摘要:

AbstractA study has been made of the fusion characteristics of feldspar, flint, kaolin, and whiting used in glaze compositions with zine oxide and various opacifiers. The fusion characteristics of tin oxide, Opax, Zircopax, and various combinations of opacifiers are given. All heat‐treatments mentioned are at cone 12. Isoviscosity triaxial diagrams show the fields of good glazes in each series, and the rclative effects of composition changes on the physical properties are outline

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15821.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractAfter insulating firebrick are reheated in service, many of them contract too much and develop large open shrinkage cracks. By first applying to the surfaces a 0.035‐in. coating composed of aluminum and fire clay, these brick usually remain intact and constant in size when they are reheated. The coating also becomes hard, causing the brick to become more resistant to abrasion, slag action, permeability of gases, load at high temperatures, and sudden temperature changes. Coatings composed of 60 to 70% of fire clay and 30 to 40% of aluminum powder were found to overcome most of these deficiencies in insulating firebric

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15822.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

TableOF ContentsI,Introduction. II, Physical Extraction:(1) classifying, (2) calcination, (3) hydration, (4) leaching, (5) flotation, (6) crystallization, and (7) miscellaneous physical methods.III, Chemical Extraction:(1) forming carbonates and formates, (A) carbon dioxide, (B) carbonates, and (C) carbon monoxide; (2) chlorine compounds, (A) chlorine, (B) hydrochloric acid, (C) calcium chloride, (D) magnesium chloride, (E) cyclic process, (F) hydrochloric acid manufacture; (3) nitric acid; (4) sulfur compounds, (A) sulfuric acid, (B) sodium sulfate, (C) sodium bisulfate, (D) calcium sulfate, (E) magnesium sulfate, (F) sulfur dioxide, (G) sulfites, and (H) sulfur, sulfides, hydrogen sulfide; (5) ammonia and ammonium salts; (6) alkalis, (A) calcium hydroxide, and (B) sodium hydroxide; (7) organic compounds, (A) acetic acid, and (B) sugar; (8) sea water, (9) electrochemical methods; (10) ion exchange, (11) miscellaneous chemical methods.IV Miscellaneous. V. Conclusions VI, Bibliography VII, Author Index.

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15823.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY

摘要:

AbstractReactions of sodium carbonate with quartz occur without fusion between 726° and 805°C. When the reactions are conducted in a stream of nitrogen, the size of the charge, composition of the mixture, rate of flow of gas, and duration of reaction have appreciable effect on the reaction rates and on the nature of the product.In presence of sufficient sodium carbonate, the end product of the reaction at the higher temperatures is the orthosilicate. The formation of a series of silicate ions as rntermediate products between the metasilicate and the orthosilicate by interaction of the former with carbonate ions is postulated. This process is considered to be reversible with the smaller silicate ions. This theory, moreover, serves to reconcile several apparent anomalies in the experimental data.The rate of reaction of thc silica particle is not measured by the rate of carbon dioxide evolutio

ISSN:0002-7820    

DOI:10.1111/j.1151-2916.1943.tb15824.x

出版商:Blackwell Publishing Ltd    

年代:1943

数据来源: WILEY