Aggregates

Crushed stone, sand and gravel products make up the construction aggregates industry and lay the groundwork for many infrastructure projects that are essential to our way of life. McLanahan designs and manufactures equipment that can be used in all steps of the production of construction aggregates, from crushing the material to the desired size and sorting the various sizes for specific uses, to maximising fines recovery and eliminating settling ponds.

Construction aggregates are produced from naturally occurring mineral deposits, including solid rock formations such as limestone and granite, and from loose deposits of sand and gravel. The most common structural uses of construction aggregates include the coarse and fine mineral components in Portland cement concrete and asphalt. Aggregates are used for road base and gravel roadways, as well as produced for use in everyday materials, such as paint, light bulbs and white appliances. Construction aggregates are also produced as byproducts from other manufacturing processes such as steel mill slag. 

Crushing

McLanahan offers a variety of crushing solutions to help aggregate producers better control the size and shape of their product. The company offers a wide range of primary, secondary and tertiary crushers for reducing and refining aggregate material through compression, impact, and attrition or shear forces. McLanahan’s in-house laboratory offers material testing to provide you with a machine that will fit your crushing requirements. 

Types of Aggregate Crushers

Feeding

McLanahan Feeders deliver aggregate material to both the initial and downstream processes by means of moving apron pans, vibration, reciprocating plates or rollers. The Feeders are designed specifically for the application’s material size, weight and desired throughput, and then programmed to feed the aggregate at a set rate to match the capacity of a conveyor belt or crusher. Some are designed with the means to scalp the feed to filter out the undersized product.

Types of Aggregate Feeders

Screening/Sizing

Screens are used to separate a flow of aggregate material according to its size. This is accomplished by giving the material plenty of opportunities to pass through the screening media and allowing particles that adhere to each other to dislodge in the process. McLanahan offers both stationary and portable screening equipment designed to segregate material, reduce fines generation, remove refuse material and minimise crusher size.

Types of Aggregate Screens

Washing & Classifying

McLanahan’s extensive line of washing and classifying equipment helps aggregate producers meet specifications by removing excess water and rejecting deleterious material. The company’s equipment also allows for sizing, separating and dewatering. Aggregate producers need only tell McLanahan’s experienced sales and process engineering teams their feed gradation and desired size, and McLanahan will provide them with a complete system model as well as product yield and waste predictions. Because requirements vary from site to site, McLanahan’s extensive range of equipment ensures that each customer has the best solution for their washing and classifying application and will get the highest ROI from their equipment purchase.

Types of Aggregate Washing & Classifying Equipment

Scrubbing

For removing stubborn clays and other deleterious material from coarse aggregate and gravel, McLanahan offers a number of scrubbing solutions. Attrition Cells, Blade Mills, Coarse Material Screw Washers, Log Washers and Rotary Scrubbers can be used to break down and remove clay, coatings, dust, vegetation and more from a coarse aggregate feed to produce a clean, sound aggregate product.

Types of Aggregate Scrubbing Equipment

Dewatering

McLanahan offers one of the largest selections of dewatering equipment in the industry, including Dewatering Screens, Filter Presses, Fine Material Screw Washers, Hydrocyclones and Separators, and Thickeners/Clarifiers, to remove moisture from end products. McLanahan dewatering equipment produces a drier, drip-free end product. It also helps producers create a sustainable environment and helps plants with permitting and regulatory issues by reducing and/or eliminating settling or tailings ponds.

Types of Aggregate Dewatering Equipment

Sampling

Certain applications in the aggregates industry can require very tight tolerances when it comes to sampling accuracy and precision. McLanahan can provide aggregates producers with a large range of sampling solutions to monitor the quality of their product. McLanahan Mechanical Sampling Systems are designed to extract samples from a moving belt, offering a safer collection method and an accurate way of monitoring product quality.

Types of Aggregate Sampling Equipment

Mixing/Blending

Mixing/blending is the process of combining various material to create a new, uniform product. When combined, these materials create a new, uniform product. McLanahan’s line of Pug Mill Mixers/Road Base Mixers are designed for use in many industries and for many applications, including blending road base materials.

Fines Recovery

McLanahan offers a number of solutions when it comes to fines recovery. This equipment allows aggregate producers to comply with permitting and environmental regulations, reduce pond maintenance costs and extend pond life. In some cases, the need for tailings/settling ponds can be reduced or eliminated, which frees up time and land resources. Aggregate producers who recover fines may also discover a potential saleable product.

Types of Aggregate Fines Recovery Equipment

Tailings & Water Management

Most wet processing facilities have some sort of water management system in place in order to meet environmental regulations. McLanahan offers water management solutions that can help aggregate producers reclaim process water for reuse, as well as reduce or eliminate tailings or settling ponds by getting the solids into a state where they can be easily handled and transported.

Types of Aggregate Tailings Management Equipment

Why McLanahan

In the mining business since 1835, McLanahan employs a team of process design experts who are able to help you create a more efficient, more productive and more profitable site. McLanahan ensures your aggregate product conforms to the specific sizes needed to meet demanding specifications, as well as ensures your application is satisfying water usage permits. Let McLanahan's crushing, feeding, screening/sizing, washing and classifying, dewatering, sampling, mixing/blending, fines recovery and tailings management solutions help you produce your desired aggregate material.

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