Increase of 20% in productivity
The Minermix crushing plant in Capivari is fed with basalt mined from a site located approximately one kilometer from the facility. The primary crushing phase includes a Metso Nordberg® C125™ jaw crusher, followed by secondary crushing with a Nordberg® HP400™ cone crusher. All the material requiring further processing is crushed in two parallel tertiary crushing stages. Until January 2016, this job was performed by two HP4s that had been installed since the beginning of the quarry’s operation in 2010. Today, one Metso MX4™ Multi-Action cone crusher works alongside the original HP4. Number 4 stands for the power rating that is 400 horsepower.
According to Minermix Mineração Supervisor José Nilson, Metso’s MX4 cone crusher was installed with the complete support of Metso (including training of the operator), and, since its start-up, has demonstrated an increase of 20% in the productivity. In José Nilson’s assessment, the gain in productivity may be as high as 30% with supplementary adjustments.
The supervisor credits this improvement mainly to the fact that the equipment enables adjustments while operating at full load capacity or, in other words, without the need to shut down the equipment, and its use at maximum power. “The equipment reaches 95% and, when it reaches peak production, the equipment itself makes the adjustments to balance production,” Nilson says. The stability of production has also enabled a 5-10% reduction in the production of rock dust, an unwanted byproduct in the production of manufactured sand used by concrete plants. “It may not seem like much, but the reduction has a notable bearing and impact on daily production,” explains José Nilson.
More uptime with the patented Multi-Action technology
MX4 is based on the patented Multi-Action crushing technology that combines the piston and rotating bowl into a single crusher. The way it has been designed, the crusher provides the maximum utilization of the wear parts leading to extended maintenance intervals.
The MX4 works throughout the day, self-adjusting the crusher opening/setting or power to our specifications,” José Nilson adds. This kind of underload dynamic adjustment means more uptime, as it is carried out while crushing. An audible alarm informs the operator that the temperature and pressure conditions, the oil level, etc., are in conformity with previously established parameters.
Nilson notes that the MX4 automation is another feature that has improved the operation overall. “The operator turns on the equipment with a single touch of the crusher automation’s screen, which also enables the crusher operation to be monitored throughout the day and gives us a final report when the equipment is turned off,” he details.
On a weekly basis, the MX4 crusher is calibrated by initiating an automated procedure that takes five minutes at most. Calibration determines the degree of wear in wear parts and adjusts
the settings based on those findings. This assessment also enables the correction of any parameter that is not aligned with what has been pre-established by Minermix. The replacement of wear parts is performed after around 1200 hours of operation, which is more than one-third longer than before. Lifetime of the crusher’s linings is at least 30% higher, according to the company.
Established in 1984, Extrabase is a member of the Base Group (Grupo Base) focusing on civil construction. Specialized in the extraction, sale and distribution of crushed stone, gravel and sand, Extrabase has 12 operating units in the state of São Paulo, Brazil. Strategically located, the company’s mines ensure the supply of construction aggregates to the regions of Sorocaba, Piracicaba, Campinas and Porto Feliz, which are among the most affluent in Brazil’s wealthiest state.
The company’s own fleet of transport vehicles ensures a logistics system capable of serving customers within a radius of approximately 30 kilometers from the respective cities covered. Besides investing in the continuing development of its production processes, Extrabase also remains alert to environmental issues and seeks ever-more efficient means to lessen the impact on nature, engaging in conservation, reutilization of natural resources and reforestation as its main environmentally focused actions.
*Metso Outotec was formed July 1, 2020 when Metso and Outotec merged into one company. This case study has been written prior to the merger under the old company name.