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Process for the recovery of sodium carbonate from salt mixtures
VIII
New Patents
4564458
4565138
METHOD AND APPARATUS FOR DISPOSAL OF A BROAD SPECTRUM OF WASTE FEATURING OXIDATION OF WASTE
THERMAL DECOMPOSITION FURNACE OF WASTE TIRES Yoshihiko Ueda, Ikuo Saito, Kazumasa Sakae, Tetuo Oogiri, Chiba, Japan assigned to Onoda Cement Co Ltd
James C Burleson In the preferred and illustrated embodiment, a deep well is utilized to form a reaction chamber for combustible waste in water. A stream of water born combustible waste is delivered into a deep well, sufficiently deep to obtain a pressure and temperature in a bottom located reaction chamber at which the water becomes supercritical, there being a pipe for delivering oxygen under pressure for combusting oxygen dissolved in the supercritical water with the waste materials. The reaction is exothermic to sustain itself. It is started preferably by electric current flow to initially raise the temperature in the reaction chamber. The preferred structure is a cased abandoned well having a surrounding cement bond to the formation thereby retarding heat lose into the formation, the bottom located reaction chamber sustaining supercritical conditions.
4564508 PROCESS FOR THE RECOVERY OF SODIUM CARBONATE FROM SALT MIXTURES Michael J Fairweather, Michael Rockandel, Abraham Sadan, Godefridus M Swinkels, Rossland, Canada assigned to Cominco Ltd Mined salt mixtures comprising sodiumcarbonate, -bicarbonate, -chloride, -sulfate, and -double salts, such as trona and burkeite, are leached with a bicarbonate-saturated solution and added carbon dioxide to selectively dissolve the sodium chloride, sodium sulfate and burkeite and to precipitate additional trona, leaving a leach residue consisting essentially of trona. The trona is calcined and dissolved, and the carbonate solution is purified, crystallized and dehydrated in a non-convective solar pond yielding high purity sodium carbonate monohydrate which is converted into dense soda ash. The brine solution from the leach may be treated for the recovery of a further amount of trona.
A thermal decomposition furnace in which waste tires having original shape, not broken up, can be laid horizontally and be thermally decomposed. The furnace is constructed by providing a feeder above, forming downward a fluidized bed-forming section having inlets for air, forming beneath a sealing bed-forming section of right cylindrical shape having a diameter smaller than that of fluidized bed-forming section, and installing a conveyor below said sealing bedforming section. At the lower end of sealing bedforming section, an oblique opening is formed so as to keep a progressively increasing clearance to the conveyor in the direction of advance of conveyor.
4565444 ELECTRONICALLY SCANNED SPECTROMETER COLOR, BRIGHTNESS AND OPACITY MEASUREMENT AND CONTROL SYSTEM John W Mactaggart, Bolton, Canada assigned to Sentrol Systems Ltd Apparatus for measuring the color, brightness and opacity of a moving web in which light from a plurality of sources is directed towards and through a moving web. Light reflected from the surface of the web is conveyed by a plurality of light pipes to a first photodetector array located at a point remote from the web. A circular variable bandpass filter varies the wavelength of the radiation reaching the detector substantially continuously through the optical spectrum to produce a detector output which periodically scans the optical spectrum. The detector outputs at various wavelengths are weighted by a microcomputer to produce brightness and X, Y and Z tristimulus values. Light transmitted through the web is conveyed by a plurality of light pipes to a second photodetector array also located at a point remote from the web. The photodetector is also monitored by the microcomputer to provide an indication of the opacity of the web.
New Patents
4564458
4565138
METHOD AND APPARATUS FOR DISPOSAL OF A BROAD SPECTRUM OF WASTE FEATURING OXIDATION OF WASTE
THERMAL DECOMPOSITION FURNACE OF WASTE TIRES Yoshihiko Ueda, Ikuo Saito, Kazumasa Sakae, Tetuo Oogiri, Chiba, Japan assigned to Onoda Cement Co Ltd
James C Burleson In the preferred and illustrated embodiment, a deep well is utilized to form a reaction chamber for combustible waste in water. A stream of water born combustible waste is delivered into a deep well, sufficiently deep to obtain a pressure and temperature in a bottom located reaction chamber at which the water becomes supercritical, there being a pipe for delivering oxygen under pressure for combusting oxygen dissolved in the supercritical water with the waste materials. The reaction is exothermic to sustain itself. It is started preferably by electric current flow to initially raise the temperature in the reaction chamber. The preferred structure is a cased abandoned well having a surrounding cement bond to the formation thereby retarding heat lose into the formation, the bottom located reaction chamber sustaining supercritical conditions.
4564508 PROCESS FOR THE RECOVERY OF SODIUM CARBONATE FROM SALT MIXTURES Michael J Fairweather, Michael Rockandel, Abraham Sadan, Godefridus M Swinkels, Rossland, Canada assigned to Cominco Ltd Mined salt mixtures comprising sodiumcarbonate, -bicarbonate, -chloride, -sulfate, and -double salts, such as trona and burkeite, are leached with a bicarbonate-saturated solution and added carbon dioxide to selectively dissolve the sodium chloride, sodium sulfate and burkeite and to precipitate additional trona, leaving a leach residue consisting essentially of trona. The trona is calcined and dissolved, and the carbonate solution is purified, crystallized and dehydrated in a non-convective solar pond yielding high purity sodium carbonate monohydrate which is converted into dense soda ash. The brine solution from the leach may be treated for the recovery of a further amount of trona.
A thermal decomposition furnace in which waste tires having original shape, not broken up, can be laid horizontally and be thermally decomposed. The furnace is constructed by providing a feeder above, forming downward a fluidized bed-forming section having inlets for air, forming beneath a sealing bed-forming section of right cylindrical shape having a diameter smaller than that of fluidized bed-forming section, and installing a conveyor below said sealing bedforming section. At the lower end of sealing bedforming section, an oblique opening is formed so as to keep a progressively increasing clearance to the conveyor in the direction of advance of conveyor.
4565444 ELECTRONICALLY SCANNED SPECTROMETER COLOR, BRIGHTNESS AND OPACITY MEASUREMENT AND CONTROL SYSTEM John W Mactaggart, Bolton, Canada assigned to Sentrol Systems Ltd Apparatus for measuring the color, brightness and opacity of a moving web in which light from a plurality of sources is directed towards and through a moving web. Light reflected from the surface of the web is conveyed by a plurality of light pipes to a first photodetector array located at a point remote from the web. A circular variable bandpass filter varies the wavelength of the radiation reaching the detector substantially continuously through the optical spectrum to produce a detector output which periodically scans the optical spectrum. The detector outputs at various wavelengths are weighted by a microcomputer to produce brightness and X, Y and Z tristimulus values. Light transmitted through the web is conveyed by a plurality of light pipes to a second photodetector array also located at a point remote from the web. The photodetector is also monitored by the microcomputer to provide an indication of the opacity of the web.