At present, as the mainstream supply and demand of sand and gravel market, machine-made sand provides strong resource support for infrastructure construction, water conservancy and hydropower, chemical industry, etc. With the development of economy, mechanism sand also put forward higher requirements.
1. Machine-made sand must meet construction standards
The "General Specification for Concrete Structures" has made mandatory provisions for sand and gravel materials for structural concrete and will be implemented on April 1, 2022. The announcement stated that the specification is a mandatory engineering construction specification, and all provisions must be strictly implemented:
- 1. The firmness index of sand should not be greater than 10%; for concrete with impermeability, frost resistance, corrosion resistance, wear resistance or other special requirements, the mud content and mud block content of sand should not be greater than 3.0% and 3.0% respectively. 1.0%, and the firmness index should not be greater than 8%; the mud content and mud block content of high-strength concrete sand should not be greater than 2.0% and 0.5% respectively; machine-made sand should be based on the methylene blue value index of stone powder and the flow ratio of stone powder. The indicator controls the stone powder content.
- 2. Sea sand for concrete structures must be purified.
- 3. The chloride ion content of sand for reinforced concrete should not exceed 0.03%, and the chloride ion content of sand for prestressed concrete should not exceed 0.01%.
It can be seen from the regulations that the state has made mandatory regulations on the firmness of sand and gravel, mud content and mud content, chloride ions and other indicators, and the standard also puts forward technical requirements for the application of machine-made sand. However, judging from the current development situation, some industry manufacturers do not pay attention to the quality of sand and gravel, resulting in uneven quality of sand and gravel in the market and a lack of high-quality sand and gravel. To this end, in order to produce high-quality sand and gravel, sand and gravel manufacturers need to have a complete and advanced production line to support.
2. Machine-made sand must have a complete and advanced production line
A complete set of manufactured sand production line includes vibrating feeder, jaw crusher, cone crusher, Sand Making Machine, vibrating screen and belt conveyor. As the core equipment of machine-made sand, jaw crusher, cone crusher and sand making machine, whether the technology is advanced or not is related to the quality and quality of sand and gravel, which is also a key factor in whether it can produce sand and gravel that meets the national standard.
1. Jaw Crusher
As the "pioneer of gravel", the jaw crusher plays a primary role in crushing. The large stones are evenly sent to the jaw crusher by the vibrating feeder through the silo for coarse crushing.
Jaw crushers are also called "Tiger's Mouth" because of their simple structure, large crushing ratio, reliable operation and convenient maintenance. They are widely used in crushing operations in mining, chemical, metallurgy and other industries. Bellian mining machinery manufacturer's "CJ Series Jaw Crusher" has received a good response from the market due to its advanced technology and excellent motion parameters.
2. Cone Crusher
If the jaw crusher is the primary crushing, then the cone crusher is the secondary processing of the primary crushed stone. Cone crusher is mainly aimed at medium and fine crushing of hard stone, with large production capacity, high crushing efficiency, energy saving and environmental protection. In addition to providing continuous production capacity, it can also maximize dust removal and noise reduction, which meets the requirements of national environmental protection standards.
Cone crusher is mainly aimed at the crushing of hard materials. If it is soft material, it can be replaced by impact crusher.
3. Sand making machine
After the primary and secondary crushing, the stones that meet the particle size requirements are sent to the sand making machine by the finished belt conveyor. The sand making machine prepares rocks, mine tailings or industrial waste particles with a particle size of less than 4.75mm. The so-called machine-made sand.
The sand making machine is the equipment used for artificial sand making. According to the current application degree and scope of the industry, the impact sand making machine is the most widely used equipment. Bellian machine HVI impact sand making machine is a typical representative product on the market.
In the actual production process, the output of the sand making machine is related to many factors, such as the hardness of the material, the humidity, the fineness of the finished sand, etc., which will affect the output and quality of the sand making machine. Sand and gravel manufacturers should not only pay attention to the selection of materials, but also pay special attention to the selection of sand making equipment. Because of the excellent equipment configuration, it can achieve the production requirements of removing soil and other impurities contained in the raw materials, easily breaking the rock into spherical particles, and controlling the content of stone powder within a reasonable range.
3. Machine-made sand must meet the environmental protection requirements of the site
In addition to the complete production line, the site construction and environmental protection of the production line are also issues that manufacturers need to pay attention to.
1. Venue requirements
If we choose a fixed production line, we must choose good geological conditions and be close to the material supply to facilitate material supply. On the premise of ensuring that the water quality, quantity and power meet the needs of production and living, the site should be as close to the water source and power source as possible. In addition, improving and convenient transportation will also save the production cost of enterprises to a certain extent.
2. Environmental protection
The whole process of mining, crushing, screening and sand making in the sand making production line is not only open-air operation, but also generates noise, dust, sewage and other pollution sources. specified operation. When necessary, the crushing, screening and sand making parts can be closed to achieve the purpose of dust prevention and noise prevention.
Bellian mining machinery manufacturer proposes a set of EPC solutions, which implement the whole process or several stages of contracting from project design, procurement, construction, trial operation, etc., which can perfectly solve the problems encountered by sand and gravel manufacturers in the production process .
Finally, with the huge demand for machine-made sand and the introduction of national mandatory standards and specifications, sand and gravel manufacturers need to choose high-quality production equipment, continuously improve process levels and production standards, and meet the construction needs of standard specifications by improving product quality , in order to obtain a steady stream of wealth.
