Detail of "1302-93-8"

Reference

Divided foundry molds

Divided foundry molds. Kovacs, Tibor; Szende, Gyorgy (Gepipari Technologiai Intezet, Hung.). Hung. Teljes HU 27159 O 28 Oct 1983, 12 pp. (Hungarian). (Hungary). CODEN: HUXXBU. CLASS: IC: B22C001-00. APPLICATION: HU 81-3360 10 Nov 1981. DOCUMENT TYPE: Patent CA Section: 56 (Nonferrous Metals and Alloys) Divided (cope and drag) ceramic forms (molds and cores) are made by coating the pattern with a release agent (vaseline or silicone emulsion), then spraying with a homogeneous ceramic slurry to a thickness of 0.2-10 mm, preferably 0.5-3, followed by pouring and compacting conventional molding sand mixts. around the ceramic shell. The pattern is removed after setting, and the inside surface of the ceramic shell is dried, flame-heated, or vacuum-treated. The ceramic slurry contains ground refractory, Et silicate binder, and optionally setting accelerators (MgO). The backup sand mixt. contains water glass as binder, and accelerators such as CO2, 2Ca0.SiO2, cement, gypsum, Na fluorosilicate, ferrosilicon, metallurgical slags, and org. esters. Advantages over the conventional ceramic moldings are the improved surface quality (no gas blowholes caused by improper control of the slurry d. and viscosity), no need of high-temp. oxidizing heat treatment (~800°) requiring addnl. energy consumption, and the automation of the process. Thus, a (2-2.5):1 mixt. of ￡0.2 mm mullite [1302-93-8] and binder soln. (Et silicate 40-70, H2O 4-15, and HCl 0.1-0.8% in org. solvent) was homogenized, and 2-3 MgO/1000 mL binder soln. was added. This slurry was sprayed on a pattern to 1-1.5 mm thick. After setting the ceramic layer in 5-10 min, the flask was filled around the pattern-ceramic layer assembly with a conventional backup sand mixt. of 1-3 mm grog with 4-5% water glass, compacted, and bonded with CO2. After setting of the backup sand, the pattern was removed and the ceramic half shell heated 3 min with a gas flame.

On the application of complex equilibrium calculations to the study of mineral matter during coal combustion

On the application of complex equilibrium calculations to the study of mineral matter during coal combustion. Carling, R. W.; Mar, R. W.; Nagelberg, A. S. (Sandia Natl. Lab., Livermore, CA 94550, USA). Prepr. Pap. - Am. Chem. Soc., Div. Fuel Chem., 28(2), 223-33 (English) 1983. CODEN: ACFPAI. ISSN: 0569-3772. DOCUMENT TYPE: Journal CA Section: 51 (Fossil Fuels, Derivatives, and Related Products) The thermochem. behavior of mineral matter in combustion (at 1000-2000 K) of a pulverized semianthracite coal is discussed through thermodn. equil. calcns. related to the formation of ash and gaseous species.Several substances with their cas registry numbers 7429-90-5 and 20768-67-6 may be metioned in this study. Special attention was addressed to the impact on the calcns. of 3 potential sources of error; errors in the thermodn. data, selection of species for the calcns., and soln. formation. The Na-contg. species expected to form in the gas phase were NaCl, NaOH, and Na, and, in lesser concns., Na2SO4 with a max. at 1400 K. The principal condensed-phase species was SiO2 at all temps., with 2 mol.% Na2SO4 as the only other species at <1400 K. The sulfate was replaced by Na silicate [13870-28-5] at >1400 K. The consideration of Al compds. in the calcn. altered the results significantly. The Al-contg. species were Al, AlO, Al2O, AlOH, and Al2Cl6 as fly ash in the gas phase and Al2O3, mullite [1302-93-8], NaAlO2, kaolinite, jadeite [12003-54-2], pyrophyllite [12269-78-2], kyanite [1302-76-7], and albite [12244-10-9] in the solid phase as bottom ash. .