Selection process of pure quartz sand

A method for preparing ultra-pure quartz sand, the production process thereof is:

1. Crushing and sieving: using natural silica as raw material, making silica into 2-6cm pieces of stone, mechanically pulverizing to make 20-200 mesh silica sand;

2. Hot acid leaching: the prepared silica sand is immersed in hot hydrochloric acid with a concentration of 25-40% and a temperature of 25-36 degrees for 60-82 hours;

3. Washing: remove the hot acid immersed sand and wash it to neutral and dry;

4. Cold explosion: Put the dried sand into a special refrigeration machine to make it reach 200-300 degrees below zero, and suddenly put it into a high-temperature furnace with a temperature of 400-550 degrees to achieve the purpose of micro-explosion. Producing numerous warp and weft cracks on the surface of the sand to melt the minerals inside the sand in the next pickling;

5. Ultrasonic vibration pickling: The cold explosive sand material is put into the ultrasonic container and washed with aqua regia acid for 6-10 hours. The purpose of ultrasonic vibration is to enhance the dissolution power of the mineral foreign matter inside the crystal nucleus;

6. High temperature dehydroxylation: The ultrasonic material after ultrasonic vibration washing is washed with pure water to neutrality and dried, and put into high temperature calcination at 1450-1600 degrees to remove low temperature impurities and hydroxyl groups.

Hanging Shoe Rack

Hanging Shoe Rack:

Hanging shoe rack is a home necessity that is used to store shoes for easy management. It takes up vertical space that can save more space than a regular shoe rack. You will not worry about all kind of your shoes in a mess. Now you can easily store and organize all your shoes, heels, sandals, and sneakers in one easy to access place. Compact-sized shoe rack maximizes minimal storage space.Simply place the over the door rack on the backside of any closet or storage door for access, storage, and organization of your favorite shoes. Also, it is easy to assemble and clean. Do not hesitate to buy one.