M4TS – Engineering
DIVISION SALVADOR (DSAL) CHILE
ENGINEERING AND PROCUREMENT SERVICES OF A MOLY DRYING PLANT FOR RAJO INCA PROJECT
RAJO INCA PROJECT
The Rajo Inca Project (PRI) is part of the portfolio of structural projects and is the main project of the CODELCO Division Salvador (DSAL).
The structural project consists of providing long-term operational continuity for the DSAL, by changing the mining method from underground to open pit, as well as expansion and replacement of equipment at the concentrator plant, hydrometallurgical plant and tailings deposit. This will allow extending its useful life in more than 30 years and increasing its productive capacity by 50%, both in copper concentrates and in copper cathodes
The mine-plant complex has been defined at a rate close to 37 KTPD for more than 30 years. For this, the CODELCO VP, has carried out several previous studies (with multiple consultants) and currently has awarded the development of the Detail Engineering, Ground Engineering, Procurement Management and Support to the Start-up of the PRI to JRI Ingeniería S.A., with the aim of carrying out a comprehensive design (mine / plant / infrastructure).
JRI / CODELCO DIVISIÓN SALVADOR
EL SALVADOR, TERCERA REGIÓN, CHILE
05/04/2020 – 12/03/2021
ENGINEERING AND PROCUREMENT SERVICES
1.1 TON/H OF MOLYBDENUM CONCENTRATE DRYING PLANT CAPACITY PROCESSING OF FROM 9% TO 5% HUMIDITY CONTENTE. THE SYSTEM INCLUDES FIRE FIGHTING SYSTEM AND 1.5 TONS BIG BAG FILLER SYSTEM.
MOLYBDENUM DRYING PLANT
The molybdenum drying plant is one of the many improvements to be carried out within the context of the Rajo Inca Project, which will allow to replace the old system for collecting molybdenum concentrate from the filter.
The Molybdenum Drying Plant is a complete engineering design developed by M4TS in accordance with the requirements of Codelco DSAL, in which the necessary equipment is specified to reduce excess moisture in the concentrate from 9% to 5%. In addition, this plant will have a big bag filling system for 1.5 tons.
The Rajo Inca Project is located in the El Salvador mining deposit, in the pre-mountain range of the Chilean Third Region , Chañaral Province, Diego de Almagro Commune. The city of El Salvador is located at 26 ° 16´ south latitude and 69 ° 36´ west longitude.
CODELCO Salvador Division, is approximately 2,400 meters above sea level (M.A.S.L.) and approximately 1,100 kilometers from Santiago. It is in this area where the “El Salvador” Camp, the “Mine Area” and the “Plant Area” are located.
This dryer consists of a chamber with several shafts that are oriented perpendicular to the material flow rate. Several 30” discs are welded to each shaft. These shafts are driven by a common motor via sprockets and chains.
Hot oil, heated by an electrical powered hot oil heater, is brought to the system and enters the shafts through dual flow rotary hot oil joints. As the hot oil travels through the shafts and discs, it heats them. This energy is then transferred to the material via conduction. The shafts and discs rotate at a fixed speed to mix the material and improve heat transfer. Material is moved through the dryer by the rotation of the shafts and the addition of wet material.
Small bars on the ends of the discs help to break up any clumps and ensure smooth material flow. Evaporated water is removed via an exhaust hood.
Dried material flows past a set of discs that are cooled with process water provided by an air-cooled water chiller.
Dried and cooled material flows over a discharge weir that ensures the proper level of material in the dryer. Discharged material flows out through a rotary airlock.
Multidisc Dryer – Ancillary Equipments
An air-cooled water chiller will be provided to supply cooling water for the cooling section of the dryer.
The chiller will come complete with compressor, coolant pump, condenser, evaporator, induced air flow fan, sight glass, filter-drier, liquid line solenoid valve, thermostatic expansion valve, cover panel, NEMA 4 control cabinet, and process pump.
The system will include an electrically powered hot oil heater system. A first fill of thermal fluid will be provided with the system. The system will be rated for 73 kW, 380V, 50 Hz, with a maximum temperature of 425 °F. The system will include two pumps each rated at 50 GPM (one for standby).
The system will come complete with one 95 kW NEMA 4 flanged electric heater, all necessary piping, isolation valves, strainers, 40 gallon expansion tank, sight gauge, connection for nitrogen (by others), and NEMA 4 local control center with PID control. The control system will include remote set point input and retransmission. The system will be mounted on a skid.
The system will include a skid mounted eductor venturi scrubber rated for 150 ACFM to process water vapor and any entrained particles.
The scrubber will come complete with scrubber body, spray nozzles, separator tank, flanged connections, recirculation pump with motor, float valve, pressure gauges, and flowmeter. MOC for water contact will be 316 stainless steel.
The eductor venturi scrubber uses a water spray to induce airflow so no exhaust fan is required for this design and low flow rate.
FEED AND DISCHARGE CHUTES
These equipment are designed by M4TS and are manufactured by local factory.
FEED AND DISCHARGE SCREW CONVEYORS
Both screw conveyors are designed and fabricated by SYNTRON MATERIAL HANDLING LLC, used for the transportation of molybdenum concentrate.
Designed and fabricated by RIBOCO SPA, this equipment is used to collect molybdenum concentrate that could be released from the bagging process.
BIG BAG FILLER
Designed by M4TS, which includes knife gate valve, weighing system and roller bed among others.
FIRE FIGHTING SYSTEM
Designed and supplied by EPCM SA, this system is used to protect the hot oil system.
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