feldspar processing
PTMS MAGNETIC SEPARATOR
what is magnetic separation method in hindi？
In order to separate non-clay minerals and organic matter such as quartz, feldspar, mica, iron minerals and titanium minerals in kaolin, kaolin products can be produced to meet the needs of various industrial fields, except for re-election, flotation, magnetic separation and the like. In addition to purification and purification, kaolin is sometimes treated by deep processing methods such as chemical bleaching, ultrafine stripping, calcination, and surface modification.
I. Hydraulic classification Hydraulic classification includes spiral classification (separation +1mm coarse sand), sedimentation tank classification (separation +0.053mm fine sand), hydrocyclone classification (separation -0.053mm fine sand), centrifugal classifier or small diameter hydrocyclone Flow classification (for 0.002 ~ 0.010mm ultra-fine particle size classification).
Second, high gradient magnetic separation using magnetic magnetic medium to generate magnetic field strength above 1 600kA / m, remove Fe2O3 and TiO2 in kaolin, produce paper coatings and advanced ceramic raw materials.
Third, selective flocculation by the addition of flocculant, selective separation of fine quartz, pyrite, alum and other impurities, the production of blade coating grade kaolin. Commonly used flocculants are sodium hexametaphosphate, polyacrylamide, water glass and the like.
4. Chemical bleaching Adding bleaching agent such as insurance powder reduces the high-valent iron of limonite and hematite in kaolin to soluble ferrous iron, or adds oxidant to oxidize pyrite and dye impurities to improve the whiteness of kaolin.
5. Stripping In the stripping machine, the fine media ball is stirred to produce the grinding and stripping effect, so that the kaolin aggregate particles are separated into thin crystals, and the blade coated grade kaolin having a particle size of less than 2 μm and a content of more than 90% is produced.
6. Calcination When calcined at 800～1 000°C, the kaolin loses water, the phase transforms, and some impurities volatilize, improve the whiteness and insulation of kaolin, and produce cable and rubber plastic filler. Calcination is a necessary processing method for coal-based (hard) kaolin.
7. Surface Modification Kaolin is coated with a coupling agent or the like to increase its addition amount in plastic rubber, and is used for treating kaolin filler for rubber plastics.
8. Process Flow The processing of kaolin is divided into dry process and wet process. The dry method generally breaks the mined ore produced by the crusher to about 25 mm and feeds it into the cage crusher to reduce the particle size to about 6 mm. The hot air blown into the cage crusher reduces the moisture of the kaolin to about 10% from about 20% at the time of production. The crushed ore is further ground by a blown-type Raymond mill equipped with a centrifugal separator and a cyclone. The process can remove most of the sand and is suitable for processing ore with high whiteness, low sandstone content and suitable particle size distribution. Dry processing costs are low, and products are often used in low-cost fillers in industries such as rubber, plastics and paper. The wet processing process includes several stages of dispersing, grading, impurity sorting and product processing of the mud. The general principle process is: raw ore → crushing → slurry → sand removal → cyclone classification → stripping → centrifuge classification → magnetic separation (or bleaching) → concentration → pressure filtration → drying → ceramic grade or paper coating grade products.
The general principle flow of coal-based (hard) kaolin processing is: raw ore → crushing → slurry → cyclone classification → stripping → centrifugation → concentration → pressure filtration → internal steam drying → calcination → depolymerization → filler grade or paper coating Grade kaolin. Equipment continuous centrifuge, hydrocyclone, hydraulic separator or vibrating fine screen, centrifugal separator and cyclone.
