The prepared body slurry is passed through a 200-mesh sieve and a series of permanent rare earth magnets and taken into a final mixing tank where in stirring arrangements are provided with very low rotation speed. This keeps the liquid slurry in motion and in suspension to avoid the settling of heavier particles in the […]

In the next stage of the process the liquid ball clay slurry and the liquid china clay slurry are taken into a high speed blunger as per the batch formulation requirement. The silica is ground in a separate ball mill which is lined with silex stone and is then passed through a 200-mesh sieve and […]

In the wet process the ball clays and china clays are blunged separately and sieved through a 250-mesh high frequency vibro meter. To facilitate a better sieving process in some companies they follow a special sieving system of passing through sieves of stage sieving. This comprises of a set of sieves 40-mesh, 80-mesh, 100-mesh, 140-mesh […]

In some parts of the world few factories follow dry mixing method. In this method the ingredients are mixed in a dry state in a suitable mixer and then correct amount of water is added to give required plasticity and mixed for few minutes.
The advantages of dry method over wet method is the economy of […]

The normal method of body preparation for Earthenware bodies is through a wet method. In this process the different ball clays are blended and mixed in water in a very high speed blunger. Since the ball clays are harder due to sedimentary type of clays, very high speed blungers are required to blunge the clays. […]

Preparation of Earthenware Body
Flow chat for preparation:
Ball clays Feldspar Silica
Blunging […]

Feldspar: Feldspar can be either potash feldspar or soda feldspar. Feldspar is used in the body as a flux - it brings alumina and silica along with the alkalis. Feldspar helps the body to vitrify at lower temperature. During firing, the alumina, silica from ball clays, china clays, silica and feldspar, combines in the presence […]

Ball clay: Ball clay is used in the body for improving workability and conferring strength to the unfired articles. Carbonaceous ball clays are usually incorporated where the production process is carried over through casting method. The colloidal carbonaceous matter helps in the production of stable casting slips. Normally to have a better body, blended ball […]

The common body formulation used all over the world is as follows:
Ball clay ……….. 25% […]

The term ‘earthenware’ is derived from the early types of wares that were made out of natural clays of earth.
Now a days since the demand is largely for white domestic wares these are no longer made from simple clays. Instead these are made from different mixtures of raw materials like plastic clays, quartz, feldspar […]