(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 針對現(xiàn)行鎳鉬礦處理工藝存在的鉬鎳需要分別提取的缺陷，提出鎳鉬礦加鈣氧化焙燒−低溫硫酸化焙燒−水浸提取鎳鉬的新工藝。以貴州遵義鎳鉬礦為原料，對CaO加入量、氧化焙燒溫度、氧化焙燒時間、硫酸加入量、硫酸化焙燒溫度、硫酸化焙燒時間以及焙砂水浸工藝參數(shù)對鎳鉬浸出率的影響進(jìn)行研究。結(jié)果表明：在最佳工藝條件下，鉬的浸出率為97.33%，鎳的浸出率為93.16%，且最佳工藝參數(shù)為100 g鎳鉬礦加入35 g CaO，700 ℃氧化焙燒2 h，得到的焙砂加入70 mL濃硫酸，再經(jīng)250 ℃硫酸化焙燒2 h；硫酸化焙燒得到的焙砂按液固比2:1加水?dāng)嚢瑁?jīng)98 ℃浸出2 h。加入CaO不僅能有效減少鎳鉬礦氧化焙燒煙氣對環(huán)境造成的污染，而且能顯著提高鎳的浸出率。
關(guān)鍵字: 鎳鉬礦；氧化焙燒；硫酸化焙燒；水浸
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:In order to leach molybdenum and nickel from Ni-Mo ore, the process of oxidation roasting with CaO, sulphation roasting and water leaching was proposed to extract molybdenum and nickel from the Ni-Mo ore. The process parameters effected the leaching rates of molybdenum and nickel, such as CaO addition, oxidation roasting temperature, and so on were investigated. The experimental results show that 97.33% Mo and 93.16% Ni are extracted from the Ni-Mo ore by oxidation roasting the mixture of 100 g Ni-Mo ore with 35 g CaO at 700 ℃ for 2 h, sulphation roasting the calcine with 70 mL 98% sulphuric acid at 250 ℃ for 2 h, and then water leaching at 98 ℃ for 2 h with the liquid and solid ratio of 2:1. CaO addition can not only protect the environment against SO2 pollution effectively, but also increase nickel leaching rate observably.
Key words: Ni-Mo ore; oxidation roasting; sulphation roasting; water leaching
