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Processing technology of kaolin raw ore

Release time:2021-09-02 14:33:30  Number of views:

The production and processing technology of kaolin raw ore depends on the characteristics of the raw ore and the final main use of the product. There are two types of processes used in industrial production: dry process and wet process. Generally, hard kaolin is produced by dry process, while soft plastic kaolin is produced by wet process.

The dry process in a mineral processing plant is a simple and economically developed production and processing process. After the mined raw ore is hammered to 25.4mm, it is fed into the cage crusher to reduce the particle size distribution to 6.35mm. The warm air in the cage crusher reduces the water content of kaolin from 20% to 10%. The crushed iron ore is further ground by a blowing inspection vertical mill equipped with a centrifugal separator and dust collector. This process can remove the vast majority of sand and gravel, and the product is generally used as a low-cost filler in the vulcanized rubber, plastic, and paper industries. When used in the papermaking industry, this product can be used as a filler for areas where the ash content of the filler layer is less than 10% or 12%, and the color regulation of the product is not high. When the dry method has high requirements for the fineness of the product, it is necessary to conduct a dry test for iron removal of the product with the output rate of the vertical mill. The advantage of dry process is that it can eliminate the entire process of product dehydration and dry operation, reduce the outflow of ash powder, shorten the process steps, and reduce production costs. It is suitable for drought and low water areas. But to obtain high-purity and high-quality kaolin, wet process is still necessary.

The wet beneficiation plant process includes three stages: iron ore preparation in advance, beneficiation plant production and processing, and product solution. The preparation process in advance includes seasoning, crushing, and ramming. Ramming is the process of mixing kaolin raw ore with water and thickener to make paper in a ramming machine. Ramming can disperse the raw ore and produce moderately sized kaolin coal slurry for sorting, while also removing large sand and stones. The links of the concentrator are likely to include hydropower grade classification, flotation reagents, selective inclined plate sedimentation tank, magnetic separation equipment, and organic chemical solution to remove iron and titanium residues. The products are mixed, cleaned, and separated to carry out compound leaching. The clay with high enough chroma and excellent coating characteristics is immediately sent to the leaching work without magnetic separation equipment and separation. After leaching, the addition of exposed coal in the coal slurry helps to solidify the clay minerals and facilitate dehydration. The clay used for bleaching agent is dehydrated using a centrifuge, rotary disc filter, or diaphragm filter press. Filter press or diaphragm filter press for dehydration. Anaerobic granular sludge is then dispersed into 55% -65% solid coal slurry, and then spray dryer is used to make loose fresh products. A portion of the fresh products are infiltrated into the dispersed coal slurry to form a 70% solid state, which is then transported by sea to the paper mill. Without selecting other end products, the chroma is low. Only when magnetic separation equipment, foam flotation reagent or selective inclined plate sedimentation tank are equipped in the step, can the clay products with high brightness be obtained. However, this individual work has its own advantages and disadvantages, so in industrial production, two to three collaborative steps of this process are generally chosen to facilitate the development and utilization of clay resources.

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