At remote, high-altitude copper and gold mining bases, the waste generated daily from living camps and maintenance workshops exhibits distinct mixed characteristics. Food waste from the canteen (leftovers, fruit and vegetable scraps with 60%–80% moisture) is frequently mixed with maintenance area waste, such as oily rags, waste gloves, oil-soaked cotton yarn, and a small amount of plastic packaging. Strict separation is incredibly difficult.

If disposed of separately, food waste requires anaerobic fermentation or external transport (which is impossible when winter roads are snow-blocked). Oily rags belong to HW49 hazardous waste and require specialized collection, presenting severe logistical difficulties and storage risks.

Enter the small mine waste incinerator (processing 100–300 kg/day). Designed specifically for high-moisture and fluctuating calorific value mixed wastes, its oxygen-starved primary pyrolysis chamber slowly dries and gasifies wet materials. The independent high-temperature secondary chamber (≥850–900°C) completely decomposes oil smoke and mist. By utilizing the high calorific value of oily rags to compensate for the energy consumed to evaporate food waste moisture, it achieves "Wet + Oil" mixed feeding without volume reduction issues or black smoke. It has become the self-sufficient solid waste disposal solution for copper mine bases.

Below, we analyze the process adaptability and operational performance of customized equipment based on real-world data from a copper mine camp at 3,200 meters above sea level.

Disposal Challenges of Mixed Mine Waste and Incinerator Adaptability

Composition and Characteristics

• Food Waste: Sourced from the canteen, ~40–60 kg/day. High moisture, high salt, low calorific value (~3,000–5,000 kJ/kg wet basis). Direct combustion easily causes the primary chamber temperature to drop, leading to smoldering and smoke.

• Oily Rags / PPE: Sourced from the maintenance workshop, ~20–30 kg/day. Soaked in engine/gear oil with a very high calorific value (35,000–40,000 kJ/kg). However, burning them produces dense oil smoke and potential HCl (if mixed with PVC plastics).

• Mixing Ratio: In reality, both are often thrown into the same yellow medical waste bags or general solid waste bags. The mixed calorific value fluctuates wildly (8,000–15,000 kJ/kg).

Why Traditional Equipment Fails

• Standard Single-Chamber Direct Incinerators: When burning high-moisture waste in an oxygen-rich environment, water evaporation absorbs massive heat, dropping temps below 600°C. This results in thick white smoke (steam) mixed with black smoke (unburned organics).

• Standard Dual-Chamber Incinerators (Designed for dry waste): The primary chamber pyrolysis temperature is too high. Wet waste pyrolyzes too slowly, forming localized puddles of water and oil that drip into the ash, polluting the ground.

• No High-Altitude Correction: At 3,200m, atmospheric pressure is only ~68 kPa. Standard burners suffer from hypoxia, making ignition extremely difficult.

Customization Focus for Small Mine Waste Incinerators:

1. Enlarged Primary Chamber: Extended pyrolysis time under oxygen starvation (air coefficient 0.3–0.4) allows food waste moisture to slowly evaporate and enter the secondary chamber as pyrolysis gas.

2. Elevated Secondary Temp: Raised to 900°C (when oil content is high) to ensure total oxidation of oil mist and smoke.

3. High-Altitude Burners + Thickened Insulation: To combat the low-temperature, low-oxygen plateau environment.

4. Double-Layer Feeding Doors: To prevent odor escape (oily rags have a strong smell).

Equipment Customization: BNTET Configuration at a Copper Mine

Project Background (Desensitized):

• Location: A copper mining base in SW China; Altitude 3,180m; Winter -25°C, Summer peak 18°C.

• Scale: 220 resident staff; Daily mixed waste ~70–90 kg (Peak 120 kg).

• Available Space: 4×3m hardened ground (C30 concrete) next to the maintenance area; 380V generator power, deep well water, -35# diesel available.

• Requirement: General industrial solid waste self-disposal filing; smokeless/odorless; high-altitude/low-temp adapted.

Selection: BNTET Small Mine Waste Incinerator (Custom Batch-Type)

• Capacity: Max 80 kg/batch (1-2 batches/day covers 80–160 kg/day). Primary chamber effective volume 1.2 m³.

• Thermal Parameters:

• Primary Chamber: Pyrolysis at 600–700°C. Residence time extended to 60–90 min ("Wet Waste Mode"). Oxygen-starved air enters through bottom/side distributors.

• Secondary Chamber: ≥850°C (standard) to 900°C (high oil). Residence time ≥2s with strong turbulent tangential secondary air.

• Insulation: Primary chamber working layer is high-alumina castable + nano-microporous backing (Total thickness 200mm). Shell temp rise ≤+30°C in a -20°C environment.

• Purification: Rapid Quench (500°C→<200°C in <1s) + Dry Slaked Lime (Ca(OH)₂) + Activated Carbon + PTFE Baghouse. Zero wet wastewater.

• Fuel/Control: -35# High-altitude burner (Weishaupt/Riello) with heat-traced fuel lines. PLC with pre-set curves for "Wet/Mixed/Oily" modes.

Operational Record: Mixed Waste Feeding Strategy

Batch Mixing and Loading

• Layered Loading: Food waste (slightly drained in perforated plastic baskets) and oily rags are layered in a heat-resistant steel basket.

• Bottom: Dry paper/wood chips (for ignition, ~5 kg).

• Middle: Oily rags (spread loosely) + Food waste (in perforated stainless trays to prevent liquid pooling).

• Top: Dry cardboard scraps for ignition.

• The basket is loaded via a double-door system (interlocked negative pressure), minimizing manual contact with odors.

Pyrolysis & Oxidation Control

• Startup: Secondary chamber heats to 850°C; primary to 650°C.

• "Mixed Wet Feed" Mode: The operator selects this on the touch screen. The PLC automatically:

• Reduces primary air (air coefficient 0.35) and extends pyrolysis to 70 mins.

• Sets a lower limit alarm for the primary chamber at 620°C (briefly boosting air/fuel if it drops).

• Maintains the secondary chamber at 880–900°C to burn off oil mist completely.

• Visual Check: The observation window shows a dark red glow (carbon burning) with no visible flames (hypoxia), while blue flames of pyrolysis gas enter the secondary chamber.

(Processing 75 kg of mixed waste takes approx. 2.5 hours total. Two batches cover peak daily output).

Field Performance Data at the Mine Camp

• Temps: Primary Chamber: 630–680°C. Secondary Chamber: 885–915°C (Residence ≥2.1s).

• Quench Drop: 518°C → 192°C in 0.76s.

• Visual Exhaust: Colorless water vapor (faint white in winter). Zero black smoke or oil mist.

• Shell Temp: At -18°C ambient, the secondary chamber outer wall is 48°C (Excellent insulation prevents frost).

• Ash/Slag: Bottom ash Loss on Ignition (LOI) is 3.4%. Fly ash is managed per local HW18 or general solid waste agreements.

• Fuel Consumption: ~14 L/batch (including startup). If oily rags exceed 50%, diesel use drops to 10 L/batch due to self-heating.

Camp Logistics Manager Feedback: "Before, food bins froze and smelled terrible, and we hoarded oily rags for weeks waiting for a truck. Now, we burn a batch every other day. We get half a bucket of ash, no smoke, no oily smell, and we easily passed the environmental inspection."

High-Altitude & Extreme Cold Adaptations

1. Plateau Burners: Air pressure/volume correction curves (excess air coefficient 1.5–1.7 vs. 1.3 at sea level) ensure adequate O₂.

2. Fuel Line Heat Tracing: -35# diesel tank heated to 5–10°C; pipelines wrapped in 30 W/m self-limiting heat tape + 25mm elastomer insulation.

3. Cabinet Heating: 50W thermostatic heater maintains 10–15°C inside the IP65 control cabinet; touch screens are rated for -20°C operation.

4. Thickened Lining: Nano-microporous boards (50mm) + high-alumina castable (120mm) + corundum-mullite working layer (60mm). Total thermal resistance equals >200mm at sea level.

Comparison: BNTET Incinerator vs. Sorted External Transport

For remote copper mine camps, waiting for snow-cleared roads to transport food waste and oily rags separately is not viable. By utilizing a customized small mine waste incinerator, mixed waste undergoes oxygen-starved pyrolysis. Moisture slowly evaporates into pyrolysis gas, while the oil acts as auxiliary fuel. Fully oxidized in the high-temperature secondary chamber, the "Wet + Oil" mixture is reduced to 3%–5% of its original volume as sterile, inorganic ash.

With high-altitude thermal corrections, extended pyrolysis times, and low-temperature heat tracing, the BNTET small mine waste incinerator provides a practical, closed-loop solution for remote mining camps. Even in freezing, high-altitude environments, daily leftovers and oily rags are safely transformed into harmless ash and compliant water vapor.