本文關(guān)鍵詞： 煤矸石 徑向流 循環(huán)淋溶 淋溶液特性 重金屬　出處：《中國環(huán)境科學(xué)》2016年07期 　論文類型：期刊論文

【摘要】：采用新型循環(huán)淋溶裝置對(duì)煤矸石進(jìn)行連續(xù)240h的淋溶實(shí)驗(yàn),研究了煤矸石中重金屬在淋溶過程中的溶出規(guī)律,通過向淋溶液中添加聚丙烯酰胺(CPAM)考察了固體顆粒物的沉降特性.結(jié)果表明:隨著淋溶反應(yīng)時(shí)間延長,煤矸石中堿金屬Na元素溶于水,形成堿性溶液,這兩種因素導(dǎo)致淋溶反應(yīng)初期淋溶液p H值升高.As、Zn離子濃度在淋溶時(shí)間為1~24h時(shí)呈上升趨勢(shì),而在24~72h,離子濃度呈下降趨勢(shì).淋溶液中Cr、Pb、Ba離子濃度在120h內(nèi)均呈現(xiàn)上升趨勢(shì),而在120~240h,對(duì)于Cr離子來說,淋溶液的堿性環(huán)境促使Cr離子溶出率增大,但取樣次數(shù)的增多也對(duì)Cr離子的濃度降低起到促進(jìn)作用;淋溶液稀釋和Ba離子的沉淀化合物形成,導(dǎo)致淋溶液中Ba離子濃度降低.120~240h,淋溶液中有機(jī)物被微生物的生化作用分解以及取樣后外加塌陷區(qū)水體對(duì)淋溶液中COD和BOD起到稀釋作用,使COD和BOD降低.在淋溶反應(yīng)24h內(nèi),淋溶液中TON和NH_3-N出現(xiàn)波浪式變化,淋溶時(shí)間大于24h時(shí),TON和NH_3-N總體呈升高趨勢(shì).隨著淋溶時(shí)間延長,淋溶液中的固體顆粒物沉降速度逐漸變慢,延長了沉降時(shí)間.煤矸石中一些含氮化合物溶解于水中,使淋溶液中電離出NH_4~+離子,形成堿性環(huán)境.
[Abstract]:The leaching experiment of coal gangue was carried out for 240 hours with a new circulating leaching device, and the leaching law of heavy metals in coal gangue during leaching was studied. The sedimentation characteristics of solid particles were investigated by adding polyacrylamide (CPAM) to leaching solution. The results showed that Na in coal gangue dissolved in water with the prolongation of leaching time. The alkaline solution was formed. These two factors led to the increase of pH value of leaching solution at the initial stage of leaching reaction. The concentration of Zn ion increased when the leaching time was 1 ~ 24 h, but increased at 24 h. The concentration of Cr ~ (2 +) Pb ~ (2 +) in leaching solution increased within 120 h, but at 120 ~ 240 h, for Cr ~ (2 +). The alkaline environment of leaching solution promoted the dissolution rate of Cr ion, but the increase of sampling times also promoted the decrease of Cr ion concentration. The dilution of leaching solution and the formation of precipitated compounds of Ba ions resulted in the decrease of concentration of Ba ions in leaching solution for .120 ~ 240 h. The organic matter in leaching solution was decomposed by biochemistry action of microorganism and the water body in the collapsing area diluted the COD and BOD in the leaching solution after sampling. The COD and BOD were decreased and the leaching reaction was carried out within 24 hours. The changes of TON and NH_3-N in leaching solution were wave-like, and when the leaching time was longer than 24 h, ton and NH_3-N showed a general increasing trend, and with the prolongation of leaching time. The settling rate of solid particles in leaching solution became slower and the settling time was prolonged. Some nitrogen-containing compounds in coal gangue dissolved in water, so that NH _ 4 ~ + ions were ionized out from leaching solution and the alkaline environment was formed.
【作者單位】： 中國礦業(yè)大學(xué)(北京)化學(xué)與環(huán)境工程學(xué)院;內(nèi)蒙古工業(yè)大學(xué)能源與動(dòng)力工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51074170) 新疆維吾爾族自治區(qū)科技攻關(guān)計(jì)劃(201532108) 國土資源部煤炭資源勘查與綜合利用重點(diǎn)實(shí)驗(yàn)室開放研究課題(KF2015-3)
【分類號(hào)】：X752
【正文快照】：

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