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微波干燥闪锌矿试验研究 总被引:1,自引:1,他引:1
研究了利用微波加热干燥闪锌矿的新工艺,对影响闪锌矿相对脱水率的微波功率、微波辐射时间和物料质量等因素进行了研究,得出微波干燥闪锌矿优化试验条件为物料质量100g、干燥时间80s、微波功率700W,在此条件下微波干燥闪锌矿的相对脱水率为26.06%,并进一步对微波干燥闪锌矿的失水特性进行了分析和讨论;通过对试验数据的回归分析,获得了微波干燥闪锌矿的数学模型,采用Boltzmann模型最佳。 相似文献
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采用微波加热技术对铅渣进行脱水。通过响应曲面法中心组合设计分析了干燥温度、干燥时间、物料厚度对脱水率的影响,并建立了相关的数学模型。方差分析表明,二次方数学模型拟合较好,物料厚度、干燥温度对脱水率的影响较干燥时间更为显著。优化工艺参数为干燥温度93℃,干燥时间10min,物料厚度19mm,相对脱水率达到68.21%,实际值与模型预测值相差0.73个百分点,干燥后铅渣的含水量为8.12%,可以满足后序工艺要求。 相似文献
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在分析原料主要物相组成和元素分布状态的基础上,对微波干燥过程的机制进行了深入分析。采用热重和热干燥分析方法确定了铁渣中水分存在形式,并对原料的高温介电特性和影响微波干燥的主要因素进行了探究。研究结果表明,铁渣含有结晶水的物相为 CaSO4·0.5(H2O) 和 CaH(AsO4)·2H2O,自由水含量为 17.6%,结晶水含量为 11.1%,自由水含量高于结晶水,微波干燥具有优势。微波干燥的最佳技术参数为:微波加热功率900 W,干燥时间 90 s,物料厚度 1.5 cm,此时,温度为 93 ℃,主要为自由水的脱除,脱水率为 18.42%。微波干燥比同等程度常规干燥节约 91.67%时效。 相似文献
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简要介绍了微波技术特点及微波设备的工作原理,研究了微波加热干燥工艺条件与氢氧化铌含水量、物料粒度的相关性,分析了微波干燥技术的经济性.该工艺技术应用于氢氧化铌干燥,达到了清洁生产和节能环保的效果. 相似文献
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微波干燥APV技术研究 总被引:2,自引:0,他引:2
对微波干燥不同水分含量的APV(多钒酸铵)工艺条件及相关参数进行了研究,得到了满足干燥后水分含量的APV物料。试验表明:微波干燥APV工艺在技术上是完全可行的,对于不同含水量的APV,经过微波干燥,其水分含量均可降至3%以下,满足钒生产工艺对APV水分含量的要求;在微波加热干燥过程中,无粉尘产生,对环境无影响且钒的回收率高,属绿色环保技术;微波干燥设备的操作性好,微波功率、温度、时间等参数易于控制。 相似文献
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镍红土矿微波干燥的探索研究 总被引:2,自引:0,他引:2
采用经改造的含红外测温仪和分析天平的家用微波炉系统进行红土矿干燥实验,研究了不同微波功率和红土矿粒径对红土矿失重速度的影响。结果表明:适合的微波功率条件为700 W,20 min可使红土矿所含游离水的脱水率达到95%,高于传统干燥的效果;在-60+200目的粒度范围内,粒径大的红土矿脱除水的绝对量较粒径小的要大,微波干燥后的粒径分布趋于集中,有利于进一步处理。实验进一步表明,红土矿在微波加热下达不到脱除结晶水的温度,并初步探索出加入炭粉可在一定程度上改善红土矿在实验微波炉中的升温效果。 相似文献
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Using a specially constructed microwave device, containing a steady-state-broadcasting magnetron that is infinitely adjustable within a range of 100 to 1200 W, the applicability of microwave energy for drying medicinal plants was investigated. When optimising the drying parameters (e.g. microwave power, time of irradiation, mass of plant material, thickness of layer) most of the obtained leave, flower, herb and root drugs showed a significant better appearance (colour) than the air dried drugs. 相似文献
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Cylindrical cavity perturbation method was used to measure complex permittivity of zinc oxide leach residues (ZOLR) at frequency of 2.45 GHz. The results indicate that both dielectric constant and Loss factor of ZOLR increased with increased of temperature and moisture content. The research of ZOLR’s microwave absorption properties were performed based on reflection loss (RL) theory. Microwave absorption peak of ZOLR moves towards higher material thickness with decreasing of moisture content. However, microwave absorption peak of ZOLR moves towards smaller material thickness with increasing of temperature. RL of ZOLR sensitively depends on material thickness of itself. If want to keeping microwave absorption properties of ZOLR greater than 90% in the process of microwave drying, 10 mm, 40 mm, and 50 mm should be selected as the optimum material thickness. 相似文献
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High initial moisture in converter sludge enhanced the bursting risk during drying and made this process difficult. In this investigation, effects of parameters on their drying properties were studied through orthogonal tests in a baking cup equipped with a cross flow adjusting system to simulate the two stage thermal condition in a travelling grate. The upper layer bursting rate and the bottom layer dehydration rate are considered as main indicators of drying performance. ANOVA results show that factors of temperature in the 2nd drying and time in the 1st drying have remarkable influence on the upper bursting rate, occupying 45.80 and 34.82% of the total contribution. While time and flow rate in the 2nd drying are significant factors on the bottom dehydration rate, accounting for 56.09 and 27.03%. Additionally, the upper bursting rate decreases with the increasing 1st drying time and decreasing 2nd drying temperature. The bottom dehydration rate increases with the increase of 1st drying time, 2nd drying time and 2nd drying flow rate. Under the optimal condition of temperature 150°C, flow rate 1.5?m?s?1, time 9?min in the 1st drying stage, and temperature 200°C, flow rate 1.5?m?s?1, time 6?min in the 2nd stage, no burst occurs, and the bottom dehydration rate is as high as 88.81%. These results could be used as the basis for subsequent preheating and reduction process. 相似文献