is 1.12-1.18 g/cm.sup.3: and the water content of the resin is 43-57% in percentage by weight. The resin is loaded with a functional group having a lanthanum-oxygen bond, so that the resin can selectively adsorb phosphate radicals in the water body. The resin can selectively remove phosphorus in the water body by using a mode of loading lanthanum on weak acid cation resin and utilizing high selectivity of the lanthanum-oxygen bond to phosphate radicals, is easy to resolve and low in synthesis cost, and can be repeatedly used. Phosphorus in eutrophicated water and waste water can be effectively removed, the content of phosphate radicals in the water body can be controlled within 20 ppm, the phosphorus removal cost of the water body is reduced and the resin has great advantages compared with conventional disposable phosphorus adsorbents.

A cation exchange chromatographic matrix comprising a base material, and a copolymer with one monomer unit having at least a sulfonic acid group, the copolymer being immobilized on the base material, wherein: the copolymer forms substantially no cross-linked structure, and the copolymer comprises neither acrylamide nor an acrylamide derivative as a monomer unit, or comprises acrylamide or an acrylamide derivative as a monomer unit in a range which has no substantial influence; the ratio of the mass of the copolymer to the mass of the base material is 5% or more and 200% or less; and the density of the sulfonic acid group is higher than 30 mmol/L and 200 mmol/L or lower.

A cation exchange chromatographic matrix comprising a base material, and a copolymer with one monomer unit having at least a sulfonic acid group, the copolymer being immobilized on the base material, wherein: the copolymer forms substantially no cross-linked structure, and the copolymer comprises neither acrylamide nor an acrylamide derivative as a monomer unit, or comprises acrylamide or an acrylamide derivative as a monomer unit in a range which has no substantial influence; the ratio of the mass of the copolymer to the mass of the base material is 5% or more and 200% or less; and the density of the sulfonic acid group is higher than 30 mmol/L and 200 mmol/L or lower.

A filter includes a porous molding, the porous molding being a sintered product of mixed powder containing dry gel powder including an ion exchange resin and thermoplastic resin powder, or a swelled body of the sintered product. When water having an electric resistivity value of 18 MΩ.Math.cm or more is allowed to pass through a space velocity of 1200 hr−1, the electric resistivity value of water after passage is 15 MΩ.Math.cm or more.

To provide a filter that can efficiently remove metal ions in a solution to be treated, and easily acquire a solution having an extremely low content of metal ions.

An ion exchange chromatographic packing material is described that includes support resin particles and a copolymer grafted to the support resin particles. The copolymer includes polymerized functional monomers such as a first ion exchange group monomer and a second ion exchange group monomer. At a first pH, the first ion exchange group monomer is configured to have a first charge at a first pH, and the second ion exchange group monomer is configured to have a net neutral charge. At a second pH, the first ion exchange group monomer is configured to have the first charge at a second pH, and the second ion exchange group monomer is configured to have a second charge at the second pH where the first charge and second charge both have a same polarity.

An ion exchange chromatographic packing material is described that includes support resin particles and a copolymer grafted to the support resin particles. The copolymer includes polymerized functional monomers such as a first ion exchange group monomer and a second ion exchange group monomer. At a first pH, the first ion exchange group monomer is configured to have a first charge at a first pH, and the second ion exchange group monomer is configured to have a net neutral charge. At a second pH, the first ion exchange group monomer is configured to have the first charge at a second pH, and the second ion exchange group monomer is configured to have a second charge at the second pH where the first charge and second charge both have a same polarity.

Water softening system includes water softening tank, neutralization tank, electrolysis tank, and treatment tank. Water softening tank softens raw water containing a hardness component with weakly acidic cation exchange resin. Neutralization tank neutralizes a pH of soft water that has flowed through water softening tank with weakly basic anion exchange resin. Electrolysis tank generates acidic electrolyzed water for regenerating weakly acidic cation exchange resin of water softening tank and alkaline electrolyzed water for regenerating weakly basic anion exchange resin of neutralization tank. Treatment tank mixes the acidic electrolyzed water that has flowed through water softening tank and the alkaline electrolyzed water that has flowed through neutralization tank, and supplies the mixture of the acidic electrolyzed water and the alkaline electrolyzed water to electrolysis tank.