本文選題：燒結(jié)灰 + 瓦斯灰�。� 參考：《湘潭大學(xué)》2015年碩士論文

【摘要】：含鐵塵泥作為鋼鐵固體廢棄物的主要來源之一,主要包括燒結(jié)機(jī)頭電除塵灰(簡稱燒結(jié)灰)和瓦斯灰。燒結(jié)灰來源于鋼鐵生產(chǎn)燒結(jié)工藝過程中電除塵器的煙氣收集。燒結(jié)灰中化學(xué)成分復(fù)雜,除鐵元素之外,還含鉀、銅、鋅、鉛等有害元素;瓦斯灰來源于高爐冶煉過程中重力除塵所收集的顆粒較粗的粉塵,瓦斯灰的化學(xué)成分也比較復(fù)雜,除鐵之外還含有大量未燃燒完全的炭、鉀、銅、鉛、鉍、鋅、鎘和砷等有害元素。本文針對國內(nèi)部分鋼鐵企業(yè)生產(chǎn)過程的燒結(jié)灰和高爐瓦斯灰中含有較高KCl資源的特點,以其為原料,在分析其理化性質(zhì)的基礎(chǔ)上,開發(fā)了水洗脫鉀?固液分離?除雜與脫色?固液分離?真空蒸發(fā)?冷卻結(jié)晶的回收KCl工藝路線。該技術(shù)不僅能解決鋼鐵企業(yè)燒結(jié)機(jī)頭電除塵灰循環(huán)利用過程中鉀、鈉等元素富集帶來的危害,而且也為我國開辟了一條從鋼鐵冶金固廢中回收利用KCl資源的新途徑。燒結(jié)灰及瓦斯灰的理化特性分析表明,包頭鋼鐵有限責(zé)任公司(以下簡稱包鋼)燒結(jié)灰中KCl含量達(dá)12.09%,湖南華菱湘潭鋼鐵有限公司(以下簡稱湘鋼)燒結(jié)灰中KCl含量達(dá)11.90%,唐山鋼鐵集團(tuán)有限責(zé)任公司(以下簡稱唐鋼)瓦斯灰中KCl含量達(dá)39.58%;包鋼燒結(jié)灰、湘鋼燒結(jié)灰以及唐鋼瓦斯灰的中位粒徑分別為4.21μm、23.84μm、6.63μm,比表面積分別為0.2 m2/g、15 m2/g、0.36 m2/g。在包鋼燒結(jié)灰回收氯化鉀工藝研究中,研究了水洗脫鉀后的含鉀溶液中氯化鉀的回收工藝:在初始沸騰溫度為120℃、末沸騰溫度為160℃的范圍內(nèi),以轉(zhuǎn)速為50~60 r/min進(jìn)行真空旋轉(zhuǎn)蒸發(fā)結(jié)晶,當(dāng)蒸發(fā)體積濃縮比為10.71時,所回收的氯化鉀產(chǎn)品含量高達(dá)97.24%,回收率為65.25%,達(dá)到工農(nóng)業(yè)用氯化鉀技術(shù)I類一等品(GB6549-2011)要求,產(chǎn)品粒度分布比較均勻,質(zhì)量較好。在湘鋼燒結(jié)灰回收氯化鉀工藝研究中,研究了水洗脫鉀后的含鉀溶液中氯化鉀的回收工藝:在末沸騰溫度為140℃、150℃、160℃和170℃時,真空旋轉(zhuǎn)蒸發(fā)結(jié)晶工藝所回收的氯化鉀產(chǎn)品平均含量高達(dá)95.68%,均回收率81.87%,均達(dá)到工農(nóng)業(yè)用氯化鉀技術(shù)I類一等品(GB6549-2011)要求,晶體粒度分布均勻,質(zhì)量較好。在唐鋼瓦斯灰回收氯化鉀工藝研究中,研究了水洗脫鉀后的含鉀溶液中氯化鉀的回收工藝:在0℃、5℃和10℃下恒溫冷卻,從水洗脫鉀后的含鉀溶液中所回收的氯化鉀產(chǎn)品平均含量高達(dá)96.98%,回收率為74.46%,達(dá)到工農(nóng)業(yè)用氯化鉀技術(shù)I類一等品以及優(yōu)等品(GB6549-2011)要求,通過激光粒度分析儀以及掃描電鏡對產(chǎn)品進(jìn)行分析可知,粒度分布均勻,質(zhì)量較好。
[Abstract]:As one of the main sources of iron and steel solid waste, iron dust sludge mainly includes electric dust remover (sintering ash) and gas ash. Sintered ash comes from flue gas collection of electrostatic precipitator in sintering process of iron and steel production. The chemical composition of sinter ash is complex, besides iron element, it also contains harmful elements, such as potassium, copper, zinc, lead, etc. The gas ash comes from the coarse particles of dust collected by gravity dust collection in blast furnace smelting process, and the chemical composition of gas ash is also quite complex. In addition to iron, there are many harmful elements, such as carbon, potassium, copper, lead, bismuth, zinc, cadmium and arsenic. Aiming at the characteristics of high KCl resource in sintering ash and blast furnace gas ash of some iron and steel enterprises in China, based on the analysis of its physical and chemical properties, water eluting potassium was developed in this paper. Solid-liquid separation? Removing impurities and decolorizing? Solid-liquid separation? Vacuum evaporation? Cooling crystallization of the recovery of KCl process route. This technology can not only solve the harm caused by the enrichment of potassium, sodium and other elements in the recycling process of precipitating ash from sintering machine head of iron and steel enterprises, but also open up a new way to recover and utilize KCl resources from iron and steel metallurgical solid waste in China. The analysis of the physical and chemical properties of sinter ash and gas ash shows that, Baotou Iron and Steel Co., Ltd (Baotou Iron and Steel Co., Ltd) has a KCl content of 12.09, Hunan Valin Xiangtan Iron and Steel Co., Ltd (hereinafter referred to as Xianggang) has a KCl content of 11.90 and Tangshan Iron and Steel Group Co., Ltd. The content of KCl in gas ash is 39.58. The average particle size of sintered ash and gas ash in Xiangtan Iron and Steel Company is 4.21 渭 m, 23.84 渭 m and 6.63 渭 m, respectively, and the specific surface area is 0.2 m2 / g ~ (-1) 15 m ~ (2 / g) / g ~ (0.36) m ~ (2 / g), respectively. In the process of recovering potassium chloride from sintering ash of Baotou Iron and Steel Co., the recovery process of potassium chloride in potassium containing solution after water elution was studied: the initial boiling temperature was 120 鈩，

本文編號：1910663