The Prachuap Khiri Khan region of Thailand is well known for producing high quality aggregates, with 4 quarries and 6 concrete plants in operation. Tabsakae Granite Co. Ltd operates a quarry and a concrete plant in the Prachuap Khiri Khan region of Thailand. The quarry aims to produce 50 000 tons of aggregate each month, with around 40 trucks carting the aggregates away every day. The company has permission to operate at the 130 rai (1 rai = 1600 m2) location for 10 years. 60 % of the aggregate production is sold to other companies, with 40 % being used by the company’s own concrete plant. This is situated approximately 40 km to the south of Prachuap Khiri Khan, and 40 km away from the quarry, delivering concrete it’s within a 100 km radius. Another production line produces granite aggregate for use in dam protection in several regions of Thailand.
Aggregates for Southeast Asia
Tabsakae Granite Co. Ltd. Has operated a complete mobile crushing and screening plant (Fig.) since March 2015. The Sandvik Construction QJ341 jaw crusher, QH331 Hydrocone crusher and a QA451 triple deck Doublescreen are now delivering impressive production of high quality aggregates. “Our clients come from Singapore, Bangladesh and Brunei because they prefer the high quality of our aggregates”, explains Isun Atpaset, owner of the Tabsakae Granite Co. Ltd. The aggregate is also supplied throughout Thailand, with one interesting application being the planned lower east-west railway corridor which is financed in cooperation with Japan. The railway line connects the planned Dawei Project in Myanmar (a deep sea port which is built to open up a new transport link between Southeast Asia and southern China) with ports in Vietnam and with China.
“With such a wide variety of customers, from an extensive geographic spread, Isun Atpaset needed a modern crushing and screening plant that was flexible, productive, and able to produce the accurately sized aggregates his customers require. Mobile crushers and screens from Sandvik give me the maximum possibilities for conducting my business”, explained Isun. The plant he settled on enables him to change the production site within a very short time. “The flexibility and the high production rates were very impressive arguments,” he continues. Furthermore the plant has lowered the cost per ton of produced aggregate which is boosting the profitability of the quarry.
The crushers and screens are used processing ballast from 63-25 mm, and concrete aggregates in fractions of 25-10 mm, and 10-0 mm. Cost effective production is ensured with the combined plant having low fuel consumption of around 100 l/h. The plant currently works in closed circuit, in a ‘star formation’ designed to maximise the efficient production of the aggregates (Fig.).
Crushing and Screening Capacity
A mobile jaw crusher is at the start of the plant, with the QJ341 used at the quarry designed to operate in a variety of different conditions. Designed to be able to work in rugged conditions, and being ideal for dealing with quarried materials, the single toggle jaw crusher weighs 48.2 t and has a 1200 x 750 mm wide jaw opening. To maximize output the jaw setting is hydraulically adjustable, and may be reversed in order to relieve blockages. Downtime of the crusher is minimal as the crusher may be started ‘under load’ with the hydraulic drive.
“Also the QH331 Hydrocone crusher satisfies all my demands on the production of high quality aggregates,” says Isun of his choice of cone crusher. At the heart of the QH331 is the CH430 cone. This is equipped with a hydroset system which facilitates several adjustment functions. The automatic setting regulation system optimises production, as well as minimizing interruptions and downtime by controlling the liner wear.
The QA451 Doublescreen also enables an increase in throughput, control and screening efficiency due to the two inline independent screenboxes, each 3 x 1.5 m, a large hopper and extended conveyor belts. When used in conjunction with the tracked crushers, the QA451 is able to work in closed circuit operation. If in future an extension to the plant is needed, a fourth unit may be easily added. Facilitating enhanced production, the feeding position to this fourth upstream unit can be optimized by slewing, raising or lowering the fourth conveyor hydraulically.