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为解决石灰烧结法配钙量高、渣量大和氧化铝回收率低等问题,提出了低钙石灰烧结法从脱硅粉煤灰提取氧化铝的新工艺,并研究了不同配钙比和碱铝比对熟料烧结行为、粉化性能和氧化铝浸出性能的影响。结果表明:低钙石灰烧结法处理粉煤灰烧结熟料主要物相组成为12CaO·7Al_2O3和γ-2CaO·SiO2,并含有少量CaO·Al_2O3、2Na_2O·3CaO·5Al_2O3、2CaO·Al_2O3·SiO2和β-2CaO·SiO2;提高钙铝比有助于2CaO·Al_2O3·SiO2向12CaO·7Al_2O3和γ-2CaO·SiO2的转化,从而提高氧化铝浸出性能和熟料粉化性能;提高碱铝比促进2CaO·Al2 O3·SiO2向12CaO·7Al_2O3和2Na_2O·3CaO·5Al2 O3的转化,有利于提高氧化铝的浸出性能,但过高的碱铝比增加熟料中的β-2CaO·SiO2含量,从而降低熟料粉化性能;在1 350℃烧结1 h的条件下,当钙铝比为1.20、碱铝比为0.15时,脱硅粉煤灰烧结熟料氧化铝浸出率达到90%左右。
Abstract：To address large amount of calcium addition and residue and low alumina recovery of lime sinter process,a new process to extract alumina from desiliconized fly ash by low-calcium lime sinter process was proposed Effects of different ratios of calcium oxide to alumina(C/A) and alkali to alumina(N/A) on sintering behavior,pulverization and alumina leaching performance of clinker were investigated The results show that main phases of fly ash clinkers by low-calcium lime sinter process are 12 CaO·7 Al3 O3 and γ-2 CaO·SiO2,with some CaO·Al2 O3,2 Na2 O·3 CaO·5 Al2 O3,2 CaO·Al2 O3·Si2 and β-2 CaO·SiO2.Increasing C/A ratio is helpful for conversion of 2 CaO·Al2 O3·SiO2 to 12 CaO·7 Al2 O3 and γ-2 CaO·SiO2,which improves alumina leaching and pulverization performance of clinker.Increasing N/A ratio can promote conversion of 2 CaO·Al2 O3·SiO2 to 12 CaO·7 Al2 O3 and 2 Na2 O·3 CaO·5 Al2 O3,which improves leaching performance of alumina,but over N/A ratio rises β-2 CaO·SiO2 content in clinker and reduces pulverization performance of clinker.Alumina leaching efficiency of clinker sintered at 1 350℃ for1 h is 90% with C/A=1.20 and N/A=0.15,and clinker possesses a good pulverization.
[1]石川.脱硅粉煤灰碱石灰烧结法熟料配方优化研究[D].沈阳:东北大学,2014.SHI C.Clinker formula optimization of desilicated fly ash by soda-lime sinter process[D].Shenyang:Northeastern University,2014.
[2]PENGTHAMKEERATI P,KRAEWONG W,MEESUK L.Green synthesis of nano-silicalite-1:Biomass fly ash as a silica source and mother liquid recycling[J].Environmental Progress&Sustainable Energy,2015,34(1):188-193.
[3]HE Y,LUO Q M,HU H L.Situation analysis and countermeasures of China;s fly ash pollution prevention and control[J].Procedia Environmental Sciences,2012,16:690-696.
[4]郭昭华.粉煤灰“一步酸溶法”提取氧化铝工艺技术及工业化发展研究[J].煤炭工程,2015,47(7):5-8.GUO Z H.Study on process technology and industrialization of alumina extraction by fly ash"one step acid dissolving method"[J].Coal Engineering,2015,47(7):5-8.
[5]BAI G H,QIAO Y H,SHEN B,et al.Thermal decomposition of coal fly ash by concentrated sulfuric acid and alumina extraction process based on it[J].Fuel Processing Technology,2011,92:1213-1219.
[6]王焱,江熠,姜传宁,等.高铝粉煤灰钙矿相转化行为研究[J].有色金属(冶炼部分),2020(3):85-90.WANG Y,JIANG Y,JIANG C N,et al.Phase transformation behavior of calcium-bearing minerals in high-alumina fly ash[J].Nonferrous Metals(Extractive Metallurgy),2020(3):85-90.
[7]BAI G H,TENG W,WANG X G,et al.Alkali desilicated coal fly ash as substitute of bauxite in limesoda sintering process for aluminum production[J].Transactions of Nonferrous Metals Society of China,2010,20(S1):169-175.
[8]王波,于海燕,孙会兰,等.物料配比对铝酸钙炉渣浸出和自粉性能的影响[J].东北大学学报(自然科学版),2008,29(11):1593-1596.WANG B,YU H Y,SUN H L,et al.Effect of raw material mixture ratio on leaching and selfdisintegrating behavior of calcium aluminate slag[J].Journal of Northeastern University(Natural Science),2008,29(11):1593-1596.
[9]赵喆,孙培梅,薛冰,等.石灰石烧结法从粉煤灰提取氧化铝的研究[J].金属材料与冶金工程,2008,36(2):16-18.ZHAO Z,SUN P M,XUE B,et al.Study on the influence of sintering condition in alumina leaching process in extracting alumina from fly ash by the way of limestone sinter[J].Metal Materials and Metallurgy Engineering,2008,36(2):16-18.
[10]苏双青,马鸿文,邹丹.高铝粉煤灰两步碱溶法提取氢氧化铝的实验研究[J].矿物学报,2010,30(增刊1):176.SU S Q,MA H W,ZOU D.Study on extraction of alumina hydroxide from high-alumina fly ash by two-step alkali solution[J].Journal of Minerals,2010,30(S1):176.
[11]蒋训雄,蒋开喜,汪胜东,等.酸碱联合综合回收高铝粉煤灰中氧化铝和氧化硅[J].有色金属(冶炼部分),2019(9):28-32.JIANG X X,JIANG K X,WANG S D,et al.Recovery of alumina and silicon oxide from high-alumina fly ash by acid and alkali combination method[J].Nonferrous Metals(Extractive Metallurgy),2019(9):28-32.
[12]吕子剑.粉煤灰提取氧化铝研究进展[J].轻金属,2010(7):12-14.LV Z J.Research progress in extraction of alumina from fly ash[J].Light Metals,2010(7):1 2-14.
[13]于海燕,潘晓林,王波,等.采用低铝硅比铝资源干法或半干法生产氧化铝的方法:CN102583475A[P].2012-07-18.YU H Y,PAN X L,WANG B,et al.Production of alumina by dry or semi dry process with low alumina silica ratio:CN102583475A[P].2012-0 7-18.
[14]ZHOU X,LIU D,BU H L,et al.XRD-based quantitative analysis of clay minerals using reference intensity ratios,mineral intensity factors,rietveld,and full pattern summation methods:A critical review[J].Solid Earth Sciences,2018,3(1):16-29.
[15]FENG X J,LONG S Z.Investigation of the effect of minor ions on the stability ofβ-C_2S and the mechanism of stabilization[J].Cement and Concrete Research,1986,16(4):587-601.
[16]田勇攀,潘晓林,于海燕,等.Na_4Ca_3(AlO_2)_(10)的合成和浸出行为[J].过程工程学报,2016,16(2):228-232.TIAN Y P,PAN X L,YU H Y,et al.Synthesis and leaching behavior of Na_4 Ca_3(AlO_2)_(10)[J].The Chinese Journal of Process Engineering,2016,16(2):228-232.
[17]张迪,于海燕,潘晓林,等.氧化铝赋存形式对低钙烧结熟料矿相转化的影响[J].中国有色金属学报,2015,25(12):3497-3504.ZHANG D,YU H Y,PAN X L,et al.Effect of alumina existing formation on mineralogical transformation of sintered clinker with low lime dosage[J].The Chinese Journal of Nonferrous Metals,2015,25(12):3497-3504.
[18]潘晓林,于海燕,毕诗文,等.一种利用硅酸二钙碱法合成硅酸钙的方法:CN107857276B[P].2019-09-10.PAN X L,YU H Y,BI S W,et al.A method of preparing calcium silicate by alkali-thermal synthesis fromdicalcium silicate:CN107857276B[P].201 9-09-10.
基本信息:
中图分类号:TQ133.1;TQ536.4
引用信息:
[1]杨再明,吕中阳,潘晓林,等.低钙石灰烧结法处理粉煤灰高效提取氧化铝研究[J].有色金属(冶炼部分),2020(09):64-68+96.
基金信息:
国家重点研发计划项目（2018YFC1901903）; 国家自然科学基金资助项目（51674075）
2020-09-12
2020-09-12