Bone China manufacturers talk about the production steps of bone china cups

1. Calcium oxide is made into calcium hydroxide emulsion;

2. According to the complete reaction calculation, under the condition of stirring, evenly add phosphoric acid into the calcium hydroxide emulsion, complete reaction, and obtain white precipitate;

3. Dehydrate and dry the white precipitate above, and calcinate it at about 1300°C, and the obtained powder is synthetic bone meal.

Because the selected raw materials for synthetic bone meal are relatively pure industrial grade chemical raw materials, the purity of the product is relatively high, and the content of calcium phosphate is also high. The dosage in the green body formula is generally 40%-45%. Phosphorous mineral apatite has a similar chemical composition to bone powder, so it can partially replace bone powder to make bone china, and can produce a body with good transparency, but it is easy to deform. Because it contains a certain amount of fluorine, it is unfavorable to use as a blank, and there are often pinholes, air bubbles or cloudy phenomena. Care must be taken when selecting raw materials. Apatite is rarely used in actual production to make bone china.

Introducing a small amount of apatite into the feldspar glaze can improve the gloss of the glaze and make the glaze soft, but the amount should not be too much. If the content of phosphorus pentoxide exceeds 2%, it is easy to cause defects such as pinholes and bubbles in the glaze. It will also increase the melting temperature of the molten glaze of the glaze.