排序方式: 共有28条查询结果,搜索用时 15 毫秒
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钾长石-硫酸钙-碳酸钙热分解体系的再探索 总被引:6,自引:4,他引:6
对钾长石-硫酸钙-碳酸钙体系提钾反应进行了热力学计算,系统研究了物料配比、焙烧温度、反应时间和Na2SO4添加量对热分解体系的影响,最后得出物料摩尔配比为n(钾长石):n(CaSO4):n(CaCO3)=1:1:14,在1423K温度下反应2h,钾长石中钾溶出率为92.02%.当Na2SO4添加量为2.94%时,反应温度可降为1273K,此时钾溶出率可达92%~94%.对焙烧产物进行了XRD分析,得出其主要物相为:K2SO4、3CaO·Al2O3和2CaO·SiO2,与物料摩尔配比1:1:14所确定化学反应的产物相吻合. 相似文献
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电梯限速器和安全钳维护保养是电梯日常维护保养的重要项目,其联动试验是检验中的必检项目.电梯限速器和安全钳的动作试验常常称为限速器安全钳联动试验.其中限速器属于动作触发机构,安全钳属于动作执行机构. 相似文献
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The carbonaceous adsorbent was prepared from mixtures of dewatered sludge and sawdust with enhanced ZnCl2 chemical activation.Characteristics of the adsorbent were studied using scanning electron microscope(SEM) ,Fourier transform infrared spectroscopy(FT-IR) ,and adsorption of nitrogen.The surface analysis showed that the carbonaceous adsorbent had good specific surface and porosity(394 m 2 ·g-1of BET surface,0.12 and 0.10 ml·g-1of microporous and mesoporous volume,respectively) .The oxygen functional groups such as OH,C O and C O were found on the surface by FTIR and XPS(X-ray photoelectron spectroscopy) .The adsorption of elemental mercury(Hg0) on the carbonaceous adsorbent was studied in a fixed bed reactor.The dynamic adsorption capacity of carbonaceous adsorbent increased with influent mercury concentration,from 23.6μg·g-1at 12.58μg·m-3to 87.9μg·g-1at 72.50μg·m-3,and decreased as the adsorption temperature increased,from 246 μg·g-1 at 25°C to 61.3μg·g-1 at 140°C,when dry nitrogen was used as the carrier gas.The carbonaceous adsorbent presented higher dynamic adsorption capacity than activated carbon,which was 81.2μg·g-1and 53.8μg·g-1respectively.The adsorption data were fitted to the Langmuir adsorption model.The physical and chemical adsorption were identified on the adsorbent. 相似文献
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一种高温复合固硫剂的研制及机理分析 总被引:4,自引:0,他引:4
对自行研制的一种高温复合固硫剂进行了燃煤高温固硫试验。结果表明:在1200℃的条件下,对实验用无烟煤(含硫量0.74%)和烟煤(含硫量0.659%)燃烧20min,其高温固硫率分别高达75%、67%,较相同条件下的普通钙基固硫剂的固硫率提高25%以上。对固硫产物的XRD、偏光显微镜下分析表明,该固硫剂固硫效率高的主要原因是:(1)大大减少了高温下氧化钙的烧结僵化;(2)生成了高温稳定的含硫矿物相;(3)使易分解的硫酸钙被高温熔体所包裹。由于该固硫剂主要由天然矿物所组成,具有来源广、成本低廉等优势,因而具有极高的应用价值和市场推广潜力。 相似文献
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钾长石-硫酸钙-碳酸钙体系的热分解过程动力学研究 总被引:1,自引:1,他引:1
试验研究了钾长石-硫酸钙-碳酸钙体系[n(KAS6):n(CaSO4):n(CaCO3)=1:1:14]加入脱硫灰渣组分脱硫时的热分解反应动力学.结果表明:改变反应温度、脱硫灰渣组分和钾长石粒径,热分解过程均受金斯特林格模型固膜扩散控制;反应速率与钾长石初始粒径的平方成反比;添加脱硫灰渣组分有利于降低表观活化能,有利于利用脱硫灰渣热分解钾长石生产钾肥. 相似文献