發(fā)布時間：2018-01-28 10:44

  本文關(guān)鍵詞： 垃圾焚燒 飛灰 熱處理 重金屬 穩(wěn)固化　出處：《化工進(jìn)展》2017年09期 　論文類型：期刊論文

【摘要】：向垃圾焚燒飛灰(MSWI FA)中分別添加硅灰、硅溶膠、石英砂與一定比例的水,混合均勻并進(jìn)行熱處理。研究了添加物種類、熱處理溫度對垃圾焚燒飛灰中重金屬浸出特性的影響,分析了飛灰熱處理過程中重金屬化學(xué)形態(tài)、晶體結(jié)構(gòu)和微觀形貌的變化。結(jié)果表明:熱處理過程中,硅灰和硅膠與飛灰中的鈣基物質(zhì)反應(yīng)生成CaSiO_3、Ca_2SiO_4、Ca_3SiO_4Cl_2、Ca_3Fe_2(SiO_4)3以及氫氧硅磷灰石等硅酸鹽相,轉(zhuǎn)變了重金屬的化學(xué)形態(tài),將重金屬穩(wěn)固在硅酸鹽晶格中,降低了飛灰的浸出毒性;在硅灰添加量為10%或JN-40硅膠添加量25%,熱處理溫度600℃條件下,熱處理1h后,飛灰中Pb的浸出濃度由11.91mg/L分別降至0.79mg/L和0.78mg/L,Cd的浸出濃度由3.18mg/L分別降至0.09mg/L和0.10mg/L;熱處理過程中Cr的浸出濃度有所上升但未超出生活垃圾填埋場控制標(biāo)準(zhǔn)。
[Abstract]:Silica fume, silica sol, quartz sand and a certain proportion of water were added to MSFAWI to incinerate MSWI, and the mixture was homogenized and heat treated. The effect of heat treatment temperature on the leaching characteristics of heavy metals in fly ash from MSW incineration was studied. The changes of chemical morphology, crystal structure and microstructure of heavy metals in fly ash during heat treatment were analyzed. Silica fume and silica gel react with calcium based substances in fly ash to form CaSiOs, Ca2SiOs, Ca2SiOs, Ca3SiO4Cl2. The chemical forms of heavy metals were changed in the silicate phases such as Ca_3Fe_2(SiO_4)3 and hydroxysilicate apatite. The heavy metals were stabilized in silicate lattice and the leaching toxicity of fly ash was reduced. When the amount of silica fume is 10% or the amount of JN-40 silica gel is 25%, the heat treatment temperature is 600 鈩，

本文編號：1470533