vertical roller mill in argentina

vertical roller mill development history

vertical roller mill development history

In cement production, vertical grinding mill shows its remarkable advantages and features, which is why vertical grinding mill draw more and more attentions of investors in the world. vertical mill integrates crushing, grinding, drying, classifying, elevator into one set, not only space saving but also reduce the investment cost. Here, we mainly introduce development history of vertical grinding mill.

Vertical roller mill is also called vertical grinding mill, roller mill and vertical roller mill. The first vertical mill was invented in the 1920s in Germany while the first vertical mill used for cement production appeared in 1935 in Germany. After many years application in the European cement factory, vertical mill started to get adopted in the USA and Canada. At that time, vertical mill got popular in Europe, USA and Canada was because the fuel cost and electricity expense was relatively high. It was exactly because of its high electricity expense, the USA paid more attention to vertical mill.

The first vertical mill put into operation in the USA was in the year 1973. Later, Japan, Egypt, Mexico, New Zealand, Argentina, Congo and some other countries all adopted vertical mill. At the end of last century, the economy of Southeast Asia developed rapidly, which also brought the remarkable growth of cement market. Many international companies started to invest in Southeast Asia, leading to the appearance of many large scaled cement production plants. At the same time, vertical mill got wide application in Southeast Asia area.

The technology breakthrough of vertical mill started from the 1960s. From then, vertical mill got optimized and upsizing. After being used for grinding raw material in cement industry in Europe, America and Asia, vertical mill got rapid development in the 1970s. Large scaled vertical mill with capacity 500t/h even appeared at that time. Entering the 1990s, new breakthrough appeared for the international vertical milling technology. It optimized the structure and producing process, ensuring the application of extra-large scaled vertical mill.

The application of vertical mill in China first started at the end of 1940s, using for raw material grinding in while cement factory. Since 1950s, some small cement factories started to adopt small scaled vertical mill to grind raw material, some even use vertical mill to grind coal in wet cement factory. Later, manufacturers kept on researching and optimizing vertical mill.

Throughout the application and development of vertical mill in China and abroad, vertical mill is developing into large and extra-large scale, in order to meet the requirements of dry and went cement production line.

vertical roller mills

vertical roller mills

With the many advantages vertical roller mills offer, we continually develop our VRM offering with the latest upgrades, including the OKTM Mill and the ATOX Coal Mill. The OKTM Mill skilfully comminutes raw material, cement and slag. It features a patented roller and table design and concrete mill stands instead of traditional, heavy steel structures.

The OKTM Mills flexible design makes it possible to operate it with a number of rollers out of service while still reaching 60 to 70 percent of the normal operation output, minimising production losses.

The compact and long-lasting ATOX Coal Mill has the capability to grind virtually all types of raw coal, to your desired fineness. It is suitable for feed materials with varying moisture percentages, handling abrasive and sticky raw coal with ease.

The cement industrys focus on energy reduction has made vertical roller mills particularly compelling. Grinding systems in cement production make up approximately 85 to 90 percent of total plant electrical energy consumption. As vertical roller mills are 30 to 50 percent more efficient than other grinding solutions, they give cement plant owners a great opportunity to

When it comes to grinding raw coal, savings in specific energy consumption can be achieved with vertical roller mills. Specific energy consumption depends on the grindability of the raw coal and the coal meal fineness required. A dynamic separator that ensures high separation efficiency also helps to reduce specific energy use.

FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.

review on vertical roller mill in cement industry & its performance parameters - sciencedirect

review on vertical roller mill in cement industry & its performance parameters - sciencedirect

India is the world's second largest producer of cement and produces more than 8 per cent of global capacity. Due to the rapidly growing demand in various sectors such as defense, housing, commercial and industrial construction, government initiative such as smart cities & PMAY, cement production in India is expected to touch 550600 million tones per annum (MTPA) by the end of year 2025.

With recent growth and success journey there is also a threat approaching to cement industry that its input cost is increasing. Power cost, fuel cost, raw material cost have doubled up in recent years whereas cement price has not hiked in that fashion. Also 40% of the cement production costs are energy costs out of which more than 60% of the total electricity is used in grinding circuits. In order to survive and sustain in the market they need to increase their profitability which can only be achieved by increasing productivity and reducing power consumption. High productivity and low power costs can be achieved by increasing output, lowering breakdowns and optimizing the energy consuming grinding process.

The objective of the study, is to draw attention to the need of Cement grinding process optimization to minimize power consumption and achieve higher productivity. In the study the advantages of vertical roller mill are discussed over ball mills. VRM construction, its process and parameters which affects the performance and productivity of vertical roller mill are discussed. Also the consequences of variations in parameter explained. With proper optimization of these parameters, the productivity of vertical roller mill can be improved and performance stability can be achieved by addressing root causes.. This study can benefit the organizations using VRM and are not able to utilize its full productivity due to some bottlenecks or constraints.

vertical roller mills: the new leader in grinding technology

vertical roller mills: the new leader in grinding technology

Historically the reefs were rich and large profits were made with ordinary recovery circuits but today mines are dealing with complicated ores that require fine grinding to allow a 92% 98% recovery rate just to stay in the game.

Being well established in the cement industry with a 55% market share worldwide, the company has taken the proven design concepts and adapted it to the ore industry, specifically gold, copper, phosphates and iron. To support the equipment, Loesche has a team of highly qualified staff dedicated to ensuring customer service and satisfaction is achieved.

The particle size is critical for a sufficient degree of mineral liberation to expose the mineral and the grindability of the ores fluctuate, hence the beneficiation process and especially the comminution process must be flexible.

Dry and wet grinding technologies were compared in terms of grinding performance and product quality. Through significant laboratory work done, improved flotation performances of dry ground products have led to the design of a completely new beneficiation process.

The Loesche VRM has adaptable grinding modules which are already proven to be the way forward in other mining industries, allowing for variant mineral ores to be milled efficiently to the required particle size.

The VRM, depending on the roller size, has a high reduction ratio; feed from 80 mm to 140 mm to a product of P80 at 75 m in one pass, the mill is a closed circuit on its own having the comminution and classification of product in a single machine.

Sulphide copper-gold ores are usually sorted by flotation. The standard comminution process to grind the ore to flotation fineness, mostly consists of coarse crushing followed by SAG milling or wet ball mill circuits, or alternatively multiple stage crushing followed by rod and ball milling.

The two most common compressive comminution technologies are the high pressure grinding roller (HPGR) and the vertical-roller-mill (VRM). For now, the HPGR has already presented in a noteworthy number of mining projects whereas VRM technology, a new entrant, is still not fully accepted.

This is considered a resistance to change considering that VRM technology has a clearly dominant position in classical dry, compressive comminution applications like grinding of cement or granulated blast-furnace slag.

The VRM produces a steeper particle size distribution, reducing wastage in the form of ultra-fines and oversize, by this the VRM allows for a good flotation size range having more particles exposed to the floatation process.

Loesche VRM comminution technology is a particle on particle in bed grinding principle, cracking the ore on the mineral lines to expose more minerals to the floatation process with very low specific wear on the liners to produce cleaner concentrates.

Dry product allows for a surge silo to operate between the comminution and recovery circuits which ensures accurate, constant feed. This consistent flow with cleaner concentrates reduces reagent consumption.

By this a smaller footprint can be envisaged, reducing water absorption and evaporation. Increased water reclamation and less pollutants will be experienced affecting the nett operating expenditure to process a ton of ore.

Challenges from the strict environmental regulations have allowed Loesche VRM technology to become the future in comminution, enabling mining houses to operate in previously difficult conditions not suited to wet processes.

The OGP is a modular containerised comminution circuit laboratory where a Loesche milling specialist will be on hand performing various grinding tests until the optimum solution is reached for downstream processes.

vertical roller mill services

vertical roller mill services

Maintenance and repair of a VRM is highly technical, and it should only be performed by experts. You might be concerned about correct parts installation, or about the need for strict pressure sealing of the hydraulic system, or about getting mill equipment refurbished in the shortest possible time, so that your plant can stay competitive.

You can optimise mill performance and identify issues that can cause costly failures or breakdowns with periodic mill inspections. We provide customised inspections and ongoing expert technical support to keep your mill working smoothly and prevent any potential issues.

Avoiding any mill downtime is essential, so you need your equipment to be refurbished in the shortest possible timeframe. You can save time with our on-site high-precision machining and grinding services and be confident that we will ensure all the correct tolerances and correct installation.

FLSmidth provides sustainable productivity to the global mining and cement industries. We deliver market-leading engineering, equipment and service solutions that enable our customers to improve performance, drive down costs and reduce environmental impact. Our operations span the globe and we are close to 10,200 employees, present in more than 60 countries. In 2020, FLSmidth generated revenue of DKK 16.4 billion. MissionZero is our sustainability ambition towards zero emissions in mining and cement by 2030.

operation guide for vertical roller mill in cement plant | agico cement

operation guide for vertical roller mill in cement plant | agico cement

The vertical roller mill (VRM) is a type of grinding machine for raw material processing and cement grinding in the cement manufacturing process. In recent years, the VRM cement mill has been equipped in more and more cement plants around the world because of its features like high energy efficiency, low pollutant generation, small floor area, etc.

The VRM cement mill has a more complex structure than other types of cement mills, so we need to ensure the following aspects are normal during the operation, or the machine may not be able to function well.

Too thick material layer will reduce the grinding efficiency of the vertical roller mill. When the pressure difference of the mill reaches the limit, the material layer will collapse and affect the operation of the main motor and the discharge system.

There are many factors that may make mill body vibrate, including the grinding pressure, material layer thickness, air volume and temperature, accumulator pressure, wear condition of the roller and the grinding plate, etc.

The grinding pressure of the mill should be adjusted according to the fed quantity, the particle size, and the grindability of the material. It must be well controlled to maintain the thickness of the material layer, reduce the vibration of the mill body, and ensure that the stable operation of the mill.

Increasing the grinding pressure will improve the grinding capacity of the mill, but the grinding capacity will stop increasing when the grinding pressure reaches a certain critical point. If the set pressure of the hydraulic cylinder is too high, it will only increase the driving force and accelerate the wear of parts, but not improve the grinding capacity.

On the other hand, too high grinding pressure will cause the thickness of the material layer to decrease, which further leads to the increase of the vibrating speed of the mill and accelerates the wear speed of the parts.

The gas temperature at the discharging port can be increased by increasing the opening of the hot air door and reducing the opening of the circulating air door. However, when the gas temperature exceeds 130 , the equipment will also be damaged. For example, the dividing wheel at the lower part of the cyclone will expand and get stuck, and the lubricating grease of the grinding roller will dry and crack, which is also unfavorable to the tail dust collection bag.

In vertical roller mills, the air volume in the mill is determined by the material feed rate. The air volume can be controlled by adjusting the power of the circulating fan of the mill or the opening of the exhaust fan at the kiln tail.

If the air volume is too large, the pressure difference in the mill and the current of the main motor will decrease, the thickness of the material layer will become thin, and the vibration degree of the mill body will become strong.

If the air volume of the system is too small, the thickness of the material layer, the pressure difference in the mill, and the current of the main motor will increase, and so will the vibration speed of the mill.

When operating the vertical roller mill, the operator must control the inlet and outlet air valves to make the air volume of the system in a balanced state, so as not to affect the air pressure at the back end of the rotary kiln.

Related Equipments