Washing; Dewatering; Water, Sludge and Fines Treatment
Rocktec has considerable expertise in the separation of organic and inorganic solids from process water particularly in the quarry, mining and concrete industries. We have a range of highly engineered and simple cost effective solutions for the above applications that suit the required level of solids recovery and water clarification. The products have uncompromised design and construction principles, and provide reliability with long operating life and minimum maintenance requirements.
To provide even wider reaching solutions, Rocktec has entered into a collaboration agreement with. ERAL, Equipos y Procesos, S.A. Founded in 1979, ERAL is an internationally renowned company specialising in the treatment of minerals and sands. Its principal corporate purpose is to develop, manufacture and supply capital goods and services for the Quarrying, Mining, Construction, Public Works, Environmental and other industries.
ERAL provides technical solutions tailored to specific client requirements, thereby providing an ideal partner for Rocktec. ERAL is active in a wide range of activities, from simple technical issues up to the design, manufacture, assembly and commissioning of turnkey plants. Each line of business is conducted to a detailed quality protocol to verify and/or validate design, materials and processes in compliance with project requisites.
ERAL is committed to the ongoing improvement of all its activities, primarily with a view to providing the industry with innovative solutions and technology, technical quality and service reliability, while generating added value for its customers and corporate associates.
CLICK HERE TO DOWNLOAD ROCKTEC-ERAL BROCHURE
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FlowmaxThe Flowmax is a breakthrough in solids dewatering, commercially launched in 2009 after many years of extensive and exhaustive field trials and development by our sister company, Aquaclear Technology Ltd. The Flowmax is a new and innovative type of vacuum belt filter, incorporating many unique and patented design features. The Flowmax was developed in response to a need for high flow rate equipment that could quickly dewater large volumes of sludge, sand and fibrous materials to the point that the solids are in a manageable state and the filtrate clean enough to be reused or discharged. CLICK HERE TO GO TO THE FLOW MAX – AQUACLEAR TECHNOLOGY WEBSITE |
Jadair Water Settler/ClarifierThe Jadair Clarifier, manufactured under license by Rocktec New Zealand, is an intelligently designed, compact solution for industrial water clarification. The Jadair concept utilises polymer flocculation and a computer controlled in-vessel system to guarantee clean, re-usable water and compact, de-watered solids. In operation, water and solids are separated by gravity sedimentation, enhanced by a proprietary polymer flocculation method, and suspended solids settle on the floor of the tank, from where they can be automatically (by computer control) scooped or scraped from within by special conveyor paddles. The Jadair can handle solids from about 0.3mm to 200 micron silt or clay (sizes above this will settle without the use of flocculants) and the solids themselves are so dry that they can be handled by a loader or hauled away in trucks. These resultant solids have a variety of uses, including landfill refuse cover, landscape contouring, brick manufacture and soil mixes. The Jadair has a number of advantages over traditional settling ponds, and is available in capacities from 150 – 900m³, based on normal solid loading of 8-15 per cent by volume. The system is also completely modular so additional systems can be installed alongside existing units to increase capacity. One Jadair master system can run up to three adjacent units without the need to replicate controls and hydraulic power sources. Typically, the solids produced by the Jadair are in spreadable form with a moisture content around the 28-35% mark, a vast improvement over the wet slurry produced by older-style gravity settlers. Being a true closed-loop system, it is environmentally sound, meeting all requirements set by local councils and government bodies, and the design ensures that water consumption is minimal and reclamation high. Water clarity is high enough to allow for mining process reuse. Traditional settling ponds take up a large amount of land that could be used more productively. The Jadair compact design ensures that available land is used to best advantage. CONTACT ROCKTEC FOR MORE INFORMATION ON THE JADAIR RANGE |
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Warrior Wheel and Underbody Truck WashThe Rocktec Warrior Wheel and Underbody Truck Wash has been designed to provide a convenient, efficient and fully automatic drive through wash for heavy vehicles. The Warrior caters for all types of road legal vehicles and is built entirely of steel to ensure long life in the most arduous conditions. The design of the wheel wash prevents the vehicle wheels from wearing the mainframe by raising removable grates above the frame. This also gives the benefit of a continuous rumble effect, helping to loosen dirt and shake off excess water. The base of the Warrior is hot dipped galvanized to prevent any corrosion from either the environment or the water that is used. Solid, removable grates allow easy access for any cleaning or maintenance that may be required, whilst a central walkway gives safe personnel access over the wheel wash. As the truck approaches the Warrior a sensor (specifically designed to eliminate nuisance tripping from external sources) activates the wash cycle. A horizontal end suction centrifugal pump is supplied to provide the necessary water to the 84 high pressure nozzles that are carefully directed to clean the underbody, the inside and outside of the wheels, as well as the tread and between the wheels. |
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ERAL Washing Drum (Scrubbers)ERAL Washing Drums are suitable for intense washing of coarse materials of up to almost 400mm in the larger models. They are cylindrical drums, mounted on pneumatic tyres, equipped with a series of internal rubber lifters that lift and turn the wet or dry raw material, which is fed into one end of the drums (ERAL drums can be run uniflow or contraflow, depending upon the required intensity of washing) for pre-washing and pulping to obtain a homogenized mixture. The lifters raise and drop the aggregate in a cascading motion and move it forward while inside the drum. The friction generated between the feed material, the drum wall and the internal mechanisms produce a self-grinding effect, the washing or breakdown effect being directly related to the retention time. There are 11 models of ERAL washing drums, with capacities up to 1,000MTPH, depending on the duty. |
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ERAL Log WasherLog Washers are used to liberate hard plastic clay, friable soil and soft materials from coarse aggregates and rocks not exceeding 75/100mm size. The main feature of the log washer is the twin counter-rotating shafts fitted with replaceable abrasion resistant paddles to handle the toughest duties. CONTACT ROCKTEC FOR MORE INFORMATION ON ERAL LOG WASHERS |
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ERAL Dewatering ScreenDewatering Screens are high frequency screens with the deck inclined upwards, between 5°and 8° towards the discharge end. They are used for sand dewatering, to reduce the moisture content of sands to between 10-15% and to filter out very fine particles and silt. The removal of contaminants, such as silt, yields excellent concrete sands, with the added advantage of eliminating the cost of transporting water, and any water leakage onto roads. |
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ERAL Compact Hydrocyclone PlantERAL Compact Hydrocyclone Plants are designed for efficient and low cost washing and classifying of sand. Each plant consists of a single, compact module containing a pumping unit, a hydrocyclone and a dewatering screen. These are sized to suit the conditions required for each application, mainly in sand washing and recovery of fine sands, production of special sands, bentonite regeneration, thickening of feed slurries with solids in suspension or partial clarification of effluents. Their compact and effective design ensures significant user benefits, such as speedy assembly, ease of operation, low maintenance and a reduced footprint. CLICK HERE TO DOWNLOAD ERAL COMPACT HYDROCYCLONE PLANTS BROCHURE |
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ERAL HydrocycloneERAL manufactures a wide range of hydrocyclones, either in self-supporting construction of polyurethane or polymers or in a mild steel shell construction with easily replaceable liners in different types of natural rubber to suit the specific application. The modular design enables the exchange of parts between different types and sizes of hydrocyclones, providing quick and easy replacement and versatility of operation. By adopting this approach, ERAL can deliver a suitable hydrocyclone for all operating conditions and classification requirements. These units are designed for the industrial processing of sand, minerals and other sundry materials - for sand washing and the recovery of fine sands, for the classification of solids between 10 and 300µ, slurry thickening, the partial clarification of effluents and washing circuits and, in the food, chemical and energy industries, for a variety of solid/liquid separation processes |
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ERAL Sieve BendSieve Bends can be either static or high frequency vibration types, specially designed to achieve fine classifications between 0.25-2 mm. Main applications are silica sand and concrete sands, industrial minerals sizing and pre-dewatering equipment in miscellaneous applications CONTACT ROCKTEC FOR MORE INFORMATION ON ERAL SIEVE BENDS |
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ERAL HydroclassifierThere are two types available from ERAL. The single-cell equipment is used for the up-stream classifying of materials in the range 0.2-2mm, in which sand particles follow a vertical flow. The multi-cell equipment is used to obtain several particle size materials, which settle following a parabolic flow. CONTACT ROCKTEC FOR MORE INFORMATION ON ERAL HYDROCLASSIFIERS |
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ERAL Thickeners/Clarifier (Hi-Rate)The Hi-RateThickeners/Clarifiers are highly effective in separating solids & liquids at very high rates, and the treatment of waste water produced in the washing process of sands and minerals. The sludge, clay and fine particles are accumulated in the bottom of the unit, as a slurry, to the point of discharge, whilst the clarified effluent flows continuously through a peripheral launder located in the top of the tank. The process is particularly well suited to treating the effluents, runoff and waste water generated by the aggregate, mining, construction, chemical and environmental industries. The optimal results delivered by ERAL’s high performance Hi-Rate Clarifiers/Thickeners, are at rates from three to twenty times greater than in conventional tanks, to provide better clarification conditions, higher concentration of solids during discharge, efficient and automatic process control and lower investment costs. We can draw from ERAL’s extensive material resources to conduct any laboratory or pilot plant testing to ensure the proper sizing of all equipment, as well as the choice of optimal flocculation equipment and the appropriate type of flocculent. The principle of operation of the Tespa Thickeners is similar to the Hi-Rate Thickeners. This equipment has been specially designed for the processing of plastic clay, whereby it makes possible to obtain in one stage clarified water and a high density sludge with water content similar to a cake produced in process filtration |
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ERAL Automatic Filter PresseWhen thickened sludge needs to be filtered for subsequent handling as a solid, or for reasons of environmental control, ERAL has a range of automatic filter presses and can design the complete processing facilities for comprehensive effluent treatment, based on a thorough study of user requirements and the characteristics of the material. The automatic filter presses are used for the sludge dewatering generated in the sand and minerals washing treatment, as well as other industrial processes. The sludge from the thickener underflow is subject to a solid/liquid separation process at high pressure to obtain a cake with low moisture content, and to reclaim the wastewater CONTACT ROCKTEC FOR MORE INFORMATION ON ERAL FILTER PRESSES |
