Copper Recovery Rate Research Articles

Factors Governing Slag Cleaning in an Electric Furnace

Slags from the El Teniente Converter have high copper and magnetite contents. The reduction and copper impoverishment of these slags in an electric furnace were simulated in the laboratory as part of a conceptual study for the Las Ventanas Smelter of ENAMI. The effects of power input, electrode immersion, slag temperature and coke and solid revert additions on the rate of magnetite reduction and copper recovery were investigated. It was found that the rate of slag reduction is strongly dependent on electrode power density. The addition of solid reverts containing copper matte enhanced the recovery of copper. Magnetite stratification and a corresponding gradient in copper content occurred in the slag. The experimental results, combined with an analysis of the phenomena taking place in an electric furnace, led to an improved understanding of the slag cleaning mechanism and contributed to the successful start up of the slag cleaning electric furnace at the Las Ventanas Smelter.

Factors Governing Slag Cleaning in an Electric Furnace

Slags from the El Teniente Converter have high copper and magnetite contents. The reduction and copper impoverishment of these slags in an electric furnace were simulated in the laboratory as part of a conceptual study for the Las Ventanas Smelter of ENAMI. The effects of power input, electrode immersion, slag temperature and coke and solid revert additions on the rate of magnetite reduction and copper recovery were investigated. It was found that the rate of slag reduction is strongly dependent on electrode power density. The addition of solid reverts containing copper matte enhanced the recovery of copper. Magnetite stratification and a corresponding gradient in copper content occurred in the slag. The experimental results, combined with an analysis of the phenomena taking place in an electric furnace, led to an improved understanding of the slag cleaning mechanism and contributed to the successful start up of the slag cleaning electric furnace at the Las Ventanas Smelter.

リサイクリング シュレッダーダストからの金属回収技術

In Japan, disposed automobiles are generally shredded. The valuable metals are recovered from this shredded materials and then the shredder residue is landfilled. However, by the problem of the shortage of reclaimed lands and of the soil pollution caused by the metals in the residue, needs for the material recycling from shredder residue are highlighted. Shredder residue contains nonferrous metals such as copper, lead and zinc. In order to prevent environmental pollution, these nonferrous metals should be recovered from the thermal processed residue of shredder residue. Recovery of nonferrous metals in the incinerated residue of shredder residue has been investigated by Nippon mining & metals group. In Nikko Mikkaichi Recycle Co., Ltd., copper residue and lead slime have beenrecovered from the incinerated residue in the zinc smelting plant. Copper residue was charged in the converter of copper smelting plant and electrolytic copper was recovered in Saganoseki Smelter & Refinery. Simultaneously, lead slime was treated in the lead smelting plant and crude lead was recovered. The recovery rates of copper, lead and zinc from shredder residue are proximately 90%, 96 96, 74% in the investigation.Mitsubishi Materials Corporation has developed the recovery process of copper and lead by carbonizing shredder residue. The carbonized residue from the carbonization pilot plant of shredder residue was smelted and lead was efficiently recovered in crucible test. At the same time, the copper recovery process was investigated and the process by using conventional copper smelting plant was proposed. These processes are one of the effective methods to recover these metals.

Model for ferric sulfate leaching of copper ores containing a variety of sulfide minerals: Part I. Modeling uniform size ore fragments

A computer model was constructed for bacterial ferric sulfate leaching of the major sulfides found in porphyry copper deposits. Leaching occurs by reactions with ferric ion diffusing into the rock fragment. The model incorporates the reaction kinetics of the individual minerals and keeps material and energy balances. The model is needed to aid in the design of modifiedin situ leaching operations and combines desirable features found in previous models with extensions needed for the described study ofin situ leaching. In modeling the leaching of single ore fragments, it is shown that the rate of ferric ion generation by bacteria can limit the rate of copper recovery. The transition from kinetic to diffusion rate limitation is different for each mineral and ore fragment size. The width of the leaching reaction zone is different for each mineral, and many reaction zones cannot be considered narrow. Minerals do not leach in proportion to their concentration in ore fragments.

Site of Emetic Action of Oral Copper Sulfate in Dogs (II) Importance of Lower Duodenum

Sensitivities of the stomach and duodenum to oral copper sulfate emesis were compared in dogs. 1) Dogs equipped with a stainless steel cannula in the middle of the duodenum were challenged to the oral threshold emetic dose of copper sulfate administered by a gastric tube. When the cannulas were opened, the oral thresholds were not effective to elicit vomiting in the most cases (1/13). Fairly rapid and high rate recoveries of copper through the open cannula were noted. With the closed cannulas, the thresholds were highly effective (16/16). 2) In the dogs with a cannula at the upper part of the jejunum, the oral threshold doses were always effective whether the canula was opened (9/9) or closed (11/11). Recovery rates of copper from the cannula were usually poor. 3) The oral thresholds administered into the proximal end or the middle of the duodenum through a PVC tubing were equally effective. 4) Although copper sulfate might irritate the stomach and upper duodenum to evoke vomiting, these results suggested a higher sensitivity of the lower duodenum.