亚熔盐法处理铝土矿工艺的赤泥常压脱碱
Dealkalization of Red Mud Generated in Alumina Production by Sub-molten Salt Process under Atmospheric Pressure
查看参考文献25篇
文摘
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研究了在低温常压下亚熔盐法处理铝土矿所得赤泥的脱碱过程, 考察了反应温度、CaO添加量、初始溶液 Na_2O浓度及反应时间等因素对反应过程的影响.结果表明, 随CaO用量增加、反应温度提高和反应时间延长, 终赤泥中Na_2O含量降低, 初始碱浓度过高或过低都不利于Na_2O溶出.在95℃、NaOH溶液/干赤泥质量比6、CaO/原赤泥质量比0.22、初始溶液Na_2O浓度60 g/L、反应时间10 h的条件下, 终赤泥中Na_2O含量可降至1.41%, 钠/硅质量比为0.07.反应后生成了硅酸钙相, 赤泥由棒状晶体转变成了绒球状的薄片聚集体. |
其他语种文摘
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The dealkalization of red mud from sub-molten salt process under atmospheric pressure and low temperature was investigated. The effects of temperature, CaO addition, Na_2O concentration of solution and time on the process were examined. The experimental results indicated that the content of Na_2O in the final red mud decreased with the increase of CaO addition, reaction temperature and reaction time, but not so as to the initial concentration of Na_2O in the NaOH solution, and it could be as low as 1.41%while mass ratio of Na_2O to SiO_2 was decreased to 0.07 when dealkalizing in 60 g/L Na_2O solution with mass ratio of CaO to red mud 0.22 at 95℃for 10 h. After leaching under the above conditions, the new phase of calcium silicate formed, and the morphology of the red mud changed from rod-like crystals to fluffy agglomerate with flakes. |
来源
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过程工程学报
,2010,10(3):470-475 【核心库】
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关键词
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亚熔盐
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赤泥
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常压
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脱碱
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氧化钠
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地址
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湿法冶金清洁生产技术国家工程实验室, 中国科学院绿色过程与工程重点实验室, 北京, 100190
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语种
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中文 |
文献类型
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研究性论文 |
ISSN
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1009-606X |
学科
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化学工业 |
基金
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国家973计划
;
国家“十一五”科技支撑计划项目
;
中国科学院知识创新工程重要方向项目
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文献收藏号
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CSCD:3912423
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