海淤泥烧结中的物理化学变化及机理分析
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摘要
本文以江苏省连云港海淤泥为原料,研究其烧结过程中可溶性盐特别是氯元素含量的变化情况。结果表明:海淤泥中含量较高的离子为Cl~-、Na~+和SiO_4~-,当温度高于600℃时Na~+含量急剧减小,到1000℃时仅剩0.1‰;当温度高于600℃时Cl~-含量也急剧减少,到900℃时几乎降为零。对1000℃烧结的海淤泥进行X射线荧光光谱(XRF)测试表明,氯元素已经消失,机理可能是以氯化氢状态逸出。研究发现烧结温度在1000℃以上时可溶性盐含量极低,能够消除对海淤泥烧结建材的顾虑。
Changes of contents of soluble salts in the sintering process,especially chlorine ion,were studied by taking Lianyungang sea silt as an example.Results indicate that the content of chlorine ion,sodium cation and sulfate ion are relatively high in sea silt.Na~+ content decreases dramatically when the temperature is higher than 600℃ and reaches only 0.1 ‰ for temperature of 1000℃.Cl~- content decreases sharply when the temperature is higher than 600℃ and almost disappeared at 900℃.XRF test indicates that element of chlorine has disappeared from sea silt at 1000℃,and the possible mechanism might be efflux as hydrogen chloride.Low contents of soluble salts in sea silt when the sintering temperature is over 1000℃ can eliminate the concerns of applying sintered sea silt as construction material.
Changes of contents of soluble salts in the sintering process,especially chlorine ion,were studied by taking Lianyungang sea silt as an example.Results indicate that the content of chlorine ion,sodium cation and sulfate ion are relatively high in sea silt.Na~+ content decreases dramatically when the temperature is higher than 600℃ and reaches only 0.1 ‰ for temperature of 1000℃.Cl~- content decreases sharply when the temperature is higher than 600℃ and almost disappeared at 900℃.XRF test indicates that element of chlorine has disappeared from sea silt at 1000℃,and the possible mechanism might be efflux as hydrogen chloride.Low contents of soluble salts in sea silt when the sintering temperature is over 1000℃ can eliminate the concerns of applying sintered sea silt as construction material.
引文
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[3]李明东,丛新,张志峰.资源化利用废泥生产建材的现状与展望[J].环境工程,2016,4:116~121.
[4]李明东,丛新,张志峰,张志卿,朱文谨,田安国.吹填淤泥地基加固方法研究:现状与展望[J].江苏建筑,2016,3:86~88+99.
[5]王小山,屠浩驰,吴宗良,等.宁波市河道淤泥与建筑渣土建材化利用的基础研究[J].材料科学与工程学报,2011,29(2):282~285,300.
[6]张志峰,李明东,田安国,等.连云港渣土淤泥的性质和烧结建材可行性[J].江苏建筑,2015,(3):104~107.
[7]万锋,田安国.海淤泥资源化利用相关技术研究分析[J].砖瓦,2014,(5):11~14.
[8]Salim WSW,Sadikon SF,Salleh SM,et al.Assessment of Physical Properties and Chemical Composition of Kuala Perlis Dredged Marine Sediment as a Potential Brick Material[C].Business,Engineering and Industrial Applications(ISBEIA),2012IEEE Symposium on,2012,509~512.
[9]Yan HD,Lin MH.The Experimental Study and Analysis on the Scumming Degree of Sea Mud Sintered Perforated Brick with Industrial Waste Slag[J].Advanced Materials Research,2012,1616(450):115~121.
[10]周敏.厦门海泥烧结砖泛霜试验研究[J].福建建材,2010(3):15~16.
[11]Mezencevova A,Yeboah NN,Burns SE,et al.Utilization of Savannah Harbor River Sediment as the Primary Raw Material in Production of Fired Brick[J].Journal of Environmental Management,2012,113:128~136.
[12]A DAH,Daizo I,Satoshi K,et al.Water Purification with Sintered Porous Materials Fabricated at 400Degrees C From Sea Bottom Sediments[J].Journal of Environmental Sciences,2008,20(2):172~176.
[13]顾炳伟,田安国,胡杰,等.海淤的特性及其对制砖工艺的影响[J].新型建筑材料,2008,(6):5~8.
[14]李明东,田安国,胡杰.一种海淤泥脱水除盐的装置[P].中国.CN202322575U,2012-07-11.
[15]高明,田安国,李明东,等.海淤泥制砖脱水除盐关键技术实验研究[J].新型建筑材料,2013,(2):35~37.
[16]杨国铨.食盐、粘土烧结法制造盐酸的反应机理[J].佛山师专学报,1984,(2):64~65.