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Sand Processing, Recycling, Case Studies













The portable washing set-up includes up to 14 transfer conveyors.
The portable washing set-up includes up to 14 transfer conveyors.

Portable, pop-up washing operation

A US-based road construction group has proven it is possible to extract and process natural sand and gravel close to road projects.

Considering the high costs of material transport, it’s a significant benefit when construction aggregates are readily available near large paving projects.

Apex Sand & Gravel meets that demand as it follows the paving action on the I-80 in Nebraska and Wyoming, in the USA’s Midwest region.

A young yet experienced portable washing operation, Apex is a start-up company owned and operated by industry veterans.

“We saw the uptick in construction projects on the I-80, and we wanted to supply major paving companies with high quality aggregate, efficiently mined, processed and stockpiled close to the paving jobsite,” Apex’s operations manager Tom Andersen said.

In Nebraska the I-80 follows the course of the Platte River and the Platte Valley, where the water table is high and sand and gravel deposits are prevalent. As construction began on the I-80 in the late 1950s, sand and gravel was often mined off the right of way, rather than being trucked to the jobsite from kilometres away. Today these mining excavations occur in interstate lakes and popular fishing spots located near exchanges or overpasses.

Certainly, the region’s geology is fortunate for portable washing operations such as Apex Sand & Gravel, which recently processed material on land leased in Lodgepole, Nebraska. This location is ground zero for a $USD38 million ($AUD52 million) I-80 removal and reconstruction project. During the 2016 season, Apex produced 200,000 tonnes of material at the site – half for the construction of the eastbound lanes and the other half left behind for the westbound construction in 2017. With that completed, Apex prepared for teardown and relocation to the next production site.

“Prior to the season at the Lodgepole site, we did some drilling in the area and found a nice deposit less than a mile from the paving job,” Andersen said.

He said his group began by excavating to create a pond for the wash water, as well as a stockpile of material to feed the plant. After the material is washed, the water is sent to the pond where the solids settle out. The water is recycled and pumped back into the plant.

The portable washing set-up at the site includes two fine material washers, 14 transfer conveyors and a telescoping radial stacker, all manufactured by Superior Industries, a multinational provider of a complete line of crushing, washing, screening and conveying equipment.

The Nebraska sand and gravel deposits are washed, classified and dewatered with one of two Superior fine material washers.
The Nebraska sand and gravel deposits are washed, classified and dewatered with one of two Superior fine material washers.

Portability, reliability

Andersen said the equipment was chosen for its portability and reliability. “Set-up and teardown is super-fast. We can fold up the conveyors and stack them on a flatbed truck in no time,” he said, adding it took only one shift for him and another worker to set up all the conveyors on-site.

“We needed many portable conveyors as we are processing our material on a limited footprint,” he said. “Washed material must be conveyed via the transfer conveyors to nearby property where it’s stockpiled and loaded onto trucks for a short, three-quarter-mile haul to the paving jobsite.”

The material is washed, classified and dewatered using two Superior fine material washers. Andersen likes the durability of the units.

“They just outlast anything else I’ve seen,” he said.

Importantly, Superior has safeguarded the outboard bearing on each unit by placing it outside and away from the water tank, to provide extra protection against potential water damage. The design also prevents the common problem of overgreasing the bearing.

Apex stockpiles its finished products with a Superior TeleStacker conveyor, which is engineered to eliminate material segregation by stockpiling materials in windrows, to ensure products meet specifications. It is equipped with an automation system that allows the stockpiling of larger volume piles on smaller footprints.

“Also, the belts track nice, and you don’t have to babysit it all day long,” Andersen said.

Among multiple axle configurations, Apex chose an FD axle configuration for its stacker, as it offers the most flexibility when moving from site to site.

“I’ve been around all sorts of stackers, and this one is the best rough terrain stacker,” Andersen said. “It goes where we need it to go.

“In our business, we need a unit that’s tough and husky. Previous stackers that I’ve operated would often get stuck, and we’d have to pull them out with a loader.”

According to Superior’s engineers, the TeleStacker conveyor is designed for maximum safety and stability.

Its patented FB undercarriage provides increased undercarriage support and greater rigid lateral stability. Andersen said one of the stacker’s biggest safety advantages is the guarding placed on the units.

“When a Superior conveyor is delivered to us, we don’t have to install any guarding because it’s already been done at the factory,” he said. “That’s a big thing in this industry as far as meeting MSHA [US Mine Safety and Health Administration] regulations, and it’s a big plus that once we unload this equipment, it’s safe and ready to go.”

Apex Sand & Gravel will soon tackle its third season and has seen growth from the start. In 2017-18 it operated an additional portable washing set-up on a Colorado site where material was processed for a section of the I-80 that runs very close to the Colorado border.

Ongoing success for Apex is likely, especially when focusing on the I-80 projects. After all, the Nebraska section alone is 732km, with 82 interchanges, 442 bridges on or over the roadway, and 25 rest areas. That’s a lot of potential for portable washing operations.

Superior Industries products are distributed in Australia by Rivergum Industries (east coast) and 888 Crushing & Screening Equipment (west coast).

Source: Superior Industries



















Tuesday, 26 March, 2019 11:33pm
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