The recovery rate of refined magnesium in the production of magnesium metal is about 94%, that is, the content of magnesium in the refined slag is about 6% of the amount of magnesium produced, and the recovery rate of refining for crystallized and small crystalline magnesium. Only about 80%, the magnesium content in the refining slag is as high as 20%. If the magnesium refining slag with high magnesium content is not used well, it is not only a waste of resources, but also brings us a living environment. Serious destruction. How to use refining slag has become a matter of great concern to the industry.

From the beginning of smelting and casting magnesium alloy materials, Taiwan MACH Technology Co., Ltd. has been seeking "the method of reducing the emission of magnesium alloy refining slag" and finally succeeded in "reacting the reaction process by using citric acid wastewater and refining slag produced by smelting magnesium metal and magnesium alloy. Hydrogen", after more than two years of repeated experiments - using citric acid or its intermediates and magnesium and magnesium alloy refining slag to react, reducing OH- in acid to H2, about 100-200 per 1 kg of refining slag Lit hydrogen. This combination of different industrial wastes and innovative energy, to achieve production, recycling, and simultaneous environmental protection "three wins".