Preclassification system feasibility study, design, and construction support

About this project

client
U. S. Steel Corporation
location
Minnesota
cost
$950,000 (Barr's fees)
completion date
2020

When U.S. Steel – Minntac installed hydro cyclones to its Step III concentrator lines prior to flotation, it experienced a decrease in flotation feed mass flowrate by approximately 50% and a subsequent increase in the flotation plant recovery. Encouraged by this success, Minntac sought to evaluate the feasibility of installing hydro cyclones on its Step I and II concentrator sections to improve the flotation plant iron recovery as well.

In 2017, Barr conducted a feasibility study, and when the results were favorable, we went on to provide preliminary engineering, detailed engineering, procurement support, and onsite construction support for one section in Step I, which was completed in mid-2019. Barr also completed an engineering design package for the remaining four sections in Steps I and II in late 2020.

The equipment layouts proved to be a challenge on this project as several gravity launders and pipes required a specific slope to operate properly but space and elevation were limited to make everything fit together.

Key team members

Sean Grand

Mechanical Engineer

Nick Sosalla

Minerals Processing Engineer

Lance Larsen

Electrical Engineer

John Maxwell

Structural Engineer

Jim Jagunich

Vice President
Senior Electrical Engineer

Richie Kennedy

Mechanical Engineer

Related design and construction projects

Spillway upgrades at St. Cloud Dam
Testing and optimization of fine-tailings drying technologies
Third-party transmission-line construction monitoring
Phase I ESA for copper-nickel project
Ore transportation study
Dry-stack tailings management
Permitting, environmental assessment, and design for copper-nickel mine
Tailings basin expansion and closure options
Groundwater monitoring for Fridley Filtration Plant rehabilitation
Engineering services and permitting assistance for Bison 2 and 3 wind farms
Geotechnical, structural, and civil work for Canadian wind farm
Geotechnical investigation and design for expansion of ancient gold mine
Redevelopment services for Surly destination brewery
Groundwater modeling for 1,4-dioxane
First-of-its-kind spent-lime stormwater BMP treatment system
Design services for solar generation facility
Albert Lea Lake outlet modifications
Scoping study to increase magnetite-concentrate production capacity
Oxbow-Hickson-Bakke ring-levee flood protection
Engineering services for pipeline reversal
Bathymetry and sediment studies for dredging and restoration of Minnesota lake
Mine closure and reclamation
Environmental integration support for Wamsutter Crude Oil System
Engineering and design for Universal Studios’ rapids ride
Landslide stabilization design for an underground coal mine
Geologic modeling and mine-plan development for aggregate quarries
Resource estimates for neodymium-rich rare-earth-element exploration project
Retrofit design for a city-campus parking lot
Greenway design to treat stormwater and mitigate flooding
Inspection, design, and construction oversight for tunnel rehabilitation
Stormwater retrofits along redesigned urban streets
Stormwater treatment wetland for Minnesota college arboretum
Waste-gas scrubber design engineering for taconite pellet plant
Expansion of landfill-gas-fired power generation facility
Installation of new auxiliary boilers for power plant
Permitting and environmental review for pipeline terminal expansion
Earthen embankments reduce flooding and sediment loading in rural creek
Upgrades and expansion for silica-sand wet plant
Reclamation of legacy tailings site
Engineering services for frac-sand operation
Environmental review and prefeasibility design for planned uranium mine
Project prioritization tool for Minnesota watershed district
Flood-control modeling and system upgrades in urban neighborhoods
Sustainable site design for watershed district headquarters
Green infrastructure treats stormwater along light rail corridor
Engineering services for municipal wastewater-treatment facility
Powerhouse and turbine replacement at Redwood Falls
Permitting and wetland delineation for a community solar garden
Penstock replacement at McClure Dam
Creation of LID master plan for stormwater management
Highwall stability assessment
Demonstration rainwater gardens reduce stormwater runoff
Mine remediation and reclamation
Steam-line evaluation at Rapids Energy Center
Air quality permitting for distributed-generation plant
Discovery Point ecological restoration
Fish-habitat and floodplain restoration of a Minnesota trout stream
Investigation and design for Freeway Landfill
Stormwater basin retrofits for water quality improvement
Engineering design for crude-oil-terminal pipe rack
Self-contained bog built on college roof
Landslide stabilization and corridor repair for state highway
Engineering design for pipeline pump stations and terminals
Tailings-management area design and construction
Spillway design for iron-ore-mining and mineral-processing facility
Gate automation for the Soo Locks compensating works
Natural channel design for aquatic organism passage
Natural stormwater-treatment system and park redevelopment
Engineering and design for SeaWorld’s Infinity Falls water ride
Environmental site assessments for future site of mining and processing facility
Sweeney Lake and Schaper Pond water-quality improvement
Upgraded levee system manages flood risk for Minot residents
Hall's Island and Scherer site reconstruction
Resource assessment and permitting assistance for industrial sands facility
Structural monitoring of sanitary sewer line
Minnetonka Mills Park design
Engineering services for industrial chemicals mine and processing facility
Trona-mining production optimization
Permitting and compliance services for oilseed-processing plant
Remediation and redevelopment of historic dump
Geotechnical assistance for mine expansion at Julienne Lake
Environmental review for peaking plants
Flood risk reduction for North Dakota city
Engineering and design services for new truck dumper
Compliance, resource, and process evaluations for potential mining sites
Stormwater-basin retrofits improve water quality and habitat
Natural stormwater-treatment system and park redevelopment
Cost analysis for meeting water quality standards
Green infrastructure retrofit of an urban shopping-mall parking lot
Auxiliary boiler installation
Dry Spotted Tail Creek stream restoration
Remediation and residential redevelopment of Whitehall Leather site
Regulatory-compliance assistance for Freeway Landfill
Retrofit engineering for ash conveyance
Hall’s Island redevelopment and restoration
City of New Brighton water treatment plant design
Design and permitting for WISCO Oilfield Special Waste Landfill
Chlor-alkali process design
Support for decommissioning and demolition of manufacturing facility
Option study and design for air jig dewatering system
Permitting, design, and construction oversight for CCR surface impoundment
Brownfields redevelopment for watershed district headquarters
Preliminary design for PFAS-related drinking-water treatment
Renovation of historic Peavey Plaza in downtown Minneapolis
Transmission-line permitting assistance
Air permitting for petroleum refinery’s waxy-crude processing project
Redevelopment of former Mayflower Mine
Permitting for greenfield renewable diesel production facility in Utah
Permitting for the conversion of a petroleum refinery to renewable diesel production
Geotechnical investigation for the East Valley Battery Storage Facility
Geotechnical highwall assessment at Bald Mountain
Civil engineering services for 10 MW solar facility
Structural analysis and evaluation of powerhouse
Above-ground tailings management and mine backfill
Air-quality services for steel company
Crane walk geotechnical engineering at Kings Point wind site
Analysis of microbial ecology in selenium bioreactor
Statistical analysis of coal-silo vibrations
Rushford levee system remediation
Cyclic degradation geotechnical evaluation for wind turbine foundations
Upgrades to mineral processing plant
Aggregate resource estimate along proposed pipeline routes
PFAS-impacted drinking water response and treatment plant design
Novel steam methane reformer hydrogen generation skid design