Mica Processing is a common process for the preparation of mica for industrial applications. The minerals in the mica group are phyllosilicates, which means that they show a two-dimensional sheet structure. They are common throughout all major rock types. The formula of a mica is XY2-3Z4O10(OH,F)2, where X represents the oxidation state of Si, Y represents cat mica theo yeu cau the halide state of Al, and Z represents the ion. The mineral composition is given in the table below.
Imerys uses a wet route to process altered rocks. The process produces blocks of mica, ranging from blocky to finely delaminated. The dry route, on the other hand, produces a variety of mica grades, depending on the particle size distribution and aspect ratio. Imerys has five mica deposits located in stable countries. This proximity to the customer base benefits the company in terms of freight economics and allows it to operate lean supply chains.
The use of mica in various industries dates back to prehistoric times. Its properties include the ability to act as a reinforcement and reduce the warpage of thin plastic frames. Its high aspect ratio means that it imparts the highest level of gas and moisture barrier performance to thin plastic frames. Mica is also very durable, providing good rheology and good application conditions. Mica can withstand high temperatures without loss of functionality. The following are some of its applications.
Micronising and milling are two ways to make mica. Dry milling is a common method, but some applications require ultra-fine particles. Micronising mica is often obtained by jet air milling. Mica can also be surface treated to improve specific attributes. Mica processing techniques are highly versatile, requiring a high level of skill. The knowledge of mica processors can improve business performance in the manufacturing & processing machinery industry.
While mica mining is an incredibly important and popular process, it is also a risky industry. Children working in the industry face high risks of snake bites and have to work in dangerous and unsanitary environments. In addition to being dangerous, mica miners have to deal with respiratory illnesses, such as silicosis, as well as skin infections. Mica mining is also illegal in many countries and regions, which makes it essential to be aware of its risks and benefits. Mica Processing Companies can help reduce the risk of child labour and improve working conditions in the industry by carrying out due diligence.
The Global Workplace Standard for Mica Processors is an international reference document for mica processing units across the world. It is based on the Minerals Due Diligence Standard and the initial Workplace Standards developed by the Responsible Minerals Initiative. The Standard was reviewed by Elevate, an international auditing company, which evaluated the standard. It compares favorably to the SMETA and SA8000 standards. Environmental criteria include impact on biodiversity and adjacent communities.
The process begins with the dry grinding of mica in high-speed hammer mills. Mica is grinded by a hammer mill in a closed circuit with an air separator, which returns the oversize to the grinding process. The fine mica is then screened to remove oversize particles. Various sized fractions of mica are then bagged and stored. Once the process is complete, the mica is ready for marketing.