Showing papers on "Fly ash published in 1968"

Method and composition for cementing oil well casing

Abstract: 1,241,886. Cement compositions. DRESSER INDUSTRIES Inc. 5 May, 1969 [28 June, 1968], No. 22792/69. Heading C1H. [Also in Division E1]. A composition comprises cement and powdered Na 2 Siez glass (defined) of a Na 2 O/SiO 2 ratio 1:1A6: : 1:4A5 in a weight ratio of 6:1 : : 1:1. Optionals are Ca(OH) 2 , LiOH, Li 2 CO 3 , LiCl, NaOH and Na 2 CO 3 and up to 25% pozzuolana, e.g. volcanic ash, fly ash and some clays. Cement includes lime and pozzuolanic, high alumina, grappier and portland cements. The compositions are added to drilling fluids containing dispersants e.g. lignites (humates), tannates and lignosulphonates to give mud concretes.

Recent Electrostatic Precipitator Experience with Ammonia Conditioning of Power Boiler Flue Gases

Abstract: Motivated by heightened recent interest, Koppers Co. has been experimenting with ammonia conditioning of power boiler flue gases for the purpose of improving the precipitability of the emitted fly ash. Chemical reactions resulting from ammonia injection are postulated. Measurements on three pulverized coal and two cyclone fired boilers, all of which emit acidic ash, are described. In all five cases, considerable but varying, increase in precipitator power input and collection efficiency resulted when gaseous ammonia in the amount of 1 5 ppm was injected between the economizer and air preheater. The conditioned fly ash showed decreased acidity and inconsistent change in electrical resistivity. Unless air heater temperatures were unusually high (>400°F), tendency of the air heater to plug was an additional, but unwanted, result. At one station with high air heater outlet temperature ammonia injection has been adopted as a permanent solution to community pressure for reduction of stack discharge. Ammonia inj...

Fly ash-asphalt mixtures

Abstract: NOVEL CURED PRODUCTS OF ASPHALT AND FLY ASH ARE PRODUCED BY COMPRESSION AND HEAT-CURING OF MIXTURES OF ASPHALT AND FLY ASH.

Proportioning Fly Ash Concrete Mixes For Strength and Economy

Abstract: A METHOD IS PRESENTED FOR PROPORTIONING FLY WITH CEMENT TO PRODUCE CONCRETE OF EQUAL STRENGTHS AT 28 AND 90 DAYS TO CONCRETE WITHOUT FLY ASH. THE METHOD WAS DEVELOPED BY THE TENNESSEE VALLEY AUTHORITY (TVA) AS A RESULT OF USING FLY ASH IN ALL CLASSES OF CONCRETE FOR THE PAST 12 YEARS. EFFECTS OF DIFFERING PROPORTIONS OF FLY ASH ON WATER REQUIREMENTS, STRENGTH, AND ECONOMY ARE GIVEN. THE EFFECTS OF FINENESS AND CARBON CONTENT OF FLY ASH AND VARIATIONS IN STRENGTH OF CEMENTS ON CEMENT REQUIREMENTS ARE DISCUSSED. COMPARISONS ARE MADE BETWEEN THE CEMENT REQUIREMENTS AS DETERMINED BY THIS METHOD WITH THE CEMENT ACTUALLY REQUIRED BY TESTS FROM THE CORPS OF ENGINEERS, TVA, AND BAYS MOUNTAIN CONSTRUCTION COMPANY. THE COMPARISONS WERE MADE USING AT LEAST NINE DIFFERENT SUPPLIERS OF CEMENT AND EIGHT DIFFERENT FLY ASHES, FOUR OF WHICH WOULD NOT MEET FEDERAL AND ASTM SPECIFICATIONS. /AUTHOR /

Sulfopozzolanically active fly ash and composition

Abstract: A new bituminous coal fly ash is sulfopozzolanically reactive and contains combined sulfate in stated proportions relative to alkaline earth metal oxide content. Load-supporting compositions of this fly ash combined with aggregate, and a method of applying the new fly ash to an existing surface.

Purification of waste gases

Abstract: COMPOUNDS OF SULFUR AND OF NITROGEN AND FLY ASH ARE REMOVED FROM GASES BY ABSORPTION AT BETWEEN 1500*F. AND 2000*F. UNDER ATMOSPHERIC TO 5 ATMOSPHERES PRESSURE IN A MOLTEN CARBONATE SALT OF SODIUM, POTASSIUM AND/OR LITHIUM, AND THE DECONTAIMINATED COMBUSTION GAS STREAM IS COOLED AND VENTED TO THE ATMOSPHERE.

Engineering and related properties of pulverised fuel ash

Abstract: THE AUTHORS DESCRIBE LABORATORY INVESTIGATIONS INTO THE SELF-HARDENING CHARACTERISTICS OF ASHES FROM DIFFERENT SOURCES AND THE VARIATION OF THESE CHARACTERISTICS IN ASHES TAKEN FROM THE SAME SOURCE AT DIFFERENT TIMES. THE INFLUENCE OF DEGREE OF COMPACTION AND COMPACTING MOISTURE CONTENT ON SELF-HARDENING IS ALSO CONSIDERED. THE ARTICLE IS CONCLUDED BY A DESCRIPTION OF THE SUCCESSFUL USE OF FINE AND COARSE PULVERISED FUEL ASH IN ROAD CONSTRUCTION WORK IN WARWICKSHIRE. A DISCUSSION IS INCLUDED. /RRL/

Filtration CharacteristicsOf Fly Ash from a Pulverized Coal-Fired Power Plant

Abstract: The operating characteristics of a pilot baghouse and the filtering characteristics of fly ash filtered from the flue gas of a pulverized coal-fired power plant were studied by techniques developed in the engineering research laboratories of the National Center for Air Pollution Control in Cincinnati. The permeability of the dust cake varied with the operating conditions of the baghouse in a way that significantly affects the pressure drop and power requirements of the system.

Improvements relating to methods of making mortar and concrete

Abstract: 1,218,411 Mortar and concrete THERMOCRETE BAUPATENTE - VERWERTUNGSGES ETAB 13 March, 1968, No 12235/68 Heading C1H Portland cement or lime mortars and concretes contain as a fine aggregate a crushed vitreous slag having a maximum grain size of 3 to 7 mm and of which, by weight, 3-25% is below 0A06 mm, 9-40% is below 0A2 mm, 43-80% is below 1 mm, and 30-60% is between 0A2 mm and 1 mm Suitable fine aggregates are fused boiler slag, direct process slag, granulated blast-furnace slag, slag from the production of phosphorus, sintered garbage incineration slag and mixtures of these A coarse aggregate of size 3-25 mm can be included, eg foamed slag, natural pumice, chips of volcanic and porous rocks (lava), expanded clay, porous aggregate made from fly ash, expanded slate, sintered grit, sintered garbage incineration slag and mixtures of these Synthetic resin may be included in the binder

Recovering pozzolanic material,a carbon concentrate,an iron concentrate and sintered aggregate from fly ash

Abstract: FLY ASH IS SUBJECTED TO A MAGNETIC SEPARATION TO REMOVE AN IRON CONCENTRATE PRODUCT. THE REMAINDER IS THEN SUBJECTED TO AIR CLASSIFICATION TO REMOVE A FINE POZZOLANIC MATERIAL WITH AT LEAST 85% OF THE PARTICLES BEING MINUS 325 MESH. THE REMAINING HEAVY ENDS ARE DRY SCREENED OVER A 100 TO 150 MESH SCREEN TO REMOVE A COARSE PRODUCT CONTAINING AT LEAST 25% CARBON. THE PRECISE DRY SCREEN SIZE IS SELECTED FROM THE RANGE OF 100-150 MESH TO MAINTAIN THE CARBON CONTENT IN THE -100 TO -150 MESH SINTER FRACTION WITH THE RANGE OF 5 TO 8%. THE SINTER FRACTION, IF NECESSARY, IS BLENDED WITH SUFFICIENT AMOUNTS OF POZZOLANIC MATERIAL TO REDUCE THE IRON CONTENT TO BELOW 10%, PELLETIZED AND SINTERED AT 1900*F. TO 2800*F.