PRODUCTION OF LOW SODIUM SALT WITH BALANCED MINERAL CONTENT

摘要

A process is provided for preparing a salt product with reduced sodium content including the step of providing a concentrated brine, which is typically seawater, to which has been added potassium chloride. The mixture is transferred to a crystalliser unit where at least a portion of the mix is transferred to the crystalliser through a washing column. Liquid is evaporated from the crystalliser such that crystals form, crystals are passed from the crystalliser through said washing column to a separating unit such that in the passing through the washing column the crystals are rinsed with the brine portion being transferred as a counter current through the column. The inventive process is characterised by recycling of the brine from which the salt crystallises, thus all main ingredients of the mixed input brine reach a steady equilibrium concentration in the mother liquor in the crystalliser. These will then precipitate as crystals, as more of the respective substances gets added to the mother liquor through inflow of mixed input brine. None of the liquor is purged out of the system as in conventional salt crystallisers. All the components in the feed are substantially contained in the product from the crystalliser either as crystalline material or soluble ingredients.