through the continuous four-stage "bayer process" involving: digestion - dissolving bauxite's alumina content bauxite is finely ground in mills, and then mixed with a recycled caustic soda solution and steam in digester vessels operating at high temperature and pressure. this dissolves the alumina content...
vegetable sources such as carrot, celery, beetroot and cabbage. in general, the fresh vegetables are first washed and sorted before being coarsely milled and then pressed to extract the juice. most vegetable juices have low acidity, i.e. a ph > , and therefore they require a full sterilisation process...