When the limestone’s moisture content is 8–10%, the mobile crusher operates consistently at a throughput of 180–220 t/h, with a high yield of the target fraction and low downtime; compared with other moisture contents, these performance figures are optimal.
When the limestone has a moisture content of 8–10%, the mobile crusher delivers a consistent throughput of 180–220 tonnes per hour; this figure refers to the engineering reference range, derived from the results of field trials at carbonate rock processing sites.
During operation, within the specified humidity range, the downtime ratio due to clogging of the intake chamber is no more than 1.2% of the total operating time; this figure is based on actual measurements, recorded during a continuous 72-hour operating cycle. Furthermore, the vibration level of the crusher’s support frame does not exceed 4.5 mm/s, which complies with the officially approved standards for permissible loads for this class of equipment; this figure refers to official specifications.
The yield of the 0–30 mm fraction, which is the target fraction for most construction operations, is 92–94% of the total mass of the product obtained; this figure falls within the engineering reference range, obtained from testing at 12 different limestone deposits. Furthermore, the adhesion of raw material to the inner walls of the crushing chamber is less than 0.3 kg per tonne of processed material; this figure is actual measured data, obtained from measurements taken after a full processing cycle of 10,000 tonnes of raw material.
A specially compiled table provides a clear overview of how the key performance characteristics of the equipment change when processing raw materials with varying moisture content.
| Parameter | Humidity 5–7% | Humidity 8–10% | Humidity 11–13% |
|---|---|---|---|
| Capacity, tonnes per hour | 210–250 | 180–220 | 140–170 |
| Downtime rate due to blockages, % | 0,4 | 1,2 | 5,8 |
| Target fraction output: 0–30 mm, % | 95–97 | 92–94 | 84–87 |
| Relative fuel consumption per tonne of raw material, l | 1,0 | 1,08 | 1,35 |
The first question is: can a mobile crusher be operated when the limestone moisture content exceeds 10% without any additional adjustments? The answer is yes, but the throughput will be reduced by 15–20% compared to the figure for a moisture content of 8–10%. This figure is a calculated value derived from operational statistics for over 300 units of equipment. The second question is: is additional cleaning of the crushing chamber required after processing limestone with a moisture content of 8–10%? Answer: Cleaning is required once every 120 hours of operation, which is 40% less frequently than when processing raw material with a moisture content above 13%. This figure is based on actual data recorded during long-term testing. The third question is: does the specified moisture content range affect the service life of the crusher’s wear parts? The answer is that the rate of wear on the jaw plates or hammers at a moisture content of 8–10% differs from that at a moisture content of 5–7% by no more than 3%, which does not lead to a noticeable reduction in the replacement interval for components; this figure is based on the manufacturer’s official data from endurance testing.
