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JFE steel production in laser technologies for environmental protection (5) |
| Add time:2007-10-26 Hits:643 |
JFE Steel Corp. committed to the recovery of the three basic principles: (1) reduce the by-product formation (2) in the production of the greatest possible use of resources can be recovered (3) through cooperation with other industries, as a by-product of resources for other industries to use.
(1) to enhance the production of iron and steel recycling
1) Dust recycling
dust recycling, including the use of sintering process has been recovered ferrous powder. JFE Steel Corp. has developed a smelting reduction process to the end, as the use of technology to deal with the recovery of chromium-containing stainless steel and nickel dust, they will be separated for secondary use. Heat Cyclones system is to reduce the production of stainless steel in the process of the dust generated by the converter. In these dust, the particles are relatively large, in the converter was at the top of the collection, and in its high-temperature, high converter, on the return. This technology will not only reduce the amount of dust generated 25%, but also to avoid the dust of the traditional process. Not because of dust, but also conducive to energy conservation.
To recycle other types of iron dust, JFE Steel Corp. has developed in the use of hot metal pretreatment iron oxide dust technology (using iron oxide desiliconization) and the use of iron in the steelmaking dust Technology (effective use of iron). Evidently, JFE Steel Corp. already has the dust recycling technologies.
2) the use of slag cement
(a) reduction in the electroplating wastewater sludge residue. JFE Steel Corp. has been developed to reduce Sludge generated technology, and practical applications of the technology to production. In the process of electroplating wastewater treatment, JFE Steel Corp. by precipitation / separation approach to wastewater is neutral and will be dissolved metals in the form of solid hydroxide precipitates out (Sludge). Because of this Sludge is highly hydrophilic, using traditional technology, that is, use great pressure, it will reduce about 75% of the water, the solid Bian Sludge-four times. Compared to this, and use new methods to change the nature of the Sludge, water, as dehydration after a decrease of about 50 per cent, thereby Sludge than traditional methods generated a 50 per cent reduction.
(B) Sludge for hot metal pretreatment. Sludge Although it is difficult to use as a raw material, but JFE Steel Corp. to develop a recycling Sludge Technology. As the stainless steel plate produced in the process of rolling out Sludge it contains chromium, and direct it to the blast furnace carbon steel raw materials will affect the production and use of raw materials, as a result, Sludge has certain limitations. At the same time, Sludge fine particles in particular, the proliferation of easy, it is difficult to use, in the converter. JFE Steel Corp. has developed a technology to solve this problem. Is in the process of hot metal pretreatment of stainless steel as raw materials Sludge Sludge re-use. Pretreatment of hot metal in the blast furnace and converter between the production of raw materials as stainless steel, carbon steel Sludge does not have the limitations of the production, and because of powder is sprayed into the molten iron in to, so dispersion is not the problem. In addition, the decision to dump the ingredients of slag it is effective additives.
(2) with the community and other industry cooperation in the use of recycling resources
steel production process as a lot of resources recycling potential, iron and steel plant and the community, and other industries for mutual cooperation between the recycling use of resources, tap potentials and important. From the recycling of waste plastics, JFE Steel Corp. of recycling technology to re-use waste from the various community has played a significant role. JFE Steel Corp. will be a semiconductor manufacturing enterprises in the application of mixed waste acid pickling of stainless steel production line. 2
future goals
As noted above, JFE Steel Corp. implemented a zero emissions measures, and has always maintained a high standard of the emissions records. However, with the enhancement of recovery resources, many problems have emerged, such as: recycling resources may affect the normal component of steel production (such as Cl, Zn elements will affect the normal operation of BF); There is the cost of recycling far far more than the price of raw materials; recovery itself increased burden on the environment, such as the increase in energy consumption. Therefore, in the future, to build a recycling and reuse-oriented society, it needs to change its production process and technology development in order to achieve balanced recycling and energy consumption by these two aspects. With this in mind, JFE Steel Corp. is in the process of technology development, including: (1) research and development will produce stainless steel pickling process the waste acid, as a pickling further by addressing the use of the additive technology, (2) because of Zn Elements of raw materials not conducive to the normal operation of blast furnace, its content should be certain restrictions. Hi-QIP-hearth furnace to the research results is a treatment being developed by the Zn dust and slag containing the steelmaking process. In future, JFE Steel Corp. will continue to work with the local community and other industrial cooperation, the development of the iron and steel production for the recycling and reuse technology. |
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