Due to the presence of toxic compounds, steel making dust (EAFD) is causing environmental pollution especially in ground water cycle. So toxic elements should be stabilized before these dusts are landfilled. In this research work, production of glass and glass ceramic from EAF dust with regard to stabilization of toxic elemnts was investigated. Different amounts of EAF dust was mixed with silica sand, sodium carbonate and calcium oxide and were melted and casted in steel molds. Mixing of these materials were chosen based on ternary diagrams of CaO-MgO-Al 2 O 3 -SiO 2 . Sodium carbonate was added to the mixture in order to reduce the melting temperature of the mixture and increase the viscosity the melt. Appropriate heat treatment were applied to the casted glass to produce glass ceramic. Produced glass-ceramic was investigated from the view of stable compounds, microscopic structure and mechanical properties. By thermal analysis (differential thermal analysis) suitable conditions of heat treatment were determined to get appropriate microscopic structure and mechanical properties. for nucleation of crystalline phases in produced glass, two-stage and single-stage heat treatment were applied. In the first stage of two stage heat treatment, small and stable nucleatio of ceramic crystals are formed in preferred locations. Preferred locations for nucleation of crystalline phase are interfaces or free surfaces. In the second stage of two stage heat treatment, growth of crystal nucleations are occured and in single-stage heat treatment, the nucleation and growth of ceramic crystals are occured simultaneously. Leaching tests were performed to investigate the stability of the compound according to Environmental Protection Agency (EPA) standard. The leaching tests on electric arc furnace dust showed that amount of Zn and Cd exceeded from extent permitted, also the leaching tests on glass and glass ceramic showed that produced glass and glass-ceramic were chemically very stable, and ions emission in solution with pH=5 was about zero. The x-ray diffraction studies on produced glass-ceramics indicated that The dominant phase in most samples was wollastonite. Scaning electron microscopic images taken from the samples of glass ceramic showed that the overall shape of crystals in glass ceramic are dendritic and with increase in amount of dust in the initial mixtures, the crystalline phases increases. By applying heat treatment, hardness of glass ceramics were significantly reduced and their mechanical strength was extremely increased. Produced glasses had average 800 vickers microhardness and after heat treatment its value reduced to 500 vickers and it was observed that with increase in amount of electric arc furnace dust in the initial mixture, the micro-hardness of glass ceramics severely reduced. When 30 wt% EAF dust was used in the initial mixture, glass ceramic with highest mechanical property was obtained. Key words: electric arc furnace dust, heavy metals, glass-ceramic