本文選題：錳礦酸浸渣 + 可溶錳��； 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：錳礦酸浸渣(簡稱錳渣)是指采用硫酸浸出錳礦過程中所產(chǎn)生的廢棄物,一般只采取簡易堆放或簡單填埋的處置方法。近年來,由于我國錳產(chǎn)業(yè)的發(fā)展,富錳礦資源已接近枯竭,大多數(shù)工廠不得不使用低品位錳礦進(jìn)行生產(chǎn),產(chǎn)生的錳渣不斷增多,所造成的環(huán)境問題日益凸顯。因此,研究錳渣穩(wěn)定化處理工藝,不僅可以消除環(huán)境污染隱患,而且為錳行業(yè)可持續(xù)發(fā)展提供了一種新的思路。本文使用廣西某錳產(chǎn)品生產(chǎn)企業(yè)的錳渣,首先對其理化性質(zhì)進(jìn)行分析。結(jié)果表明,實驗使用的錳渣pH值在6.5左右,顯弱酸性,錳渣中總錳含量為6.08%,其中可溶錳含量約占總錳的25%左右,碳酸錳含錳量為3.39%。浸出毒性檢測結(jié)果表明,錳渣浸出液中可溶錳離子的濃度為378.0 mg/L,是GB8978-1996《污水綜合排放標(biāo)準(zhǔn)》最高允許排放濃度標(biāo)準(zhǔn)(2.00 mg/L)的189倍。因此,可溶錳是錳渣中主要的污染物質(zhì)。在錳渣穩(wěn)定化實驗研究中,分別探索了采用氧化鈣、硅酸鈉和磷酸鈉處理錳礦酸浸渣的工藝。結(jié)果表明：(1)使用經(jīng)干燥后的錳渣20.00 g,氧化鈣加入量為1.50 g,用水調(diào)至錳渣含水率為100%,在不通風(fēng)無日照的條件下放置0.5 h,浸出毒性測試可溶錳濃度為1.22 mg/L。(2)使用經(jīng)干燥后的錳渣20.00 g,硅酸鈉加入量為0.50 g,調(diào)節(jié)物料液固比5：1,pH 8.0,在攪拌速度250 r/min,30 ℃條件下反應(yīng)15 min,可溶錳固化率為97.11%,浸出毒性測試可溶錳濃度為1.12 mg/L。(3)使用經(jīng)干燥后的錳渣20.00 g,磷酸鈉加入量為1.25 g,調(diào)節(jié)物料液固比6：1,pH 8.0,在攪拌速度200 r/min,30℃條件下反應(yīng)15 min,可溶錳固化率為95.83%,浸出毒性測試可溶錳濃度為1.42 mg/L。以上三種處理方式,可溶錳濃度均低于國家標(biāo)準(zhǔn)。此外,本文采用XRD、SEM和化學(xué)分析等測試分析手段對穩(wěn)定劑在錳渣中的固錳機(jī)理進(jìn)行了初步探討。結(jié)果表明,穩(wěn)定劑和可溶錳離子發(fā)生反應(yīng)生成硅酸鹽、磷酸鹽等難溶物以及形成的膠凝現(xiàn)象是可溶性錳減少的主要原因,空氣中的氧氣和氫氧化錳反應(yīng)產(chǎn)生的Mn02等錳化合物也對可溶錳離子的穩(wěn)定化有一定的作用。
[Abstract]:Manganese ore acid leaching residue (manganese slag) refers to the waste produced in the process of leaching manganese ore by sulfuric acid. In general, only simple or simple disposal methods are adopted. In recent years, because of the development of the manganese industry in China, the manganese ore resources have been nearly exhausted, and most of the factories must not use low grade manganese ore for production. In addition, the environmental problems are becoming increasingly prominent. Therefore, the study of manganese slag stabilization treatment process can not only eliminate the hidden dangers of environmental pollution, but also provide a new way of thinking for the sustainable development of manganese industry. In this paper, the physical and chemical properties of manganese residue in a manganese product production enterprise in Guangxi are analyzed. The results show that the experiment is used. The pH value of manganese slag is about 6.5, showing weak acidity, the total manganese content in manganese slag is 6.08%, and the soluble manganese content is about 25% of the total manganese. The manganese content of manganese carbonate is 3.39%. leaching toxicity test results show that the concentration of soluble manganese ion in the leaching solution of manganese slag is 378 mg/L, which is the comprehensive emission standard of GB8978-1996< sewage and the highest permissible discharge standard. It is 189 times of (2 mg/L). Therefore, soluble manganese is the main pollution substance in manganese slag. In the experimental study on the stabilization of manganese slag, the process of using calcium oxide, sodium silicate and sodium phosphate to treat manganese leaching residue was explored. The results showed that (1) the use of dried manganese slag 20 g and calcium oxide added to 1.50 g, the water content of manganese slag was adjusted to the water content of manganese slag. For 100%, 0.5 h was placed under the condition of non ventilation and no sunshine. The leaching toxicity test of soluble manganese concentration was 1.22 mg/L. (2) using the dried manganese slag 20 g, the sodium silicate added to 0.50 g, the liquid solid ratio 5:1, pH 8, at the stirring speed 250 r/min, 30 temperature reaction 15 min, the soluble manganese curing rate was 97.11%, leaching toxicity test The soluble manganese concentration is 1.12 mg/L. (3) using the dried manganese slag 20 g, the sodium phosphate added to 1.25 g, the material liquid solid ratio 6:1, pH 8, the stirring speed 200 r/min, 30 centigrade reaction 15 min, the soluble manganese curing rate is 95.83%, the leaching toxicity test manganese concentration is 1.42 mg/L. above 1.42 mg/L., the soluble manganese concentration is all In addition, the mechanism of manganese fixation in manganese residue was preliminarily discussed by means of XRD, SEM and chemical analysis. The results showed that the reaction of stabilizers and soluble manganese ions produced silicate, phosphate and other difficult insoluble substances and the formation of gelation were the main reasons for the reduction of soluble manganese. The Mn02 and other manganese compounds produced by the reaction of oxygen in the gas and manganese hydroxide also play a certain role in stabilizing the soluble manganese ions.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：X757

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本文編號：2049778