Extraction of nickel and cobalt from laterite using a microwave assisted hydrothermal leaching method
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摘要: 采用微波水熱鹽酸浸出方法對腐泥土型紅土鎳礦提取鎳鈷進行了研究,詳細探討了焙燒預處理、微波水熱浸出溫度和浸出時間對鎳鈷浸出率的影響.對于300℃焙燒預處理后的紅土鎳礦,微波水熱溫度為50℃,浸出時間為1 h時,鎳的浸出率高達93.65%,鈷的浸出率為87.86%.紅土鎳礦的微波水熱浸出體系與普通水熱浸出體系相比,鎳和鈷的浸出效果更好.研究表明,擴散過程是鎳、鈷浸出過程的主要限制環節.Abstract: A microwave assisted hydrothermal leaching method was used to extract nickel and cobalt from saprolite laterite. The effects of roasting pretreatment, leaching temperature and time on the extraction ratios of nickel and cobalt were investigated in detail. The extraction ratio of 93. 65% for nickel and 87. 86% for cobalt can be obtained respectively when the leaching temperature and time are 50℃ and 1 h for saprolite laterite only pre-roasted at 300℃. Comparing the microwave assisted hydrothermal leaching method with a hydrothermal leaching method, nickel and cobalt can be extracted more efficiently from the laterite. The experimental data indicate that the leaching process of nickel and cobalt is a diffusion-controlled process.
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Key words:
- laterite /
- microwave heating /
- hydrothermal methods /
- extraction /
- nickel /
- cobalt /
- roasting
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