There are no mica national standards in China, and the current building materials industry standards are: JC/T 585-1995 stripping mica, JC/T 595-1995 dry grinding mica powder, JC/T 596-1995 wet grinding mica powder, JC /T 815-1996 broken mica, and JC 467-92 synthetic mica pearlescent pigment, JC 468-92 high pressure boiler water level meter with mica film.
Stripping mica is divided into dielectric stripping and insulating stripping according to the application. All kinds of stripping strips are divided into several models according to the effective rectangular area. Each type of stripping sheet is divided into two grades according to the area and thickness distribution and surface features; dry grinding mica The powder is divided into coarse powder according to particle size: 900, 450, 300μm and fine powder 150, 75, 45μm; wet grinding mica powder is divided into 30, 45, 75, 90, 125μm products according to particle size, and the product is sieved for each particle size grade. The remaining amount, sand content, loss on ignition, loose density, water content, whiteness, etc. are also specified; crushed mica products are classified into I, II, and III according to their use requirements, and Class I is used for papermaking non-calcination. Type powder mica paper, class II is used for making calcined powder mica paper, and class III is used for grinding mica powder. The fineness of the product and other technical indicators are detailed in the standards.
According to the nature and type of raw materials entering the plant, there are different methods of mineral processing . The flaky mica is usually selected by hand selection, friction selection and shape selection. The crushed mica is separated from the gangue by air separation, hydrocyclone sorting or flotation. The mica beneficiation process varies according to the origin and the nature of the ore. The process is divided into dry process and wet process. The principle process is as follows: dry beneficiation process: raw ore → coarse crushing → decontamination → fine crushing → sorting → product super fine crushing → Classification → packaging. Wet dressing process: raw ore → washing → coarse crushing → fine crushing → grinding → sorting → product dehydration → drying → classification → packaging Guangdong Xinhui Huanyu mica wet processing plant process: flake mica → wheel mill → slurry Purification → storage → product dehydration → drying → classification → bagging.
A crushed mica mine in Jiangxi can obtain a concentrate with a muscovite content of 99% through crushing→grinding→de-sludge (-10μm)→flotation (one coarse and two fine)→superfine grinding process. The final recovery rate is 81. %.
The purification process of a sericite mine in Hunan is crushing→grinding→flotation (one coarse and two sweeping five selection process)→filtration→drying→bagging.
The crushing and grinding equipment is commonly used in various jaw crushers , claw crushers , ball mills , rod mills, wheel mills, pulverizers , etc.; grading equipment commonly used vibrating screens, plane rotary screens, cylinder screens, high square screens , spiral classifier, cyclone, etc.; sorting equipment commonly used vibration air sorting machine, chamber air sorting machine, shape air sorting machine, flotation machine, hydrocyclone and special for shape and friction sorting Equipment, etc.
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