Concrete is one of the main civil engineering materials at the present times. According to a certain proportion, cementing material, aggregates, skeletal materials and water are mixed into configuration. By mixing and vibration, the concrete is molded and then conserved in certain conditions. The concrete features with abundant of raw materials, low price, and simple production process. For the dosage are more and more, the concrete also features with high compression strength, well durability, wide strength grade, etc. These features make the range of application of the concrete quite wide. The concrete is not only used in all kinds of civil engineering, but also shipbuilding industry, machinery industry, marine development, geothermal projects.
In the preparation of concrete, according to the requirements of the engineering, such as workability, strength and durability, the raw materials should be chosen reasonably and the proportion should be confirmed to achieve the economical and applicable purpose.
According to the different requirements and conditions in construction, the concrete can be concentrated mixed in the construction site or station. Automatic fall type mixer can be used for the concrete mixture whose liquidity is better. Mandatory mixer is used for the concrete mixture whose liquidity is lower or the harsh concrete. Before mixed, the materials should be prepared according to the proportion and the weighting error should be controlled. Both the mixing procedure and time have influence on concrete quality so that the mixing procedure and time should be under strict control to make various components well-proportioned.
Transmission and irrigation built: the concrete mixture can be transported to the construction site by hopper, rubber belt conveyor or mixing truck. The way of built filling can use manual work or the mechanical work. Using the concrete pump to transport and irrigate concrete mixture, this method features with high efficiency, which can reach hundreds of cubic meters per hour. Both the cast-in-site concrete engineering and prefabricated part, should confirm the density of the irrigation built concrete. The methods mainly consist of: vibrating screening, centrifugation, extrusion and vacuum operation. The vibration can be left out if the liquid concrete is mixed with some efficient water reducer.
The main purpose of the maintenance is to create the proper temperature and humidity conditions so that the harden speed of normal concrete can be confirmed or sped up. Different maintenance methods of concrete have different effects on the performance of concrete. The common maintenance methods consist of: natural maintenance, steam curing, dry hot and humid maintenance, autoclaved maintenance, the electric heating maintenance, infrared maintenance and solar maintenance. The curing period is the time of maintenance. In order to be compared with conveniently, the rule is that test specimens for determining the concrete performance must be maintained in standard conditions. The standard condition of maintenance in China is that the temperature is 20±3℃ and the humidity is no less than 90%

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Aggregate classification
According to the kinds of stones, the aggregate can be classified into many kinds, such as basalt aggregate, granite aggregate, limestone aggregate, river stone aggregate, cobble stone aggregate, sand stone aggregate and slate aggregate etc.
According the aggregate heavy degrees, the aggregate can be classified into coarse aggregate and fine aggregate.
Fine aggregate: the grain size is below 4.75 mm, also called sand. According to the source, there are natural sand and artificial sand. The natural sand is the rock particles whose grain size is below 4.75 mm, formed by natural weathering, potamic transport, separation and stockpiling. The artificial sand is the general terms of mechanism sand and mixing sand that go through the soil removing .
Coarse aggregate: the grain size is above 4.75 mm, also called rock. The common coarse aggregate are gravel and pebble. The gravel is the rock particles whose grain size is above 4.75 mm, formed by the natural rock or river stone crushing and sieving.
Aggregate product line equipment
The aggregate production equipments mainly consists of efficient crushers, such as Jaw Crusher, Impact Crusher and cone crusher. There are other auxiliary equipments, such as storage bin, vibrating screen, feeding machine and belt conveyor.
Some aggregates need auxiliary process, including washing, swirling sand washing machine and rotary screen. The main purpose is to make the final products more clearer. Thick powder separator and dust-cleaning apparatus can be equipped if using dry production process.
Aggregate production processing
Material taking: through blasting, the qualified rocks are fractured into pieces for crushing.
Conveying: after blasting, the stones are transported to the broken factory by tip lorry or belt conveyor. Or the conveying is the internal materials input process in each links.
Crushing: Using all kinds of crushers or rod mill or Ball Mill to crush the materials so that the materials will be smaller to meet various specifications demands.Crushing is the most important link in aggregate production process and is also where the aggregate production equipment fully plays its role. In addition to various types of crusher and auxiliary equipments, the VSI5X new sand machine researched by SBM Machinery is the necessary machine for producing the quality sands.
Screening: Sorting in the production process. Through various specifications of vibrating screen, the qualified materials are selected out then transported to the corresponding materials heaps. The unqualified materials are sent to crushers for next crushing.
Drying: Drying the aggregates which size and shape are qualified, in order to make the moisture content reach to relevant requirements. Generally speaking, the coarse aggregate needs natural drying. The fine aggregate(coarse sand and fine sand) needs dryer equipments.
Storage: The produced aggregates, which meet all kinds of specification requirements, are stored separately. For the different requirements for containing moisture and operating and environment condition, the open storage can be used and the storage bin or vertical shaft can be used for storage.
In the six working procedures, conveying, crushing and screening often are repeated. The processing flow can be summarized as screening repeated, crushing repeatedly and directional conveying.
Aggregate is granular loose materials whose total volume is the 60% ~ 80% of concrete volume. As the main raw material of concrete, the aggregate plays a role as skeleton or support in the concrete.The aggregate plays an important role in building. When mixing the materials with water, the cement will be thin paste after mixing. If the aggregat is not added, the cement will not be able to shape and not available. So we can say that the aggregate is very important.

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Iron Ore Production Line:
Most iron ore that is mined can be used for making steel. So we need the extraction of the pure metal from its ore. The extract the metal through ores, several physical and chemical methods are employed. The method used depending on chemical properties and nature from the ore from which it will be extracted.
Iron ore production line entails four main steps:
1. Crushing and grinding of the ore.
2. Concentration or dressing of the ore.
3. Reduction to free metal.
4. Purification or refining of the metal.
Ore beneficiation technology:
(1) Magnetite Dressing technology
It is mainly used for dressing magnetitewith low taste. Because the rocks have a strong magnetism and easy to grinding, most of the magnetic ore-dressing plants adopt one stage and many stages process for its crushing and grinding. Later, our country independently researched and developed eternal magnetization technology for the magnetic separator. After the 1960s, the new technology of fine screening and grinding again makes the concentrate grade improve to about 66% from 62%, thus realizing the requirement by the Ministry of Metallurgical Industry that the concentrate grade has to be improved to 65%.
Vipeak Heavy Industry Machinery provides customers perfect solutions of iron ore production line and ore beneficiaton.we are the professional mining equipments manufacturer in China.

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Also known as vertical roller mill grinding, medium grinding, since the invention has been half a century, with the materials science, development and design of hydraulic technology, the innovation process, so that the body's resistance to vertical grinding mill have been significantly improved and enhanced, more advanced and reliable hydraulic system. Roller roller and disc structure lining the continuous improvement of disc rotation speed corresponding to the grinding fineness of different products to further improve efficiency, so that the development and application of vertical mill to be further expanded.
In the modern cement industry's production system, including raw material grinding mill operations, cement grinding, grinding and preparation of coal slag. Cement grinding unit is generally believed that the power consumption of the consolidated materials, power consumption of 60% to 70%, therefore, improve efficiency, reduce power consumption has been grinding the cement industry grinding technology research priorities. LM Series Vertical roller mill (roller mill) is an energy efficient drying and grinding equipment, set crushing, drying, grinding, classifying, transportation as a whole, the use of limited vertical roller mill powder bed material grinding principle, with a grinding, high efficiency, low power consumption, drying capacity, easy to adjust the fineness of the product, the process is simple, small footprint, low noise, no dust pollution, low wear, easy maintenance and reliable operation .
Vertical mill gear from the main motor, coupling, reducer of three parts, mounted on the lower part of the mill, it is necessary to drive disc drive, but also bear the disc, material, weight and pressure roller device applied grind grinding pressure, the vertical mill is one of the most important parts.
In order to adapt to the user more goods of low quality coal grinding anthracite trend, HRM vertical coal mill increase to the main gear speed reduction ratio of measures to reduce the disc, while improving the roller and roller disc liner structure, the disc to form a stable material layer thereby increasing the grinding pressure roller, to improve grinding efficiency, reduce the possibility of vibration mill, producing a more stable and reliable.
Vertical roller mill is an important component of grinding, HRM vertical coal mill liner and the use of arc-shaped tire roller, roller symmetrical structure, to a certain extent can be worn upside down to use, extending its life. Roller bearing using the new mechanical seals, both to improve sealing reliability, but also because fans do not need to seal reduces the oxygen content of the mill, reducing the possibility of an explosion inside the mill.
General vertical mill roller bearings with grease lubrication, but because of the larger coal moisture, the ability to improve drying, grinding chamber gas temperature is as high as 100 degrees, could easily lead to improper operation roller bearing temperature is too high, causing grease Evaporation metamorphism affect bearing life. Thus, HRM has been adopted coal grinding roller mill vertical thin oil lubrication, cooling, greatly increasing the bearing life (generally more than 2.5 times increase).
Zhengzhou Vipeak Heavy Industry Machinery manufacturing vertical milling machine is widely used on the basis of advanced technology, combined with years of experience in a variety of mill production, design and development of advanced grinding equipment. Is a set of crushing, drying, grinding, milling grade transport industry in one of the ideal equipment. Can be widely used in cement, power, metallurgy, chemical industry, non-metallic mineral industries. For the massive, granular and powdery materials ground into powdered materials required.You can get more info:http://www.vipeakgrinder.com Stone Crusher Manufacturer:http://www.crushertrade.com/

The main advantages of ball mill:
Ball mill is crucial equipment for grinding after materials are crushed. It is an efficient tool for grinding various materials into powder. It is widely applied in cement industry, chemical industry, new building materials, fire resistant materials, fertilizer, porcelain and glass industry etc. It has two ways of grinding: dry process and wet process.

Advantages of vipeak ball mill:
1, Vipeak ball mill can adapt a variety of materials with continuous production,and the large production capacity can meet the needs of large-scale production.
2, The device of ball mill has reliable features with long and continuous operation.
3, The maintenance work of ball mill is simple and easy to operation.Ball Mill repair and maintenance are crucial for assuring manufacture efficiency.If not maintained properly,ball mill run-time will be reduced causing substantial economic losses.
4, Grinding ratio of ball mill is large,and it can reach more than 300,and it is easy to adjust the fineness of the products.
5, Ball mill is appropriate under different conditions of work.Ball mill can combine the dry grinding processes together at the same time.
6, It has a good sealing device to prevent dust

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Impact crusher product size distribution of the main factors affecting the size distribution of feed, spindle speed and feed rate. In the feed size distribution to determine the circumstances, the basic parameters are the major products with the spindle speed and feed rate of change, therefore, necessary to affect the product particle size distribution analysis of the factors to identify the most important influence factors, the actual production provide the basis for operational control.
Orthogonal experimental design in scientific research and actual production has practical value of an experimental design approach, typically used for multi-factor experimental conditions of study, based on the number of experimental factors and the level of each factor the number, select the appropriate orthogonal to arrange experiments, the use of mathematical statistics approach to data, you can easily find too many factors for the experimental index has a significant influence of the main factors to determine the optimal experimental factor level indicators. Therefore, this article first orthogonal experimental method to determine the impact of particle size distribution of the main factors in order to facilitate the practical operation of the control.http://www.grinderpro.com/Impact.html Crushing Stone Equipement:http://www.infostonecrusher.com

At current, with further penetration of the economic globalization process, the economy in China develops swiftly and violently, the urbanization process constantly speeds up, the infrastructure construction makes great breakthroughs and all kinds of project construction like highway, railway, water conservancy projects and low-income housing have been growing vigorously, which promote the further development of the economy, but at the same time, lead to shortage of all kinds of resources such as natural sand and stone aggregates. Under such condition, the mining machinery manufacturing industry welcomes new development opportunity and the development has been unusually hot.
Influenced by these two factors that the government increases the investment and construction of low-income housing and of the development tendency of low carbon and green world, large-sized and green mining machines has become the first choice for industrial development. Based on the present situation of mining machinery industry, the mining equipment industry in our country should further deepen the reform, actively adjust the industrial and product structure, transform the economic growth method, enhance independent innovation ability and move more quickly to the research of high-end mining equipment, ore beneficiation machines, crusher equipment and key spare parts and market expansion. On the other hand, the relative companies should further improve the product quality and strengthen the service awareness and improve the comprehensive competitiveness of the whole industry. The innovative ability of the products is the most important factor determining the position of the mining companies in the global competition, especially for the mining equipment industry, it needs innovation more and develops environmentally-friendly and energy-saving mining machinery equipment.
As the professional mining machinery manufacturer in China, Zhengzhou Vipeak thinks that if the mining machinery industry wants long time of development, it should keep up with the pace of time, actively adjust and optimize the industrial structure, not only continues to produce the traditional mining machinery industrial advantages, but strives to develop knowledge and technology intensive industry and high-tech industry in order to promote the upgrading of the mining machinery industry. Our company is able to manufacture all kinds of production line such as stone crushing production line equipment, mechanical-sand manufacturing production line machines, and industrial powder making production equipment. The stone crushing production line equipment adopts new type energy-saving crushers, accessory equipment and electricity control system and provides a complete set of configuration with high cost performance. The mechanical-sand manufacturing production line machines adopts new type sand maker with high efficiency and excellent product granularity. The industrial powder making equipment is equipped with traditional Raymond mill and at the same time with new improved powder grinding configuration and advanced micro powder grinder so that it is able to all kinds of and all levels of customer needs.
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Ball mill grinding operations in the importance of beneficiation, ore crushing grinding operation is a continuation of the process is divided before the election an important part of preparation work. Grinding operations not only for mineral industry, but also in construction, chemical and power industry sectors are also widely used. In addition to handling some of the sands outside of all the concentrator, almost all grinding operations. In the mineral industry, as useful for fine-grained ore minerals embedded in the fabric, the order to feel the pulse of rock removed from the ore, and to a variety of useful minerals separated from each other, must be finely ground ore to, and sometimes even wear to the following.
Grinding fineness and mineral indicators are closely related. To some extent, the recovery rate of useful minerals with grinding fineness decreases. Therefore, an appropriate reduction of ore grinding fineness of useful minerals can improve the recovery rate and production. Grinding power consumption of the total power consumption accounts for more than concentrator. Therefore, the grinding operation in the beneficiation process plays an important role. In clean coal technology, coal-water slurry for grinding operations, oil coal slurry, coal slurry pipe, pulverized coal combustion and utilization of coal associated minerals and so on. In heavy medium coal preparation plant, the grinding operation is used to prepare heavy-medium coal preparation used in increasing quality.

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