Nickel laterite ore ammonia gas reduction method

• Main Authors: LIU CHENG, XU XIAOFENG, DING CHONG, QI YONGFENG, CHEN XUEGANG, GOU HAIPENG
• Format: Patent
• Language: Chinese; English
• Published: 31.05.2024
• Subjects: CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; MANUFACTURE OF IRON OR STEEL; METALLURGY; METALLURGY OF IRON; PRETREATMENT OF RAW MATERIALS; PRODUCTION AND REFINING OF METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention discloses an ammonia gas reduction method for laterite-nickel ore. The ammonia gas reduction method comprises the following steps: preheating and decomposing ammonia gas: heating and decomposing the ammonia gas to obtain pretreatment gas mixed by the ammonia gas, hydrogen gas and nitrogen gas; the laterite-nickel ore powder is heated to 1000 DEG C to 1200 DEG C, inert gas is introduced for constant-temperature treatment for 10 min or above, then pretreatment gas is introduced for reduction, and the reduction time is within 30 min to 120 min; in the reduction process, the flow Q of ammonia gas corresponding to the pretreatment gas is controlled to be the theoretical gas consumption of reduced iron and nickel oxide * (9-11)/reaction time. By controlling the flow, the temperature and the pressure of the reducing gas in the reaction process, the reduction effect is achieved, and meanwhile iron nitride is effectively prevented from being generated. 本发明公开了一种红土镍矿氨气还原方法，包括：氨气预热分解：将氨气加热分解获得氨气、氢气、氮气混合的预处理