Through testing, it is found that the quartz sand processing enterprises have the following serious problems: First, the dust concentration in the workplace generally exceeds the national standard, the total dust concentration exceeds the standard by 269.38 times, the highest is 1089.60 times; the dust concentration average exceeds 286.70 times, and the highest is 1248.35 times. Secondly, the content of free silica which is extremely harmful to the employees in the dust is extremely high. The content of free silica in the dust of the workplace of the tested enterprise is above 80%, the average content is 89.52%, and the highest is 96.47%. Third, most of the quartz sand processing enterprises, especially small enterprises with an annual output of less than 20,000 tons, especially small enterprises with dry processing, the processing technology is very backward, and the main links such as crushing, crushing, screening and packaging are adopted. They are all small and shabby, and the whole process is open and the dust is extremely serious. Fourth, most processing enterprises have chaotic operation on-site management, especially small enterprises with an annual output of less than 20,000 tons. There are no dustproof measures and protective equipment on the job site, and even the most basic dust masks are not equipped; the workplace is dusty, Site management is very confusing. Especially in recent years, the occurrence of mass silicosis caused by the dust hazard of quartz sand processing enterprises has occurred. In 2003, Guizhou Province and other places went to work in the quartz sand plant of Donghu Village, Xiawei Town, Xianyou County, Fujian Province, where they suffered from silicosis and died 18 people. In 2009, Shuifu County, Yunnan Province and other places went to Fengyang, Anhui Province. The migrant workers working in the county quartz sand factory suffered from silicosis and 12 deaths, which aroused the great attention of the Party Central Committee and the State Council leading comrades and made important instructions. All localities must deeply understand the seriousness of the dust hazard of quartz sand processing enterprises, and earnestly strengthen the rectification work of dust damage in quartz sand processing enterprises. Material Casing Pipe,Specification Casing Pipe,Seamless Steel Oil Casing Pipe Tianyi Steel Pipe Co., Ltd. , http://www.czseamlesspipe.com