Advantages And Disadvantages Of Crystallisation

What is crystallisation?

Crystallization is the (artificial or natural) process of formation of solid crystals precipitating from a solution, melt or more rarely deposited directly from a gas. That is on a nanometre scale, molecular forces tend to gather the particle to form tiny clusters. Some of these clusters will be unstable and breakdown. However those of who, who become large enough to be stable go to the next stage crystal growth. The solubility of the solid cluster depends upon the operating condition that is the temperature and pressure, saturation purity etc. This stage can be most presently seen in the crystallisation of sodium chloride.Crystals come in many different shapes and forms. The shape and forms and shape is defined by molecular structure , however the crystal size and purity would depend on the operating conditions where the crystals form. Since crystallization process is controlled by both kinetic and thermodynamic aspects

Crystallisation a most common method for obtaining pure metals is used diversely for recovering various metals. Crystallisation of a metal salt out of an aqueous solution can be achieved by evaporating the liquid from solution until the concentration of the solute goes past the saturation point. Taking advantage of the fact that solubilities of

Differences in solubility is used to separate two metals from leach solution. To separate Nb from Ta, the differences in their solubility of their fluorides K2NbOF5 ,K2TaF7 can be used successfully . The slurry containing metal oxide is dissolved in 70% HF diluted and heated just below their boiling point. A potassium salt is added in sufficient quantity to form complex fluoride of Nb and Ta in the solution. The solution is filtered and cooled at room temperature. Most of the Ta salt crystallizes out while the Nb salt remains in the