초록 ▼

A series of preferably superimposed low inclination troughs containing serial inclined blade rotating mixers and transporters is provided to react dry materials and liquids, and in particular borax with water and acid, in a manner which avoids the formation of refractory lumps and the like. Those ar

A series of preferably superimposed low inclination troughs containing serial inclined blade rotating mixers and transporters is provided to react dry materials and liquids, and in particular borax with water and acid, in a manner which avoids the formation of refractory lumps and the like. Those are at least two series of rotating blades to both mix and lift the materials into a gas drying stream passing along the troughs. A shearing type grinder or hammer mill is positioned intermediate of the troughs to grind or break up the material part way through the apparatus. Material is discharged from the apparatus in a dry finely comminuted form which does not form lumps upon standing.

대표청구항 ▼

A method of producing a boric acid type fire retardant material comprising: (a) discharging borax, water and sulfuric acid in that order into a reactant zone of a trough slightly inclined at an angle of from one half to 5 inches in twenty feet from horizontal and conveying the said reactants along s

A method of producing a boric acid type fire retardant material comprising: (a) discharging borax, water and sulfuric acid in that order into a reactant zone of a trough slightly inclined at an angle of from one half to 5 inches in twenty feet from horizontal and conveying the said reactants along said trough by rotating blade means aided by gravity, the blade means having an angle of about 35 to 55 degrees with respect to the axis of the shaft upon which said blades are mounted, (b) meanwhile lifting the reactants and resulting moist reacted product into contact with the atmosphere over the body of reactants and product and partially conveying said reactants and product by means of blades having an angle of 60 to 80 degrees with the axis of the shaft upon which said blades are mounted, (c) the moist reacted product of said reactants plus any unreacted reactants being conveyed into a drying zone where they are, in order to effect drying of such rected and nonreacted materials lifted periodically into countercurrently flowing hot gases by blades having an angle not greater than the angle of repose of the material being dried and where said product and any unreacted reactants continue to be conveyed along troughs by 35 to 55 degree angled blades, (d) and intermediately of adjacent superposed sections of troughs containing the 35 to 55 degree inclined blades and blades having an angle not greater than the angle of respose of said materials being dried passing said product materials into a shearing type hammer mill where oversize particles are reduced in size, (e) the relative feed and discharge from the apparatus and rate of rotation of the rotating mixing and conveying means being such as to maintain a body of reactants and reacted products in the bottom of the troughs having a depth of about 10 to 35 percent of the depth of the trough from the bottom thereof to the axis of the shaft upon which the blades are mounted. An apparatus for making a substantially dry finely divided reaction product from granular and liquid reactants which tend to form pasty and/or lump reaction products comprising: (a) a first trough means having a reaction zone at one end and a discharge zone at the opposite end with a rotary conveying means extending along the trough from the reaction zone to the discharge zone, (b) a rotary blade fracturing means receiving the discharge from the first trough means, (c) a second trough means with a rotary conveying means extending therethrough from the discharge of the rotary blade fracturing means to a discharge from the trough, (d) forced draft means for drawing heated gas through the second and first trough means to dry the material within the troughs, (e) first substantially angled separate blade means on the rotary conveying means to urge the reaction product along the first and second trough means, (f) second substantially unangled separate blade means on the rotary conveying means to lift the reaction product periodically from a bed of material in the trough and carry it through the heated gas passing through the machine, (g) third partially angled separate blade means on the rotary conveying means in the initial reaction zone, (h) the first substantially angled blade means being mounted upon the rotary conveying means at an angle calculated to move the finely divided reaction product along without severely compacting it or causing the finely divided reaction product to form lumps so long as the outer surface of the finely divided material at least is substantially dry, (i) the second substantially unangled blade means being mounted upon the rotary conveying means at an angle within the angle of repose of substantially dry particulates of the type to be treated in the drying sections of the apparatus, said second unangled blades being arranged and constructed in conjunction with the rotary conveying means to lift dried and drying particulates from a bed of particulates in the second portion of the first trough means and the second trough means to expose said particulates to heated gas passing through the troughs, (j) the third partially angled blade means in the initial reaction zone of the first trough means being inclined at an angle between that of the first substantially angled blade means and the second substantially unangled blade means and being calculated to lift and mix the reacting particulates and at the same time aid in moving said particulates gently along, and (k) the first angled blade means and the second substantially unangled blade means being interspersed between each other along the rotary conveying means in the second portion of the first trough means and in the second trough means and the first angled blade means and third partially angled blade means being interspersed between each other in the initial reaction zone of the first trough means.