Silica sand process flow
Crushing:

The mined silica sand (quartz sand) ore is continuously fed into the coarse jaw crusher by the vibrating feeder for primary crushing, and then the particles after primary crushing are sent to the fine jaw crusher by the belt conveyor for re-crushing, and the crushed silica sand particles are sent to the vibrating screen for screening and grading.

Sand making:

After the screening process, the quartz sand particles that meet the feeding particle size requirements of the vertical shaft impact crusher enter the sand making machine for sand making process, and those that do not meet the requirements are returned to the crusher for re-crushing.

Screening:

The qualified silica sand particles from the sand making machine are returned to the circular vibrating screen for re-screening, the materials that meet the requirements go to the next process, and the materials that do not meet the requirements are returned to the sand making machine for sand making and crushing again;

Sand washing:

The produced silica sand is sent to the sand washing machine by the belt conveyor for cleaning, and the cleaned silica sand is sent to the finished product pile.

Calcium carbonate milling is generally divided into calcium carbonate coarse powder processing (0-3MM), fine powder processing (20 mesh-400 mesh), and ultra-fine powder processing of calcium carbonate (400 mesh-1250 mesh) and micro powder processing (1250 mesh) -3250 mesh) four types.

Stage 1: Crushing
The calcium carbonate bulk material is crushed by the crusher to the fineness (15mm-50mm) that can enter the mill.

Stage 2: Grinding
The crushed small pieces of calcium carbonate material are sent to the silo by the elevator, and then sent to the grinding chamber of the mill evenly and quantitatively by the vibrating feeder for grinding.
For fine powder processing, LM vertical roller mill, MTW European version mill and 5X European version intelligent mill can be used;
MW ring roller micro-powder mill and LUM ultra-fine vertical mill can be used for superfine powder processing; CM European coarse powder mill can be used for coarse powder processing.

Because the silicon content of river stone is relatively high, the biggest problem of the production line is that the wear-resistant parts are easy to wear, so the pebble crushing should use lamination equipment and multi-stage crushing scheme as much as possible.

Rock and crushed stone products will be initially taken away from the deposit by drilling and blasting, after which carried for further processing application. Techniques employed for rock extraction vary because of the property and location of the deposit.

The rock and stone processing mainly include crushing, grinding, screening, size classification, material handling and storage process. The screens separate large boulders from smaller rocks which don’t need primary crushing, therefore decreasing the load to the primary crusher.

As a leading company of mining equipment manufacturing, Dawn is specializing in the design and manufacture of crushing equipment, grinding equipment, sand making equipment and beneficiation equipment. The machines designed by our company are of high quality and competitive price. The mobile crusher for sale is widely used in many countries and were well received by the mine owners and quarry operators. Our mobile crusher for sale aims at satisfying the ever increasing crushing demand. It is designed based on the conception of fully adapting various crushing condition, eliminating obstacles caused by location, environment, consequently providing simple, efficient, low-cost crushing equipment.

Dawn’s portable crushing plant is a newly designed rock crushing & screening plant, which is flexible, convenient and strong mobility, can save a large construction capital and relocation. Raw materials can be reduced at the mine site without being transported again, and also can be moved with the promotional exploitation of the raw material, which saves a large number of transportation costs. Dawn company specializes in producing crusher, screen, transportation, and other rock breaking and minerals processing equipment. On the basis of the licensed technology, we optimize and introduce newly two large and three small series crushing and screening equipment.

The mobile stone crusher can be equipped with different types of crusher for different applications, for example mobile jaw crushing plant for primary crushing process, mobile impact crusher for secondary crushing process, mobile cone crushing plant for effective secondary, tertiary and fine crushing process. In addition, it can be installed with screening plant for separating various sizes of final materials. It combines all the benefits of stationary crushing equipment and fits for versatile mobile crushing applications.

According to Crushing Method( compression, splitting, breaking, shearing, impact or blow, etc.) Of Different Stone Crushers, crushers can be divied 7 types.

Physical properties of river sand
The Philippine is located on the western edge of the Pacific Plate, where there are frequent earthquakes and volcanic activities.

A large number of hard rocks are produced accompanied by the volcanic eruption, they have been impacted for a long time, and they are smooth in surface and contain less impurities. The buildings which used river sand in some reinforced concrete structures can extend their life expectancy and have stable mechanical properties.

Layer structure of river sand
The Philippine river sand is composed of conglomerate, sandstone, shale, basalt, tuff and a small amount of limestone. The solid concrete made of these sands always has uniform texture and physical strength because of the uniform size and hard physical structure.

The mud content of river sand
As mentioned above, the Philippine river sand is mainly produced by the long-term effects of volcanic eruptions, crustal movements and river impacts. For the stratums where river sand stored in are stable, there is only fewer volcanic ash in the sand. So, it’s easy to remove the mud from the sand, and the cost of processing is low.

The chloride ion content of river sand
Because most of the Philippine river sands are collected from the riverbed generated after the volcanic eruption, the colors of the Philippine river sand mostly are black or gray.

The chloride ion content is relatively low. North and central parts have the lowest chloride ion content, below 0.02% on average. It is in line with the international standard for the use of concrete in river sand.

River sand particle size
With low mud content, Philippine river sand can be directly used as building materials after simple sieving. However, some river sands in other regions are mainly larger river pebbles, then a crushing machine is recommended.

The hardness of river sand
The main component of river sand is quartz, so its Mohs hardness is 7. It can be used by mixing with other materials for its good hydrophobic and air permeability.

Based on the above analysis, the river sand in the Philippines has unique advantages in the construction of the river sand supply market due to its low mud content, low chloride ion content, high hardness and perfect particle size which is suit for construction.

The quality of the Philippine river sand is extremely high. The only drawback is that it contains less large gravel, which is not convenient for direct use as construction sand. Therefore, a screening process is needed. Good screening equipment will certainly do more with less for the huge market demand.