Cheap Wet Drum Separator

A cheap wet drum separator is not a marketing gimmick, but a real solution for enterprises where every thousand rubles spent on equipment affects the profitability of processing. We have repeatedly encountered situations where customers brought samples of crushed clay or recycled materials from construction waste to the workshop - and demanded that fractions below 5 mm be separated without losing valuable material. In 80% of cases, standard dry screens produced dust, clogged screens, and washing in trays resulted in uneven cleaning. Only a wet drum separator provided a stable output of clean sand and gravel at a water flow rate of up to 8 m³/hour.

Why "cheap" does not mean "unreliable"

The word "cheap" in the context of a wet drum separator is often met with skepticism. But the price here is the result of engineering decisions, and not compromises with resources. Over the past 5 years, we have modernized three generations of drums: we increased the body wall thickness to 16 mm, used reinforced SKF bearing units with double seals, and switched to adjustable drive belts instead of chains. The result is that the service life of the main unit has increased from 3 to 7 years with daily operation of 16 hours. The cost of such equipment remains lower than analogues by 22–35%, because production is concentrated in one technology park, without intermediaries and imported components.

The key parameter is the angle of the drum. In cheap Chinese models it is fixed at 3°, which is bad for viscous clays. Ours ranges from 2° to 6°, mechanically adjustable. This makes it possible to adapt the separator to specific raw materials: with a high clay content, the angle is reduced, increasing the residence time; with coarse sand - increase it to speed up the passage. This flexibility saves up to 18% of electricity per month.

Where are the most common mistakes made when choosing?

We record three common mistakes. The first is ignoring the hydraulic load. Some buyers choose a separator based on motor power (for example, 15 kW), but do not check how it will cope with a feed density of 120 t/hour at a humidity of 25%. As a result, the drum “sinks” in the sludge, washing stops, and the yield of pure product drops by 40%.

The second mistake is an incorrect water supply scheme. Cheap units are often equipped with a single sprayer at the beginning of the drum. In practice, this leads to the fact that the first 2 meters are washed well, and the last 3 are almost dry. We have three feeding zones: the first is for pre-wetting, the second is for intensive cleaning, and the third is for final rinsing. Each zone has a separate tap and pressure gauge.

The third is underestimating foundation requirements. A wet drum separator weighs between 8 and 14 tons in operating condition. If the base is not designed for dynamic load when rotating at a frequency of 12–18 rpm, vibration begins. After 3 months, this destroys the welds in the connection between the drum and frame. We always include foundation drawings indicating the grade of concrete, laying depth and type of anchors.

How to reduce your total cost of ownership

The purchase price is only 35-40% of the total cost of ownership. The rest is exploitation. To reduce it, we implemented three solutions:

• Replaceable drum segments— wear-resistant steel 110G13L with hardness HRC 52–56. Replacing one segment takes 45 minutes, without dismantling the entire drum;
• Automatic water level control— float-type sensor with delay relay. Prevents running dry and overflowing;
• Modular assembly system— all components are fastened with bolts of class 10.9, and not by welding. When replacing a bearing, you do not need to wait until the metal cools down.

At one of the quarries in the Belgorod region after switching to ourscheap wet drum separatormanaged to reduce downtime for maintenance from 16 to 3 hours per month. Savings - 217 thousand rubles per year only on the wage fund for repairmen.

What to check before ordering

Before making a decision, ask the supplier:

1. Drum leak test report (pressure 0.3 MPa, hold time 30 min);
2. Certificates for the steel of the body and segments (the chemical composition and impact strength at −20 °C must be indicated);
3. Photo of actual installation on site indicating the date and region;
4. Calculation of hydraulic resistance for your fraction is not an abstract table, but numbers taking into account density and friction coefficient.

LONGI Corporation provides all this free of charge. The company has been operating since 1993, its production site in Fushun is 140,000 m², more than 1,200 employees, 60% of them are engineers with higher education. 4,000 units of mining equipment are produced annually. Information about current models of wet drum separators, including technical data sheets and connection diagrams, can be found on the website ljmagnet.ru.

The cheap wet drum separator is not a simplified version, but an optimized one. He works where others refuse. And it retains its value not in the first month, but in the fifth year of operation.