Rock Products

JUL 2018

Rock Products is the aggregates industry's leading source for market analysis and technology solutions, delivering critical content focusing on aggregates-processing equipment; operational efficiencies; management best practices; comprehensive market

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24 • ROCK products • July 2018 Conveying strength and reliability, and are avail- able in a variety of lengths and belt sizes. "With more than 30 years of experience in stacker production, we've introduced features that con- tinue through the line today including a patented counter weight design and heavy-duty frame," the company said. Easy-to-setup and easy to use, the stackers feature hydraulic main lift and top fold. Sandvik Sandvik's new addition to its scalper range is the Sandvik QE441 Free Flow, a versatile and highly efficient solution for processing difficult-to-screen mate- rials and products with high moisture contents. The Sandvik QE441 Free Flow provides a mobile solution for handling sticky, moist and wet materials with a high percentage of fines. It is your ideal solu- tion for processing materials such as soils, aggregates, ores, waste, biomass and other waste derived fuels including products with high moisture contents. "We have designed this unit based on the sturdy crusher-style chassis of our class leading Sandvik QE441, combined with a highly productive and aggres- sive double deck Free Flow screen," the company said. "The heavy duty scalp- ing screen allows you to process large un-screened material on the rigid scalp- ing top deck, whilst providing a fine screening solution on the dual motion lower deck. The powerful snapping of the bottom deck media generates an active 'flip-flow' movement which generates a huge throw that propels material upwards and outwards sepa- rating material as it does so and thereby eliminates any plugging and blockages. This results in the processing of more sellable products and less waste." Sandvik QE441 Free Flow has been designed with the same user-friendly features of the 1-Series screens. These include Sandvik's easy to use control system and user interface with sequen- tial start, whilst two speed tracking will help to reduce travel time between job- sites. Sandvik QE441 Free Flow offers increased plant durability and oper- ator comfort, without sacrificing on performance. With a large choice of screen media and a wide range of adjustable throws and speeds available, this enables the Sandvik QE441 Free Flow to be config- ured to suit the specific requirements of the application. It complements the company's Premium jaw crushers and QI341 Prisec impact crusher, and can also work as a stand-alone unit. Key features of the Sandvik QE441 Free Flow are: • Heavy-duty modular top-deck scalp- ing screen allows you to process large un-screened material, whilst a dual motion Free Flow screen sepa- rates fines and sticky material on the bottom deck. •  Aggressive Free Flow screen with wide range of adjustable throws and speeds enables the bottom deck to be tailored for numerous applications. •  Highly efficient and easy-to-use electrical control system with col- or-coded numerical push buttons for ease of operation. •  Heavy duty crusher-type chas- sis designed to accommodate interchangeable side conveyors and compatible for two-way or three-way split configurations. •  Modular design screen box for easy replacement of screen media. •  Feeder load sensing facility to pre- vent blockages and unnecessary downtime. •  Capable of operating in the most hos- tile environments. •  Massive stockpiling capabil- ity through integrated hydraulic conveyors. •  Spacious and easily accessible hydraulically folding maintenance platforms. Companies governed by OSHA are now required to follow rules of compliance by using a personal dust monitor worn by a trained employee to monitor the amount of respirable crystalline silica (RCS) and determine whether the exposure is under the average "action level" of 25 µg/m3 (micrograms of RCS per cubic meter of air). MSHA could follow suit in the future. Plants must protect workers if they have an amount of RCS dust above the PEL of 50 µg/m 3 , averaged over an eight-hour day. To control these levels, OSHA provides guidelines regarding methods of compliance, advising com- panies to: • Use engineering controls – These include isolating dust in sealed chute systems and dust collectors, and/ or using water-based atomized suppression systems. • Provide respirators – Compliance cannot be achieved by respirators alone, but respirators must be provided for use in areas where engineering controls cannot adequately limit exposure. • Limit worker access to high exposure areas – Limit access to areas where workers could be exposed to dust concentrations above the PEL. • Develop a written exposure control plan – Have it avail- able along with monitoring results. • Offer medical exams to highly exposed workers – Review the regulation for compliance details. • Train workers on silica risks and how to limit exposures – Workers should be able to identify to OSHA inspec- tors, the dust control supervisor and the compliance details when asked. Source: Martin Engineering and BossTek. Respirable Crystalline Silica

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