Methods for the separation and/or purification of metals
A method for separating at least two metals from each other in a metal refining process, the method comprising: injecting a feed solution comprising the metals into a column or flow pipe comprising a monolithic solid body having a plurality of channels; and flowing the feed solution through the plurality of channels in the monolithic solid body to separate the metals.
1 . A method for separating at least two metals from each other in a metal refining process, wherein the metals include at least one platinum group metal, the method comprising:
injecting a feed solution comprising the metals in HCl into a column or flow pipe comprising a monolithic solid body having a plurality of channels, wherein the monolithic solid body is a single, continuous, bonded, solid body comprising the plurality of channels through which the feed solution can flow; and
flowing the feed solution through the plurality of channels in the monolithic solid body to separate the metals,
wherein the method is a solid phase extraction method in which at least one metal species in the feed solution is adsorbed onto a surface of the monolithic solid body within the channels in order to separate the metals as the feed solution flows through the plurality of channels in the monolithic solid body,
wherein the surface of the monolithic solid body within the channels is functionalized to selectively adsorb one or more target metal containing species, and
further comprising eluting the feed from the monolithic solid body in an elution cycle by flowing an eluent through the monolithic solid body, wherein the eluent is HCl,
wherein the monolithic solid body is formed of an organic polymer material and the surface of the monolithic solid body within the channels is hydrophilic,
wherein the monolithic solid body comprises one or more of: a methacrylate; a thioether functionalised methacrylate; a glycol; an acrylate; a polystyrene divinyl benzene; a cross linked co-polymer of glycol methacrylate and ethylene glycol dimethacrylate; a co-polymer of oligo ethylene glycol, glycidyl methacrylate and ethylene glycol di-methacrylate; a polystyrene divinyl benzene polymer with hydrophilic oligo glycols groups covalently attached thereto, and
wherein the surface of the monolithic solid body within the channels comprises hydroxyl groups.
2 . The method according to claim 1 , wherein the monolithic solid body is formed by 3D printing.
3 . The method according to claim 1 , wherein each of the channels in the monolithic solid body has a diameter of 1 mm or more.
4 . The method according to claim 1 , wherein a concentration of the eluent is reduced during the elution cycle prior to elution of at least one of the metals.
5 . The method according to claim 1 , wherein a width of the monolithic body perpendicular to flow direction is between 0.1 m and 10 m and a length of the monolithic body parallel to flow direction is between 0.1 m and 10 m.