Is there any pollution in the production of cemented carbide?
The main pollutants in the production of cemented carbide are dust, waste residue and waste water, and the biggest influence on the environment is soot. According to regulations, waste gas can be divided into two categories: particulate matter, exhaust gas and gaseous pollutants. The exhaust gas of ferroalloy plant comes from ore smelting furnace, refining electric furnace, roasting rotary kiln, multi layer mechanical baking furnace and aluminum metal smelting furnace. Ferroalloy plant exhaust emissions, dust concentration is high, 90% of exhaust gas is silicon dioxide, but also contains chlorine, nitrogen oxides, carbon monoxide, sulfur dioxide and so on. Waste residue and waste water are the most serious pollution of chromium compounds, and there are also pollution of nickel compounds.The State Economic and Trade Commission, the State Environmental Protection Administration and other departments also jointly issued "on accelerating the restructuring of China's ferroalloy industry views" (in the economic and trade industry [1999]633), from 1999 to 2005, to stop the new types of ferroalloy electric furnace (kiln) and blast furnace.
The chosen of mask filter is good, also want to close modified ah buy mask anti fog and haze, one can see the standard, can be seen in the two to see that the filtration efficiency standards, should be the most familiar N90, N95 series of mask 3X brand, which is based on NIOSH standard name. In addition to the NIOSH standard, common and ASTM ASTM standard, China standard KN and the European FFP standards, can be used to measure an important indicator of masks, medical masks ordinary cheap, protective also poor, it is only suitable for ordinary nurses or at home cooking; and senior medical masks are surgery the doctor or dentist, the doctor does not care about the higher income, cost is low and the mask, pay more attention to the quality of respirator. The high grade medical mask has excellent barrier to particles and fluids, and ensures breathability and breathability in a precise working environment. Can deodorant ah, city toxic particles source: the first is the automobile exhaust the United States imported medical masks Hiroe server Hin, filter, not only anti particles but also prevent droplets. The particles as small as 0.1 micron filtration efficiency up to 99.8% of bacteria or virus vector as small as 0.3 microns (common in droplet) filtration efficiency is up to 99.9%. Using SecureFit patented technology, through adjustment to adapt to different facial shapes, to achieve high consistency, for your health and family, go out wearing masks, in the J good style East, I wish you happiness, hope to adopt
There is no pollution, the most basic production, carbon dioxide, sulphur dioxide after heating, heavy water generated after, there are also the noise, dust, harmful substances should be there on the edge of it, so do the work people must take the mask ah, ordinary mask should be useless the kind of good filtration mask, good sealing performance should be divided into ordinary medical masks, and senior two. Ordinary medical masks cost is not high, protection is not outstanding; and senior medical masks is surgery the doctor or dentist, pay attention to the fluid barrier, filtration of particles, guarantee in precision work environment with permeability, haze and mean gray dust, haze (Yan Xia) in the air of sulfuric acid, nitric acid and other disorders that cause visual history of haze. The difference between haze and fog is that when the haze occurs, the relative humidity is not large, while the relative humidity in the fog is saturated. (if there is a large amount of condensation, the relative humidity may not reach 100%, it may appear saturated). Sources of toxic particulate matter in cities: first of all, automobile exhaust. Diesel vehicles are the highest standard American imports of medical masks, such as Beijing work guard Xin, filter good, not only anti particles, but also anti droplets.
