National "" Thirteen Five "National Science and Technology Innovation Plan" proposed to develop eco-environmental technology, Beijing-Tianjin-Hebei comprehensive environmental governance, soil pollution control, water pollution control and governance, promote environmental technology research and development, demonstration, promotion and development of environmental protection industry New formats, new models and new mechanisms - relying on technological research and development and technological innovation to manage the ecological environment has become the basis of the scheme of "top-level design" and the collective consensus of the environmental protection industry. As a national high-tech enterprise, Zhongke Dingshi Environmental Engineering Co., Ltd. (hereinafter referred to as "Zhongke Dingshi") has always taken independent research and development and technological innovation as its foundation. It has a number of core technologies in the field of environmental restoration practice. Starting from August, we have opened the topic of "Key Technology Solutions Series of Core Materials for Environmental Remediation in China Branch" in this column. Each phase focuses on a kind of environmental remediation technology, which includes in-depth interpretation of working principle, process description, key equipment and operation effects . For the first two periods, we have interpreted the ectopic thermal desorption and the desorption technologies of organic contaminated soil, respectively. In this issue, we discuss the relevant knowledge about the chemical oxidation repair technology. In the tripod solid environment repair core technology commentary series three: Chemical oxidation of soil remediation Soil chemical oxidation repair technology is based on the chemical oxidation of drinking water and wastewater treatment methods developed. Strong oxidizers have been used since the 1930s to remove organic pollutants from municipal and industrial wastewaters and also as disinfectants. Subsequent applications for soil and groundwater remediation, both in situ and ectopic, have come a long way in recent years. Technical Principle Chemical oxidation repair technology is the oxidant added to the soil or water environment, the use of oxidants to remove the target pollutants oxidation, thereby eliminating the soil and water pollution of a remediation technology. The technology according to the different repair sites, is divided into in situ chemical oxidation repair technology and ectopic chemical oxidation repair technology. ã€Influencing factors】 Chemical oxidation repair technology will be affected by the soil texture, soil organic matter content, the type and content of pollutants, the presence of pollutants in the soil morphology, oxidant oxidative capacity and other factors. ã€Repair process】 1, in situ chemical oxidation In situ injection of strong oxidants into contaminated soil, the use of strong oxidizing and contaminated soil contaminants chemical reaction, the target pollutants oxidative decomposition, so as to achieve the purpose of remediation of contaminated soil. Commonly used pharmaceutical injection methods are mainly injection wells or injection - extraction cycle, direct injection and injection mixing. 2, ectopic chemical oxidation The contaminated soil is dredged and transported to the chemical oxidation treatment area in the field area, the strong oxidizing agent is added to the contaminated soil, and the soil and the oxidant are fully stirred by the stirring equipment, so that the oxidant and the soil are uniformly and efficiently fused, the utilization is strong Oxidizing and contaminated soil contaminants chemical reaction, so as to achieve the purpose of remediation of contaminated soil. ã€Technical advantages】 Chemical oxidation technology is mature, fast oxidation, short processing cycle, lower repair costs, simple processing technology, and strong operability. The technology rapidly decomposes contaminants, transforming or decomposing pollutants into toxic, migratory or less environmentally-effective forms. In-situ independent research and development of the company in situ chemical oxidation repair equipment can be achieved at the same time deeper mixing and injection; repair process from the soil texture and the influence of a large range of spray agent; have a high cutting, stirring capacity can be achieved Rapid drilling of hard formations; efficient integration of soil and chemicals. ã€applicability】 This technology is suitable for a wide range of applications and can effectively treat chlorinated solvents such as trichlorethylene (TCE) and tetrachlorethylene (PCE) in soil and groundwater as well as benzene compounds such as benzene, toluene, ethylbenzene and xylene (BTEX). ã€Repair Case】 In the restoration case of a contaminated land in Zhejiang Province, the main pollutant was benzene. The company used in-situ oxidation technology to repair and treat benzene-contaminated soils. After being repaired in batches, the company polluted the soil for acceptance Pass rate of 100%. In a case of restoration of a chemical plant in Jiangsu, contaminated soil in the site was contaminated with organic substances such as benzene and chlorobenzene, among which the contaminated soil was dominated by backfill soil, clay and silty clay. Zhongke Ding technical staff in the process of site repair using in situ chemical oxidation repair process (injection well process and injection mixing process) to its treatment, the soil after the benzene and chlorobenzene contaminant content passed the acceptance monitor. ã€Conclusion】 Chemically oxidative repair is one of the most popular repair techniques nowadays due to its ability to reduce pollutants in large quantities over a short period of time. In the future, theoretical research and R & D in the field of technology will continue to focus on the following aspects: 1) developing new oxidants that are easier to handle and safer; 2) developing new types of catalysts; and 3) developing new oxidant delivery methods The purpose of which is to effectively diffuse the oxidant in the poorly permeable soils and also enable the catalyst or activator to perform its supporting role in time in the target remediation area; 4) to carry out joint remediation of various technologies, one is to use other technologies After pretreatment, the site is suitable for adopting chemical oxidation technology, and secondly, the chemical oxidation preconditioning is suitable for adopting other technologies. ã€Afterword】 On the "chemical oxidation of soil remediation technology," we first introduce here. The next meeting, "Zhongke solid core environmental technology solutions," series will bring us on the soil stabilization of curing technology interpretation, stay tuned! Cobalt-based alloy powders are commonly used in laser cladding processes due to their excellent wear resistance, high temperature strength, and corrosion resistance. These alloys typically contain varying amounts of cobalt, chromium, tungsten, and nickel, among other elements, to achieve specific properties. Cobalt 12 Alloy Powder,Cobalt 21 Alloy Powder,Cobalt 6 Alloy Powder,Cobalt Laser Cladding Powder Luoyang Golden Egret Geotools Co., Ltd , https://www.xtclasercladding.com
The laser cladding process involves melting the cobalt-based alloy powder using a high-energy laser beam and depositing it onto a substrate to form a protective coating. This coating helps to enhance the surface properties of the substrate, such as hardness, wear resistance, and corrosion resistance.