Various embodiments provide a process roasting a metal bearing material under oxidizing conditions to produce an oxidized metal bearing material, roasting the oxidized metal bearing material under reducing conditions to produce a roasted metal bearing material, and leaching the roasted metal bearing material in a basic medium to yield a pregnant leach solution.

A metal agglomerate production configuration including an induration apparatus configured to provide a metal oxide material manufacturing thermal process (MTE) including indurating a metal ore material into a metal oxide material and a method of production of metal agglomerates. A cooler device is configured for cooling the metal oxide material discharged from the induration apparatus and includes a first heat transferring arrangement configured for transferring a first heat energy content (HE) to the induration apparatus, which first heat energy content (HE) is recovered from the metal oxide material holding the thermal energy (TE). The configuration includes a second heat transferring arrangement configured for transferring a second heat energy content (HE) from the induration apparatus to the cooler device for cooling of the metal oxide material, which second heat energy content (HE) is recovered from the metal oxide material manufacturing thermal process (MTE).

A metal agglomerate production configuration including an induration apparatus configured to provide a metal oxide material manufacturing thermal process (MTE) including indurating a metal ore material into a metal oxide material and a method of production of metal agglomerates. A cooler device is configured for cooling the metal oxide material discharged from the induration apparatus and includes a first heat transferring arrangement configured for transferring a first heat energy content (HE) to the induration apparatus, which first heat energy content (HE) is recovered from the metal oxide material holding the thermal energy (TE). The configuration includes a second heat transferring arrangement configured for transferring a second heat energy content (HE) from the induration apparatus to the cooler device for cooling of the metal oxide material, which second heat energy content (HE) is recovered from the metal oxide material manufacturing thermal process (MTE).

The present disclosure provides a pre-reduced pellet preparation device and method based on grate-rotary kiln. The pre-reduced pellet preparation device comprises a grate-rotary kiln pellet oxidation system and a hydrogen-based shaft furnace reduction system. In the pre-reduced pellet preparation method, a roasting process and a reduction process for an iron-containing green pellet are organically combined, and a pellet cooling process after roasting and a heating process before pellet reduction are eliminated; physical heat of a roasted pellet is used to satisfy heat required in the heating and reduction processes; the technical problems of a low hydrogen utilization rate and high energy consumption of pellets in oxidative roasting and direct reduction processes in traditional direct reduction processes are solved; a reduced pellet having a certain metallization rate is obtained; the prepared pre-reduced pellet is used as blast furnace burden, such that blast furnace fuel consumption and carbon emission can be significantly reduced; the method is a new, low-carbon, and green pre-reduced pellet preparation process.

A supply chute, and a system and a method for supplying sinter material from a sinter belt to a sinter cooler (26). A flow of the sinter material (16) is input into the supply chute (1). The flow of sinter material (16) after being input is concentrated by a device in the chute. This means that the flow is remixed for more uniform grain size distribution. The flow is thereafter widened by a widening device in the chute. Then the widened flow of sinter material (16), optionally after making the movement direction of the flow of sinter material (16) uniform, the flow is passed through a segregation device (8,25) and is there segregated, which means that a grain size distribution across the thickness and across the width of the flow is made more uniform. This occurs after the widened flow of sinter material moves in the direction of the output region (5). After passing through the output region (5), the flow of sinter material (16) is supplied to the sinter cooler (26), wherein the horizontal main component B of the movement direction of the flow of sinter material is largely perpendicular to the horizontal main component A of the movement of sinter material by the sinter belt.

A supply chute, and a system and a method for supplying sinter material from a sinter belt to a sinter cooler (26). A flow of the sinter material (16) is input into the supply chute (1). The flow of sinter material (16) after being input is concentrated by a device in the chute. This means that the flow is remixed for more uniform grain size distribution. The flow is thereafter widened by a widening device in the chute. Then the widened flow of sinter material (16), optionally after making the movement direction of the flow of sinter material (16) uniform, the flow is passed through a segregation device (8,25) and is there segregated, which means that a grain size distribution across the thickness and across the width of the flow is made more uniform. This occurs after the widened flow of sinter material moves in the direction of the output region (5). After passing through the output region (5), the flow of sinter material (16) is supplied to the sinter cooler (26), wherein the horizontal main component B of the movement direction of the flow of sinter material is largely perpendicular to the horizontal main component A of the movement of sinter material by the sinter belt.

A cooling device (2; 50) for cooling bulk goods (4), which has a cooling shaft (8) and at least one supply chute (14) for introducing the bulk goods (4) into the cooling shaft (8). To achieve uniform cooling of the bulk goods (4), the supply chute (14) has a first wall (30) and a second wall (32) arranged opposite the first wall (30). At least part of the first wall (30) is arranged at a different angle of inclination (34) with respect to a vertical line (36) than the second wall (32).

A cooling device (2; 50) for cooling bulk goods (4), which has a cooling shaft (8) and at least one supply chute (14) for introducing the bulk goods (4) into the cooling shaft (8). To achieve uniform cooling of the bulk goods (4), the supply chute (14) has a first wall (30) and a second wall (32) arranged opposite the first wall (30). At least part of the first wall (30) is arranged at a different angle of inclination (34) with respect to a vertical line (36) than the second wall (32).

A method of recovering gold from refractory ore containing a carbonaceous material, a sulfide and gold is provided. Gypsum seed crystals are added to a slurry containing a roasted refractory ore or a pressure-oxidized refractory ore to decrease gypsum encapsulation of gold and improve gold recovery.

A method of recovering gold from refractory ore containing a carbonaceous material, a sulfide and gold is provided. Gypsum seed crystals are added to a slurry containing a roasted refractory ore or a pressure-oxidized refractory ore to decrease gypsum encapsulation of gold and improve gold recovery.