Simultaneous Granulation and Drying of Filter Cake

There are normally two possible routes for converting a wet cake obtained from a filter or centrifuge into a granular end product: drying followed by mechanical compaction; wet granulation followed by drying. A third way, simultaneous granulation and drying, has been investigated and has been in use now for several years for the production of a granular end product. It has the following advantages over wet granulation followed by drying: the process is able to accommodate a wide range of moisture contents and the bulk density of the end product is higher. The advantages over drying followed by mechanical compaction are the need for only one process step and the superior shape of the particles (more spherical, less sensitive to attrition).     

Empirical Modelling of Cake Washing in a Pressure Filter

The focus of this article is on empirical modelling of filter cake washing. The filtration experiments introduced in this paper were conducted by using a pilot-scale (0.1 m²) filter press according to the basic principles of factorial designs. Five different variables of the filtration, pressing, cake washing, and air drying stages were considered in the tests and the examined product characteristics were the overall capacity of the filter and the purity of the cake. The results obtained from the tests were used for creating different kinds of regression models for explaining the influence of the studied variables on the success of the cake washing process. The goal of the modelling strategy for the cake washing was to determine the simplest empirical models and compare these with theoretical equations complemented with linear terms. It was found that the empirical equation could model the results more accurately than the theory-based equations could.     

滤饼过滤过程的计算机模拟研究

利用自行设计的计算机模拟程序 ,对物料粒度、浆体浓度、过滤压差对过滤脱水的影响以及滤饼分层现象进行了计算机模拟 ,并通过实验进行了验证。结果表明 ,模拟结果虽然在数值上与实验结果有一定差距 ,但定性方面能够很好地与实验结果相吻合。     

滤饼颗粒物性对滤饼特性影响的分析

介绍颗粒的物性及滤饼的特性,通过对形成滤饼的颗粒物性的分析,论述了颗粒的尺寸、颗粒尺寸分布、颗粒密度、颗粒形状和颗粒间附着力对滤饼特性的影响,证实了滤饼的特性与其颗粒物性之间有着密不可分的联系,不同的颗粒物性将直接影响滤饼的特性（尤其是对滤饼比阻）的不同,从而影响过滤的效果。     

Decreasing Filter Cake Resistance by Using Packing Structures

Packed beds used in absorption columns are evaluated to determine whether they can also be beneficial for cake‐forming filtrations. To assess this, model systems are characterized and separated by using a dead‐end filter cell. Filtrations are conducted with different packings; the filtrate amount over time and resulting turbidity are evaluated. Packings increase the filter cake resistance and the separation time of the cakes formed with approximately incompressible solids. However, they exhibit a positive effect on the filtration of a more complex, compressible substance; the process is not only accelerated, but also the quality of the obtained filtrate is not compromised. These results demonstrate potential in the use of packed beds for the filtration of complex biogenic suspensions.     

Biomimetic Synthesis and Characterization of Mesoporous Titanium Dioxide

Mesoporous titanium dioxide (TiO₂) with a pore size range from 5–7 nm was synthesized by a sol‐gel method using biosurfactant phosphatidylcholines as an organic template. Titanium tetrabutoxide (TBOT) was used as the precursor. A very fine mesoporous structure formed in the particle was maintained after a heat treatment at 700 °C. Low‐angle X‐ray powder diffraction (XRD) and a pore size distribution curve revealed the existence of the mesoporous structure. Transmission Electron Microscopy (TEM) and N₂ adsorption–desorption isotherms were utilized for further characterization. A significant red shift in the UV‐VIS spectrum of the porous material was observed, which could be explained by the energy band theory. The results confirmed the synthesis of mesoporous TiO₂.     

饱和滤饼洗涤性能研究

分析介绍了饱和滤饼的洗涤现状及存在的问题。应用置换、传质理论，建立了饱和滤饼置换、扩散洗涤的数学模型。通过实例计算出浓度比与洗涤比的关系，并与前人实验结果比较，证明了该数学模型的正确合理性。     

Biodiesel Production Using Calcined Waste Filter Press Cake from a Sugar Manufacturing Facility as a Highly Economic Catalyst

For the first time, a low cost, high performance and environmentally friendly heterogeneous catalyst derived from waste filter press cake (FPC) from a sugar manufacturing facility was used for the production of biodiesel. This industrial waste was calcined in air at 900 °C for 2 h to convert it into an active CaO‐based catalyst (FPC‐HT). In addition, the calcium oxide nanoparticles (FPC‐NAC) were synthesized by surfactant‐hydration treatment of FPC‐HT. The synthesized catalysts were characterized by XRD, FTIR, SEM, TEM and BET analysis. These calcium oxide catalysts were used for a transesterification reaction between canola oil and methanol to produce biodiesel. The results show that the FPC‐NAC has higher catalytic activity than FPC‐HT under optimized reaction conditions. Therefore, this economic catalyst is able to catalyze the transesterification of canola oil to its methyl esters in 1.5 h with yields above 96 %.     

铜砷滤饼废渣的生物浸出

采用生物浸出法处理铜砷滤饼废渣,考察了pH值、温度和菌种对浸出效果的影响,分析了铁氧化菌浸出机理和将生物浸出用于含砷废渣无害化处理的可行性. 结果表明,微生物对铜砷滤饼浸出起促进作用,热酸预处理后在50℃、pH值为1.5的条件下,以中度嗜热西伯利亚硫杆菌(Sulfobacillus sibiricu)浸出7 d,砷浸出率达91.33%,铜浸出率达94.22%.     

滤饼过滤过程的计算机模拟程序设计

详细介绍了滤饼过滤过程中各物理量的计算公式、计算机模拟程序的设计 ,为滤饼过滤过程的研究提供了一种新的研究方法     

铬黄滤饼洗涤吹干效果的实验研究

介绍了铬黄滤饼洗涤的重要性及存在的问题,用自制的实验设备及设计的流程,通过正交实验设计,进行了各种工况条件下的实验,取得了相应的实验数据,研究分析得到了洗涤时间、压力、温度对洗涤效果的影响和滤饼吹干时间与滤饼含盐量关系及洗涤时间、压力、温度、吹干等的最佳操作值。     

Periodic Mesoporous Organosilica Nanorice

A periodic mesoporous organosilica (PMO) with nanorice morphology was successfully synthesized by a template assisted sol–gel method using a chain-type precursor. The PMO is composed of D and T sites in the ratio 1:2. The obtained mesoporous nanorice has a surface area of 753 m² g⁻¹, one-dimensional channels, and a narrow pore size distribution centered at 4.3 nm. The nanorice particles have a length of ca. 600 nm and width of ca. 200 nm.     

Parameter Estimation for Incompressible Cake Filtration: Advantages of a Modified Fitting Method

There is a widely used linear strategy to determine the parameters specific cake resistance and filter medium resistance in incompressible cake filtration. In this article, it is intended to demonstrate that this strategy has some disadvantages and should be replaced by an alternative nonlinear approach which yields more exact results. Even though the gains in precision are small for most cases, the nonlinear strategy is favored because it involves no extra effort and is grounded in the same physical theory as the original approach. This claim is based on a broad simulation study using noisy data with known parameter values to compare both fitting strategies and judge their accuracies.     

煤泥滤饼碎干工艺的研究

针对湿法选煤生产的煤泥滤饼,提出将其定量破碎后放以穿流干燥,以此调整其块度和水分,满足商品动力煤的质量要求,再与之掺配售出,进而高效益、大批量地解决选煤厂煤泥产品的出路问题。并从理论上分析了穿流干燥作业恒速与降速干燥阶段的影响因素,简要介绍了通过中间试验和工业试验对碎干工艺的研究。     

航天炉气化滤饼应用方案探讨

分析了航天炉煤气化生产过程中所产生滤饼的特性,从工业应用的角度提出了解决滤饼应用问题的方案,并对利用方案进行了评述.