"Kunshan Explosion" is a wake-up call for abrasives and abrasives companies

The Kunshan bombing incident touched the hearts of hundreds of millions of people at a time. In grief, we also had to pay attention to a problem - dust pollution. This is a common problem in industrial production. Repeated exposure to dust for a long time can cause severe lung damage to the pneumoconiosis. In the case of improper protection, dust is one of the causes of industrial explosion.

On June 30 this year, the National Health and Family Planning Commission reported on the website of the National Occupational Disease Report in 2013: 23,152 new cases of pneumoconiosis were reported last year, and the number of reported cases of pneumoconiosis accounted for 87.72% of the total number of reported occupational diseases in 2013. It can be seen that dust has become the most dangerous factor that harms the health of industrial workers.

What is productive dust?

Dust refers to solid particles that can be suspended in the air for a long time. The productive dust is dust formed during the production process. If the production dust is not controlled, it not only damages the working environment, damages the equipment, and endangers the health of the workers. It also pollutes the atmosphere. This Kunshan explosion is a typical safety production accident caused by productive dust.

Combustible dust suspended in the air, also known as explosive dust. The dust reaches the lower limit of the explosion. When it encounters the fire source, it will instantaneously burn. The high temperature causes the mixed gas generated in the limited space to expand rapidly and the pressure increases. This is the dust explosion. What is even more frightening is that in a relatively closed space where dust explosions generally occur, the heat generated by the explosion and the high-pressure gas cause a chain reaction. As long as the dust particles reach the space, a large amount of heat and pressure waves may be instantaneously generated, thereby generating Extremely serious consequences.

Productive dust classification and hazard status

Dust can be classified into inorganic dust, organic dust and mixed dust. It can also be classified into dust (inorganic dust with free silica content exceeding 10%), carbon black dust, aluminum dust (aluminum, aluminum alloy, alumina dust), welding fumes, etc. according to possible hazards.

Among them, the dust is common in the mining and selection industries such as coal non-ferrous metals, and the construction industry may cause silicosis. Carbon black dust is common in the paper and paper products industry, cultural and educational sporting goods manufacturing, and daily chemical products manufacturing, which may lead to carbon black pneumoconiosis. Aluminum dust (aluminum, aluminum alloy, alumina dust) is common in non-ferrous metal mining and dressing industry, light non-ferrous metal smelting industry, abrasive abrasive manufacturing industry, which may lead to aluminum pneumoconiosis. Welding fume is common in machinery industry, transportation equipment manufacturing, processing, brake beam processing, etc., which may cause electric welders to pneumoconiosis.

At present, China's abrasives industry, especially abrasive enterprises, are prone to generate dust during production and processing, especially in the process of smelting, crushing and grading. Therefore, abrasive grinding tool manufacturers have great production safety problems.

Industry statistics show that in recent years, China's chemical companies, flour mills, coal mines and other enterprises have repeatedly experienced dust explosions: 2002 food waste dust explosion incident in Guangzhou, Heilongjiang pulverized coal explosion in 2005, Kunming sulfur dust explosion in 2008, 2009 Zhejiang silica dust explosion incident, Hebei starch explosion incident in 2010, Chengdu Foxconn's polishing workshop in 2011, the dust collection duct flammable dust accident explosion. Since 2014, according to incomplete statistics, there have been seven publicly reported dust explosions (including the Kunshan explosion). These include 4 metal dust explosions, 2 food dust explosions and 1 chemical dust explosion.

How to prevent productive dust

Relevant technical measures taken in the prevention and control of production dust hazards include:

1. Give priority to the use of advanced production technology, technology and raw materials to eliminate the generation or reduction of dust. For process technology and raw materials, the corresponding dust-proof ventilation control measures should be designed according to the production process and dust characteristics.

2, the production process and equipment to produce dust, should be preferred to use mechanization and automation, to avoid direct manual operation, combined with the production process to take ventilation and purification measures.

3. Closed measures, set appropriate local exhaust and dust removal facilities to control the dust source, and take wet operation as much as possible;

4. The composition and arrangement of the ventilation system should be reasonable to meet the dustproof requirements.

5. The workshop adopts hot air heating, air conditioning and mechanical ventilation. The air inlet is installed in the outdoor air to clean and lower than the air outlet. For the ventilation system with fire and explosion protection requirements, the air inlet should be set to have no spark splash. In a safe place, the exhaust vents should be located in an outdoor safe place. The intake and exhaust devices of adjacent workplaces should be reasonably laid out to avoid short-circuiting of airflow.

6. The air volume at the air inlet should be determined by calculation according to the principle of preventing dust from escaping into the room. When conditions are met, they should be adjusted with measured data before being put into operation.

7. When the local exhaust hood cannot be sealed, the appropriate umbrella-shaped exhaust device should be selected according to different process operation requirements and technical and economic conditions.

8. In the workplace where the dust with explosive danger is released, an explosion-proof ventilation system or an accidental exhaust system should be provided.

In addition, while doing technical protection, we must also pay attention to organizational measures and medical preventive measures.

Personal protection (such as wearing dust masks) is a powerful complement to anti-dust measures. First of all, professional dust masks should be used. Generally, gauze masks can't meet the requirements of dustproofing. Professional dust masks must be used. Secondly, they should be suitable for their own face shape, so as to ensure that air does not pass through the mask and the gap of the face without passing through the mask. Filter into the respiratory tract. Then wear it according to the instructions for use, which can effectively prevent the dust, make it more comfortable after wearing the mask, and it is easy to breathe. The fourth is to be replaced regularly. When the dust mask is worn for a long time, the dustproof effect will be reduced or lost, and the deformation and pollution of the water in the use will be prevented.

The correct wearing step of the dust mask.
The company should also carry out regular maintenance and management work on plant protection equipment . Strengthen the publicity and education of workers who are exposed to dust. Regularly check the dust in the air of the production environment and do regular occupational examinations for workers exposed to dust. I hope that our industrial workers, while paying hard work, do not have to pay for health and even the cost of life because of small dust.

Grinding Consumables

The surface of mounting sample is not smooth. Grinding is to remove excess part of the sample with abrasive materials.

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