本文關鍵詞：基于粒子研磨作用的廢鉛膏脫硫新方法實驗研究　出處：《湘潭大學》2016年碩士論文　論文類型：學位論文

  更多相關文章： 廢鉛膏 預脫硫 表面更新 研磨

【摘要】：廢鉛酸蓄電池資源循環(huán)是國民經(jīng)濟的重要組成部分,對鉛酸蓄電池破碎分選得到廢鉛膏進行預脫硫處理,再低溫熔煉是一條公認的鉛清潔回收工藝。傳統(tǒng)的預脫硫反應在間歇攪拌釜中進行,憑借攪拌產(chǎn)生的水力剪切作用來破除反應物硫酸鉛顆粒表面包裹的脫硫產(chǎn)物層,盡管反應器結(jié)構(gòu)簡單,但存在轉(zhuǎn)化率低,脫硫不徹底的問題,致使低溫熔煉無法進行。本文提出鉛膏預脫硫“表面更新”模式,在攪拌釜中添加粒子作為碰撞研磨介質(zhì),反應漿液與粒子在反應器內(nèi)旋轉(zhuǎn),對反應顆粒進行碰撞、研磨,即時破壞產(chǎn)物碳酸鉛包裹層,實現(xiàn)反應顆粒表面更新。構(gòu)建了實驗系統(tǒng),研究了碳酸鈉在表面更新實驗系統(tǒng)中的鉛膏脫硫性能。實驗表明,在轉(zhuǎn)速500r/min、溫度50℃、漿液濃度30%-60%、摩爾比n(Na2CO3):n(PbSO4)=1.1:1條件下,反應40分鐘,鉛膏含硫率0.5%,滿足低溫熔煉的要求。為適應工業(yè)大規(guī)模生產(chǎn),構(gòu)建內(nèi)循環(huán)研磨脫硫系統(tǒng),在鉛膏漿也罐內(nèi)設置2個研磨脫硫器,脫硫器下部配置高速攪拌漿作為鉛膏漿液循環(huán)流經(jīng)脫硫器的動力源,脫硫器內(nèi)設置螺旋導流板,并填充粒子作為研磨介質(zhì)。采用(NH4)2CO3做脫硫劑,實驗研究了內(nèi)循環(huán)研磨脫硫系統(tǒng)的鉛膏脫硫性能,在轉(zhuǎn)速600r/min、溫度40℃、漿液濃度40%-60%、摩爾比n(NH4)2CO3):n(PbSO4)=1.1:1條件下,反應30分鐘,反應后固體含硫率小于0.3%。重金屬雜質(zhì)的凈化對鉛膏脫硫副產(chǎn)物的綜合利用至關重要,采用硫化銨沉淀法凈化脫硫副產(chǎn)物硫酸銨溶液中的重金屬。實驗研究了過量的脫硫劑碳酸銨對重金屬凈化的影響,同時實驗了溫度、pH和硫化銨添加量對重金屬去除的影響。C (Mn+):C ((NH4)2S)=1:2.5、25℃-35℃、 pH=8-9,反應20min,重金屬雜質(zhì)總量降低到0.94mg/L以下,滿足國家廢水中重金屬含量標準。
[Abstract]:Waste lead acid battery resource cycle is an important part of the national economy. Remelting is a recognized clean recovery process of lead. The traditional pre-desulphurization reaction is carried out in a batch stirred kettle. Although the reactor structure is simple, but the conversion rate is low and desulfurization is not complete, hydraulic shear action produced by stirring is used to break down the desulfurization product layer wrapped on the surface of the reactant lead sulfate. In this paper, the "surface renewal" mode of lead paste pre-desulphurization is put forward, in which particles are added to the agitator as collisional grinding medium, and the reaction slurry and particle rotate in the reactor. The reaction particle was collided, ground, destroyed the product lead carbonate coating immediately, and realized the surface renewal of the reaction particle. The experimental system was constructed. The desulphurization performance of sodium carbonate in the surface renewal experiment system was studied. The experimental results showed that at the rotational speed of 500 r / min, the temperature was 50 鈩，

本文編號：1406510