Nowadays, the Philippine government focuses on the construction of infrastructure. The Philippine government plans to invest 910 billion pesos in infrastructure construction this year, which will double by 2020, preparing for the arrival of the "golden infrastructure era".
Diokno, the Philippine Secretary of Budget and Management, said that the investment in infrastructure projects was equivalent to 4.7% of gross domestic product (GDP) in 2019. The infrastructure construction grant will exceed to 1 trillion pesos mark by 2020.
In the next year, road, bridge, airport, and railway construction spending will reach to 1.22 trillion pesos, equivalent to 5.7% of GDP. Increasing spending and upgrading infrastructure will enhance the Philippines' economic competitiveness, which is in line with the Duterte government's "big construction" plan.
With the strengthening of infrastructure construction, the demand for materials such as sand, cement, and steel is increasing rapidly. Especially for sand materials that can be used in construction, concrete, cementitious materials, and road construction materials.
In recent years, the continuous prosperity and development of the real estate industry and the perfect requirements for global urban infrastructure construction require a large amount of river sand materials. Some countries like China would import river sand from the neighbors.
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.
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.
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 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.
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.
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.
Both vibrating screen and trommel screen can be used for single or multi-stage screening of river sand. The differences between them are mainly the feeding and discharging sizes, the output, the number of screen deck, the screen size, the screening advantage, and the price of the equipment. Then we will introduce the differences below.
The most important thing you need to consider is the feed size and output while selecting the screening equipment. For the vibrating screen, the maximum feed size is 200mm, and the hourly output is between 8m3 and 800m3. For the trommel screen, the maximum feed size is 150mm, the hourly output varies from 12m3 to 350m3 (1m3sand1.35~1.45t).
The sieve layers of the vibrating screen can be selected according to the grade of the river sand materials, generally, there are double-deck, three-deck and four-deck vibrating screens being provided.
If you just want to separate the sand from the gravel, the double deck vibrating screen can meet your requirements. If the sand should be classified precisely, you need to choose the three-deck or four-deck vibrating screens. And the four-deck can meet your several sieving requirements.
Selecting the appropriate size and connecting them, from small to large with the smallest mesh at the feed port, can achieve the purpose of separating several different size sand. However, increasing length means lowering the screening efficiency, so long-sized trommel is not recommended.
The mesh sizes produced by our company are mainly 3mm, 5mm, 10mm, 15mm, 20mm, 30mm, 40mm, etc., the maximum is generally 150mm. Of course, they can also be customized according to customer's needs. Therefore, the vibrating screens can meet most screening needs.
Of course, the actual output will vary slightly depending on the mesh size and the type of the machine. So, the actual situation is subject to the actual selection. If you have any questions or needs, please feel free to contact us.
To avoid the materials blocked in the discharging port, conveyors are needed while screening. On the one hand, the conveyor can deliver the finished product to the right place for later use; on the other hand, it can raise the efficiency of the screening.
At present, the infrastructure construction is in the ascendant in Philippine. Therefore, the demand for sand is still high and will grow continually. So, improving the efficiency and quality of river sand mining has become a top priority for investors.