Metal recovery reactor and metal recovery system

Abstract

The present invention relates to a metal recovery reactor and a metal recovery system. The metal recovery device according to the present invention comprises an electrolytic cell which receives a solution containing metal ions from the outside, and which reduces and precipitates the metal ions of the solution on the surface of a cathode when the solution is supplied to a reaction space formed between an anode and the cathode surrounding the anode. The cathode comprises a main cathode and an auxiliary cathode positioned inside the main cathode and capable of being detached and attached from the main cathode.

What is claimed is: 
     
         1 . A reactor for recovering metal, comprising an electrolyzer that receives a water solution containing metal ions from the outside and reduces and extracts metal ions in the water solution on the surface of cathodes, when the water solution is supplied into a reaction space between an anode and the cathodes surrounding the anode,
 wherein the cathodes include a main cathode and a sub-cathode disposed inside the main cathode and separable from the main cathode.   
     
     
         2 . The reactor of  claim 1 , wherein the reduction and extraction of the metal ions occur on the inner side of the sub-cathode. 
     
     
         3 . The reactor of  claim 1 , wherein the main cathode has a ring shape and the sub-cathode has a plate shape and is wound inside the main cathode. 
     
     
         4 . The reactor of  claim 1 , wherein the sub-cathode is made of a material that is dissolved by acid that does not dissolve metal to be recovered. 
     
     
         5 . The reactor of  claim 1 , wherein the sub-cathode is in close contact with the main cathode and substantially fully covers the inner side of the main cathode. 
     
     
         6 . The reactor of  claim 1 , wherein the anode is formed in a bar shape and has a plurality of grooves on the outer side. 
     
     
         7 . The reactor of  claim 1 , wherein the anode is a hollow part with both ends open and the side of the anode is not open. 
     
     
         8 . The reactor of  claim 1 , wherein the ratio of the surface area of surface area/cathode of the anode in the reaction space is larger than 1. 
     
     
         9 . A system for recovering metal, comprising a reservoir that keeps a water solution containing metal ions; and an electrolyzer that receives the water solution from the outside and reduces and extracts metal ions in the water solution on the surface of cathodes, when the water solution is supplied into a reaction space between an anode and the cathodes surrounding the anode,
 wherein the cathodes include a main cathode and a sub-cathode disposed inside the main cathode and separable from the main cathode.   
     
     
         10 . The system of  claim 9 , wherein the sub-cathode substantially fully covers the inner side of the main cathode in close contact with the main cathode, and
 the reduction and extraction of the metal ions occur on the inner side of the sub-cathode.   
     
     
         11 . The reactor of  claim 9 , wherein the sub-cathode is made of a material that is dissolved by acid that does not dissolve metal to be recovered. 
     
     
         12 . The reactor of  claim 9 , wherein the anode is formed in a bar shape and has a plurality of grooves on the outer side. 
     
     
         13 . The reactor of  claim 9 , wherein the anode is a hollow part with both ends open and the side of the anode is not open. 
     
     
         14 . The reactor of  claim 9 , wherein the ratio of the surface area of surface area/cathode of the anode in the reaction space is larger than 1. 
     
     
         15 . The system of  claim 9 , further comprising a solid-liquid separator that receives a water solution discharged from the electrolyzer and separates metal particles. 
     
     
         16 . The system of  claim 15 , further comprising:
 an assistant tank that is disposed between the electrolyzer and the solid-liquid separator; and   a controller that reduces a water solution supplied to the electrolyzer when the level of the assistant tank is a first level or more, and that reduces the water solution supplied to the solid-liquid separator when the level of the assistant tank is a second level, which is smaller than the first level, or less.