What should be paid attention to when processing quartz optical materials?

The following matters should be paid attention to when processing raw materials of quartz optical materials:

Raw material selection

Purity requirements: Quartz optical materials require extremely high purity, so Shi Ying ore with extremely low impurity content should be selected. For example, semiconductor-grade high-purity opaque Shi Ying glass requires that the total amount of 16 impurity elements such as aluminum, iron, calcium and magnesium should not exceed 20 μ g/g.

Particle shape: The particle shape of Shi Ying should be as round as possible. Irregular and sharp-edged particles will increase the specific surface area and oil absorption rate, which will reduce the fluidity of raw materials after mixing, increase the production cost and affect the performance of the plate.

Color and transparency: according to the product demand, there should be no obvious black spots, yellow skin and other miscellaneous spots on the white and light-colored board surface; Black, gray board face, can't have obvious white spots. For optical materials that need light transmission, quartz sand with high transmittance should be selected.

pretreatment

Crushing and sieving: Crushing and sieving the quartz stone raw ore to remove oversize or undersize particles, so that the particle size of Shi Ying meets the requirements of subsequent processing. In the process of crushing, attention should be paid to controlling the crushing strength and frequency to avoid producing too much fine powder and impurities.

Ore washing: remove dirt, dust and other impurities on the surface of ore by scrubbing and washing. The combination of mechanical stirring and water washing can be used to ensure the clean surface of ore. For some impurities that are difficult to remove, chemical treatment methods can be used, such as acid washing and alkali washing, but attention should be paid to controlling the concentration of chemical agents and treatment time to avoid affecting the performance of quartz stone.

workpiece process

Magnetic separation and flotation: magnetic separation can separate weakly magnetic impurity minerals from quartz stone by magnetic field; The flotation rule is to separate quartz stone from impurity minerals by adding flotation reagents, so as to obtain high-purity quartz stone. In the process of flotation, according to the characteristics of ore, suitable flotation reagents, such as collectors and foaming agents, should be selected, and process parameters, such as reagent dosage and flotation time, should be adjusted.

Drying and dehydration: the drying temperature and time should be reasonably adjusted according to the nature and water content of quartz stone, so as to avoid structural changes or performance degradation of quartz stone caused by too high temperature or too long time. At the same time, it is necessary to ensure that the drying equipment is well ventilated so that the water can be fully evaporated.

Quality inspection and control

Establish testing system: Establish a perfect quality testing system, and strictly test raw materials, including chemical composition analysis, particle size analysis, whiteness detection, impurity content detection, etc. Regularly calibrate and maintain the testing equipment to ensure the accuracy and reliability of the testing results.

Process monitoring: in the process of processing, all links should be monitored in real time to find and solve problems in time. For example, in crushing, grinding, flotation and other links, it is necessary to regularly sample and test, and adjust the process parameters according to the test results.

Environmental protection and safety

Environmental protection measures: adopt advanced environmental protection equipment and technology, such as waste water treatment equipment and waste gas purification equipment, etc., to treat the waste water and waste gas generated in the processing process to ensure that the discharge reaches the standard. Classified collection and treatment of solid waste, recycling as far as possible, reduce environmental pollution.

Safety management: establish a perfect safety management system, strengthen safety training for employees and improve their safety awareness. Set up obvious safety warning signs in the processing workshop and equip with necessary safety protection equipment, such as safety helmet, protective gloves, protective glasses, etc. Regularly inspect and maintain the processing equipment to ensure the normal operation of the equipment and avoid safety accidents.