The mineral composition of the Qidashan iron ore in Anshan Iron and Steel Co., Ltd. is relatively simple, with pseudo-hematite, magnetite and quartz as the main minerals, and other mineral components are less. Qi Dashan Iron Ore Dressing Plant adopts stage grinding-rough subdivision-re-selection-magnetic separation-anion reverse flotation process, in which one section of grinding-0.074mm accounts for 60%, and the second section of grinding-0.074mm accounts for 85%. The ore of the powder ore bin is fed into a closed-circuit grinding consisting of a ball mill and a hydrocyclone, and the graded grit is returned to a section of the grinding machine, and the graded overflow is fed into the coarse subdivided cyclone to be classified into two materials. The coarse-grained material is fed into the re-election operation, and finally the re-elected concentrate is produced; the fine-grained material enters the magnetic separation operation composed of weak magnetic separation-high gradient and strong magnetic separation, and the primary mud and the secondary mud in the grinding product are taken off. . The mixed concentrate obtained by the magnetic separation operation is fed to the flotation for anion reverse flotation. The operation is a coarse and a fine three sweep, the collector is LKY, and the inhibitor is carboxymethyl starch. The fine-grained material contains 29% of iron grade. Through the weak magnetic-strong magnetic-reverse flotation combined process, 67% iron concentrate grade can be obtained, and the re-election concentrate and maglev concentrate are combined to become the final concentrate. In 2007, the production index of Qidashan Concentration Plant was: 28.26% of the original ore grade, 67.60% of the concentrate grade, 9.74% of the tailings grade, and the recovery rate of 82.73%.
Tubing is mainly used to provide oil and gas flow passage during production of oil and gas wells. For flowing wells, due to the large inner diameter of the CASING, the casing is directly used for production. Due to the density difference, pressure drop and expansion, the liquid flows up rapidly, causing the liquid to slip, resulting in the ineffective utilization of the downhole elastic energy. Running tubing with smaller OD and ID during production can effectively solve the above problems by allowing fluid to flow in the tubing. Therefore, running tubing is required during production of flowing wells. The downhole operation and production of flowing well and non flowing well can be completed by using various tools for tubing running.
The basic requirements of the tubing used for workover are: to comply with the safety and economic principles, to meet the technical requirements adopted during well completion, and to meet the requirements for corrosion resistance and operation measures after the well is put into production.
According to the manufacturing process, oil pipes can be divided into seamless pipes and electric welded pipes. Seamless pipe is a kind of forged steel pipe without welding seam, which is made of hot working steel. After pressing, stretching, heat treatment and other processes, it reaches the standard size of oil pipe, forming a seamless oil pipe series. Electric welding pipe is a kind of pipe with a longitudinal weld formed by resistance welding or electric induction welding without filler metal. The welding edges are squeezed together by mechanical pressure, and the standard size oil pipes are reached through heat treatment and other processes, forming a series of electric welding pipes.
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