China Drying Network News At present, most yellow phosphorus companies in China are struggling with the use of high-energy-consuming and polluting electric furnaces to produce yellow phosphorus. How can we completely change this situation, so that the yellow phosphorus industry in the production of energy-saving emission reduction, the use of resources is fully reasonable and further reduce production costs, which is the yellow phosphorus industry's goal of hard pursuit. Kunming Longqing Chemical Co., Ltd. of Yunnan Province has long-explored and developed the kiln-based yellow phosphorus technology, which has brought hope for the yellow phosphorus enterprises to get out of difficulties. Judging from the results of the current pilot test of this technology, kiln-based yellow phosphorus is a new technology worth paying attention to in terms of feasibility, economic benefits, and energy consumption. China's low-grade phosphate rock reserves are huge, because it contains a lot of impurities, using conventional dihydrate process is difficult to obtain high-quality phosphoric acid. In recent years, China's phosphorus chemical industry has made considerable progress. However, whether it is producing phosphoric acid and high-concentration compound fertilizer by wet process or producing yellow phosphorus and deep-processed products by thermal process, a large amount of high-grade phosphate ore is required, which is inconsistent with our country. The current situation of phosphate resources, the depletion of phosphate resources has severely restricted the development of phosphorus chemical industry. Therefore, whether it is from the use of phosphate rock or the analysis of economic benefits, the development of new technologies and new technologies for the production of yellow phosphorus and phosphoric acid is an urgent requirement for the sound development of China's phosphorus chemical industry. In view of the current status of phosphate rock resources, there are many domestic and foreign research and trials that are based on kiln technology. Whether kiln-method phosphorus or kiln-process phosphoric acid, the common denominator is that no electricity or sulfur is used. Low-grade phosphate rock is used as the raw material. The final product is yellow phosphorus or high-quality phosphoric acid. In fact, as early as the middle and late 1980s, Chinese researchers began to conduct in-depth research on kiln-process phosphoric acid technology and proposed two different kiln-process phosphoric acid production lines for rotary kiln and tunnel kiln. The rotary kiln method phosphoric acid technology was proposed by the Changsha Institute of Mining and Metallurgy of the former Ministry of Metallurgy in 1988. They combined the cold solid pellets used in the metallurgical industry and the direct reduction rotary kiln technology with the characteristics of phosphate rock resources and proposed a new one. Phosphoric acid preparation process - CDK kiln process phosphoric acid new process. The process greatly reduces the mass transfer requirements on the reactor, only requires the reduction temperature, and ensures that the outside of the pellet is a neutral or reducing atmosphere, and the reduction of phosphorus can be accomplished in any simple reactor. The tunnel kiln process phosphoric acid technology uses a phosphate kiln reduction reactor to use a tunnel kiln. The calcination temperature is between 1280° C. and 1300° C., and the reduction rate of phosphorus in the process is more than 88%. The basic principle of both kiln methods is to use a tunnel kiln or a rotary kiln as a reduction reactor to directly produce phosphoric acid from phosphate ore. In terms of process technology, there are problems of large phosphorus loss and high costs. In view of the shortcomings of these two kiln-process phosphoric acid technologies, Longqing Chemical Co., Ltd. puts forward a new technological process based on the previous experience: that is, the kiln process phosphoric acid is implemented in two steps. First, the yellow phosphorus is obtained by the kiln process and the kiln is obtained. Phosphorus is produced by phosphoric acid followed by a traditional thermal process. The key to this process is kiln yellow phosphorus. After long-term exploration, Longqing Chemical Co., Ltd., together with other units, jointly developed a new technology for yellow phosphorus in the kiln process. The so-called kiln method of yellow phosphorus is to use the vertical tank of zinc in the metallurgical industry as a reducer to simulate the method of smelting zinc to produce yellow phosphorus. Decades of zinc production practices show that this process is safe, reliable, and stable. The technology first prepares pellets (phosphorus ore, silica, coke, binder) into pellets, and places the pellets in a vertical tank after drying. The gas is used as a fuel to heat the materials in the vertical tank by means of a flame-proof heating method. , Warming, in high temperature conditions, the phosphorus in ore is reduced to elemental phosphorus, the phosphorus vapor is led out of the vertical tank, after the dust removal in the collection of phosphorus in the tower by two spray cooling, to get crude phosphorus, and further refined to get yellow phosphorus. In 2007, Longqing Chemical began lab tests with kiln-based yellow phosphorus. They used high-temperature furnaces as test equipment to obtain basic data on kiln-based yellow phosphorus. On this basis, from 2008 to 2010, Longqing Chemical carried out a pilot plant with a scale of 150 tons/year to verify the process feasibility of the kiln technology from the aspects of technology, raw materials, energy consumption, and exhaust gas utilization. In the process, the kiln-based yellow phosphorus replaces the vertical furnace in the metallurgical industry with the use of an electric furnace for the production of yellow phosphorus. The vertical tank has good sealing properties and can form a good reduction environment. At the same time, the flame-fired heating method using gas as fuel can also achieve the purpose of reducing phosphorus, and the cost of yellow phosphorus will be greatly reduced after coal is replaced. In the choice of raw materials, the kiln-based yellow phosphorus is based on phosphorus ore with a P2O5 content of 18%. The reduction rate is 95%, and the total phosphorus yield is over 80%. After simple treatment, the yellow phosphorus content can reach 99.96%. Quality product quality requirements. In terms of energy consumption, kiln-based yellow phosphorus uses mineralizers to significantly reduce energy consumption. Due to the use of mineralizers, the yellow phosphorus reduction temperature is greatly reduced. According to the variety and amount of mineralizer, the yellow phosphorus reduction temperature can be controlled at 1089 °C ~ 1176 °C, the reduction temperature of the furnace in the 1350 °C ~ 1450 °C, yellow phosphorus reduction temperature drop above 200 °C, energy-saving effect is obvious. In the use of exhaust gas, the yellow phosphorus from the kiln process yellow phosphorus tail gas produced in the production after purification, compression, all mixed with gas, used as a vertical tank heating heating fuel to reduce yellow phosphorus, play an enormous role in energy saving, this is the electrical method Yellow phosphorus technology can't do it. The technical advantages of kiln-based yellow phosphorus are exactly the internal factors that restrict the development of electrical yellow phosphorus. In addition, kiln-based yellow phosphorus is also very cost-effective. After the major technical transformations such as the vertical tank on behalf of the electric furnace, the use of coal for electricity, the development and utilization of mineralizers, and the full recovery of the use of yellow phosphorus tail gas, the cost of the kiln method of yellow phosphorus is only 58% ~ 67% of the electricity yellow phosphorus cost. At present, the kiln yellow phosphorus technology developed by Longqing Chemical has passed the pilot test and obtained the invention patent right, completed the development of major equipment, accumulated a large amount of experimental data, and trained a group of technical talents in the pilot testing process. It laid the foundation for the next industrialization of kiln-based yellow phosphorus. Large-Sized Casting Parts,Ebm 3D Printer Provider,Delicate Metal Castings,Delicate Metal Parts Guangdong Fenghua Zhuoli Technology Co., Ltd , https://www.fhzlcasting.com