Abstract: The present invention provides an ore supply apparatus and an ore supply method which are capable of securing a stable ore-supply amount. The ore supply apparatus 20 according to the present invention includes a storage unit 21 configured to store an ore slurry, a piping unit 22 configured to discharge the ore slurry from the storage unit 21, a control valve provided to the piping unit 22 and configured to change the cross-sectional area of a flow path of the piping unit 22, and a buffer container 60 provided with an outlet 64 and configured to once accommodate the ore slurry discharged from the piping unit 22 and then supply said ore slurry into a concentrator from the outlet 64 at a predetermined flow rate.

Abstract: The present invention provides an ore supply apparatus and an ore supply method which are capable of securing a stable ore-supply amount. The ore supply apparatus according to the present invention includes a storage unit 21 configured to store an ore slurry, a piping unit 22 configured to discharge the ore slurry from the storage unit 21, a control valve 30 provided to the piping unit 22 and configured to change the cross-sectional area of a flow path of the piping unit 22 by changing the form of a tubular valve body 34 made of elastomer, and a sealing device 24 disposed inside the control valve 30 and configured to completely seal the flow path when the control valve 30 is adjusted so as to keep the cross-sectional area of the flow path to a minimum.

Abstract: The gold concentrate recovery system and a gold concentrate recovery method capable of recovering gold concentrates from gold ores with high efficiency and stability. The system and method include a shaking table 2 including a plurality of riffles 3 provided on an upper surface 2a. The riffles 3 include a plurality of first riffles 3a provided on the upper surface 2a of the shaking table 2, and at least a second riffle 3b disposed in a flat area 12 where the first riffles 3a are not provided.

Abstract: A water supply launder reducing imbalance of the flow amounts of the ore slurry and the additive water on the upper surface of the shaking table, and producing flow throughout the upper surface of the shaking table. The water supply launder included in a table gravity concentrator 1 to supply water to a table 2 of the table gravity concentrator 1 includes a launder body 20 which receives water supplied from a water supply unit 23 to an upper surface 21a of the launder body 20, and supplies the water to the table 2 of the table gravity concentrator 1, and a distribution member 30 which is attached to a lower surface 21b of the launder body 20, and contacts water dropping from the upper surface 21a of the launder body 20 and flowing to the table 2 of the table gravity concentrator 1 to distribute the water.

Abstract: There is provided a method for separating an arsenic mineral from a copper-bearing material containing arsenic, such as a copper ore or a copper concentrate, to obtain a copper concentrate with low arsenic grade. The method for separating an arsenic mineral from a copper-bearing material by flotation includes adding a flotation agent containing a depressant, a frother, and a collector to a slurry composed of a copper-bearing material containing arsenic, and blowing air into the slurry to float a copper concentrate, wherein the depressant is sodium thiosulfate. The sodium thiosulfate is preferably added in an amount of 10 kg or more and 200 kg or less in terms of sodium thiosulfate pentahydrate per ton of copper-bearing material to be subjected to flotation. Further, the oxidation-reduction potential of the slurry to be subjected to flotation, as measured against a silver/silver chloride reference electrode, is preferably ?10 mV or more and 50 mV or less.

Abstract: There is provided a method for separating an arsenic mineral from a copper-bearing material containing arsenic, such as a copper ore or a copper concentrate, to obtain a copper concentrate with low arsenic grade. The method for separating an arsenic mineral from a copper-bearing material by flotation includes adding a flotation agent containing a depressant, a frother, and a collector to a slurry composed of a copper-bearing material containing arsenic, and blowing air into the slurry to float a copper concentrate, wherein the depressant is sodium thiosulfate. The sodium thiosulfate is preferably added in an amount of 10 kg or more and 200 kg or less in terms of sodium thiosulfate pentahydrate per ton of copper-bearing material to be subjected to flotation. Further, the oxidation-reduction potential of the slurry to be subjected to flotation, as measured against a silver/silver chloride reference electrode, is preferably ?10 mV or more and 50 mV or less.