Huangshi City Friction Material Raw Material Association | Voice of Friction Materials, Issue 3, 2016

Newsletter

1. On July 6, due to the recent heavy rainfall, various regions across the country have been severely affected. Wang Yao, the chairman of the China Friction Sealing Association, sent a message of condolence to the member companies and wished everyone to overcome the difficulties.

2. On August 18, at the invitation of the Huangshi City Enterprise Federation's Friction Material Raw Material Branch, Professor Lei Shaomin from the School of Resource and Environmental Engineering, Wuhan University of Technology, came to Huangshi and gave a special lecture on "Development Dynamics and Strategic Considerations of High-Purity Quartz for Key Basic Materials" at the Sanya Hotel in Daye for the branch's personnel. The lecture was attended by Fu Shunyu, the secretary-general of the Huangshi City Enterprise Federation and the Entrepreneurs Association. Zhang Huanming, the director of the Huangshi Economic and Information Commission, also exchanged ideas and dined with Professor Lei.

3. From August 26 to 29, some member companies sent relevant personnel to participate in the "2016 China Non-Metallic Mineral Industry Technology Seminar and Trade Expo" held at the Kunshan International Exhibition Center. Among them, Yixin Company and Duxin Company arranged booths for exhibition, while Haina Company, Qifa Company, and Lianyou Company arranged personnel for observation.

Main Uses and Quality Requirements of Kaolin: The plasticity, cohesiveness, certain drying strength, sintering properties, and whiteness after firing of kaolin make it a primary raw material for ceramic production. Its excellent process performance, such as white, soft, highly dispersible, adsorptive, and chemically stable flaky particle shape, allows for widespread application in the paper industry. Additionally, calcined kaolin is also widely used in rubber, plastics, coatings, chemicals, petroleum refining, refractory materials, pesticides, and aerospace. The table below lists the main uses of kaolin.

Main Uses of Kaolin

Application Field Main Uses
Ceramic Industry Daily ceramics, sanitary ceramics, electrical ceramics, chemical corrosion-resistant ceramics, arts and crafts ceramics, special ceramics, etc.
Paper Industry Filler for paper, coating or pigment for coated paper, coated white cardboard, etc.
Coatings Industry Filler and pigment for coatings
Refractory Materials and Cement Crucibles for optical glass and glass fiber, refractory bricks, molds, refractory mud, white cement, etc.
Plastics, Rubber, Cables Fillers for rubber and plastics, insulating fillers for cables
Petrochemicals Petroleum cracking catalysts, molecular sieves, adsorbents, etc.
Pharmaceuticals, Light Industry Adsorbents, pharmaceutical coatings, additives, bleaching agents, cosmetics, pencils, pigments, etc.
Agriculture Carriers for fertilizers, pesticides, insecticides, etc.

Different application fields of kaolin have different quality requirements. In terms of chemical composition, kaolin used for paper coatings, radio ceramics, refractory crucibles, and petrochemical carriers requires Al2O3 and SiO2 content close to the theoretical values of kaolinite; daily ceramics, sanitary ceramics, and white cement rubber fillers can have slightly lower requirements for Al2O3 content, while SiO2 content can be higher as appropriate. Cable fillers require not only high purity of kaolin but also high volume resistivity. There are also different allowable content requirements for harmful components such as Fe2O3, TiO2, and SO3, and the allowable values for CaO, MgO, K2O, and Na2O vary by use. In terms of physical properties, the focus of requirements varies significantly across application fields. Paper coatings mainly require high whiteness, low viscosity, and fine particle size; the ceramic industry requires good plasticity, forming performance, and firing whiteness; refractory materials require high refractoriness, while the enamel industry requires good suspension properties.

My name is Precipitated Barium Sulfate, this is my resume.

Precipitated barium sulfate is one of the main varieties of barium compounds. It is widely used as a raw material and filler in pigments, coatings, inks, paints, rubber, and plastics, and is also used as an expanding agent for cathode plates and a contrast agent for the digestive system. It is also a raw material for manufacturing other barium salts.

Chinese Name: Precipitated Barium Sulfate,

English Name: Precipitated Barium Sulfate

CAS No.: 7727-43-7; Chemical Formula: BaSO4;

Molecular Weight: 233.39; Relative Density: 4.5 (15℃)

Mohs Hardness: 3-3.5; Specific Gravity: 4.0-4.6;

Main Component: Pure product; Appearance and Properties: White orthorhombic crystals.

Melting Point (℃): 1580℃. Transforms into monoclinic crystals at 1149℃. Tends to clump when dried.

Solubility: Insoluble in water, insoluble in acid. Its solubility in water is only 0.0024g/100g water. Soluble in hot concentrated sulfuric acid. Insoluble in water, ethanol, and dilute acids. Clumps when dried. Industrial precipitated barium sulfate itself is non-toxic, but if it contains soluble barium compounds, it can cause poisoning.

Preparation: It is prepared by mixing barium sulfide solution with a solution of Glauber's salt after removing calcium and magnesium, and reacting at 80℃ to generate a precipitate, which is then filtered, washed with water, and acid-washed, adjusting the pH to 5-6, followed by filtration, drying, and grinding. It can also be obtained by reacting barium yellow halide with Glauber's salt solution.