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在一定工艺条件下,研究了添加剂1,2-辛二醇对铝酸钠溶液种分产品强度和形貌的影响。结果表明,添加剂1,2-辛二醇的加入能明显抑制铝酸钠溶液的分解(分解初期),同时加入添加剂后铝酸钠溶液种分生成了很多小晶体,这些小晶体或填充在晶粒缺口处;或镶嵌成大颗粒,且大颗粒之间有充当粘结剂的更细的晶粒填充,明显改善了产品的强度。 相似文献
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附聚是铝酸钠溶液中氢氧化铝颗粒最主要的长大方式,强烈影响产品强度,是影响氧化铝品质最重要的过程之一。本文以铝土矿浮选药剂中常用的捕收剂塔尔油作为添加剂,研究了其对过饱和铝酸钠溶液种分速率、附聚效率的影响,结果表明,浓度小于0.1g/L的塔尔油对过饱和铝酸钠溶液种分速率影响很小,但能强烈促进附聚过程,在添加量为0.1g/L的条件下,附聚效率由2.68上升到3.64。研究结果对于铝土矿浮选捕收剂选择及过饱和铝酸钠溶液的种分附聚添加剂的选择具有指导意义。 相似文献
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Gibbsite crystals display large varieties of shapes and sizes when grown from sodium aluminate solution. The usage of gibbsite is partly determined by morphology, therefore, controlling the gibbsite morphology in accordance with usage arrests interests of both merchants and scientists. In present study, the effects of organic additives with various functional groups, oleic acid, l-octadecanol and stearic acid on gibbsite morphology were investigated at the concentration of 0.1 g/L. Experiments were performed at the temperature of 65 ℃. Samples ofgibbsite crystals were obtained from the decomposition of the unseeded synthetic sodium aluminate solution. The morphologies of these gibbsite crystals were examined with SEM, which shows that functional groups influence gibbsite morphology intensively. The morphologies of gibbsite nucleated from the pure solution and solution containing oleic acid, 1-octadecanol and stearic acid are as follows: mosaic gibbsite consisting of various shapes of crystals, radial agglomerate consisting of hexagonal pallets, mosaic and ball like agglomerate consisting of block crystals and loose, radial crystal consisting of irregular tiny nuclei. The facts indicate that it is possible to control gibbsite morphology at the presence of additives with various functional groups. The action mechanism of functional group to morphology was also proposed. 相似文献
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采用多孔金属膜作为过滤介质, 结合锌液连续净化工艺, 对某冶炼厂的中性浸出液进行了净化试验。结果表明, 溶液过滤通量大, 经2段净化后即可用于电积, 同时可节约还原锌粉40%, 电积锌纯度达到0号锌标准, 电流效率比采用传统的4段净化得到的锌液高5个百分点以上。本工艺具有流程短、净化效果好的优点, 可望在工业生产中得到应用。 相似文献
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采用广西某公司提铟流程中产生的萃余液氧化除铁渣作为除氟剂,对回转窑尾气洗水进行除氟处理,在溶液初始pH≈5.0,除氟剂添加量为理论量的5倍, 温度40 ℃,机械搅拌条件下,尾气水中的氟离子浓度降至50 mg/L以下,氟离子脱除率达90%以上。该脱氟技术应用于工业试验,溶液中氟离子浓度由370 mg/L下降至50 mg/L以下。 相似文献
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对国产与日本产两种ITO靶材进行全面的分析对比,并对ITO靶材的断口形貌与靶材黑化结瘤之间的关系进行了探讨。结果表明,国产靶材与日本靶材的相对密度、电阻率、失氧率等参数比较接近,二者均为单一晶相的固溶体。国产靶材的断面为"解理+韧窝"的脆—韧混合断裂,断裂面晶界上出现了粒径较大的无规则颗粒物;而日本靶材断面为解理脆性断裂,断裂面晶界清晰,无颗粒物出现。 相似文献
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Effects of tetracarbon additives, 1-butanol, 1,4-dioxane and tetrahydrofurane on gibbsite precipitation from caustic seeded sodium aluminate liquor were investigated. The additive was charged into supersaturated seeded sodium aluminate liquor, then the precipitation ratio of aluminate liquor in 10 h was evaluated and compared, and the particle size distribution of product was measured. The Mulliken atomic charge of oxygen in the additive molecule was calculated with DMo13 program. The results show that 1-butanol has little effect on gibbsite crystallization, while the precipitation ratios under the effect of 1,4-dioxane and tetrahydrofurane are 1.7% and 3.6% higher than that of the blank, respectively. The agglomeration efficiency of the product is also enhanced obviously by the addition of 1,4-dioxane and tetrahydrofurane. The precipitation ratio is inversely proportional to Mulliken atomic charge of oxygen atom, which implies that functional group in the additive molecule is involved in the gibbsite precipitation process more fundamentally than carbon chain. 相似文献
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用固相法制备Fe2W型铁氧体BaFe2-x2+CoxFe163+O27(x=0.0~0.8),采用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、红外光谱仪(FT-IR)和振动样品磁强计(PPMS-VSM)等手段分析其物相组成、结构和磁性并使用Reitveld拟合分析晶体结构,研究了Co2+部分取代Fe2+的Fe2W型铁氧体的微观结构和磁性。结果表明:所有样品都是纯相铁氧体BaFe2-x2+CoxFe163+O27。样品具有W铁氧体结构,晶粒呈良好的六角形结构且分布均匀。用 Co取代能明显提高Fe2W型铁氧体300 K的饱和磁化强度(Ms)。 相似文献