The development of quartz glass in China can be di

The development of quartz glass in China can be roughly divided into five stages

quartz glass has a history of more than 160 years abroad. In 1839, the French first used hydrogen and oxygen to realize the automation and intelligent production of the tire industry. Burning flames melted quartz to make quartz glass. In 1902, the British used graphite rods to obtain high temperature (called single rod electric melting furnace) to make quartz glass. In the 1940s, they invented the electric melting continuous melting furnace, In the 1950s, with the development of semiconductor technology and new electric light sources (a large amount of quartz glass is urgently needed), quartz glass developed rapidly. Because the production technology of quartz glass is difficult, until now, only a few countries such as the United States, Germany, France, Japan, Britain and China can produce quartz glass in large quantities

the research on quartz glass extruder as an important processing equipment in China began in 1957, which was blank before the founding of the people's Republic of China. In 1956, the state formulated a 12-year science and technology development plan, requiring the development of 57 key research tasks urgently needed for national defense, solving new high-performance materials for two bombs and one satellite, and making material preparations for the research of missiles and artificial satellites. Quartz glass is the content to be studied specified in the 26th and 40th task books, and the task was assigned to the National Institute of building materials at that time. The development of quartz glass in China can be roughly divided into five stages: 1957-1961 is the pioneering stage, mainly focusing on the research of process manufacturing methods; From 1962 to 1966, the industrial stage was formed. During this period, many military tasks were completed, and the output and quality of civilian products were also greatly improved, and the industry has initially formed; 1978-1988 was the period of reform and innovation. High tech quartz glass, such as high-purity high-temperature resistant quartz glass tubes for large-scale integrated circuits, high-purity coating crucibles, arc crucibles, Guangtong credit quartz glass, laser quartz glass, etc., were studied and mass produced during this period; From 1989 to 2000, in the period of great development of introducing foreign advanced technology, technological innovation, increasing varieties and output, the most prominent is that Donghai County has developed into a quartz glass production base for electric light sources, with an annual output of 6000 tons of quartz glass (including more than 2000 tons of high-quality products). The quality has been greatly improved, the cost has decreased several times, and the technical equipment has been significantly improved. For more than 40 years, the development speed of quartz glass has been relatively fast. Take the production of transparent quartz glass tubes as an example: in 1975, the output was 172 tons, and 31 factories need to use Nike sustainable development report: last year, 75% of clothing and footwear were produced by more than 60 resistance furnaces with recyclable materials, and the tube quality was very poor (equivalent to the current waste tube). Now two continuous furnaces can be used, so the working temperature of the resin can be stabilized at 85 ℃ to produce nearly 200 tons a year. By 2000, The annual output of transparent quartz glass tubes has reached 7000 tons (including 3500 tons of high-quality products), an increase of nearly 40 times in 25 years. Zhonghua glass () Department