Document DGQZ5LLERaGgo7vrwN0kGXwEn

FILE NAME: CERAMICS (CER) DATE: 1945 Sept DOC#: CER034 DOCUMENT DESCRIPTION: Journal Article Abstracts CERAMIC ABSTRACTS and THE BULLETIN OF THE tre*n- -. T r; AMERICAN C E R A M I C terS O C I E T Y fer_- S E P T E M B E R 15, 1 9 4 5 174 Ceramic A bstracts Vo1- 24. No. o Utilization of flue dust. C. S. D a r l in g . Meek. World E n i. Record, 118 (3053] 1-6 (1945).--The utilization of ash from power stations and industrial plants may become im portant in the future because of the tendency to use raw coals with higher ash percentage. Storage and handling systems that can be adapted to handle any quantity of ash are described. The utilization of ash should be under taken only after investigation of the economic aspect, not from the viewpoint of the supplier but from th a t of the user. Particular care must be taken when dealing with subsieve analysis, and various standard sieves are com pared. The thermal conductivity of fly ash is discussed. 9 illustrations. P.G. Ventilation and dust hazard. Anon. Foundry Trade Jour., 76 [1501] 65 (1915).--Dust hazards in Britain are reviewed and compared with some American standards, including those of New York State. A.J.B. W ar veterans in the postwar ceramic industry. J. . E agle. Bull. Amer. Ceram. Soc., 24 [8] 299-92 (1945). SEPARATE PUBLICATIONS Cast Iron in the Chemical and Process Industries. F. L. La Que. Gray Iron Founders' Society, Inc., Wash ington 6, D. C., 1945. 28 pp. Price $1.00.--La Que, head of the Corrosion Engineering Section of the International Nickel Co., Inc., presents extensive data on the corrosion rates of cast iron exposed to the ac.ion of substances com monly handled by chemical structures. Results of labora tory and plant tests with more than 300 corrosive media, in an alphabetical range from acetic acid to zinc sulfate, are shown. The four appended tables also list the many chemicals regularly bandied by cast-iron pumps and valves and those resisted satisfactorily by high-silicon irons. Factors dictating cast irons for corrosive service, the avail ability of the material, design for chemical-industry equip ment, and many specific applications are discussed. Pc inting to the corrosive-service-per-dollar factor, tb : booklet states th at in some applications the nature of the corrosive media is such that, despite a fairly rapid attack on cast iron, no other material can be expected to render long enough service to justify a higher initial cost. Differences in the manner in which cast iron resists corrosion are re lated directly to the structure of the material and partic ularly to the presence of graphite flakes in a ferritic, pearlitic, or austenitic matrix. The corrosion-resisting char acteristics of gray iron may be altered by alloying and by foundry techniques, since both affect the size, shape, and distribution of the graphite particles and influence the cor rodibility of the matrix. Health of Workers in Dusty Trades: VH, Restudy of a Group of Granite Workers. A. E . R ussell. V. S. Pub. Health Bull., No. 269,71 pp. (1941). Price 15c from Supt. of Documents, Washington, D. C.--The original study of Vermont granite workers was completed in 1926 and re ported in ibid., No. 1S7, which has become one of the class ics of silicosis study. In 1937-1938,116 out of the original 642 workers were re-examined, and the results are reported. A few were also re-examined in 1931. Two or three X rays of each of 19 characteristic cases are presented, and the progress of the disease can be easily followed. Tables show the progress of silicosis (a) in granite cutters who con tinued at their occupation, (6) in those who changed to non dusty occupations, and (c) in those exposed to 20 million particles of granite dust per cubic foot or less. In group a, the disease made moderate progress in 31 out of 64 workers and marked progress in an additional 31, while 30 bad tuberculous complications. In group b, 6 out of 18 made moderate progress and 8 out of 18 marked progress, with 9 cases of tuberculosis complications. In group e, moder ate progress was made in 2 cases out of 33, and there was one case of tuberculosis, in a subject who was not silicotic. Those who serve longest are most subject to change in diag nosis to the more advanced sages of the disease. Most workers who bad been exposed to 40 to 60 m.p.c.f. over a period of years had silicosis, whether they changed occupa tion or not. Those similarly exposed to about 6 m.p.c.f. were practically free from silicosis. In the remaini-g group (those exposed to an average of 20 ra.p.cj) etiology of silicosis is doubtful, and it appears that a uj limit lies somewhere between 9 and 20 million pan These figures apply only to granite containing 31 to awfree silica. The figures published by the National Siliclv Conference are given for comparison, the p e rm iaS maximum safe concentrations varying from 4.5 mT ~7 for South Africa dust, 80% free silica, to 50 m .pcj | Pennsylvania mines with 5% free silica. Suitable vcntilT tion and medical supervision are recommended. F.S M Binder for core sand of waste sulfite lye. Chembch, Werjce (Albert A. Greth and Karl Bruckel, inventors Ger. 741,652, Nov. 15, 1943 (March 24. 1942); cl. 31, abstracted in Chem. Zentr., 1944, I (16 ] 958 --The binder consists of mixtures of waste sulfite lye with hardenbk phenol- and/or amino-condensation resins. The cores are both very strong and waterproof. M Ha Binders of waste sulfite lye for foundry molds and core. F. Raschig Gh .b.H. (Karl Thdnnessen, invent Ger. 743.092, Dec. 17. 1943 (March 20, 1942); cl. 3lr; abstracted in Chem. Zentr., 1944, I (16] 95S --Urea a added to the binder, preferably in amounts of 0 to 15(1 The sand cores made with this binder have a high drr strength even without additions of oil or residue of oil <ar fat distillation. M.Ha. Cyclic organosilicon compounds. W. I. Patnode avt R. W. S chiessler (General Electric Co.). U. S 2.3S1.CU2. Aug. 7, 1945 (March 4, 1942). 4 claims. Cl. 2C0-G07.-- 1. A silicon compound having the formula (CLSiCHr, wherein x is equal to a t least 3. Halogenated organosilicon compounds. W. I. Pat- node and R. W. Schiessler (General Electric Co.). U. S. 2,381,000, Aug. 7, 1945 (March 4, 1942). S cUins Cl. 260-607.--1. An organosilicon compound harag the formula A'Si(CHj).SLVtK, where X represents a hi) gen atom, Y represents an atom selected from the group consisting of hydrogen and a halogen atom of the saar type as th a t represented by X , and n is an integer and isat least 1 and not more than 4. Making terra cotta, ceramics, and porcelain imper meable. G iovanni M auri. Swiss 225,956, May 1L 1943 (June 8, 1942); abstracted in Chem. Zentr., 1944,0 (1/2] 63.--The porous objects are dipped into moltea sulfur a t 125*C., quickly heated in it to 180*. and thea quenched in cold water. To the molten sulfur, neutnj substances or coloring m atter can be added, e g., alum*** or bronze powder or graphite. M.Ha. ^ Manufacture of plastic masses for foundry eores, *~ F erdinand C. W eipert (Soc.). Belg. 449,117, No*-* 1943 (Feb. 9, 1943); abstracted in Chem. Zentr^ !* - I (25/26] 1422.--Quartz sand (100 kg.) is mixed with 4* magnesite and 6 kg. MgCI> lye. - - - - - -- M-H* . E. G. Room . * * 1 U l l l l V 4 * " ,, . method of preparing organosilicon halides prises effecting reaction between silicon and a hydrocan*"^ halide. cnaa; Preparation of organosilicon halides. M. M- = " 7 ' and W. F. G illiam (General Electric Co.). U. S 999, Aug. 7, 1945 (March 4, 1942). 9 claims. C L jrT j 607.--1. The method which comprises effecting - a t an elevated temperature between silicon anc rj genated hydrocarbon in the presence of an inert f * Refractory mold. P. F. Collins (Austenal " * ^ ^ tories, Inc.). U. S. 2.380,945, Aug. 7,1945 (July 6 claims. Cl. 22-188.--1. A plastic mix for," " 'f&g,~ refractory mold, the mix comprising a refract^) . and a binder comprising a noninflammable d in its original condition and prior to mixing . the refractory filler contains inorganic silica J0"5 . ,, e ^ all of which Is present as silica in the form of sol with a relatively small amount of alkali-111' X l pound.