Leaching technique

In order to overcome some of the drawbacks associated with the fiber bonding preparation, a solvent-casting and particulate-leaching technique was developed [32], With appropriate thermal treatment porous constructs of synthetic biode-... 

Highly porous membranes with an inter-connected pore structure were produced using this solvent-casting and particulate-leaching technique (Fig. 4a, b). The porosity of porous PLLA membranes could be controlled by varying the amount of salt used to construct the composite material (Fig. 5a). 

The authors described several other fabrication techniques, but their conclusions are the important parts of their report Conventional scaffold fabrication techniques are incapable of precisely controlling pore size, pore geometry, spatial distribution of pores and construction of internal channels within the scaffold. They also state that scaffolds produced by the solvent casting-particulate leaching technique cannot guarantee interconnection of pores because interconnection is dependent on whether the adjacent salt particles are in contact. Moreover, only thin scaffold cross sections can be produced due to difficulty in removing salt particles deep in the matrix. 

Roll-front uranium deposits in confined aquifer systems are amenable to extraction by in situ leach techniques. This method of mining was first tested in Wyoming approximately twenty years... 

Rapin, F. and Forstner, U. (1983) Sequential leaching techniques for particulate metal speciation the selectivity of various extractants. In Proceedings of the 4th International Conference on Heavy Metals in the Environment, Vol. 2, Heidelberg, CEP Consultants, Edinburgh, pp. 1074-1077. 

Bacterial leaching of copper by Thiobacillus ferrooxidans has been practiced for years. Yearly, 250000 tons of copper are recovered by microbial leaching techniques in the USA. This process can be represented by the following simplified equations ... 

Understanding sulfate transport and retention dynamics in forest soils is a prerequisite in predicting S04 concentration in the soil solution and in lake and stream waters. In this study, forest soil samples from the Gardsjon catchments, Sweden, were used to study S04 transport in soil columns from the upper three soil horizons (E, Bs, and BC). The columns were leached using a sequential leaching technique. The input solutions were CaS04 equilibrated with forest floor material. Leaching behavior of S04 and concentration in the effluent were measured from columns from individual horizons. S04 was always retained in the Bs and BC horizons, while... 

Anczkiewicz R., ThirlwaU M., and Platt J. P. (2002) Influence of inclusions and leaching techniques on Sm-Nd and Lu-Hf garnet chronology. Geochim. Cosmochim. Acta (Goldschmidt Conf. Abstr.) 66, A19. 

Ultrasound-assisted leaching versus other leaching techniques... 

This section discusses the principal aspects of the ASE technique, which include the steps of the extraction process, the devices used, their amenability to coupling to other operations and the most salient applications reported so far (with special emphasis on those that have introduced some innovation). In the final sub-section, ASE is compared with alternative leaching techniques. 

Comparison of ASE with other solid-liquid extraction (leaching) techniques... 

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