According to Wu Xiyan, chairman of the China Phosphate Fertilizer Association, the comprehensive utilization of phosphogypsum in China began in the early 1990s. For more than a decade, with the rapid development of high-concentration phosphate and compound fertilizer in China, many companies have paid more attention to the comprehensive utilization of phosphogypsum. In 1990, Shandong Lubei Group built a set of 30,000 tons of ammonium phosphate - 40,000 tons of sulfuric acid - 60,000 tons of cement project, and later built 300,000 tons of ammonium phosphate - 400,000 tons of sulfuric acid - 600,000 tons of cement project. This is the world's largest industrial plant for the production of co-production of sulphophosphoric acid and cement. This device not only consumes all of the company's phosphogypsum, but also requires a portion of phosphogypsum from nearby companies to supplement it. For more than a decade, Tonghua Group has used a variety of calcining devices to produce β-semi-hydrated gypsum, namely building gypsum, cement retarder and other products. Huasheng Co., Ltd. cooperates with Shandong Taihe Group to produce gypsum plasterboard. The products sell well in the northeast region and also produce cement retarder. The two companies, Guizhou Hongfu and Kaifeng Phosphorus, use phosphogypsum to produce cement retarders, gypsum blocks, gypsum bricks and fills in mine gobs. At present, Hongfu, Kaifeng and Lubei have been listed as the national circular economy pilot units by the National Development and Reform Commission and the State Environmental Protection Administration.
It is also known that the best comprehensive utilization of phosphogypsum in the world is Japan. Japan's natural gypsum has very little reserves and is of poor quality, so the enthusiasm for using the by-product phosphogypsum is high. As early as 1931, Nissan Chemical Co., Ltd. first used gypsum board made of phosphogypsum, and in 1956 it started to use it as a cement retarder. Phosphogypsum produced by wet production of phosphoric acid is used in Japan. There is a phosphate fertilizer plant in Belgium, and most of the phosphogypsum is used; Finland uses some of Kaimira phosphogypsum to produce wood fiber gypsum board; Britain, France and other countries also do a lot of work in the use of phosphogypsum to produce new building materials. Major phosphate producers in the United States, Morocco, Tunisia, and Jordan have high levels of radioactive phosphogypsum, most of which are stored and disposed of, while Egypt and other countries directly discharge it into the sea.
Tower Crane gear mainly including 19/38/99 teeth gear, bevel gear, Tower Crane Sun Gear, and so on, which are the critical parts of the tower crane reducer. 19 teeth gear and 38 teeth gear are connected with two motor shaft repectively, which are connected with 99 teeth gear. The speed is reduced by the transmission of gears.
A bevel gear is a type of gear that has teeth cut on a conical surface. It is commonly used in tower cranes to transmit power between the vertical and horizontal shafts.
In a tower crane, the bevel gear is typically used to change the direction of rotation. The vertical shaft, which is connected to the motor, rotates vertically, while the horizontal shaft, which is connected to the crane's boom, rotates horizontally.
The bevel gear consists of two gears with intersecting axes. The teeth on the gears are cut at an angle, allowing them to mesh smoothly and transmit power. The gear ratio of the bevel gear determines the speed and torque of the rotation.
The bevel gear in a tower crane is designed to withstand heavy loads and provide efficient power transmission. It is usually made of high-strength steel to ensure durability and reliability in demanding crane operations.
Overall, the bevel gear plays a crucial role in the functioning of a tower crane by enabling the transfer of power and changing the direction of rotation between the vertical and horizontal shafts.
Bevel Gear,Tower Crane Sun Gear,Crane Pinion Gear,Tower Crane Transmission Gear,Tower Crane Drive Shaft
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