(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 研究從鎢渣中回收錳的新工藝，通過(guò)鎢渣的低溫硫酸化焙燒、燒結(jié)塊浸出、浸出液除雜、溶液中水解沉錳及氫氧化錳氧化獲得Mn3O4粉末，采用SEM和XRD對(duì)產(chǎn)品粉末進(jìn)行分析。結(jié)果表明：在濃硫酸過(guò)量150%、焙燒時(shí)間90 min、浸出溫度98 ℃、浸出時(shí)間120 min的條件下，Mn浸出率達(dá)到88.9%。浸出液可以通過(guò)硫化物沉淀除重金屬、硫酸復(fù)鹽沉淀法深度凈化除雜、中和水解除Fe，水解沉錳也有一定的凈化作用，溶液pH值為6.56時(shí)，除鐵率達(dá)到99.91%。凈化液經(jīng)水解沉錳后采用10%H2O2氧化，在氫氧化錳氧化過(guò)程中，溶液pH值對(duì)產(chǎn)物物相的影響較大；溶液pH值為8時(shí)在50 ℃沉錳，并以過(guò)量150%的H2O2氧化反應(yīng)20min，獲得粒度小于0.1 μm的Mn3O4粉末。
關(guān)鍵字: 四氧化三錳；鎢渣；回收；焙燒
mangano-manganic oxide from tungsten residue
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:In order to recover manganese from tungsten residue, a corresponding technology to prepare mangano-manganic oxide was adopted as follows: low temperature sulfating roasting tungsten residue, leaching, removal of impurities in leachate, precipitation of manganese and oxidation of manganese hydroxide. The product was analyzed by SEM and XRD. The results of roasting and leaching show that the recovery of Mn is 88.9% after roasting with 150% excess of concentrated H2SO4 for 90 min and leaching at 98 ℃ for 120 min. The purification of leaching liquor can be carried out through sulfide precipitation and complex sulfate precipitation and neutralizing hydrolysis. In addition precipitation in Mn by hydrolysis favors the purification of the leach liquor. The removal of iron reaches 99.91% when the pH value of solution is 6.56. The precipitate bearing Mn from the leach liquor was oxidized with 10% H2O2 (mass fraction). The results show that the pH value of solution in the oxidation process has significant effect on the products. The mangano-manganic oxide with diameter of less than 0.1 μm is prepared as oxidizing with 150% excess of H2O2 for 20 min after precipitating at 50 ℃ from the liquor with pH value of 8.
Key words: mangano-manganic oxide; tungsten residue; recovery; roasting
