The rapid development of urbanization has resulted in the accumulation of a large amount of waste concrete, which not only occupies land resources but also pollutes the air and the environment. Therefore, the recycling of waste concrete has become an important issue that the government needs to solve.
Abandoned concrete blocks are high-quality concrete aggregates which have many advantages. For example, after the buildings are dismantled, the high-quality concrete blocks and silt after crushing and screening can be used as recycled coarse and fine aggregates for concrete. The fine powder can be directly used as the raw material of cement. The concrete prepared from recycled cement and recycled aggregate can enter the next cycle, which realizes zero waste discharge throughout the whole cycle.
Concrete, cement and other wastes in construction waste can be used as building aggregates and recycled brick raw materials after being reasonably crushed, screened and crushed. And the main equipment used for crushing concrete can be divided into two types: traditional fixed crusher and mobile concrete crusher, among which small crushing equipment is favored by users.
Although the compressive strength and hardness of concrete are not high, due to the porosity and the formation type, the concrete has good toughness and can buffer the crushing force, which causes low crushing efficiency. So, what kind of crusher should be selected for concrete crushing? In the process of crushing waste concrete, according to the working principle of more crushing and less grinding, it is necessary to carefully configure the concrete crusher equipment.
Jaw Crusher, also known as concrete crusher, is usually used as the primary equipment for concrete crushing. It is also suitable for metallurgy, mining, construction, chemical, water conservancy and railway sectors, and used as a device for fine and medium crushing of ores and rocks with compressive strength below 250 Mpa.
In recent years, the small jaw crusher has been favored by foreign users because of its small size, easy transportation and installation, low price, and fast profit. The models like PE-150250, PE-200350 and PE-400600 have become the best choice for customers to crush concrete.
After the rough breaking, steel and iron equipment are added to remove the steel bars and iron blocks in the waste concrete, which will eliminate the damage of steel bars and iron blocks to the equipment without affecting the production. Generally, the impact crusher, the fine crushing jaw crusher or the cone crusher is used as the secondary crushing to crush the material to less than 2 cm, and the selected granularity can be basically achieved.
For smaller discharge sizes, a three-stage crusher can be used, for example, the fine crushing crusher or the roller crusher is used to further crush the ore to less than 10 mm. In the actual production, the suitable crusher can be selected according to the size of the concrete block. It can be combined in single or multi-machine operations, both of which have the characteristics of simple operation, strong controllability and high production efficiency.
In the international environment of the crusher industry, besides the traditional jaw crusher, high-efficiency and environmentally-friendly construction concrete crusher will be the trend of future development.
In view of the characteristics of concrete waste, Henan HXJQ Machinery designed a concrete crushing equipment-mobile concrete crusher. The waste concrete after crushing can be used for reinforcing the foundation, producing bricks, cement, etc, not only achieving its values but also solving the issue of land and environment problems, which can be described as two-fold.
The mobile concrete processing station produced by HXJQ Machinery adopts multi-stage combination mode, which includes jaw crusher, impact crusher, cone crusher and vibrating screening equipment, conveyor belt, etc. Generally, the concrete crushing station is composed of a concrete crusher (sand making machine), a screening machine, a feeder, a conveyor belt, a steel frame, a drive system, an electric control system, a motor unit and the like.
The concrete material is sent into the crusher by the feeding equipment, and the crushing machine converts the large concrete into gravel. The finished product which meets the standard is transported by the conveyor belt to the stacking place, and the products which don't meet the standard will be transported by the other conveying belt to the crusher again until it is qualified.
The integrated vibrating screen, feeder and the under-belt conveyor, the vibrating screen and the crusher integrated into the vehicle can reach any position on the working site under any terrain conditions. Thus the mobile concrete crusher has many advantages like reasonable material matching, smooth flow, reliable operation, convenient operation, high efficiency and energy saving.
1. According to the driving way, it is divided into tire type and crawler type: the tire type concrete crushing and sorting machine needs semi-trailer traction to run, while the crawler type can be remotely operated with buttons. Relatively speaking, the latter is more intelligent and the price is more expensive.
2. According to the function, it is divided into crushing type and sand making type: the concrete crushing and screening machine includes a combination of crushing equipment such as jaw crusher, cone crusher and impact crusher. The sand making type is mainly equipped with sand making machine and hammer sanding machine.
The mobile crushing station can prevent and control environmental pollution, improve the ecological environment, and protect natural resources. The size and model can be designed according to the different production needs of users. According to the statistics of the HXJQ machinery, the small mobile crusher is chosen by more foreign users because of its reasonable price, high quality, convenient transition, operation and maintenance.
A project introduction of construction concrete treatment: in October 2018, a customer found HXJQ, and hoped that we could provide him with the complete equipment for breaking construction waste. Our technical manager quickly contacted him and learned that the customer had a large amount of construction waste to be disposed of.
From the perspective of economic foundation and practical operation, the technical manager recommended the fixed crushing station to him and designed a complete set of equipment suitable for his actual needs. In the end, the customer introduced the PE-400600 jaw crusher and PF-1010 impact crusher produced by our company to break the concrete waste. The finished sandstone is used for brick making, roadbed materials, etc., and the separated steel is recycled.
The pretreated concrete with reinforcing steel is sent to the jaw crusher for initial breakage by the conveyor belt, then effectively separated by the iron remover, and sent to the impact crusher for fine crushing. The crushed material is sieved by the vibrating screen. The finished material is output by the conveyor. If the material does not meet the specifications, it will continue to return to the impact crusher and break again.
The development and utilization of waste concrete as a recycled material solves the problems of a large amount of waste concrete treatment and the resulting deterioration of the ecological environment; on the other hand, it can reduce the consumption of natural aggregates in the construction industry, thereby reducing exploitation of the natural sand and gravel, which has fundamentally solved the problem of the depletion of natural aggregates and the destruction of the ecological environment because of the lack of sandstones.
Under this circumstance, the crusher plays an irreplaceable role in the recycling of materials. Whether it is the traditional fixed crusher or the latest mobile crusher, both of them have their own advantages. As long as the size of the stone produced by the equipment can meet the standard, it is a good crusher.
The cement industry is a capital-intensive and resource-intensive industry. With the convenience of international trade, overcapacity of production, rising investment, and other existing factors, many cement enterprises are suffering from increasing pressure to become more profitable. However, one of the main factors contributing to the success of an enterprise is the cost of production reduction. A sustainable cost reduction is also important for the development of cement factories. So how to minimize the production cost has become a crucial issue.
Dry method cement production is the most common cement manufacturing process in the cement industry. AGICO, as a cement plant equipment supplier in China, has been professional in building dry method cement plants for more than 20 years. Based on our experience and achievements, we believe that minimize the cement factory cost can be realized in each stage of cement production processes. For understanding, there is a cement manufacturing flow chart illustrated below:
The site selection determines the construction and operating costs of a cement factory and is difficult to change once selected. Therefore, we should be careful about it, which requires multiple surveys and repeated comparisons. Generally, site selection should be based on the following principles:
As we all know, the cement manufacturing processes can be roughly divided into three stages: raw material preparation, clinker calcination, and cement grinding. To finish these processes, we need plenty of cement equipment. They will not only affect the cost in the early stage but also affect the energy consumption and production efficiency in the subsequent cement manufacturing.
In the early time, we usually adopt a two-stage crushing system with jaw crusher as the primary crusher and hammer crusher as the secondary crusher. Compared with two-stage crushing, the large capacity crusher applied in a single stage is more expensive. However, with the more mature technology appearing, large production capacity requirements, and increasing plant scale, we find that the use of single-stage crushers will lower investment to some extent, saving in power consumption and material handling. The single-stage hammer crusher and roller crusher are both good crusher models.
Cement ball mill and vertical roller mill are two grinders commonly used for cement grinding and raw material grinding. Compared with conventional ball mills, the vertical roller mill and the ball mill with high-efficiency separator are more energy-saving. Especially for the vertical roller mill, the motor only consumes about 7 8 kWh/ ton.
Clinker calcination can be divided into preheating, precalcining, burning, and cooling, four steps. It is the most important thermal energy consumption part of the cement plant. The preheater, precalciner, cement kiln, and cement cooler are the equipment we mostly used in this stage. With the development of technology, the transfer from the wet method to the dry method of cement manufacturing reduces thermal energy. Next is the upgraded adding of suspension preheater and precalciner. Their heat consumption is shown in the following table:
Cement factory layout has a significant effect on the total energy consumption and civil engineering cost. So preparing a reasonable and effective layout design is crucial before establish a cement factory. In principle, the more compact the layout of cement plant, the lower the investment, as a compact layout design can reduce the land cost, shorten the distance of conveying equipment and material transfer distance, decrease the number of wires, cables, and water supply lines. Besides, an approach of good design would include:
These aspects discussed above are of the most critical nature. As someone new to build a dry method cement factory, you can reduce the total investment by controlling these areas. Although the cost reduction is possible in other areas as well, it needs us to continuously explore and summarize.
AGICO Group is an integrative enterprise group. It is a Chinese company that specialized in manufacturing and exporting cement plants and cement equipment, providing the turnkey project from project design, equipment installation and equipment commissioning to equipment maintenance.
The tertiary crusher is with wide applications range and advanced international technology, and it is the most effective and reliable crushing machine at present, widely applied to fine crushing and medium crushing of grinding materials, refractory materials, cement, silica sand and steel shot.
Five designing features of the high efficient tertiary crusher or fine crusher: high line speed, abrasion resistance materials, machine structure, design of the grid plate and the influence of rigidity attrition crushing. All these features make the fine crusher able to effectively control the secular stability of discharging granularity. Tertiary crusher also has advantages of high crushing efficiency, low consumption, dust prevention, long service life of quick-wear parts, low cost of fittings, high running rate and simple maintenance.
Advantages and features of the high efficient fine crusher: materials entering the cavity successively fall on the high speed spinning hammer and get crushed for the first time at the hammering zone under the action between the hammer and counter board. After high-frequency hammering and striking, materials fall on the median septum piling up and then they slide down on the bottom dumping disk of the high speed spinning rotor. Then materials are thrown to the impact plate at high speed and then are enforced to be impact, crushed and ground when passing the mobile board hammer.