Investigation on the Water Index Stability in Direct Reduced Iron (DRI) Plant-ARFA Iron and Steel Company

Stability and corrosion indices can be used to study the physical and chemical properties of water consumption in industry. in this study, the results of monitoring the machinery and process water distribution circuits in the arfa dri plant by using langelier saturation, aggressiveness, ryznar and, puckorius scaling indices along with corrosion coupon data are investigated. all of data was taken about 10 months. also all samples examined based on standard methods and indices were calculated by equations presented in literature. the results of langelier saturation and aggressiveness indices showed that there is a slight sedimentation tendency in the process and a slight corrosion leaning in the machinery water circuits. existence of minor corrosion in the machinery water circuit is crucial to avoid the possibility of scale formation on the lobes of compressors as a very expensive important equipment. the calculated indices of the process water showed slight leaning to sedimentation of dissolved solids therefore it is treated for inhibiting scale formation. also, the corrosion coupons that were used periodically confirmed the above results.