The processing technology of stone has cutting processing, grinding and polishing, special-shaped processing (engraving, edging, chamfering), inspection and repair. From May to August 2013, the Department of Occupational Health of the State Administration of Work Safety Supervision organized the investigation and on-site inspection of 20 stone processing enterprises in 6 provinces across the country. The dust concentration in the workplace was exceeded. The content of free silica in the dust of 20 stone processing enterprises is between 2.62% and 42.12%, and the content of only 3 enterprises is below 10%, and the remaining 17 are higher than 10%. The dust concentration of all jobs exceeds the national standard. The dust concentration was 1.852mg/m3-852.00mg/m3, which exceeded the maximum limit of 852 times; the dust concentration was 1.20mg/m3-124.33mg/m3, which exceeded the maximum of 177.61 times.
The problem of causing such a large amount of dust is that the process of generating a dust source at the processing site is not effectively dust-removed. Many small and micro enterprises basically do not have any protective measures. The workers simply have a dust-proof door cover, and some scales are relatively small. Large enterprises only use the simple negative pressure fan to discharge the dust directly into the air. Due to the limited space of the fan, many places where dust is generated cannot discharge the dust, so the whole working environment is in a gray state, and the dust is not carried out. Any purification treatment is directly discharged into the atmosphere, which has a bad impact on the environment. It is simply a surface article, and it is not fundamentally aware of the pressure of dust pollution on the environment.
Dust pollution seriously restricts the development of the stone industry, the increasing cost of occupational diseases, the increasing pressure on environmental protection, and the difficulty of recruiting workers to work. The sustainable development of an enterprise must assume the responsibility of the society. The short-term benefits of sacrificing the environment are not long-lasting, and the price paid is irreparable. Therefore, it is extremely urgent to choose an efficient energy-saving and environmentally-friendly dust-removing equipment.
At present, the main cleaning equipment for stone dust is water-washing dust removal equipment, water-washing silent dust removal equipment, and pulse dust removal equipment. The main principle of the water-washing equipment is that the suction force generated after the fan is operated causes the dust generated during the grinding to flow to the dust filter of the dust-removing cabinet, and the dust and water are mixed by six layers of filtration to form a slurry and settle into the water tank, and the purification effect reaches 95%. The equipment power ranges from 3-9kw, and the single purification area is 12-20m2. Its good ventilation and ventilation characteristics make the concentration of harmful substances in the working area lower than the maximum allowable concentration specified by the state. The filtered gas is discharged directly to the outside or further environmentally friendly.
The pulse type dust removal equipment can be used for both wet and dry. The main principle of the equipment is to suck the dust in the grinding process to the surface of the filter element through the suction of the fan, and automatically blow back the dust in the set interval time by the pulse valve control. The dust is directly settled into the water tank, and can be directly discharged by mixing the water into a slurry, or the dry powder can be kept out of the machine. The device is equipped with a key automatic sewage device, which is more convenient for maintenance and maintenance, and the purification efficiency reaches 99.7%.
These products can be used in a single unit or in different sizes and sizes according to the size of the sanding area and the shape of the polished workpiece to meet the grinding effect and requirements.
The use of dust removal equipment does not change the working habits of workers, but it improves the working environment of employees and controls the hazards of occupational diseases from the source; the purification rate reaches 99.7%, exceeding the national environmental protection standards; workers start synchronously at work; stop working After that, the device has a delay automatic stop function. It is technically effective and energy-saving; the equipment adopts PCB touch switch control, high degree of automation, safety, dustproof, moisture proof, and trouble-free operation; the device has automatic flushing, one-button automatic sewage device, and maintenance, which greatly reduces the The cost of the customer's use creates greater economic benefits for the customer.
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