(1. 廣州有色金屬研究院 稀有金屬研究所，廣州 510650；
2. 中南大學(xué) 冶金與環(huán)境學(xué)院，長(zhǎng)沙 410083；
3. 廣東省稀土開(kāi)發(fā)及應(yīng)用重點(diǎn)實(shí)驗(yàn)室，廣州 510650)
摘 要: 對(duì)高鎂低品位復(fù)雜鉑鈀精礦進(jìn)行工藝礦物學(xué)分析，提出采用硫酸氧壓浸出工藝對(duì)該精礦中的賤金屬銅、鎳、鐵選擇性浸出分離并富集鉑鈀的處理工藝。考察磨礦粒度、反應(yīng)溫度、時(shí)間、初始硫酸濃度、氧壓、攪拌速度、木質(zhì)素磺酸鈣用量、液固比對(duì)銅、鎳、鐵浸出率及渣率的影響，確定最佳工藝參數(shù)。實(shí)驗(yàn)結(jié)果表明：當(dāng)精礦粒度小于43 μm占有率為93%、時(shí)間3 h、浸出溫度150 ℃、初始硫酸濃度2 mol/L、氧分壓0.7 MPa、攪拌速度400 r/min、添加劑木質(zhì)素磺酸鈣用量0.6 g、液固比5:1的最佳工藝條件下，銅浸出率達(dá)99.27%、鎳浸出率達(dá)98.04%、渣率為37%左右，鉑鈀幾乎不被浸出，鉑和鈀在浸出渣中富集近3倍。
關(guān)鍵字: 鉑；鈀；浮選精礦；氧壓浸出
（1. Department of Rare Metal, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China;
2. School of Metallurgy and Environment, Central South University, Changsha 410083, China;
3. Guangdong Province Key Laboratory of Rare Earth Development and Application, Guangzhou 510650, China）
Abstract:The process mineralogy investigation and the oxygen pressure leaching of low grade Pt-Pd concentrate with high content of magnesium were studied. Sulfuric acid pressure-oxidation leaching process was employed to achieve the selective leaching of copper, nickel, iron and enrichment of Pt-Pd. The effects of process parameters including the particle size, sulphuric acid concentration, the amount of calcium lignosulfonate, oxygen pressure, stirring speed, liquid-solid ratio, leaching temperature and time on the slag rate and leaching rates of copper, nickel and iron were investigated. The results show that leaching rates of copper and nickel are 99.27% and 98.04%, respectively, and slag rate is 37% under the leaching conditions of concentrate particle size d93＜43 μm, leaching time of 3 h, leaching temperature of 150 ℃, sulphuric acid concentration initial 4 mol/L, oxygen pressure of 0.7 MPa, stirring speed of 400 r/min, calcium lignosulfonate of 0.4% and liquid-solid ratio of 5:1. Moreover, Pt and Pd are still not leached and the grade of Pt-Pd concentrate could be increased by 3 times after leaching process.
Key words: platinum; palladium; flotation concentrate; oxygen pressure leaching
