(1. 蘭州三普電力有限公司，蘭州 730070；
2. 蘭州城市學(xué)院 化學(xué)與環(huán)境科學(xué)學(xué)院，蘭州 730070)
摘 要: 為提高鉻鐵粉礦中的鉻鐵比，依據(jù)選擇性碳熱還原原理，利用微波對南非鉻鐵粉礦進(jìn)行加熱還原，然后用稀鹽酸對其浸取，最后進(jìn)行過濾分離，得到高鉻鐵比的鉻鐵精礦。研究工藝參數(shù)，如還原劑的用量、還原溫度和時(shí)間等因素對鉻鐵礦還原酸浸后鐵和鉻浸取率的影響。結(jié)果表明：當(dāng)還原劑用量為6.0 g，還原溫度為 (1 100 ±25) ℃，還原時(shí)間為(20±2) min時(shí)，100 g鉻鐵粉礦經(jīng)還原酸浸后，其鉻鐵比由1.4~1.6升至2.6~3.2。同時(shí)，對酸液中浸出的鐵進(jìn)行了回收，獲得副產(chǎn)品氧化鐵紅。
關(guān)鍵字: 鉻鐵粉礦；選擇性還原；微波處理；氧化鐵
（1. Lanzhou Sanpu Electric Power Co., Ltd, Lanzhou 730070, China;
2. School of Chemistry and Environmental Science, Lanzhou City University, Lanzhou 730070, China）
Abstract:In order to raise the ratio of chromium to iron in chromite fines, chromite fines from South Africa were reduced selectively by microwave heating based on the principle of selective carbothermic reduction of chromite. Then, chromite fines were submerged in dilute hydrochloric acid. Finally, chromite concentrate was obtained by filtration separation and the ratio of chromium to iron in chromite fines increased. The influences of technical parameters, such as the amount of reducing agent, reducing temperature and time, on leaching rates of iron and chromium were investigated through single factor experiments. The results show that, after chromite fines(100 g) treated with reduction and acid leaching, the ratio of chromium to iron increases from 1.4-1.6 to 2.6-3.2, under the optimal conditions of the dosage of reducing agent 6.0 g, reducing temperature (1 100±25) ℃ and reducing time (20±2) min. Iron in dilute acid solution was recovered and a by-product of iron oxide was obtained.
Key words: chromite fines; selective reduction; microwave treatment; iron oxide
