900x1800 Ball Mill for Sudan Gold Ore Processing
The 900x1800 ball mill is a 0.65-2 t/h overflow grinding mill with a 900 mm cylinder diameter and an 1800 mm cylinder length, used as the primary grinding stage in small-scale gold ore beneficiation. Baichy builds the 900x1800 ball mill with an 18.5 kW drive for wet grinding circuits in Sudan gold operations.
Why Is the 900x1800 Ball Mill Matched to Sudan Gold Ore?
The 900x1800 ball mill matches the throughput band of Sudan's artisanal and small-scale gold mining (ASGM) sector, which held 91.5% of the country's declared gold production in 2024 at 53.6 tonnes (SWISSAID, African Gold Report, May 2025).
The 900x1800 ball mill accepts a 20 mm maximum feed size and discharges at 0.075-0.89 mm, the range in which gold particles are liberated from gangue ahead of gravity separation or cyanidation. Free-milling gold ore is defined as ore from which over 90% of the gold is recoverable by conventional gravity-cyanidation at a grind size of 80% passing 75 µm (Sepro Systems, Gold Recovery 101), and 75 µm sits at the fine end of the 900x1800 ball mill discharge range.
Upstream of the mill, hard rock gold ore is normally crushed to under 25 mm before it reaches a ball mill, which is why a fine jaw crusher or a hammer crusher sits ahead of the grinding stage. Published guidance for the 900x1800 ball mill places it at a daily processing capacity of 20 to 40 tons, so one mill covers the grinding stage.
900x1800 Ball Mill Technical Specifications
| Parameter | Value |
|---|---|
| Model | 900×1800 |
| Cylinder Rotating Speed | 36–38 r/min |
| Ball Weight | 1.5 t |
| Feeding Size | ≤20 mm |
| Discharging Size | 0.075–0.89 mm |
| Capacity | 0.65–2 t/h |
| Power | 18.5 kW |
The figures above are published for continuous wet grinding at the stated 20 mm feed size with a 1.5 t ball load. The 900x1800 ball mill is the smallest model in the range: the 1200x2400 ball mill is rated 1.5-4.8 t/h at 30 kW, and the 1500x4500 ball mill 3-6 t/h at 110 kW.
900x1800 Ball Mill for Sudan Gold Ore Processing
How Do You Size a 900x1800 Ball Mill for a Small Gold Plant?
Size the 900x1800 ball mill from three numbers: maximum feed size in mm, target throughput in t/h and target grind size in µm. Feed above 20 mm pulls the 900x1800 ball mill below its published 0.65-2 t/h, because the mill then does crushing work instead of grinding work.
The mill is charged to a 35-45% filling rate with a 1.5-2.0 t ball load. The first charge uses three ball sizes rather than one: Φ60-80 mm at 30-40% for impact, Φ40-60 mm at 30-40% for intermediate grinding, and Φ20-30 mm at 20-30% to fill the gaps between the large balls. Small balls wear down naturally, so only large balls are topped up afterwards.
Wet overflow grinding is the standard configuration for gold ore; dry grinding of the same model needs feed moisture below 2%, above which powder pastes onto the balls and liners and output collapses. The mill is edge-driven through a girth gear, runs on an 18.5 kW motor, and needs a level concrete foundation with anchor bolts re-checked after the first weeks. Loose liner bolts and girth gear mesh are the two most common causes of banging noise and vibration.
Grinding Circuit Layout for Sudan Gold Ore
A 900x1800 ball mill in a Sudan gold circuit sits between a fine crusher and a gravity or leach stage, working in closed circuit with a spiral classifier or hydrocyclone that returns oversize to the mill. Closed-circuit classification holds the discharge in the 0.075-0.89 mm range and stops over-grinding of liberated gold.
A gravity concentrator inside the grinding loop recovers coarse liberated gold before the slurry reaches the leach tanks, and every 10% of gold recovered by gravity adds about 1% to overall plant recovery (Sepro Systems, Gold Recovery 101). Where the ore is free-milling, the mill product feeds a gold ore beneficiation process built on carbon-in-leach or carbon-in-pulp: cyanide leach with activated carbon, then desorption and electrowinning to doré.
Where gold is encapsulated in pyrite or arsenopyrite, milling alone does not liberate it, and the circuit needs flotation plus roasting or bio-oxidation ahead of cyanidation. In that flow the 900x1800 ball mill is selected for tonnage, and the pre-treatment step is what decides recovery.
FAQ: 900x1800 Ball Mill for Sudan Gold Ore
1. What is the capacity of a 900x1800 ball mill?
The 900x1800 ball mill is rated 0.65-2 t/h at a 20 mm maximum feed size, with a 1.5 t ball load and an 18.5 kW motor. Published guidance for the 900x1800 ball mill also places it at a daily processing capacity of 20 to 40 tons.
2. What motor power does the 900x1800 ball mill use?
The 900x1800 ball mill uses an 18.5 kW motor in its standard configuration, and the same model is offered with a 22 kW motor as an option. Motor, girth gear and pinion are quoted together with the mill so that drive loads and foundation sizing match the selected power.
3. What is the maximum feed size for the 900x1800 ball mill?
The maximum feed size for the 900x1800 ball mill is 20 mm. Ore above 20 mm should be reduced by a fine crusher first, because oversize feed makes the mill perform crushing instead of grinding and pulls throughput below the rated 0.65-2 t/h.
4. How much does a 900x1800 ball mill cost?
The 900x1800 ball mill is quoted per project, because liner type, motor rating, drive arrangement and control level change the price of the same mill size. Send the ore type, maximum feed size in mm, target throughput in t/h and target grind size in µm to receive a quotation.
5. What ball sizes go into a 900x1800 ball mill?
A 900x1800 ball mill takes a 1.5-2.0 t charge at a 35-45% filling rate. Load three sizes: Φ60-80 mm at 30-40% for impact, Φ40-60 mm at 30-40% for intermediate grinding, and Φ20-30 mm at 20-30% to fill the gaps between large balls. Top up the large balls only.
Baichy Heavy Industry
Baichy Heavy Industry is a high-tech mining equipment company integrating R&D, manufacturing, sales, and after-sales service. Focusing on crushing, grinding, and mineral processing equipment, we provide professional solutions to our customers. We are ISO9001:2015 、certified, and our products include mobile crushing palnts, crawler crushing plant, construction waste crushing plants, jaw crushers, sand making machines, cone crushers, fine crushers, grinding mills, ball mills, etc., all with reliable performance to meet diverse project needs.
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