Recycling water glass from wet reclamation sewage of waste sodium silicate-bonded sand
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摘要
Wet reclamation of waste sodium silicate-bonded sand produces much alkaline sewage and causes pollution. Recycling water glass from wet reclamation sewage of the waste sodium silicate-bonded sand can solve pollution issues and generate economic benefits. In this work,the wet reclamation sewage was filtered,and the filtrate was causticized with a quicklime powder to produce a lye. The effects of causticization temperature,causticization time,and the amount of quicklime powder on the causticization rate were studied. The lye was used to dissolve the silica in the filtration residue to prepare a sodium silicate solution. The effects of the mass of filtration residue,dissolution temperature,and dissolution time on sodium silicate modulus were studied. Finally,the recycled water glass was obtained by concentrating the sodium silicate solution,and the bonding strength of the recycled water glass was tested. The results showed that the causticization rate could be improved by increasing the amount of quicklime powder,causticization temperature,and causticization time,and the highest causticization rate was above 92%. Amorphous silica in the filtration residue dissolved in the lye. Increasing the amount of the filtration residue,dissolution temperature,and dissolution time could improve the sodium silicate modulus. The bonding strength of the recycled water glass was close to that of commercial water glass. The recycled water glass could be used as a substitute for the commercial water glass.
Wet reclamation of waste sodium silicate-bonded sand produces much alkaline sewage and causes pollution. Recycling water glass from wet reclamation sewage of the waste sodium silicate-bonded sand can solve pollution issues and generate economic benefits. In this work,the wet reclamation sewage was filtered,and the filtrate was causticized with a quicklime powder to produce a lye. The effects of causticization temperature,causticization time,and the amount of quicklime powder on the causticization rate were studied. The lye was used to dissolve the silica in the filtration residue to prepare a sodium silicate solution. The effects of the mass of filtration residue,dissolution temperature,and dissolution time on sodium silicate modulus were studied. Finally,the recycled water glass was obtained by concentrating the sodium silicate solution,and the bonding strength of the recycled water glass was tested. The results showed that the causticization rate could be improved by increasing the amount of quicklime powder,causticization temperature,and causticization time,and the highest causticization rate was above 92%. Amorphous silica in the filtration residue dissolved in the lye. Increasing the amount of the filtration residue,dissolution temperature,and dissolution time could improve the sodium silicate modulus. The bonding strength of the recycled water glass was close to that of commercial water glass. The recycled water glass could be used as a substitute for the commercial water glass.
Wet reclamation of waste sodium silicate-bonded sand produces much alkaline sewage and causes pollution. Recycling water glass from wet reclamation sewage of the waste sodium silicate-bonded sand can solve pollution issues and generate economic benefits. In this work,the wet reclamation sewage was filtered,and the filtrate was causticized with a quicklime powder to produce a lye. The effects of causticization temperature,causticization time,and the amount of quicklime powder on the causticization rate were studied. The lye was used to dissolve the silica in the filtration residue to prepare a sodium silicate solution. The effects of the mass of filtration residue,dissolution temperature,and dissolution time on sodium silicate modulus were studied. Finally,the recycled water glass was obtained by concentrating the sodium silicate solution,and the bonding strength of the recycled water glass was tested. The results showed that the causticization rate could be improved by increasing the amount of quicklime powder,causticization temperature,and causticization time,and the highest causticization rate was above 92%. Amorphous silica in the filtration residue dissolved in the lye. Increasing the amount of the filtration residue,dissolution temperature,and dissolution time could improve the sodium silicate modulus. The bonding strength of the recycled water glass was close to that of commercial water glass. The recycled water glass could be used as a substitute for the commercial water glass.
引文
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[2]Wang Jina,Fan Zitian.‘Freezing-mechanical’reclamation of used sodium silicate sands.International Journal of Cast Metals Research,2010,23(2):257-263.
[3]Long Wei,Fan Zitian,Li Guona.Study on application of organobentonite to wastewater disposal of wet reclaiming used sodium silicate sand.Foundry,2012,61(12):1397-1400,1404.(In Chinese)
[4]Siddique R,Singh G,Singh M.Recycle option for metallurgical by-product(spent foundry sand)in green concrete for sustainable construction.Journal of Cleaner Production,2018,172:1111-1120.
[5]Yazoghli-Marzouk O,Vulcano-Greullet N,Cantegrit L,et al.Recycling foundry sand in road construction-field assessment.Construction&Building Materials,2014,61:69-78.
[6]Singh G,Siddique R.Effect of waste foundry sand(WFS)as partial replacement of sand on the strength,ultrasonic pulse velocity and permeability of concrete.Construction&Building Materials,2012,26(1):416-422.
[7]Wang Huafang,Fan Zitian,Yu Shaoqiang,et al.Wet reclamation of sodium silicate used sand and biological treatment of its wastewater by Nitzschia pales.China Foundry,2012,9(1):34-38.
[8]Wang Lichi,Jiang Wenming,Liu Fuchu,et al.Investigation of parameters and mechanism of ultrasound-assisted wet reclamation of waste sodium silicate sands.International Journal of Cast Metals Research,2018,31:169-176.
[9]Dańko J,Kamińska J,Skrzyńsk M.Reclamation of spent mouldingsands with inorganic binders in the vibratory reclaimerregmas.Archives of Metallurgy&Materials,2013,58(3):993-996.
[10]Xing Wanting,Liu Yue,Xin Qibin,et al.Research progress and application of reclamation for used sand.Foundry,2015,64(8):735-739.(In Chinese)
[11]He Fuqiang,Fan Zitian,Wang Jina.Study of sewage treatment in wet reclamation process by used sodium silicate sand.Foundry Technology,2008,29:1473-1476.(In Chinese)
[12]Ma Huilong,Li Shuzhen.A system for circle use of both wet recovery of ester cured water glass old sand and sewage.China Foundry Machinery&Technology,2011,36-38.(In Chinese)
[13]Wen Jia,Dong Haoran,Zeng Guangming.Application of zeolite in removing salinity/sodicity from wastewater:A review of mechanisms,challenges and opportunities.Journal of Cleaner Production,2018,197:1435-1446.
[14]Zhu Ganyu,Li Huiquan,Lin Rongyi,et al.Synthesis of superfine calcium carbonate during causticization in highly alkaline system for utilization of high-alumina fly ash.Hydrometallurgy,2016,165:282-289.
[15]Yuan Bo,Wang Jing,Cai Wei,et al.Effects of temperature on conversion of Li2CO3 to LiOH in Ca(OH)2 suspension.Particuology,2017,34:97-102.
[2]Wang Jina,Fan Zitian.‘Freezing-mechanical’reclamation of used sodium silicate sands.International Journal of Cast Metals Research,2010,23(2):257-263.
[3]Long Wei,Fan Zitian,Li Guona.Study on application of organobentonite to wastewater disposal of wet reclaiming used sodium silicate sand.Foundry,2012,61(12):1397-1400,1404.(In Chinese)
[4]Siddique R,Singh G,Singh M.Recycle option for metallurgical by-product(spent foundry sand)in green concrete for sustainable construction.Journal of Cleaner Production,2018,172:1111-1120.
[5]Yazoghli-Marzouk O,Vulcano-Greullet N,Cantegrit L,et al.Recycling foundry sand in road construction-field assessment.Construction&Building Materials,2014,61:69-78.
[6]Singh G,Siddique R.Effect of waste foundry sand(WFS)as partial replacement of sand on the strength,ultrasonic pulse velocity and permeability of concrete.Construction&Building Materials,2012,26(1):416-422.
[7]Wang Huafang,Fan Zitian,Yu Shaoqiang,et al.Wet reclamation of sodium silicate used sand and biological treatment of its wastewater by Nitzschia pales.China Foundry,2012,9(1):34-38.
[8]Wang Lichi,Jiang Wenming,Liu Fuchu,et al.Investigation of parameters and mechanism of ultrasound-assisted wet reclamation of waste sodium silicate sands.International Journal of Cast Metals Research,2018,31:169-176.
[9]Dańko J,Kamińska J,Skrzyńsk M.Reclamation of spent mouldingsands with inorganic binders in the vibratory reclaimerregmas.Archives of Metallurgy&Materials,2013,58(3):993-996.
[10]Xing Wanting,Liu Yue,Xin Qibin,et al.Research progress and application of reclamation for used sand.Foundry,2015,64(8):735-739.(In Chinese)
[11]He Fuqiang,Fan Zitian,Wang Jina.Study of sewage treatment in wet reclamation process by used sodium silicate sand.Foundry Technology,2008,29:1473-1476.(In Chinese)
[12]Ma Huilong,Li Shuzhen.A system for circle use of both wet recovery of ester cured water glass old sand and sewage.China Foundry Machinery&Technology,2011,36-38.(In Chinese)
[13]Wen Jia,Dong Haoran,Zeng Guangming.Application of zeolite in removing salinity/sodicity from wastewater:A review of mechanisms,challenges and opportunities.Journal of Cleaner Production,2018,197:1435-1446.
[14]Zhu Ganyu,Li Huiquan,Lin Rongyi,et al.Synthesis of superfine calcium carbonate during causticization in highly alkaline system for utilization of high-alumina fly ash.Hydrometallurgy,2016,165:282-289.
[15]Yuan Bo,Wang Jing,Cai Wei,et al.Effects of temperature on conversion of Li2CO3 to LiOH in Ca(OH)2 suspension.Particuology,2017,34:97-102.