Stone crushing produces a lot of dust. Dust consists of particles, which are dispersed in the air and remain there for a while. It is generated from mechanical actions, such as stone crushing, truck movement, etc. Although most dust particles can be seen with the naked eye, some cannot be seen without the help of a microscope. These fine dust particles can travel deep into the lungs and have the potential to cause the most damage. A 'dusty lung' (pneumoconiosis in medical terms) or severe chronic lung disease (called 'chronic-obstructive pulmonary disease', COPD in medical terms) is a common hazard caused by to much exposure to dust.
Several rocks such as granite and normal sand contain a substance called 'silica' in varying degrees, typically about 10 or 20%. This substance causes even more severe lung disease when inhaled as fine, man-made particles ('silicosis' in medical terms). These fine particles are typically found in the stone crushing process. Scar tissue forms deep in the lungs and makes the lungs less efficient and less strong. Over time, even AFTER work in stone crushing and the dust exposure has stopped, this destruction process in the lungs continues and the worker will eventually die from the damage.
Typical signs of lung damage by dust include difficulty breathing, shortness of breath, wheezing, constant coughing, reddish or bluish color of ears and/or the lips. This difficulty in breathing is often combined with fatigue, loss of appetite, weakness. As the professional manufacturer of complete sets of mining machinery, such as rotary kiln, Henan Hongxing is always doing the best in products and service.
Stone dust cannot be avoided in stone crushing. It is produced by the crushing itself, the sorting, the transport of gravel and also by vehicle movements over dusty roads. We can however reduce the amount of dust that reaches the lungs. By engineering controls, the places where dust is generated can be encapsulated so the dust is not easily carried off by the wind. Only after engineering and other controls have been used in all areas, personal protective equipment such as appropriate masks should be used. So-called Particulate Respirators Masks offer various amounts of protection depending on the type of filter and the fit provided. Using a cloth to cover the nose and mouth is NOT really protecting the worker.
There is no good short-term solution to the problem. Appropriate masks that protect workers from dust are often hard to find in developing countries. Even if they were available, the very high amount of dust would force the workers to change the masks or filters several times per day. In addition, the masks are often uncomfortable, specifically when one works in a hot climate.
The best solution is therefore to REDUCE the amount of dust that is being released into the ambient air. This can be done by:
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