高度酸化에 의한 필라멘트 製造工程의 心線 溶解 및 몰리브덴 回收

Abstract

In making filament used as light source material, advanced oxidation dissolution method was employed to dissolve mandrel wire used as the center supporter for coil shaped tungsten wire, The process of reusing the treated water generated during this process and that of recovery of molybdenum from the reuse water were studied. The results were as follows. 1. The dissolution of molybdenum was in proportion to the surface of contact of molybdenum and the solution. 2. In the dissolution of molybdenum in hydrogen peroxide/catalyst, the early condition of reaction was 15℃, and it was desirable to be executed in the condition of normal state of 32℃. 3.The results of dissolving mandrel wire in FL type filament and GLS type filament in pilot size were as follows. In the condition of pilot plant, very good quality of products could be produced when using manufactured goods as samples. 4. Dissolving Mo in case of ozone was added in hydrogen peroxide. Mo wire used as the center supporter to make coil typed tungsten wire was to be separated from it. Hydrogen peroxide/catalyst dissolution method was employed to dissolve Mo to decrease the quantity of hydrogen peroxide. Experiments were executed in a reactor with ozone and on ultraviolet lamp. When treated with ozone and ultraviolet, the quantity of hydrogen peroxide would be decreased 30%. 5. Comparison of air pollution matters generated used dissolving process and advanced dissolving process. Mo was dissolved by the used process, NOx, SOx, and O⒬ were generated and polluted air very much. But it was found that when Mo was dissolved by the new process, hydrogen peroxide/catalyst dissolution method, generated gases were in good state. 6. It was noted that with the number of times the recollecting Mo percentage become higher, and in spite of much recollecting, without any large effect on the goods the solving water could be reused as the processing water. Because the collected Mo. holding percentages were more than 76%, it is considered they are very good one than Chinese Mo. ores with 50% degrees of purity, worthy of recollecting Mo. Therefore, we are able to develop a hydrogen peroxide dissolution method, to assure a Mo dissolving technique as clean technology and to draw and make a device for this purpose. The qualities of final products by this hydrogen peroxide dissolution method were proved to be accorded to canon price pretty well, and we were able to secure equipments with automatic control system and technical ability on them, devising the process according to the skills reuse the processing water generated in dissolving process and to recollect high priced Mo from the excessive processing water. the qualities of final products by these skills were accorded to canon price largely. The productivity per hour of hydrogen peroxide dissolution method was improved more than 80% adjusting reaction temperatures. Especially one of the most considerable results is the fact that Mo dissolving industry, which was pollution one, is turned into an ecologic and clean technique industry. With the results developed in this study it is considered to expected it to be a competitive international clean technical business.