(1. 昆明理工大學(xué) 冶金與能源工程學(xué)院，昆明 650093；
2. 貴州大學(xué) 材料與冶金學(xué)院，貴陽(yáng) 550088；3. 云南冶金集團(tuán)總公司，昆明 650031；
4. 貴陽(yáng)鋁鎂設(shè)計(jì)研究院，貴陽(yáng) 550081；5. 云南建水錳礦有限責(zé)任公司，建水 654302)
摘 要: 對(duì)低品位錳礦硫酸加壓浸出工藝進(jìn)行正交實(shí)驗(yàn)和單因素實(shí)驗(yàn)，通過(guò)正交實(shí)驗(yàn)得出：加壓浸出低品位錳礦工藝中，影響錳浸出率的主要因素的較佳組合如下：初始酸濃度160 g/L、硫鐵礦量50 g、液固比5:1(5 mL/g)、壓力1 MPa、溫度180 ℃、時(shí)間80 min。為分析低品位錳礦中錳、鐵及鋁的浸出行為，實(shí)現(xiàn)這3種金屬元素的高效分離，參考正交實(shí)驗(yàn)結(jié)果適當(dāng)?shù)卣{(diào)整工藝參數(shù)，進(jìn)行單因素實(shí)驗(yàn)研究，詳細(xì)考察始酸濃度、反應(yīng)溫度、硫鐵礦量、液固比、浸出時(shí)間和浸出壓力對(duì)錳、鐵及鋁浸出率的影響，得到優(yōu)化浸出工藝條件如下：低品位錳礦粉100 g，初始硫酸濃度120 g/L，浸出反應(yīng)溫度120 ℃，硫鐵礦量50 g，液固比5:1(5 mL/g)，浸出時(shí)間100 min，浸出壓力0.7 MPa，攪拌轉(zhuǎn)速500 r/min。本工藝具有良好的穩(wěn)定性，在優(yōu)化浸出條件下，錳的浸出率為96%，而鋁和鐵的浸出率分別為38.7%和7.12%，實(shí)現(xiàn)錳選擇性高效溶出，錳和鋁、鐵等雜質(zhì)的分離效果良好，為最終實(shí)現(xiàn)低品位錳礦中各種有價(jià)元素的清潔高效回收奠定了基礎(chǔ)。
關(guān)鍵字: 低品位錳礦；加壓浸出；錳；鐵；鋁
（1. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology,
Kunming 650093, China;
2. College of Materials and Metallurgy, Guizhou University, Guiyang 550088, China;
3. Yunnan Metallurgy Group Parent Company, Kunming 650031, China;
4. Guiyang Aluminium and Magnesium Design Institute Co., Ltd., Guiyang 550081, China;
5. Yunnan Jianshui Manganese Mine Limited Liability Company, Jianshui 654302, China）
Abstract:The pressure leaching process of low grade manganese ore in a sulfuric acid medium was studied by orthogonal experiments and single-factor experiments. First, the better prescription of primary factors which affect the manganese leaching rate were determined through orthogonal experiments, namely initial acidity of 160 g/L, pyrite amount of 50 g, liquid-to-solid ratio of 5:1(5 mL/g), air pressure of 1MPa,leaching temperature of 180 ℃, leaching time of 80min. In order to analyze the leaching behavior of Mn, Fe and Al in the low grade manganese ore and realize highly effective separation of these three metallic elements, the technological parameters were adjusted refering to orthogonal experimental results. The effects of initial acidity, reaction temperature, pyrite amount, liquid-to-solid ratio, leaching time and leaching pressure on leaching rates of Mn, Fe and Al were examined through single-factor experiments. And the optimum leaching conditions were determined to be low grade manganese powdered ore of 100 g, initial acidity of 120 g/L, leaching temperature of 120 ℃, pyrite amount of 50 g, liquid-to-solid ratio of 5:1(5 mL/g), leaching time of 100 min, leaching pressure of 0.7 MPa, the agitation speed of 500 r/min. The experiments results indicate that this technology has good stability. Under the optimized leaching condition, the leaching rate of manganese is 96%, and the leaching rates of Al and Fe are 38.7% and 7.12%, respectively. The selectivity and highly effective dissolution of Mn are realized, the separation effect of Mn with impurities of Fe, Al, and so on, is good. These would lay a good foundation for realizing clean and highly effective recycling of each kind of valuable elements in the low grade manganese ore.
Key words: low grade manganese ore; pressure leaching; manganese; iron; aluminum
