【摘要】：本文以榆林孫家岔低變質(zhì)粉煤與煤直接液化殘渣為原料制備的新型煤基電極材料作為陰陽極,采用電吸附技術(shù)處理氰化提金廢水。主要針對高濃度提金廢水與硫酸鋅沉淀后液,研究了煤基電極材料的制備條件與電吸附工藝條件對電吸附過程的影響及工藝技術(shù)參數(shù),并深入探討了反應(yīng)機理。研究表明,在碳化溫度800℃、HNO3濃度10%、活化時間16h的條件下,自制的煤基電極材料吸附能力最強,處理效果最佳。當吸附電壓為2v、吸附時間5h、極板間距5mm、溶液體積50ml時,沉淀后液中Cu、總氰、硫氰根和Zn的去除率分別可達到90.63%、71.49%、41.35%和27.84%。而當吸附電壓為2v、吸附時間24h、極板間距10mm、溶液體積50ml時,高濃度氰化提金廢水中Zn、Fe離子的去除率分別達到99.52%、83.28%,而Cu離子、SCN-及總氰離子去除率并不是很高,但其離子濃度分別減少2080.25mg/L、5738.50 mg/L與3720.84 mg/L。長時間吸附并更換電極片的連續(xù)吸附實驗表明,溶液中Cu、總氰、游離氰、硫氰根、Zn和Fe的去除率分別達99.91%、98.29%、63.40%、81.87%、100%、99.17%。陽極板的SEM-EDS分析、電吸附過程沉淀物的XRD分析及電吸附過程現(xiàn)象的分析結(jié)果表明,電吸附過程可分為陰陽離子定向遷移、富集沉淀、陽極吸附的三個部分。在直流電場的作用下溶液中金屬氰絡(luò)合離子、游離氰及硫氰根等陰離子產(chǎn)生定向運動,逐漸向陽極富集。陽極發(fā)生氧氣的析出及游離氰根的氧化反應(yīng),導(dǎo)致局部氫氧根離子濃度下降,此時陽極附近富集的各種離子會產(chǎn)生絡(luò)合沉淀反應(yīng)生成大量的硫氰酸銅和少量氰化亞銅、氰化鋅白色沉淀物或者紅棕色亞鐵氰化銅,同時,游離氰、硫氰根及金屬氰絡(luò)合離子會吸附于陽極表面,導(dǎo)致溶液中各種離子濃度減少,達到綜合回收的目的。
[Abstract]:In this paper, a new type of coal-based electrode material, which is prepared from Sunjiacha low-metamorphic pulverized coal and coal direct liquefaction residue, is used as cathode and anode, and electrosorption technology is used to treat cyanide gold extraction wastewater. In this paper, the effects of preparation conditions and electroadsorption process conditions of coal-based electrode materials on the electrosorption process and technological parameters were studied, and the reaction mechanism was discussed. The results show that under the conditions of carbonization temperature 800 鈩，

本文編號：2264475