What is White Carbon Black and it's Manufacturing Method？

 

About White Carbon Black

White carbon black is a general term for white powdered X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica and ultra-fine silica gel, but also including powdered synthetic aluminum silicate and calcium silicate. Silica is a porous substance whose composition can be represented by SiO2·nH2O, where nH2O exists in the form of a surface hydroxyl group. Soluble in caustic soda and hydrofluoric acid, insoluble in water, solvents and acids (except hydrofluoric acid). Characteristics are high temperature resistance, non-flammable, tasteless, with good electrical insulation.

 

 

The Relationship Between White Carbon Black and Carbon Black

In the 1840s, with the mass production and application of automobile tires, a large amount of industrial carbon black needs to be consumed. At that time, industrial carbon black was made of petroleum as raw materials, and a large amount of oil was consumed during the preparation process. In order to avoid the risk of oil embargo, Germany in World War II urgently needed a reinforcing additive that could replace carbon black for rubber tires. The Degussa Group (now Evonik Industries) began developing carbon black replacement fillers for the tire industry in 1941. After research and development, a high-temperature hydrogen-oxygen flame hydrolysis method was created to successfully produce ultra-fine particles of silica. These particles appear white and are used as the main substitute for carbon black, which is subsequently called white carbon black. Therefore, white carbon black and carbon black are two completely different products. The reason why white carbon black is also called silicon dioxide is that the main component of it's silicon dioxide.

 

Application and Properties of White Carbon Black

White carbon black has a wide range of uses, and different products have different uses. As a good reinforcing agent for synthetic rubber, its reinforcing property is second only to carbon black, and even better than carbon black if it is super-refined and properly treated.

 

(1) For Plastic Products

 

Adding white carbon black into the resin can improve the moisture-proof and insulating properties of the resin. Filled in plastic products, can increase the resistance to slip and oil resistance. Filled in silicone resin, it can be made of plastic resistant to more than 200℃. White carbon black can be used as a filling material in polyethylene, polypropylene, polybutene, epoxy resin and other plastics, which can improve the elastic strength and wear resistance of plastics, as well as the thermal stability of hardness.

 

(2) For Rubber Products

 

 

2.1 Tyre

White carbon black can extend the service life of automobile tires.Because of the high fever calorific value of carbon black, foreign car tires used for highways also tend to add white carbon black. At present, the requirements of the international market for bicycle tires are increasingly diversified, such as colorful tire edges and fancy new varieties such as flash rings, which are produced with white carbon black instead of carbon black.

 

2.2 Shoes

In the production of rubber shoes, people's rubber shoes, rain boots, sports shoes, travel shoes, fitness shoes, ballet shoes, etc., not only require fastness, but also require beautiful colors, comfortable and lightweight. White carbon black not only has good reinforcement, wear resistance, non-slip and upper adhesion, but also a good light-colored reinforcing material, so it plays an important role in the development of shoes to provide the quality and style of shoes.

Due to a series of advantages of white carbon black products, it can be widely used in many fields. Rubber products white carbon black is used in colored rubber products to replace carbon black for reinforcement to meet the needs of white or translucent products.

At the same time, white carbon black has strong adhesion, tear resistance and heat resistance and aging resistance, so it can replace some carbon black in black rubber products to obtain high-quality rubber products, such as off-road tires, engineering tires and so on.

 

Preparation Method of White Carbon Black

White carbon black was prepared by precipitation method using non-metallic ore and its extension as silicon source. The key technology is the conversion of crystalline silica and silicates into amorphous silica. The main raw materials are wollastonite, opal, olivine, ophiolite, kaolin, hard kaolin, coal gangue, fly ash and so on.

 

(1) Kaolin or hard kaolin as raw materials First, the kaolin or hard kaolin is crushed to 50~60 mesh, and then roasted at 500~600℃ for 2 hours, and then the roasted soil and 30% concentration of industrial hydrochloric acid according to 1:2.5 (weight) ingredients, at about 90℃ for 7 hours, after neutralization, filtration, washing, drying to obtain white carbon black.

 

(2) Use coal gangue or fly ash as raw materials The coal gangue or fly ash is first crushed to a particle size of less than 120 mesh, and then divided into two steps: The first step is to produce sodium silicate: the pulverized coal gangue or fly ash and soda ash are mixed evenly according to the weight ratio of 1:50, and the sodium silicate is obtained by high temperature smelting (1400~1500℃, 1 hour), water extraction leaching (above 100℃, 4~5 hours), filtration to remove impurities, and concentration of filtrate to 45~46 degrees. The second step to produce white carbon black: Sodium silicate is first prepared into water glass solution (modulus of 2.4~3.6, SiO2 content of 4~10%), and then in 5~20% sulfuric acid acid leaching (28~32℃, 8~16 hours), and then heating to 80℃, stirring, adjusting the PH value to 5~7, curing for 20 minutes, and then filtered washing, drying, sorting, white carbon black. The white carbon black is active and has high purity.

 

The first part of the two methods is to crush the material (kaolin and coal ash), this part is a very important role in the preparation of silica.

 

Product Recommendation

Because neither kaolin nor coal ash need to be processed to a very small fineness when preparing white tower black, we recommend YGM Raymond mill for you.

 

 

 

YGM Raymond Mill

Capacity:0.2~50 t/h

Max Feeding Size:35 mm

Finished powder size:50~325 mesh

 

Advantage of Raymond Mill

1. Reasonable structure, small footprint, solid system.

 

2. Compared with other mills, Raymond mill has a high pass rate -99%.

 

3. Adjustable particle size: 80-325 mesh

 

4. The main transmission device of Raymond mill adopts closed gear box and pulley, which ensures smooth transmission and reliable operation.

 

5. The important parts are made of high quality castings and profiles to ensure the durability of the entire equipment.

 

6. The electrical system adopts centralized control, and the mill can basically achieve unmanned operation and easy maintenance.

 

Grinding Process

When Raymond mill works, the large block raw materials are broken to the required feed particle size, and the material is transported to the storage bin by the bucket elevator, and then evenly sent to the grinding room of the main machine by the electromagnetic vibration feeder. The material entering the grinding room is scooped up by the shovel knife and is ground between the grinding roller and the grinding ring, and the air is blown into the grinding room from the shunt disc. The pulverized powder is sent to the analysis chamber, after the separation of the analysis impeller driven by the speed regulation motor through the transmission device, the large particle material falls back to the grinding chamber, the re-grinding, the qualified fine powder with the air flow into the finished cyclone powder collector, separated from the air, and discharged from the discharge port into the finished product.