碱石灰烧结法生料浆配料算法

本文以熟料组成的目标值与实际计算值的偏差平方和为目标函数,采用变量轮换法进行优化计算,从而求出为尽量满足熟料成分要求的多矿石混矿方案。实际计算表明,该算法稳定、易行,熟料中Al_2O_3含量和碱、钙比的目标均能得到保证     

K2O在烧结法中工艺矿物的研究

为认识生产中K_2O的变动对技术经济指标的影响,研究了K_2O—Al_2O_3、K_2O—Fe_2O_3二元系,K_2O—Na_2O—Al_2O_3、K_2O—Na_2O—Fe_2O_3三元系和K_2O—Na_2O—Al_2O_3—SiO_2、K_2O—CaO—Al_2O_3—SiO_2四元系,还研究了含K_2O矿物的溶解特性,熟料中K_2O与Na_2O比例的变动对烧成和溶出率的影响。     

关于改进烧结法湿法流程的刍议

在分析碱石灰铝土矿熟料现行湿法处理流程后，提出了新的方案，即取消脱硅过程，将熟料溶出粗液直接碳分得到的粗氢氧化铝用拜耳法再提纯。其优点是可以制得质量完全合格的砂状氧化铝，减少流程中Ａｌ２Ｏ３的循环量，熟料量要减少约１０％，使生产更便于控制，并且有可能进一步改进熟料溶出制度，提高有用成分的溶出率，而碳分所需石灰窑气仅增加１％，增拜耳法提纯作业则可以由取消脱硅过程得到补偿。     

一种碱石灰烧结法赤泥的X射线衍射特征探讨

对一种土褐色赤泥进行了X射线衍射分析。分析表明：它有着与传统碱石灰烧结法赤泥不同的X射线特征，并针对这一问题给予了初步探讨，它将对提高熟料铝硅比新工艺的研究提供帮助。     

烧结法熟料溶出条件对二次反应影响分析

本文根据中州铝厂部分统计资料及实验结果，通过熟料溶出条件中溶出温度、溶出液αk值和溶出液中碳酸钠浓度对二次反应在影响的分析，得出结论：溶出温度控制在75－85℃之间，溶出液αk值在1．20左右，,溶出液中碳酸钠的浓度在25g/l左右时，能有效抑制二次反应的发生，提高氧化铝溶出率，并提出进一步提高氧化铝溶出率需要努力的方向。     

碱石灰烧结法从脱硅粉煤灰中提取氧化铝

采用碱石灰烧结法,对脱硅粉煤灰中提取氧化铝过程进行了研究,系统探讨了熟料烧成条件对氧化铝溶出率的影响.实验结果表明:烧结过程中,在生料配比CaO/SiO2值为2.0、Na20/Al2O3值为1.0,烧结温度为1200℃,保温时间60分钟的烧结条件下烧成熟料,在规定的溶出条件下,熟料中A1203的溶出率可达90%以上.     

拜耳法高铁赤泥配料对烧结法技术指标的影响

研究了在６－１５万吨Ａｌ２Ｏ３排耳法与５０万吨烧结法组成的联合法生产中，不同赤泥配比的烧结法配料对烧结法技术指标的影响。结果表明，赤泥配比对烧结法的熟料溶出率、赤泥沉降性能无明显影响。但对熟料烧结温度的降低和烧结温度范围的变窄均有影响，赤泥与比越高则影响甚。在赤泥配比稳定，配料的钙比（Ｃ／Ｓ）在现有纯烧结法的生产技术指标范围内，碱比（Ｎ／Ｒ）偏中、上控制，熟料Ａ／Ｓ保持在３．５以上的条件下，采用目     

强化石灰烧结法中硅的行为研究

针对我国铝土矿资源特点和我国烧结法生产氧化铝的现状,对强化石灰烧结法中硅的行为进行研究。采用铝硅比为3.84的矿石,按照钙铝比为1.3~1.5进行配料,在1270℃以上进行熟料烧成。实验结果表明:熟料烧成无困难,熟料中氧化铝含量达到了48%~53%,熟料中主要物相为CaO.Al2O3和2CaO.Al2O3.SiO2,烧结熟料溶出性能好;烧结熟料溶出后粗液中硅含量仅为20mg/L~30mg/L,硅量指数可达1000以上,可省去专门的脱硅工序;提出用"纯氧化铝溶出率"作为烧结法的经济指标,强化石灰烧结法用A/S比为3.84的矿物达到了强化碱石灰烧结法A/S7的指标,且碱耗更低。     

烧结法生产工艺嫁接低温拜耳法流程工业实践

通过对比烧结法流程与低温拜耳法流程的异同,提出烧结法嫁接低温拜耳法的新思路。工业生产运行证明,烧结法嫁接低温拜耳法是可行的,能够大幅度降低氧化铝制造成本,为进口三水铝石矿的应用和烧结法转变生产方式,开辟了一条新路。     

烧结法粗液与拜耳法溶出矿浆部分合流技术工业应用的研究

本文针对长铝公司氧化铝厂的工艺流程、设备配制 ,以及今后烧结法工艺的发展趋势 ,结合长铝公司研究所对烧结法粗液与拜耳法溶出矿浆部分合流的研究数据 ,通过计算与现场观测 ,提出了经济可行的工业应用方案 ,并对合流后的生产参数变化及经济效益做了相应的预测     

Dilatometeric study of shrinkage during sintering process for porcelain stoneware body in presence of nepheline syenite

The shrinkage of porcelain stoneware body containing different values of nepheline syenite was investigated. Dilatomeric tests were carried out on suitable specimens to obtain the expansion-shrinkage behavior of ceramic bodies. The differences found in shrinkage data were evaluated by kinetic model and determination of activation energy. The results showed that the activation energy increases with Na₂O + K₂O/quartz ratio and reaches to constant value when 10.0 wt.% nepheline syenite is added to starting composition. The maximum value of shrinkage also approximately remains constant with increasing fluxing agent. It was found that the fluxing effect of nepheline syenite was quite evident with the observed enhanced rate of densification accompanied by the typical compensation effect.     

强化烧结法分解的途径

针对我厂目前的生产状况，本文从提高分解原液的硅量指数、稳定碳分原液量、控制CO2浓度和压力、控制碳分原液αk等技术指标和改进工艺流程方面，提出了几种强化烧结法分解的途径。文中提及的几项技术指标和工艺流程。尤其为砂状氧化铝的生产铺平了道路。     

低温拜耳赤泥石灰法脱碱工艺优化研究

对低温拜耳赤泥石灰法脱碱工艺进行了研究,考察了钙钠比、温度、时间、液固比、脱碱浆液碱含量对脱碱率的影响,得到了优化脱碱工艺,该工艺与以往脱碱工艺相比,无需再加热、加压,实现了利用生产中赤泥自身温度而脱碱的目的,从而降低了脱碱成本,简化了生产工艺流程,对同类企业有一定的参考价值。     

Research on sintering process of YSZ electrolyte

Yttria stabilized zirconia (YSZ) has widely been used as electrolyte in solid oxide fuel cell (SOFC).The microstructure of YSZ related to the fabrication process was discussed in the paper.With YSZ nano-powders about 40-100 nm as raw material, the YSZ adobe was manufactured by tape calendering process.The named three-step sintering process was performed at 1000 ℃ for 2 h, then raised the temperature with normal rate and as soon as up to 1400 ℃, the furnace was controlled at 1250-1300 ℃ for 10-20 h.The high dense YSZs with the relative density of 96%-99% were obtained; the grain size of YSZ could be reduced to 0.5-3 μm.The above result is benefited to co-fired in the electrode-supported SOFCs.     

Preliminary study on the fabrication of aluminium foam through pressure assisted sintering dissolution process

This paper discusses the improvement made by pressure assisted sintering dissolution process (PASDP) as opposed to the solid-state sintering dissolution process (SSSDP) which was used in producing a much improved open celled aluminium foam. The improvements leads to an aluminium foam possessing a high dense of cell wall which is attainable in a much shorter time and possesses superior mechanical properties. By varying the local sodium chloride (NaCl) volume fractions in the sodium chloride/aluminium (NaCl/Al) compact, it is possible to fabricate aluminium foam with different relative densities. When subjected to monotonic compression mode, the fabricated aluminium foam exhibits typical stress–strain behaviour of metallic foam. The principles of Taguchi's Design of Experiments were employed to optimize processing factors for the fabrication of aluminium foam. Results were analysed based on Taguchi's signal to noise ratio (S/N) and analysis of variance (ANOVA) techniques in order to obtain the optimum combination of process parameter settings. Results indicate that the most notable factor influencing the fabrication of Al foam was the compaction at elevated temperature, followed by temperature, time and the process heating rate. The optimum processing parameters for the PASDP process were then predicted based on these results.     

活性石灰/粉煤灰制备烧结烟气脱硫剂配比试验研究

本文研究了以钢铁企业常用物料活性石灰和自备电厂粉煤灰制备的脱硫剂,在循环流化床脱硫试验装置上进行了烧结烟气脱硫剂配比试验.试验结果表明,活性石灰与粉煤灰的质量比按1:2配置时,脱硫剂钙的利用率较高,具有较好的经济性.     

烧结工艺对纳米银焊膏微观结构的影响

对纳米银焊膏的低温烧结过程进行了研究。首先采用热重分析（TG-DSC）研究了纳米银焊膏有机物挥发的物理机制,确定合理的试验参数。运用扫描电镜（SEM）观察不同条件下纳米银焊膏的微观结构。结合MATLAB软件对SEM图片进行处理,定量分析孔隙率的变化。采用ASTM E 112-96标准中的线性插值法对纳米银焊膏的平均颗粒尺寸进行统计。结果显示,升高温度、加快升温速率以及延长保温时间可以有效提高纳米银焊膏的致密化程度;过高的温度和过长的保温时间会导致烧结银颗粒粗化。     

An experimental study of the sintering of nanocrystalline WC–Co powders

Since nanocrystalline WC–Co powder was produced over a decade ago, the sintering of nanocrystalline powders remains a technological challenge. The goal of sintering nanocrystalline powders is not only to achieve full densification but also to retain nanocrystalline grain sizes. This is difficult because of rapid grain growth at high temperatures. Previous studies on the sintering of nanocrystalline WC–Co have shown that grains grow rapidly during the early stage of sintering. But there are few studies on the mechanisms of grain growth and densification during this stage. This paper presents the results of an experimental investigation on grain growth and densification of nanocrystalline WC–Co powders during heat-up at equilibrium solid-state temperatures. The results have shown that nanocrystalline WC grains grow rapidly during this period concurrently with rapid densification. The rapid densification and grain growth are partially attributed to the surface energy anisotropy of tungsten carbide. The effects of vanadium carbide on grain growth at solid state during heat-up are also discussed.     

筒形件错距旋压成形工艺参数的正交试验研究

工艺参数对成形质量的影响规律是旋压成形工艺研究的重点,而旋压件的椭圆度、直线度、壁厚偏差等是评价成形质量的重要指标.本文以旋压件椭圆度、直线度、壁厚偏差为评价指标,采用正交试验法对错距旋压成形工艺参数进行分析,获得了影响椭圆度、直线度、壁厚偏差的因素主次顺序.结果表明,筒形件旋压成形过程中,影响筒形件椭圆度/直线度因素的主次顺序为:进给比＞总减薄率＞轴向错距量;影响筒形件壁厚偏差的因素主次顺序为:总减薄率＞进给比＞轴向错距量.