Hydrogen is easily absorbed molten aluminum. Unfortunately, the molten aluminum alloy, the hydrogen solubility is substantially greater than the solubility in solid aluminum. When the aluminum alloy solidification, the hydrogen discharged from the melt, shrinkage porosity expand and enlarge the dross recovery, accompanied by the loss of mechanical properties. Hydrogen general charge from wet and humid melting tool, but the main source of hydrogen is moisture in the environment. Because almost difficult to prevent adsorption of hydrogen smelting, it is necessary to remove hydrogen from the melt before pouring. The most commonly used method is to melt into the drum to dry nitrogen or argon bubbles. The use of chlorine to remove hydrogen is particularly effective. However, due to environmental and safety reasons often preclude its use in production. With the right cast reasonable method, it is one of the important conditions to obtain high-quality castings. Practice too, pay attention to the following matters, to prevent, reduce casting defects is very effective. (A) should be carefully checked before pouring the melt temperature furnace, ladle drying capacity level and surface coating layer, the other is in compliance with either preparation tool. Metal pouring cup before pouring in within 3 - 5 minutes in good place on the sand, then ladle pregnant temperatures no higher than 150 degrees, placing premature or excessive temperature, stifling a lot of gas in the runner, in there is a danger of explosion when pouring. (B) can not be in the "awful draft" pouring occasions, and strongly oxidizing melt, burn, the casting defects such as oxidation inclusions. (Iii) acquiring Jiangsu dross recovery melt from the crucible, should be used to underwrite and push the scale or flux layer surface of the melt, slowly melt in the ladle dipped dross recovery, with the ladle wide mouth scooping melt, then smooth lift the ladle. (D) when the end of the package do not palm flat, the pace should be steady, should not be raised too high ladle, ladle the molten metal level must remain stable, not moving rope. (E) is about to cast, should Grilled net ladle slag, in order to avoid casting will slag, scale, etc. into the mold. (Vi) in the casting, the melt flow remains steady Shandong dross recovery, can not be interrupted, not straight into the arms of the bottom outlet opening. Gate pregnant should be filled from beginning to end, the liquid can not flip the casting speed to be controlled properly. Typically, the degree to slightly slower start pouring, the melt filling smooth and slightly faster, and casting speed remained unchanged. (Vii) in the casting process, a ladle from the tip and on the gate as close as possible to not more than 50 mm is limited in order to avoid excessive oxidation of the melt. (VIII) with blockage gate arms, clogging can not allocate too early, after the melt filled the gate arms, then slowly obliquely set aside, in order to avoid eddy currents when the melt injection gate. (IX) of 60 mm below the melt from the bottom of the crucible should not be pouring castings. Dross recycling, Shandong dross recycling, Shengxin scrap metal recycling (certified merchants) recovered from the Linyi City Shengxin scrap metal Limited. Road Zhiyuan, temper forward. Linyi City Shengxin scrap metal recycling Ltd. (shengxin.tz1288.com) aims to become and you win symbiosis, strategic partners to move forward, the more determined to become the most influential of the scrap metal business, and you leap to jointly Success!