發(fā)布時(shí)間：2018-10-22 13:28

【摘要】：以高爐礦渣、粉煤灰為地聚合物膠凝材料原料,配合復(fù)合化學(xué)激發(fā)劑固化砷鈣渣,并采用X射線衍射(XRD)、傅里葉變換紅外光譜(FTIR)和掃描電子顯微鏡(SEM)探究固砷機(jī)理。研究結(jié)果表明,固化體優(yōu)選質(zhì)量配比為高爐礦渣粉∶粉煤灰∶砷鈣渣=4∶2∶4,配合1.5%~2.0%的NaOH和工業(yè)水玻璃復(fù)合化學(xué)激發(fā)劑,固化體砷浸出濃度0.5~0.9mg/L,低于危險(xiǎn)廢物浸出毒性鑒別標(biāo)準(zhǔn)限值(5mg/L)。XRD、FTIR和SEM結(jié)果表明,砷鈣渣經(jīng)高爐礦渣-粉煤灰地聚合物膠凝材料固化,反應(yīng)體系液相環(huán)境pH13,促使砷鈣渣中的含砷礦物CaHAsO_4·3H_2O向更加穩(wěn)定的Ca_5(AsO_4)_3OH及類質(zhì)同象物Ca_5(AsO_4)_3(OH,F)轉(zhuǎn)變。同時(shí)地聚合物膠凝材料水化產(chǎn)生的網(wǎng)絡(luò)狀水化凝膠可把砷鈣渣中的各組分膠結(jié)在一起有效抑制固化體中砷的溶出�？梢�,高爐礦渣-粉煤灰地聚合物膠凝材料可作為固化含砷渣的一種潛在固結(jié)劑。
[Abstract]:The mechanism of arsenic fixation was investigated by using blast furnace slag and fly ash as raw materials of polymer cementitious material and combined with compound chemical activator to solidify arsenic calcium slag. X-ray diffraction (XRD) (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscope (SEM) were used to study the mechanism of arsenic fixation. The results show that the optimum mass ratio of solidified body is blast furnace slag powder: fly ash: arsenic calcium slag = 4: 2: 4, with 1.5% NaOH and industrial water glass compound chemical activator. The arsenic leaching concentration of the solidified body was 0.5 ~ 0.9mg / L, which was lower than the limit of hazardous waste leaching toxicity (5mg/L). The results of XRD,FTIR and SEM showed that the arsenic calcium slag was solidified by blast furnace slag and fly ash geopolymer cementitious material. The liquid phase environment pH13, of the reaction system promoted the transformation of the arsenic-bearing mineral CaHAsO_4 3H_2O from arsenic calcium slag to a more stable Ca_5 (AsO_4) _ 3OH and Ca_5 (AsO_4) _ 3 (OH,F). At the same time, the network hydration gel produced by the hydration of geopolymer cementitious materials can effectively inhibit the dissolution of arsenic from the solidified body by cementing each component of arsenic calcium residue together. Therefore, blast furnace slag-fly ash geopolymer cementitious material can be used as a potential consolidation agent for solidifying arsenic-bearing slag.
【作者單位】： 昆明理工大學(xué)環(huán)境科學(xué)與工程學(xué)院;西南林業(yè)大學(xué)理學(xué)院;昆明理工大學(xué)化學(xué)工程學(xué)院;昆明理工大學(xué)非常規(guī)冶金教育部重點(diǎn)實(shí)驗(yàn)室;
【基金】：NSFC-云南聯(lián)合基金(U1137604) 云銅校企預(yù)研基金2015YT08) 昆明理工大學(xué)引進(jìn)人才科研啟動(dòng)基金(KKSY201605021) 昆明理工大學(xué)分析測(cè)試基金(2016T20160009)項(xiàng)目
【分類號(hào)】：X705

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