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Method for producing ferronickel through selective reduction and synchronous drying dehydration-electric furnace smelting of silicon-magnesium type laterite-nickel ore
A method for producing ferronickel through selective reduction, synchronous drying dehydration and electric furnace smelting of silicon-magnesium type laterite-nickel ore belongs to the technical field of mineral processing and metallurgy and comprises the following steps: crushing the silicon-magnesium type laterite-nickel ore, placing the crushed silicon-magnesium type laterite-nickel ore in a stock bin, feeding the crushed silicon-magnesium type laterite-nickel ore into a multi-stage cyclone preheating drying system, removing adsorbed water through preheating airflow, and heating to remove structural water to form a dry material; performing gas-solid separation on the dried material to form a primary solid material which enters a reduction reactor; the high-temperature flue gas returns to the preheating and drying system and is continuously preheated and dried; nitrogen and methane or natural gas are respectively introduced into an inlet of the reduction reactor, and a formed reduction material flows out; secondary solid materials obtained after gas-solid separation of the reduction materials enter the smelting reactor, and excessive methane returns to the main furnace to be combusted for heat supply; and mixing the secondary solid material with a flux, adjusting the silicon-magnesium ratio, smelting, and cooling to obtain the ferro-nickel alloy and slag. The method solves the practical problems of easy ring formation, low operation efficiency, high power consumption and the like of the rotary kiln in a rotary kiln pre-reduction-electric furnace smelting process.
一种硅镁型红土镍矿选择性还原同步干燥脱水‑电炉熔炼生产镍铁的方法，属于矿物加工及冶金技术领域，步骤如下：硅镁型红土镍矿破碎置于料仓，给入多级旋风预热干燥系统，经预热气流脱去吸附水后加热脱去结构水，形成干燥物料；干燥物料气固分离后形成一次固体物料进入还原反应器；高温烟气返回预热干燥系统，继续进行预热干燥；在还原反应器的入口分别通入氮气和甲烷或天然气，形成的还原物料流出；还原物料气固分离后的二次固体物料进入熔炼反应器，过剩甲烷返回主炉燃烧供热；二次固体物料与熔剂混合调整硅镁比后熔炼，冷却得到镍铁合金和炉渣。本方法解决了回转窑预还原‑电炉熔炼工艺回转窑易结圈、作业效率低、电耗高等实际问题。
Method for producing ferronickel through selective reduction and synchronous drying dehydration-electric furnace smelting of silicon-magnesium type laterite-nickel ore
A method for producing ferronickel through selective reduction, synchronous drying dehydration and electric furnace smelting of silicon-magnesium type laterite-nickel ore belongs to the technical field of mineral processing and metallurgy and comprises the following steps: crushing the silicon-magnesium type laterite-nickel ore, placing the crushed silicon-magnesium type laterite-nickel ore in a stock bin, feeding the crushed silicon-magnesium type laterite-nickel ore into a multi-stage cyclone preheating drying system, removing adsorbed water through preheating airflow, and heating to remove structural water to form a dry material; performing gas-solid separation on the dried material to form a primary solid material which enters a reduction reactor; the high-temperature flue gas returns to the preheating and drying system and is continuously preheated and dried; nitrogen and methane or natural gas are respectively introduced into an inlet of the reduction reactor, and a formed reduction material flows out; secondary solid materials obtained after gas-solid separation of the reduction materials enter the smelting reactor, and excessive methane returns to the main furnace to be combusted for heat supply; and mixing the secondary solid material with a flux, adjusting the silicon-magnesium ratio, smelting, and cooling to obtain the ferro-nickel alloy and slag. The method solves the practical problems of easy ring formation, low operation efficiency, high power consumption and the like of the rotary kiln in a rotary kiln pre-reduction-electric furnace smelting process.
一种硅镁型红土镍矿选择性还原同步干燥脱水‑电炉熔炼生产镍铁的方法，属于矿物加工及冶金技术领域，步骤如下：硅镁型红土镍矿破碎置于料仓，给入多级旋风预热干燥系统，经预热气流脱去吸附水后加热脱去结构水，形成干燥物料；干燥物料气固分离后形成一次固体物料进入还原反应器；高温烟气返回预热干燥系统，继续进行预热干燥；在还原反应器的入口分别通入氮气和甲烷或天然气，形成的还原物料流出；还原物料气固分离后的二次固体物料进入熔炼反应器，过剩甲烷返回主炉燃烧供热；二次固体物料与熔剂混合调整硅镁比后熔炼，冷却得到镍铁合金和炉渣。本方法解决了回转窑预还原‑电炉熔炼工艺回转窑易结圈、作业效率低、电耗高等实际问题。
Method for producing ferronickel through selective reduction and synchronous drying dehydration-electric furnace smelting of silicon-magnesium type laterite-nickel ore
一种硅镁型红土镍矿选择性还原同步干燥脱水-电炉熔炼生产镍铁的方法
HAN YUEXIN (Autor:in) / YU JIANWEN (Autor:in) / LI PEIYU (Autor:in) / LI YANJUN (Autor:in) / GAO PENG (Autor:in) / JIN JIANPING (Autor:in) / SUN YONGSHENG (Autor:in)
08.03.2024
Patent
Elektronische Ressource
Chinesisch
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