What are the benefits of using sodium hexametaphosphate in ceramics?

Due to the price advantage of inorganic water reducing agents, and the water reducing effect in some mud materials can also be satisfied. Therefore, inorganic water reducing agents are often used in the production of many ceramic factories. Among them, sodium hexametaphosphate, water glass, and sodium metasilicate pentahydrate are commonly used, and the water reducing effect of sodium hexametaphosphate among several water reducing agents is better.

When the polymer water reducing agent is mixed with the inorganic water reducing agent, the factors of the double layer of the inorganic water reducing agent are utilized, and the steric hindrance of the polymer water reducing agent is utilized, and the water reducing effect is better. The technicians tried to compound sodium hexametaphosphate and water glass. In the test, a large brick factory billet was used, and the water added amount was 34% of the billet. If only water glass and sodium metasilicate pentahydrate are used, the mud has a flow time of 180 seconds, which is almost impossible to flow and has a large thixotropy.

After adding 0.15% sodium hexametaphosphate produced by Chuandong Chemical Group, the mud flow time is reduced to 60 seconds, and the mud fluidity is obviously improved, indicating that two different types of inorganic water reducing agents are compounded, and the performance can be complemented. A single water reducing agent has an advantage. Although inorganic sodium phosphate has a significant effect on reducing the viscosity of the slurry and improving its fluidity, the suspension property is poor.
When a small amount of 0.05% sodium hexametaphosphate is added, the flow rate of the mud is improved more obviously, and the flow time is 45 seconds, indicating that the polycarboxylic acid polymer water reducing agent and the traditional silicate water reducing agent have more effect of reducing water. Significantly, the original mud flow rate and stability are maintained with less added amount, greatly reducing the cost of the additive. At present, the water content of the glazed blanks that are difficult to dissolve can be less than 34%, and the easy-to-peel glue can achieve about 31%, and the pressure in coal consumption and environmental protection will be lower.

When the amount of water added is 40% of the billet, the original compounding scheme uses only water glass and sodium metasilicate pentahydrate. Even if the amount of sodium metasilicate pentahydrate is increased, the flow rate of the slurry can no longer be reduced; but only When a small amount of 0.04% sodium hexametaphosphate is added, the flow time of the slurry is rapidly reduced to 48 seconds, which can reduce the flow rate of the slurry without increasing the cost of the additive.
Therefore, sodium hexametaphosphate has been developed from the beginning of water treatment to overcome the "red water" phenomenon, and has been widely used in ceramics, refractory materials, detergent builders, etc., with good ability to complex metal ions, and calcium, magnesium, The metal ions such as iron complex to form a soluble complex, and the effect achieved in the ceramic water reducing agent is better than other inorganic water reducing agents.