Graphic production process of high purity quartz sand

1. Selection of raw ore

For good products, of course, we must choose good raw materials. So, what is a good raw material? This is a question of practical knowledge. There are more ores and samples, and the experience, channels and subsequent processes have a reference to the choice of ore.

2, calcination, water quenching

Quartz is calcined at high temperature and then quenched in water. Some industry manufacturers have put this step into the follow-up process, and the principle is similar. Adjusting the calcination temperature and time requires consideration of both efficiency and cost.

3, crushing and screening

The bulk quartz is further crushed, and then sieved to obtain quartz sand of a target particle size. The grain size of quartz sand corresponding to different uses (such as quartz crucible, quartz tube, quartz crucible, etc.) is different. In general, between 30 mesh and 140 mesh.

4, three choices

Flotation, magnetic separation, and electro-election are three commonly used quartz beneficiation processes. The principle is to separate impurity minerals by using different properties of impurity minerals and quartz under flotation agent, strong magnetic field and high voltage electric field.

Common solid impurities mineral, such as feldspar, mica, rutile, iron-containing minerals may be selected by using three or more separated.

The above three beneficiation processes need to be selected from the perspective of the impurity distribution of the ore and the overall production process.

The following three pictures are magnetic separator, flotation machine and electric separator.

5, chemical treatment

Ok, the most important impurity removal step: chemical treatment. Generally, it is treated with a mineral acid and a complexing agent. Of course, there are also ingenuity, treated with inorganic bases or basic compounds.

There are many related researches on chemical treatment of quartz sand. The changes of impurity element content before and after treatment are listed. You can download the data for reference.

6, cleaning and drying

The chemically treated quartz sand is washed with high-purity water and then dried to produce a pure and pure quartz sand.

7, packaging and storage

Finally, the product is packaged and entered the warehouse.

The general packaging in the industry is referenced to the United States Unimoin, paper drum packaging, 200 kg per barrel.

Because of its high purity, high-purity quartz sand has a thirteen impurity content of less than 22ppm (American Unicom standard, domestic different manufacturers' standards are slightly different), so it has its specific use and expensive price. Pulling the tube and smashing the material will not be mentioned first. In this article, the quartz crucible is mentioned. Yes, this is the picture, scrub single crystal silica quartz crucible.

What is the use of quartz crucible? Below, for the production of scrub, oh no, silver gray pure silicon rods.

The above is a brief introduction to the basic production process of high-purity quartz sand. The text content is similar to the search on Baidu, so this article exists only as a literacy article. Other less common processes, such as gravity beneficiation, molten salt roasting, high temperature chlorination, doping purification, organic solvent leaching, high temperature and high pressure acid leaching, etc., are not described in detail herein.

A product, from the successful development of the laboratory to the stable industrial production, has a long way to go. Many times the literature was reviewed to determine the experimental protocol before a perfect experimental sample was made. It also requires many adjustments to clarify the process to ensure the stability and consistency of the batches. In the meantime, it’s not enough!