Alkali pulping and paper-making enterprises in the process of alkali recovery "white mud" was originally a waste, easy to cause secondary pollution to the environment. Through nearly 10 years of hard work, Chinese scientists and technicians have successfully developed a new technology for the recovery of calcium carbonate by using alkali-recovered white mud for the filling of paper sheets. This has completely solved the problem of long-term problems with alkaline recovery of white mud in alkaline pulping and papermaking enterprises. . Recently, this technology passed the expert appraisal organized by the Environmental Science Society of the State Environmental Protection Administration.
Wang Meilin, deputy general manager of the technology developer Beijing Watermark Environmental Protection Technology Co., Ltd., told reporters that this innovative technology fundamentally avoided the generation of waste slag by improving the key technologies in the traditional caustic recovery causticization process. At the same time as the recovery of alkali production of another important chemical raw materials necessary for paper--precipitated calcium carbonate.
Up to now, the first phase of the white mud-refined calcium carbonate project of Shandong MCC Yinhe Paper Industry Co., Ltd., which was built by the company, has been operating for nearly one year, and its use is normal. The project has invested about 10 million yuan, and treats about 10,000 tons of white mud per year. The processed white mud replaces the purchased calcium carbonate for paper sheets, which can create more than 3 million yuan in direct economic benefits for the company each year. During the same period, the Baihe Sewage Treatment Project of Henan Xinxiang New Asia Paper Group, which is under construction, has an annual treatment capacity of 20,000 tons. It was completed and accepted in March 2007. It is stable in operation and normal in use, which not only reduces the amount of cultivated land occupied by landfilled by white mud. Eliminate the local white mud pollution, the treated white mud has also completely replaced the purchased talcum powder, and can create more than 4 million yuan in direct economic benefits for the company each year.
According to the State's “Eleventh Five-Year†policy on energy conservation and emission reduction that encourages environmental protection industries, the technology has now been supported by a national “green loanâ€, that is, the relevant investment finance company will carry out special projects for paper-making companies that do not have funds to solve the problem of white mud pollution. Investment, to solve the capital problem for the paper-making enterprises, paper-making companies can use the technology to obtain returns before repaying the loan.
The principle of metal spinning process is to cover the processed metal blank (tube blank) on the mandrel, while the blank is pressed at the end of the mandrel by the tail, and rotates with the mandrel along the spindle, and the rotary wheel moves along the mandrel.
Generally speaking, light automatic spinning machines have structural advantages similar to ordinary lathes. However, in order to meet the requirements of the above spinning process, large spinning machines usually have the following 11 core advantages.
1. The automatic spinning machine bed, main shaft, and transmission system, rotating wheel frame, tailstock and other parts should have sufficient rigidity, and also have a heavier worktable, a thicker guide rail, and a thick wall bearing support And cabinets.
2. The horizontal and longitudinal feed mechanisms of the rotary frame are mostly driven by hydraulic transmission or a combination of mechanical and hydraulic pressure to generate sufficient spinning pressure and balance step-less speed regulation to meet process requirements.
3. Ordinary automatic spinning machines usually use one rotary wheel, but there are multiple auxiliary forming wheels (flanging wheel, curling wheel, etc.). The number of rotating wheels or rotating frame of the powerful automatic spinning machine is 2 to 3 (the general type is 2, and the cylindrical part spinning machine is mostly 2 to 3), and is symmetrical to the spindle axis. Balancing the radial force during spinning, reducing the bending deflection, deflection, and vibration of the spindle and core mold provides a prerequisite for improving the accuracy of spinning parts. This correspondingly requires the rotary wheel to have a higher horizontal (such as a special spinning machine for cylindrical parts) or a longitudinal (such as a general-purpose automatic spinning machine) synchronous feed accuracy. However, a rotary wheel is used for the light and powerful automatic spinning machine.
4. The main shaft has sufficient transmission torque and power. According to the specific process requirements, it can meet the constant torque or constant power adjustment. In addition, it is best to make the spindle speed and the longitudinal feed speed of the rotary wheel steplessly adjustable. On the one hand, it can meet the arbitrary selection requirements of the spinning process; on the other hand, it can maintain the surface rotation speed of the core mold during the spinning process. Possibility of constant feed per revolution.
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