Abstract:
One of the most important problems of the steelmaking industry is the recycling of galvanized steel scrap and the benefit or disposal of the powders produced in the Electric Arc Furnaces (EAFD) and LD / BOF converters. This issue is well-known worldwide. Transportation costs, disposal in appropriate places and increasing environmental demands are making many steel companies in the world look for ways to avoid, minimize and / or treat their powders and particulates correctly. The methodology of the project consists of collecting, sampling, selecting and molding the raw materials involved: powders from electric steelworksor Electric Arc Furnace Dust-EAFD, bentonite-Ben., refractory clay-AR and construction cements. Following that, these materials were characterized partially. Afterwards, heating tests were carried out on mixtures of EAFD and bentonitein, in the form of cylindrical briquettes, using electric ovens to evaluate how preset factors favorably influence the porosity response variable. This experience also provided the proportion in optimal weight of the mixtures. These proportions were used to form test bricks with all the aforementioned raw materials in order to evaluate the effect of their new factors on another variable responses to the resistance towards compression. All these tests were carried out according to experimental planning with the simple factorial method 23 that evaluated the effect of the factors using the COLMEIA software. It can be concluded that: A> B> AB, where the individual synergy of (A) EAFD / Ben. is more influential than the one of (B) Heating temperature. This in turn is more influential than the double synergy (A) EAFD / Ben. and (B) Heating temperature or AB in the porosity of the cylindrical briquettes formed of EAFD and bentonite. During the second run the result of A> AC explains that the individual synergy of (A) EAFD / Ben. is more influential than the dual synergy of (A) EAFD / Ben. and (C) Setting time or AC in the compressive strength of the set of test bricks. This compressive strength was based on electric steel, bentonite, refractory clay and construction cement powders.
Finally, it is concluded that in both experiences, the proportion PAE / Ben. = 7/3 is the optimal mixture and therefore, the factor most influential in the porosity-stabilization and resistance to compression or mechanical strength of the specimens was tested.
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