On October 22, the Qingdao Environmental Protection Bureau of Shandong Province issued a report saying that in order to better understand the level of marine biological radiation in Qingdao's coastal waters, according to the requirements of the Ministry of Environmental Protection's radiation environment monitoring plan, the first monitoring of radiation and marine life was conducted and two new A marine biological control point, identified the small yellow croaker and shellfish cultured by the general public as monitoring targets, and the locations were respectively located in Lushan and Jimo. The monitoring projects were 锶-90 and 铯-137. Pulverizers are machines that pulverize large solid materials to the required size. Pulverizer Machine,Crushing Machine,Milling Machine,Grinding Mill, Grinding Machine JIANGYIN CITY XUAN TENG MACHINERY EQUIPMENT CO.,LTD , https://www.machineryxuanteng.com
It is understood that yttrium-90 is one of the fission products of uranium, with a half-life of 28 years, generally from nuclear explosions or nuclear fuel products.锶-90 is a highly toxic nuclear species that accumulates mainly in bone and is difficult to excrete. Strontium-137 is a kind of heavy metal with strong radioactivity. If the human body intake exceeds a certain value, it will lead to hematopoietic and nervous system damage, abnormal birth and even sterilization, and even cause death.
Up to now, environmental monitoring personnel have completed the collection of samples and have been delivered to the municipal environmental monitoring center station laboratory as required. The testing and analysis personnel will perform pretreatment steps such as drying, grinding, carbonization, and ashing to reach and comply with the national requirements. After the analysis of standards, radiochemical analysis and instrument analysis are performed. The analysis results will be reported directly to the Environmental Monitoring Technology Center of the Ministry of Environmental Protection.
In the next step, marine bio-irradiation monitoring will be implemented regularly as a routine monitoring task for environmental protection in Qingdao, and through the long-term accumulation of basic data, the level of bio-irradiation changes in the coastal city's coastal waters will be more accurately analyzed and reflected.
According to the size of the crushed material or the crushed material, the mill can be divided into coarse crusher, medium crusher, fine mill and superfine mill. There are four kinds of external forces applied to the solid in the grinding process: pressing, cutting, impact and grinding. Press rolling is mainly used in coarse and medium crushing, suitable for the crushing of hard materials and bulk materials. Shearing is mainly used in fine crushing, suitable for the crushing of ductile materials. Impact is mainly used in medium crushing, fine grinding, ultrafine grinding, suitable for crushing brittle materials. Grinding mainly in fine grinding, ultrafine grinding, suitable for small pieces and fine particles.
The crusher makes use of the high speed relative motion of the movable tooth plate and the fixed tooth plate, so that the crushed object can be crushed by the comprehensive action of tooth impact, friction and the impact between the materials. The crusher is suitable for crushing Chinese herbs, precious medicinal materials, ores and chemical raw materials in small batches in various varieties, alloys, metallurgy, geology, scientific research and other units.
The pulverizer machine has the advantages of simple structure, solid, stable operation and good crushing effect. The pulverized material can be discharged directly from the grinding chamber of the main machine. The particle size can be obtained by replacing the mesh screen with different aperture. The powder collecting chamber adopts the completely closed silencer structure, which can effectively reduce the working noise. In addition the machine is all stainless steel. The inner wall of the casing is machined to achieve smooth surface, which changes the phenomenon of rough inner wall and powder accumulation of the previous models, so that the production of drugs, food, chemical industry and so on is more in line with national standards and meet the requirements of GMP.