Non-ferrous Metal Scraps Research Articles

磁性流体による比重選別について

Magnetic fluids are very stable colloid suspensions of ultrafine magnetic particles, usually magnetite, covered by surface active agent. A nonmagnetic body placed in the magnetic field under a magnetic field gradient experiences a force which expels the body towards a minimum point of magnetic fluid. This principle can be applied to mutual separation of nonmagnetic materials which could not be separated by using conventional sink and float separation system.Many application can be thought by using this separation system. Especially the problems in recycling metal scraps have recently increased importance and it is considered to be very useful to separate. nonferrous metal scraps each other. The equipments have been developed by using water based magnetic fluid which can be regenerated easily plus permanent magnets with yoke as magnetic field generator which are lower in price than electro-magnet. This separation system is about to be put into practical application nowadays, as the cost of water based magnetic fluid is decreasing.

Importance of Salvage to the War Effort

war effort has entered a new phase that demands wholly new concepts of action. The unprecedented requirement which this change puts upon war industries to produce fighting equipment for full scale action this year means an unprecedented consumption of materials and an imminent crisis in their supply. Every classification of industry, every plant executive, is confronted with an imperative appeal to salvage more iron and steel scrap, more nonferrous metal scrap, more rubber, more cotton and wool waste more of all the materials needed to make fighting tools. As an introduction to the important subject of industrial salvage, a few facts and figures covering the need for raw materials and scrap by the industries engaged in producing war supplies should be reviewed. For the manufacture of the implements of war planes, tanks, ships and guns enormous supplies of metals are required. The Victory program designed by the War Production Board means a continuing and increasing drain on raw materials, which must be supplemented in every way possible. Last year the nation produced some 80-odd million tons of steel. Only a quarter of this was for war and lend-lease use. This year the need is for more than 90 million tons. War needs for copper between now and the end of 1942 are estimated to be five million tons. Regular normal sources of supply will provide about three million. The only way to solve this whole production problem is to get into the flow all the scrap out of which raw materials can be produced. The critical materials most urgently needed today are iron and steel scrap and non-ferrous metals, such as aluminum, copper, brass, zinc, and manila rope, rubber, burlap, wraste paper and cotton and woolen rags.