Optimizing Potash Recovery: Crystallization, Compaction & HLD Mine Methods

Source: Buffalo Potash Corporation (2026)
Website: https://www.buffalopotash.ca/

Critical Data

Overview

Buffalo Potash Corporation (BPC) is advancing potash recovery at the Disley Project in Saskatchewan, Canada, with a staged development plan that begins with an Initial Production Module (IPM) and scales to full High Legacy Deposit (HLD) mines. The IPM, situated on Section 10-20-23W2, leverages proximity to roads, power, and natural gas to produce 125,000 tonnes per year of soluble muriate of potash (MOP). This facility allows BPC to optimize mining and processing before commissioning two 500,000 t/a HLD mines at Disley West and Disley East. The recovery process relies on hot brine injection into underground caverns to dissolve KCl-rich ore, followed by two-stage crystallization, centrifuging, drying, and compaction to produce granular potash. The two-stage crystallizer system cools recovery brine from 45°C to 13°C, using a barometric condenser and chiller package for heat recovery. Mother liquor is recycled to injection wells, minimizing waste. The full-scale HLD plants include compaction circuits to convert crystallized potash into durable granular products, with glazing and screening to meet market specifications. BPC’s method emphasizes energy efficiency through heat recovery and reduced reagent consumption, aligning with sustainable mining practices. The Disley Project represents a significant step in Canadian potash production, with the IPM serving as a testbed for innovative technologies like the Vortex Crystallizer, which promises lower capital and operating costs.

Key Process Stages

• Stage 1: Brine Recovery and Injection – KCl-rich brine from production wells at 45°C is received in tank T1100, with dilution water added to prevent crystallization. Mother liquor and make-up water are heated to over 50°C using natural gas-fired heaters (50 psia steam for IPM; three heaters for HLD) and injected into the cavern via pumps P001/P002 (IPM) or multiple injection pumps (HLD).
• Stage 2: Two-Stage Crystallization – First stage crystallizer X100/X1100 cools brine from 45°C to 32.5°C via barometric condenser BC100/BC1100. Second stage crystallizer X101/X1101 further cools mother liquor to 13°C using a chiller package (CH100/CH1100) and heat exchanger, producing high-grade KCl crystal slurry.
• Stage 3: Centrifuging and Drying – Product slurry from crystallizer X101/X1101 is fed to screen bowl centrifuge C200/C1200-C1201, delivering a cake with <5% moisture. Rotary dryer D200/D1200 reduces moisture to <0.2%. Exhaust gases are treated in baghouse BH200/BH1200 for dust collection.
• Stage 4: Compaction and Glazing (Full-Scale HLD Only) – Dried product is compacted via compactors CC1401-CC1402 and flake breakers, then screened. Oversize is gently crushed in CagePaktors. Granular product receives 1.5% w/w water in glazing screw SC1501, then cooled to 80°C in a fluid bed dryer-cooler. Polishing screens ensure final product size.
• Stage 5: Product Storage and Loading – Granular and soluble products are conveyed to storage via tripper belt conveyors. Reclaim uses loaders and bucket elevators, with a loading weigh bin system for railcar or truck loading. Dedust and amine treatment are applied to meet quality specifications.

Additional Interesting Data and Summary

The Disley Project’s recovery methods are underpinned by comprehensive mass balances developed for both the IPM and full-scale HLD plants. The IPM mass balance sizes equipment for 125,000 t/a while the HLD wet-end mass balance supports 500,000 t/a per plant, based on an average ore grade of 33.66% KCl, 0.55% Carnallite, 6.64% insolubles, and remainder NaCl. The two-stage crystallization system incorporates heat recovery via a barometric condenser, reducing the heating load for brine injection – a key energy efficiency measure. Utility systems include instrument and plant air dried to -40°C dew point, fresh water from a potable well, and amine/dedust oil treatment at 60°C for product conditioning. The full-scale HLD plants produce 100% granular MOP with a compaction circuit that includes flake breakers, CagePaktors, and glazing at 1.5% water addition, followed by fluid bed drying to 80°C. Dust collection is managed by baghouses (BH1501, BH1502) with exhaust stacks. Environmental considerations are evident in the closed-loop brine recycling: mother liquor is returned to injection wells, and purge brine is sent to disposal wells only when necessary. BPC plans to test the Vortex Crystallizer during IPM operation, which could reduce CAPEX and OPEX significantly. Economically, the staged approach minimizes risk and allows process optimization before full-scale development. The project also benefits from existing rail infrastructure (Figure 18.2) and proximity to markets. Looking ahead, the dual HLD mines (West and East) will double capacity, positioning Buffalo Potash Corporation as a significant producer in the Saskatchewan potash basin. The commitment to energy recovery, reduced water usage, and innovative crystallization aligns with industry sustainability trends. With a 330-day operating schedule and robust equipment sizing based on proven supplier data, the Disley Project is poised for reliable, high-efficiency potash recovery.

Key Processes: Crushing

Target Commodities: N/A