Disclosed is a limestone slurry and lime milk preparing device for hydrometallurgy of laterite nickel ore, comprising a limestone slurry preparation assembly and a lime milk preparation assembly. The limestone slurry preparation assembly comprises a first feeding machine, a grinding mill, a mixing machine, a first transfer pump, and a first buffer tank, connected sequentially. When the weight of the limestone slurry in the first buffer tank is not within a first preset range, the first feeding machine, grinding mill, mixing machine, and first transfer pump can adjust their respective operating speeds. The lime milk preparation assembly comprises a lime kiln, a second feeding machine, a nitrifying machine, a third transfer pump, and a second buffer tank, connected sequentially. The entire production line can respond in coordination, with overall automated adjustment of production efficiency and a high level of intelligence.

Disclosed is a limestone slurry and lime milk preparing device for hydrometallurgy of laterite nickel ore, comprising a limestone slurry preparation assembly and a lime milk preparation assembly. The limestone slurry preparation assembly comprises a first feeding machine, a grinding mill, a mixing machine, a first transfer pump, and a first buffer tank, connected sequentially. When the weight of the limestone slurry in the first buffer tank is not within a first preset range, the first feeding machine, grinding mill, mixing machine, and first transfer pump can adjust their respective operating speeds. The lime milk preparation assembly comprises a lime kiln, a second feeding machine, a nitrifying machine, a third transfer pump, and a second buffer tank, connected sequentially. The entire production line can respond in coordination, with overall automated adjustment of production efficiency and a high level of intelligence.

Disclosed is a limestone slurry and lime milk preparing device for hydrometallurgy of laterite nickel ore, comprising a limestone slurry preparation assembly and a lime milk preparation assembly. The limestone slurry preparation assembly comprises a first feeding machine, a grinding mill, a mixing machine, a first transfer pump, and a first buffer tank, connected sequentially. When the weight of the limestone slurry in the first buffer tank is not within a first preset range, the first feeding machine, grinding mill, mixing machine, and first transfer pump can adjust their respective operating speeds. The lime milk preparation assembly comprises a lime kiln, a second feeding machine, a nitrifying machine, a third transfer pump, and a second buffer tank, connected sequentially. The entire production line can respond in coordination, with overall automated adjustment of production efficiency and a high level of intelligence.

Disclosed is a limestone slurry and lime milk preparing device for hydrometallurgy of laterite nickel ore, comprising a limestone slurry preparation assembly and a lime milk preparation assembly. The limestone slurry preparation assembly comprises a first feeding machine, a grinding mill, a mixing machine, a first transfer pump, and a first buffer tank, connected sequentially. When the weight of the limestone slurry in the first buffer tank is not within a first preset range, the first feeding machine, grinding mill, mixing machine, and first transfer pump can adjust their respective operating speeds. The lime milk preparation assembly comprises a lime kiln, a second feeding machine, a nitrifying machine, a third transfer pump, and a second buffer tank, connected sequentially. The entire production line can respond in coordination, with overall automated adjustment of production efficiency and a high level of intelligence.

A process is disclosed for decarbonation of limestone, dolomite or other carbonated materials and hydration of the decarbonated limestone, dolomite or other carbonated materials. The process may include: heating particles of carbonated materials in a reactor of a first circuit; conveying the particles of carbonated materials by a first entraining gas; transferring the decarbonated particles to a second circuit, in which a second gas circulates, the circuit comprising a hydration section; hydrating the decarbonated particles; and transferring at least a portion of the heat generated by the hydration of the decarbonated particles to the second gas being substantially free of carbon dioxide; The first and second circuits are separated by first selective separation means allowing the passage of solids while substantially preventing the passage of the gases.

A process is disclosed for decarbonation of limestone, dolomite or other carbonated materials and hydration of the decarbonated limestone, dolomite or other carbonated materials. The process may include: heating particles of carbonated materials in a reactor of a first circuit; conveying the particles of carbonated materials by a first entraining gas; transferring the decarbonated particles to a second circuit, in which a second gas circulates, the circuit comprising a hydration section; hydrating the decarbonated particles; and transferring at least a portion of the heat generated by the hydration of the decarbonated particles to the second gas being substantially free of carbon dioxide; The first and second circuits are separated by first selective separation means allowing the passage of solids while substantially preventing the passage of the gases.

Reaction schemes involving acids and bases; reactors comprising spatially varying chemical composition gradients (e.g., spatially varying pH gradients), and associated systems and methods, are generally described. For example, methods comprising producing an acid; dissolving a material comprising calcium in the acid to produce calcium ions; treating the calcium ions to produce solid calcium hydroxide and/or calcium oxide; and utilizing the solid calcium hydroxide and/or calcium oxide in a downstream process to produce a cement, wherein the downstream process comprises heating the solid calcium hydroxide and/or calcium oxide in a kiln are described.

Reaction schemes involving acids and bases; reactors comprising spatially varying chemical composition gradients (e.g., spatially varying pH gradients), and associated systems and methods, are generally described. For example, methods comprising producing an acid; dissolving a material comprising calcium in the acid to produce calcium ions; treating the calcium ions to produce solid calcium hydroxide and/or calcium oxide; and utilizing the solid calcium hydroxide and/or calcium oxide in a downstream process to produce a cement, wherein the downstream process comprises heating the solid calcium hydroxide and/or calcium oxide in a kiln are described.

An apparatus includes a fluidized bed vessel with inlet ports arranged to receive a feed stream comprising calcium oxide, calcium carbonate, water, and a fluidizing gas into a fluidized bed vessel. The calcium oxide contacts the water to initiate a hydrating reaction to produce calcium hydroxide and heat. The fluidized bed vessel is configured to operate with a fluidization velocity that fluidizes and separates a portion of the calcium carbonate and a portion of the calcium oxide into a first fluidization regime, and a portion of the calcium hydroxide and at least another portion of the calcium oxide into a second fluidization regime. The apparatus further includes a heat transfer assembly configured to transfer heat of the hydrating reaction to the calcium carbonate, and a cyclone configured to separate a portion of the fluidization gas from at least one of the calcium hydroxide, calcium carbonate, or calcium oxide.

An apparatus includes a fluidized bed vessel with inlet ports arranged to receive a feed stream comprising calcium oxide, calcium carbonate, water, and a fluidizing gas into a fluidized bed vessel. The calcium oxide contacts the water to initiate a hydrating reaction to produce calcium hydroxide and heat. The fluidized bed vessel is configured to operate with a fluidization velocity that fluidizes and separates a portion of the calcium carbonate and a portion of the calcium oxide into a first fluidization regime, and a portion of the calcium hydroxide and at least another portion of the calcium oxide into a second fluidization regime. The apparatus further includes a heat transfer assembly configured to transfer heat of the hydrating reaction to the calcium carbonate, and a cyclone configured to separate a portion of the fluidization gas from at least one of the calcium hydroxide, calcium carbonate, or calcium oxide.