Uneven sintering is prevented in a sintering machine, and thus sintered ore having high strength and a high lump yield rate is manufactured. A method for manufacturing sintered ore comprising: charging sintering raw material comprising fine ore and carbon material on a circulatively moving pallet to form a raw material layer; igniting the carbon material on a surface of the raw material layer and sucking air from above the raw material layer down to below the palette so that the air is introduced into the raw material layer; and combusting the carbon material in the raw material layer to thereby manufacture sintered ore, wherein fuel gas is discharged from a nozzle at a flow speed of 40 Nm/s or more, the discharged fuel gas is combusted to generate combustion gas, and the combustion gas is used for the igniting the carbon material.

Uneven sintering is prevented in a sintering machine, and thus sintered ore having high strength and a high lump yield rate is manufactured. A method for manufacturing sintered ore comprising: charging sintering raw material comprising fine ore and carbon material on a circulatively moving pallet to form a raw material layer; igniting the carbon material on a surface of the raw material layer and sucking air from above the raw material layer down to below the palette so that the air is introduced into the raw material layer; and combusting the carbon material in the raw material layer to thereby manufacture sintered ore, wherein fuel gas is discharged from a nozzle at a flow speed of 40 Nm/s or more, the discharged fuel gas is combusted to generate combustion gas, and the combustion gas is used for the igniting the carbon material.

The present invention refers to an agglomeration drum and to a procedure for the agglomeration of mineral inside said drum for the pretreatment of minerals, both of them mainly used in hydrometallurgy. Said drum and procedure use a system and a phase of recirculation of gases as part of the invention. Additionally, in the agglomeration procedure the process of chemical reactions occurring inside the agglomeration drum is included. The agglomeration drum, agglomeration procedure and the reactive process allow to obtaining uniform, stable and poorly degradable agglomerates that have a bigger agglomerate-reagent contact surface. The agglomerates or aggregates produced in the agglomeration drum and according to the process of the invention increase the extractive yield of the later leaching process, thus reducing the creation of preferred ways for the leaching solution in the leaching piles. In addition, the drum and procedure of the invention allow preventing the release of gases to the environment, having a gas recirculation system, which by being closed keeps gases inside the agglomeration drum and process. This recirculation of gases not only allows preventing the release of said gases to the environment, but it also reduces the operating costs by using the recirculated gases as part of the agglomeration process.

The present invention refers to an agglomeration drum and to a procedure for the agglomeration of mineral inside said drum for the pretreatment of minerals, both of them mainly used in hydrometallurgy. Said drum and procedure use a system and a phase of recirculation of gases as part of the invention. Additionally, in the agglomeration procedure the process of chemical reactions occurring inside the agglomeration drum is included. The agglomeration drum, agglomeration procedure and the reactive process allow to obtaining uniform, stable and poorly degradable agglomerates that have a bigger agglomerate-reagent contact surface. The agglomerates or aggregates produced in the agglomeration drum and according to the process of the invention increase the extractive yield of the later leaching process, thus reducing the creation of preferred ways for the leaching solution in the leaching piles. In addition, the drum and procedure of the invention allow preventing the release of gases to the environment, having a gas recirculation system, which by being closed keeps gases inside the agglomeration drum and process. This recirculation of gases not only allows preventing the release of said gases to the environment, but it also reduces the operating costs by using the recirculated gases as part of the agglomeration process.

Microbial-assisted heap leaching of fragments or agglomerates of fragments of copper-containing sulfidic ores, such as chalcopyrite ores, and copper-containing sulfidic waste materials is disclosed. A heap leaching method includes controlling the sulfate concentration in a leach liquor. When heap leaching includes using agglomerates, a method of forming agglomerates includes adding the feed materials at, or close to, the inlet end, typically no more than 40%, typically no more than 30%, more typically no more than 20%, of the length from the inlet end of the agglomeration unit.

Microbial-assisted heap leaching of fragments or agglomerates of fragments of copper-containing sulfidic ores, such as chalcopyrite ores, and copper-containing sulfidic waste materials is disclosed. A heap leaching method includes controlling the sulfate concentration in a leach liquor. When heap leaching includes using agglomerates, a method of forming agglomerates includes adding the feed materials at, or close to, the inlet end, typically no more than 40%, typically no more than 30%, more typically no more than 20%, of the length from the inlet end of the agglomeration unit.

The present invention discloses a resource recovery method and a resource recovery system of desulfurized ash. The resource recovery method comprises: washing desulfurized ash with water, and performing solid-liquid separation to obtain solid residues rich in calcium sulfite and calcium sulfate and a solution rich in calcium hydroxide; preparing the solution into desulfurized slurry; and roasting the solid residues under the action of a reducing agent to obtain flue gas rich in sulfur dioxide and residues rich in calcium oxide. Therefore, the recovery of sulfur and calcium in the desulfurized ash is realized, and no solid waste, liquid waste, gas waste, etc. are produced in the process.

The present invention discloses a resource recovery method and a resource recovery system of desulfurized ash. The resource recovery method comprises: washing desulfurized ash with water, and performing solid-liquid separation to obtain solid residues rich in calcium sulfite and calcium sulfate and a solution rich in calcium hydroxide; preparing the solution into desulfurized slurry; and roasting the solid residues under the action of a reducing agent to obtain flue gas rich in sulfur dioxide and residues rich in calcium oxide. Therefore, the recovery of sulfur and calcium in the desulfurized ash is realized, and no solid waste, liquid waste, gas waste, etc. are produced in the process.

A thermal two-step process for producing ferronickel (FeNi) alloy particles from a nickel-containing sulfide material is provided. The process comprises heating a solid mixture comprising a nickel-containing sulfide material and an iron-containing material in agglomerated form, in an inert or reducing atmosphere to a heating temperature at which the solid mixture is partially molten and obtaining a hot mixture comprising a nickel-containing liquid phase, gangue, and FeNi alloy particles, and then controlled cooling of the hot mixture to increase the particle size and Ni content of said FeNi alloy particles and obtaining a processed material comprising said FeNi alloy particles having an increased particle size and an increased Ni content. Finally, the FeNi alloy particles are separated from the processed material. There is also provided FeNi alloy particles obtained from the process.

A thermal two-step process for producing ferronickel (FeNi) alloy particles from a nickel-containing sulfide material is provided. The process comprises heating a solid mixture comprising a nickel-containing sulfide material and an iron-containing material in agglomerated form, in an inert or reducing atmosphere to a heating temperature at which the solid mixture is partially molten and obtaining a hot mixture comprising a nickel-containing liquid phase, gangue, and FeNi alloy particles, and then controlled cooling of the hot mixture to increase the particle size and Ni content of said FeNi alloy particles and obtaining a processed material comprising said FeNi alloy particles having an increased particle size and an increased Ni content. Finally, the FeNi alloy particles are separated from the processed material. There is also provided FeNi alloy particles obtained from the process.