Kaolin comprehensive utilization technology (5)

It can be seen from the reaction formula that the crystal water is removed between 500 and 700 Â° C to form metakaolin, which remains in a sheet form. 925 Â°C The silicon spinel phase is then produced. 1100 Â°C It produces a mullite phase. 1400 Â°C Produce mullite.

The choice of kaolin calcination temperature depends on the application. As cable filler, chemical products, temperature should be selected 700 Â°C about. For the production of paper coatings, 800 should be selected . 900 Â°C At this time, the metakaolin formed still maintains a sheet form. When producing mullite, the temperature should be greater than 1400 Â°C . Produces high whiteness and high brightness fillers with temperature options 1000 Â°C about.

In order to increase the whiteness of the calcined kaolin, a calcining additive may be added. There are many varieties of additives, and it is necessary to rationally select additives according to the nature of the ore.

10 , surface modification

Kaolin is used for the filler of plastics, rubber, paint and cable. In order to make it easy to uniformly disperse with various organic polymer materials and to form a stronger bond, it is necessary to coat an organic coupling agent on the surface of kaolin. For surface modification. The coupling of the coupling agent to the kaolin is chemical reaction, physical adsorption or both. Commonly used coupling agents are silanes, titanates , aluminates , stearic acid and soaps thereof.

The modification method has a dry method and a wet method, and the dry method has a better effect than the wet method. Commonly used equipment is a high speed kneader. In the modified production, the kaolin is directly blended with the organic material at a certain temperature, and is carried out in a single-screw or twin-screw kneader.

The detection of the modification effect can accurately measure the coating area of â€‹â€‹the coupling agent by infrared spectroscopy. A convenient method is to use a hydrophobic method. Take a little modified product, put it into a beaker containing water, stir it with a glass rod for one or two minutes, and observe the turbidity in the water after standing still. The kaolin with good modification effect is hydrophobic, which floats on the surface of the water without sinking.

(2) The process flow of comprehensive utilization of kaolin is shown in Table 5 .

Table 5 Â Kaolin mineral processing process

Ore type

Mineral processing principle process

Hard kaolin

1. Raw ore â†’ crushing â†’ slurry â†’ cyclone â†’ centrifuge â†’ peeling â†’ bleaching â†’ paper coating grade

2. Raw ore â†’ crushing â†’ roasting â†’ slurry â†’ cyclone â†’ peeling â†’ centrifuge â†’ paper coating grade â†’ Packing level

Soft kaolin

1 . Raw oreâ†’crushingâ†’slurryâ†’cycloneâ†’selective flocculationâ†’bleachingâ†’quality papermaking, ceramic grade

2 . Raw ore â†’ crushing â†’ slurry â†’ cyclone â†’ centrifuge â†’ stripping â†’ magnetic separation â†’ paper coating grade

Sandy kaolin

1. Raw ore â†’ slurry â†’ spiral classifier â†’ sedimentation tank â†’ centrifuge classification â†’ stripping â†’ bleaching â†’ paper coating grade â†’ packing grade

2 . Raw ore â†’ slurry â†’ re-selection sand removal â†’ adjustment Â with Â Tank â†’ Flotation â†’ High-quality papermaking, ceramic grade

Rail Vehicle Structural Parts

This type of product is a rail-type passenger car structure, mainly used to form the body of the passenger car. According to the installation position, it is divided into roof structural parts, car bottom structural parts, car interior structural parts, car end structural parts and other structural parts. The finished products are used in rail passenger cars, light rail, high-speed rail and other car bodies, and can also be used in other industries.

Jilin Zexin Industrial Development Co., Ltd. was founded in 2001 with a registered capital of 5 million RMB and is a high-tech enterprise in Jilin Province. There are about 100 employees, and the company's sales volume reached 20 million RMB in 2022. The company has more than 30 sets of various equipment including 2 NC laser cutting machines, 6 NC machining centers, 8 welding machines for different purposes, NC cutting machines, NC bending machines and others. After more than 20 years of construction and development, it has formed a comprehensive enterprise of electrical system, carbon steel, stainless steel and aluminum alloy stamping, welding, machining and surface coating. The company has passed the ISO9001:2015 quality management system certification, EN15085 CL1 welding system certification, American standard AWS welding certification, and ISO/TS22163:2017 quality management system certification. It is a high-quality supplier cooperated by CRRC Changchun Railway Vehicles Co., Ltd., the core manufacturer of China's urban rail transit equipment and high-speed train.

Rail Vehicle Structural Parts,Painted Single Hole Single Tube Buckle,Painted Metal Cable Holder,The Upper End Of The Metal Ground Socket

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