發(fā)布時間：2018-05-31 04:56

  本文選題：粉煤灰 + 礦物學(xué)特征�。� 參考：《西安建筑科技大學(xué)》2017年碩士論文

【摘要】：我國作為煤炭大國,粉煤灰產(chǎn)量一直居高不下,2016年我國粉煤灰產(chǎn)量約達(dá)6億噸,加上歷年來堆存的,截止2016年底,粉煤灰積存量已達(dá)30億噸。粉煤灰的應(yīng)用領(lǐng)域雖然很多,但是應(yīng)用量卻十分有限。針對這一應(yīng)用難題,對粉煤灰進行礦物學(xué)分析和磁性礦物分選試驗,并對其中的礦物相含量進行測定,為粉煤灰的應(yīng)用提供理論基礎(chǔ)。研究結(jié)果表明:粉煤灰中各礦物相的平均粒徑分別為玻璃體25.70μm,石英35.9μm,莫來石19.8μm,磁鐵礦17.1μm,赤鐵礦21.4μm,f-CaO 18.5μm。粉煤灰中玻璃體含量53.99%,石英含量25.53%,莫來石含量17.98%,磁鐵礦含量1.72%,赤鐵礦含量0.20%,f-CaO含量0.15%;粉煤灰中磁鐵礦的單體解離度為28.73%,赤鐵礦的單體解離度為15.48%,玻璃體的單體解離度為57.65%,其中粉煤灰中的玻璃體多以單體或與其他礦物呈兩相連生關(guān)系存在;粉煤灰的顆粒密度分布范圍主要集中在2.6~3.2g/cm3。粉煤灰中各種礦物相在堿、酸溶液中的溶解反應(yīng)特征,采用堿-酸(NaOH-HNO3)兩段溶解來測定粉煤灰中玻璃體含量的化學(xué)物相分析法。粉煤灰中莫來石、石英、磁鐵礦、赤鐵礦和未燃盡碳粒,在堿、酸溶液中是穩(wěn)定相;玻璃體和f-CaO在堿溶液中反應(yīng)形成凝膠,凝膠在酸溶液中完全溶解,表現(xiàn)為溶解過程的質(zhì)量縮減率,減去f-CaO含量即為玻璃體含量。采用Rietveld全譜擬合法測定粉煤灰中磁性礦物的含量。測得粉煤灰原料中磁性礦物含量為2.05%;將粉煤灰分成不同粒級后,磁性礦物含量隨粒級的增大而增多,+106μm粒級中磁性礦物含量為6.42%,是-30μm粒級的11.46倍,是原料的3.13倍,由各粒級中磁性礦物的富集系數(shù)知,粉煤灰中磁性礦物主要在粗粒級中富集,隨著粒級的增大,富集系數(shù)也增大。粉煤灰由O-Sepa選粉機,氣力分選得粗粉和細(xì)粉兩種產(chǎn)品。文中選用3種風(fēng)量進行氣力分選,分別為Q1、Q2和Q3。得到三種中位分離徑分別為22μm、30μm和35μm,應(yīng)用牛頓分離效率對氣力分選效果進行表征。Q1的牛頓分離效率為75.46%,Q2為80.35%,Q3為85.8%,三種風(fēng)量下,Q3的分選效果較好。當(dāng)進風(fēng)量為Q3下,粗粉中磁性礦物含量為3.07%,玻璃體含量58.83%,細(xì)粉中磁性礦物含量較少為0.23%,玻璃體含量57.22%,氣力分選產(chǎn)品粗粉中磁性礦物含量是細(xì)粉的13.35倍,粉煤灰經(jīng)氣力分選后,磁性礦物在粗粉中富集。
[Abstract]:As a big country of coal, the production of fly ash in China has been high all the time. In 2016, the output of fly ash in China has reached about 600 million tons, plus the accumulated amount of fly ash has reached 3 billion tons by the end of 2016. Although the application field of fly ash is many, but the application quantity is very limited. In view of this problem, the mineralogical analysis and magnetic mineral separation test of fly ash are carried out, and the content of mineral phase is determined, which provides a theoretical basis for the application of fly ash. The results show that the average particle sizes of each mineral phase in fly ash are vitreous 25.70 渭 m, quartz 35.9 渭 m, mullite 19.8 渭 m, magnetite 17.1 渭 m, hematite 21.4 渭 m, f-CaO 18.5 渭 m. The vitreous content in fly ash is 53.99, quartz 25.53, mullite 17.98, magnetite 1.72, hematite 0.20 and f-CaO 0.15.The monomer dissociation degree of magnetite in fly ash is 28.73, the monomer dissociation degree of hematite is 15.48, the monomer dissociation of vitreous is 15.48. The degree of vitreous in fly ash is 57.65. The vitreous body in fly ash exists in two contiguous relationship with other minerals. The particle density distribution of fly ash is mainly in the range of 2.6 ~ 3.2g / cm ~ (-3). The characteristics of dissolution reaction of various mineral phases in fly ash in alkali and acid solution. The chemical phase analysis method for the determination of vitreous content in fly ash by alkali-acid NaOH-HNO _ 3 two-stage dissolution is described. In fly ash, mullite, quartz, magnetite, hematite and unburned carbon particles are stable phases in alkali and acid solutions. Vitreous and f-CaO react in alkali solutions to form gels, which are completely dissolved in acid solutions. The content of vitreous is reduced by subtracting the content of f-CaO. The content of magnetic minerals in fly ash was determined by Rietveld full spectrum fitting method. The content of magnetic minerals in the raw material of fly ash is 2.05. The content of magnetic minerals in 106 渭 m particles is 6.42, 11.46 times that of -30 渭 m and 3.13 times of that of raw materials. According to the enrichment coefficient of magnetic minerals in each grain grade, the magnetic minerals in fly ash are mainly enriched in coarse grained grade, and the enrichment coefficient increases with the increase of particle size. Fly ash by O-Sepa separator, pneumatic separation of coarse powder and fine powder two products. In this paper, three kinds of air volume are selected for pneumatic separation, which are Q1, Q2 and Q3, respectively. The three median separation diameters were 22 渭 m 30 渭 m and 35 渭 m, respectively. The Newtonian separation efficiency of Q1 was 75.46 and 80.35, respectively. When the air volume is Q3, the content of magnetic minerals in coarse powder is 3.07, the content of vitreous is 58.83, the content of magnetic mineral in fine powder is less 0.23 and the content of vitreous is 57.22. The content of magnetic mineral in coarse powder of pneumatic separation product is 13.35 times that of fine powder. Magnetic minerals are enriched in coarse powder.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TQ536.4;TD91

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本文編號：1958373