Lithopone is like titanium dioxide, a white pigment widely used in major industries and an inorganic compound product. Although we all have a certain understanding of Lithopone, know that it has good performance, as a coating and other products, the application effect is good, but most people do not know how lithopone is made, it is mainly made by roasting and soaking method, and then through a series of processes to get high-quality lithopone. Let’s look at it in the context of the following.
We all know that Lithopone is widely used, and it has good performance as a coating and other products. However, many people do not know how it is made.
In most construction projects, paint is used on the exterior wall, which is more inclined to Lithopone. Its cost is low, the whiteness effect is obvious, and it is suitable for various climate changes, and it is not easy to change. Therefore, its production process must be very strict to ensure the quality of use. There are many ways to make it, and the roasting and leaching method is a more commonly used method. It has three components: the original furnace, clarifying barrel, plate and frame three components responsible for their respective work content, after the specified processing sequence and then after the final washing, adding fixing agent, pressure filtration, drying and grinding and other steps, the high-quality Lithong powder products are formed.
In order to maintain the quality of Lithopone, it is necessary to be particularly skilled and proficient in its production process, and can well master its production method to do a good job in the product.
Lithopone has many advantages, and the amount used in modern industry is also large. Each step of the baking and soaking method will play a role in improving the quality of Lithopone, and the production process is strict, so the product quality obtained by this method is also very good, which is affirmed and praised by the society.
Synthesis method of Lithopone
Knowing that the preparation method of Lithopone is mainly roasting and soaking method, let’s take a look at its synthesis method:
The natural barite containing more than 95% barium sulfate and anthracite were mixed with 3:1(mass), crushed to a diameter of about 2cm or less, and entered the reduction furnace. The furnace temperature was controlled to 1000 ~ 1200℃ in the front section and 500 ~ 600℃ in the back section. The reduction furnace was rotated at the speed of 80s per revolution, and the reaction conversion rate was 80% ~ 90%. The obtained barium sulphate enters the leaching device, and the temperature is controlled above 65℃ to obtain 701% barium sulphate content, then enters the clarifying barrel, after clarification, zinc sulfate is added to react, and the zinc sulfate content is controlled to be more than 28%, pH=8 ~ 9, and the mixture of barium sulphate and zinc sulfide with a density of 1.296 ~ 1.357g/cm3 is obtained. The reaction liquid was filtered by plate and frame pressure to obtain filter cake lithopone with water content not more than 45%, which was baked into a dry roasting furnace to change the lithopone crystal shape, and then pickled with sulfuric acid at 80℃. Finally, it is washed by water, added color fixing agent, pressed filter, dried and ground.
Post time: Sep-30-2022