Please select the most similar patent number from A, B, C and D. Which number is?
A method for reducing oxide ores by using a square carbonization chamber of a coking plant, comprising performing mixing; pressing ores into spheres by means of a ball pressing machine, and putting same into the square carbonization chamber from the top to perform reduction reaction, or directly pulverizing block-shaped oxides into regular small blocks and mixing same with a carbonaceous reductant before being put into the square carbonization chamber from the top to perform reduction reaction, or pressing the oxides into the shapes of honeycomb briquettes having holes and then pushing same into the square carbonization chamber from a side surface by means of a tray to perform reduction reaction, so as to well adapt to reduction reaction of oxide ores in different forms, and generate a simple-substance metal material.
A: A method for directly preparing high quality silicon nitride powder by a combustion synthesis method, which uses the silicon powder as a raw material and uses a reactive metal as a reducing agent. The method comprises the following steps: mixing reaction raw materials such as silicon powder and a silicon nitride diluent by proportion, and then adding a quantitative amount of metal powder to uniformly mix with the reaction raw materials, placing a mixture into a combustion synthesis reaction device, and inducing the reaction under a specific pressure to obtain the high quality silicon nitride powder. According to the process method in the present invention, the reactive metal having a stronger reducibility than the reaction raw material is used to reduce oxygen in the reaction raw material so as to generate a corresponding metal oxide. The silicon nitride powder prepared by the process method in the present invention has low oxygen content, good crystallinity, high purity, and excellent sintering performance.
B: A method for regenerating a ternary precursor by using a nickel-cobalt-manganese residue, comprising: mixing a nickel-cobalt-manganese residue, water, and a reducing agent, adjusting the obtained mixed solution to alkaline, and then mixing same with an ammonium salt to obtain a mixed slurry; and carrying out a hydrothermal reaction on the mixed slurry to obtain a ternary precursor. The nickel-cobalt-manganese residue and the reducing agent are mixed for a hydrothermal reaction; under the action of the reducing agent, a metal oxide in the nickel-cobalt-manganese residue is reduced to a corresponding +2-valent metal hydroxide or carbonate; the morphology and particle size of the product are controlled by adjusting the pH value, adding an ammonium salt, and controlling the hydrothermal reaction temperature; finally, the obtained product can restore the morphology and electrochemical performance of the original ternary precursor. The method for regenerating a ternary precursor by using a nickel-cobalt-manganese residue allows for direct reduction of a nickel-cobalt-manganese residue into a ternary precursor, can implement recycling of waste ternary positive electrode materials, and has a great application prospect.
C: A method for preparing metal magnesium and magnesium-aluminium spinel with active magnesia and aluminium or an aluminium alloy as raw materials, comprising the following steps: (1) calcinating magnesite or brucite, and grinding to obtain an active magnesia powder; (2) homogenously mixing a reductant and the active magnesia powder, to prepare a mixture compacted into a lump; (3) reducing at 1,100-1,300°C, to produce a gaseous metal magnesium and a solid cake slag; (4) finely grinding the solid cake slag, obtaining a lump by compacting, and obtaining a product magnesium-aluminium spinel by calcinating. In the method of the present invention, the calcinated active magnesia is used as the raw material and reacted with aluminium or aluminium alloy, to produce metal magnesium and magnesium-aluminium spinel, in which the aluminium powder is an industrial aluminium powder or an aluminium powder produced by recycling waste aluminium, and the aluminium alloy powder is an industrial aluminium alloy powder or an aluminium alloy powder produced by recycling waste aluminium alloy. The method has a simple process and a low cost, and is thus suitable for industrialized production.
D: An ore powder reduction method and a system thereof. The ore powder reduction method comprises: reacting coal, vapor and oxygen in a gasification reactor (100) to obtain a reducing gas comprising carbon monoxide and hydrogen; reacting the reducing gas and ore powder in a fluidized bed reduction reactor (200) to obtain a reduction product and a reduction exhaust; performing desulfurization and decarburization processing on the reduction exhaust to obtain a purified reduction exhaust; and introducing the purified reduction exhaust into the fluidized bed reduction reactor (200). By using the method, ore powder can be effectively reduced, thereby saving the cost and improving the reduction efficiency of the ore powder.
Answer: D