Showing papers on "Sawdust published in 1972"

Method of and apparatus for removing wood particles yielded in chipboard production

Abstract: A system for use in the manufacture of chipboard including a method and apparatus initially involving the use of wood particles including grinding dust, sawdust, scrap wood and similar particles normally available in operations involved in the conventional manufacture of chipboard. The particles are located in a mixing means along with an adhesive, and a compacting apparatus is provided for forming the mixture of particles and adhesive into chip-shaped compacts. These compacts are then employed with conventionally produced chips to provide the material for making the chipboard.

Production of charcoal from sawdust in a fluidized bed

Abstract: A method for disposing of wood refuse and recovering valuable wood by-products without polluting the ennvironment by mixing the wood refuse with inert granulated bed material to form a fluidizable mixture which is heated in a fluidized bed pyrolyzer until charcoal and other by-products are formed. Upon discharge of the charcoal and bed material from the pyrolyzer, they are separated and the inert material is mixed with additional wood refuse and recirculated through the pyrolyzer while the charcoal is cooled in an oxygen-free atmosphere. The other wood byproducts are carried from the pyrolyzer with the off-gas, from which they are separated and recovered for further processing, leaving only the purified off-gas to be vented to the environment. The method is also useful for producing activated charcoal by treating the charcoal and bed material mixture in a second fluidized bed to activate the charcoal before discharge to the separator and charcoal cooler. Also disclosed is a fluidized bed containment vessel having a baffled interstructure to eliminate back mixing of the wood refuse with the charcoal already formed in the bed.

Pulp bound compacted fuels

Abstract: COMPACTED AND BOUND SOLID PARTICLES, FOR EXAMPLE FUELS SUCH AS BARBECUE BRIQUETTES AND FIREPLACE LOGS MADE FROM PARTICULATE COMBUSTIBLE MATERIALS SUCH AS SAWDUST, WOOD FLOUR, CHARCOAL, AND COKE IN WHICH THE BINDER FOR THE COMBUSTIBLE MATERIALS IS CELLULOSE FIBRES DERIVED FROM PAPER PULP.

Process for recovering forest product plant wastes

Abstract: A PROCESS FOR THE CLOSED-CIRCUIT PROCESSING OF ALL WASTE PRODUCTS FROM FOREST PRODUCT PLANTS, WITHOUT AIT OR WATER POLLUTION. SOLID WASTES, TYPICALLY BARK, WOOD CHIPS, SAWDUST OR THE LIKE, ARE CARBONIZED TO A CHAR. THE CHAR IS AT LEAST IN PART TREATED IN A SECOND FURNACE TO PRODUCE ACTIVATED CARBON, CHAR NOT SO TREATED BEING BRIQUETTED AND SOLD. THE ACTIVATED CARBON IS USED AS A FUILTER MEDIUM FOR PLANT EFFLUENT LIUORS, WHICH CAN BE RECYCLED AFTER SOLIDS REMOVAL. THE CARBON AND ENTRAINED SOLIDS ARE RETURNED TO ONE OF THE FURNACES. OFF-GAS FROM ALL FURNACES IS PASSED TO A BOILER FOR STEAM GENERATION, THE SPENT GAS BEING PASSED THROUGH AN ABSORBER,IF NECESSARY, BEFORE RELEASE.

Dehydrating sewage sludge by admixing cellulosic wastes - to create optimal conditions for biological decomposition and prodn. of compost

Abstract: Sludge from municipal sewage clarification tanks is mixed with waste paper, cardboard, cellulosic textiles, or sawdust and other wood wastes to effect dehydration and ensure the optimum carbon, nitrogen ratio and moisture content for biological decomposition and formation of compost. Alternatively, the dehydrated produce can be burnt. Waste paper or cardboard exerts strong dehydrating effect due to capillary forces. Cellulosic textile materials greatly facilitate filtration. Acids, such as H2SO4 are not used so that the product is harmless and can be used as compost.

Smoke generator - esp for smoking foodstuffs using heated sawdust or wood chippings

Abstract: Sawdust is gravity fed from a hopper through a telescopic, vertical feed pipe passing through a clearance hole in a bulkhead above which is a smoke box with a smoke exhaust pipe, and on to a rotating paddle between an upper plate also with a clearance hole for the feed pipe, and a lower plate with a heater esp. electric between the plates and a controlled air flow system to provide combustion air for the slow burn of the sawdust which may be additionally moistened. Simple, relatively cheap, generator whose operation can be easily controlled.

Method for producing chipboards from chip mixtures using material in powder or fiber form

Abstract: 1. A METHOD OF PRODUCING A CHIPBOARD, WHEREIN CHIPSHAPED WOOD COMPACTS ARE INCLUDED IN A MAT IN ADMIXTURE WITH WOOD CHIPS, COMPRISING: 8A) MIXING A CONSOLIDATING-PROMOTING BONDING AGENT WITH WOOD PARTICLES SELECTED FROM THE GROUP CONSISTING OF WOOD GRINDING DUST, SCREENING WOOD RESIDUE AND SAWDUST, (B) PLACING SAID MIXTURE BETWEEN OPPOSED SURFACES OF PRESSING MEANS, (C) COMPACTING SAID MIXTURE INTO A CONSOLIDATED CONDITION, (D) SUBDIVIDING SAID CONSOLIDATE MIXTURE INTO CHIPSHAPED COMPACTS UP TO 18 MM. LONG, 5-10 MM. WIDE AND 0.5-5MM. THICK, (E) MIXING SAID CHIP-SHAPED COMPACTS, UNIFORMLY TOGETHER WITH SAID WOOD CHIPS, (F) FORMING SAID MIXTURE OF SAID COMPACTS AND SAID WOOD CHIPS INTO A MAT, AND (G) PRESSING SAID MAT IN A MANNER TO BOND SAID COMPACTS AND SAID WOOD CHIPS INTO SAID CHIPBOARD.