Document yrd2E7aLDzoj1QGX3rK88D15r

I Steel Mill Produces Division Research & Development Deot. Occoher 1973 Non-Asbestos Profax (a) Plant Run EP-5465 (asbestos and paper free) recipe Is used under regular basis for Armeo-Ashland and Middletown, U.S.S.-Fairless and Great Lakes Steel. No major technical problems were experienced during Che month. The excessive foam forming was attributed to the nlsfornulation of the recipe on the pulper platform. Meantime, Armco-Ashland complained about excessive dust experienced with EP-5465. Both problems were corroborated and the recipe was changed by lowering X35S0 content from 0.2Z to 0.15Z. The dust problem is not solved com pletely but there is a noticeable Improvement. No excessive foam formation has been experienced since. Asain, the accuracy of the recipe is dubious. The key row materials arc not weighed and sometime the paper bags of RM-131D, X179Q, X3562 and 74C are thrown in. (b) Plant Experiments During September 1973, we tried to use EP-S465 on Mark IV machine for Profax rings. The experiment was a failure, because: -- Too much X3580 caused an excessive foam formation, or --- The holding tank'* blade speed being too high (--40 rpm) caused an excessive foam formation. --- The introduction procedure of X3S80 into the slurry was changed. I The usage of EP-5465 recipe on Mark IV machine was abandoned for the cine being due to higher priority of Seal-On ring recipe. 1744 73 Mr `SW Steel Mill Produces i . .sion Research & Development Depe. Page 2 ----- Due to RM-447 shortage, we cried the usage of X3211 for three consecutive days on the first shift. No technical problems were experienced. * The best replacement ratio was found to be 1:1.4 <447: X3211). Non-Asbestos Proflex During the month a Proflex (boards and tops) recipe marked XS-1563 was developed. The lab tests are similar to 03 recipe except Anitcc values. The net heat loss after 60 minutes is as high as 3050 3tu/ft2 vs. 7000 3c\i/t2 for 03. XS-1563 is less compressible chan G-3 and is ac least as flexible. We cannot evaluate Che surface roughness. We intend to schedule an experi mental run during November. Non-Asbestos Non-Silica Profax Two steps for a complete elimination (substitution) of silica were con sidered. -- Crystallized silica -- Amorphous silica During October 1973, the recipe XS-1561 was developed and contains no crystallized silica. Various raw materials were tried as replacement for silica flour as: Olivine, Mullite.Kyanite, Zircon sand. Aluminum oxide. The basic recipe employed was EP-5465. The best results were obtained by using RM21. The other mixes melted at 1400*C. The experimental data: -- transverse strength -- density ..................... -- Net heat trans......... -- Rate heat trans.... 250 p.s.i. (17.6 Kn/cm ) 0.69 r./cc. 7700 Btu/ft2 122 Btu/ft^/min. A version of XS-1561 vss written without any silica. The experiswntsl data: -- transverse strength............................................................. 226 p.s.i. (15.9 Kg/cm2) --- density ......................................................................................... 0.63 <*./cc. Both recipes are ready to be used in production under experimental basis. However, the raw material cost (calculated) is 69Z higher than EP-5465. 1745