| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 61 | Coal cleaning process | US775860 | 1991-10-15 | US5314124A | 1994-05-24 | James K. Kindig |
| Fine particle coal is beneficiated in specially designed dense medium cyclones to improve particle acceleration and enhance separation efficiency. Raw coal feed is first sized to remove fine coal particles. The coarse fraction is then separated into clean coal, middlings, and refuse. Middlings are comminuted for beneficiation with the fine fraction. The fine fraction is deslimed in a countercurrent cyclone circuit and then separated as multiple fractions of different size specifications in dense medium cyclones. The dense medium contains ultra-fine magnetite particles of a narrow size distribution which aid separation and improves magnetite recovery. Magnetite is recovered from each separated fraction independently, with non-magnetic effluent water from one fraction diluting feed to a smaller-size fraction, and improving both overall coal and magnetite recovery. Magnetite recovery is in specially designed recovery units, based on particle size, with final separation in a rougher-cleaner-scavenger circuit of magnetic drum separators incorporating a high strength rare earth magnet. | ||||||
| 62 | Heavy media separation process and apparatus therefor | US756657 | 1991-09-09 | US5263590A | 1993-11-23 | Paul A. Olivier |
| A method and apparatus for making a very precise separation between materials of different specific gravities. A heavy media separation apparatus for separating a heterogeneous mixture of solid particles having different specific gravities, comprising: a device for adding a suspension medium to the heterogeneous mixture, the suspension medium having suspended therein sufficiently fine particles so that the fluid has an average specific gravity intermediate that of the gravities of the particles to be separated; a device for introducing the heterogeneous mixture, to which the suspension medium has been added, half-way down a separatory vessel, in order to separate the heterogeneous mixture into a first fraction having a gravity lower than the gravity of the suspension medium and into a second fraction having a gravity higher than the gravity of the suspension medium, the first fraction floating and the second fraction sinking in the separatory vessel; a device for controlling and regulating vessel rise rates and vessel settling rates within the suspension medium in the separatory vessel so that they have approximately the same value and in such a manner that they exceed the minimal velocities required to maintain a uniform and stable suspension medium but do not exceed the particle rise rates and particle settling rates of the mixture of solid particles differing in specific gravity by one or two points to the third decimal place; and a device for gathering and evacuating float particles at the top and sink particles at the bottom of said suspension medium. | ||||||
| 63 | Process for beneficiating particulate solids | US742903 | 1991-08-09 | US5262962A | 1993-11-16 | James K. Kindig |
| The present invention provides a method for selecting magnetite to form a dense media for beneficiation of fine particulate solids such that the particulate solids are as buoyant with respect to the dense media as if the solids were in a true liquid having a specific gravity equal to that of the dense media. The method involves determining a magnetite particle diameter such that the diameter ratio of particulate solid to magnetite lies above a diameter ratio partition curve. The invention is also directed toward using magnetite having a particle diameter less than about 0.005 mm and a mean particle diameter of about 0.0025 mm. Such magnetite is formed from a gas phase pyrohydrolysis reaction on an aqueous iron (ferrous) chloride solution. The present invention is further directed towards a method for determining the efficiency of separation of a dense media separation process. This method includes determining an apparent distance a particle must travel in a dense media cyclone to be correctly beneficiated. From this apparent distance, an apparent velocity a particle must achieve to be correctly beneficiated is calculated. This apparent velocity is used, along with cyclone geometry and operational parameters to calculate a divergence value which indicates the efficiency of separation. The present invention also includes a method for selecting cyclone geometry and operating parameters which includes determining separation efficiency and adjusting geometry and parameters in a manner to obtain improved efficiency. | ||||||
| 64 | Method of beneficiating coal | US827320 | 1992-01-29 | US5236089A | 1993-08-17 | James B. Smitham; Ray Keast-Jones; John F. Ellison; Keith R. S. Horrocks |
| The separation density of a dense media comprising a slurry of magnetite and water in a cyclone for beneficiating coal containing refuse is maintained within predetermined limits by: (a) measuring the total solids in an overflow of the cyclone; (b) comparing the total solids with a predetermined correlation with separation density; and (c) changing the relative proportions of the feed flow of magnetite and water to the cyclone when the separation density as determined by the correlation is outside the predetermined limits. | ||||||
| 65 | System for controlling separating gravity in dense-media cyclone | US402495 | 1982-07-28 | US4470901A | 1984-09-11 | Curtis L. Burgess |
| This invention is directed to a method of beneficiating a material, such as coal, by subjecting the coal to be treated to the action of a dense-media cyclone, where the dense-media thereof is a slurry of magnetite in water. More particularly, the present invention relates to a method to control the separating gravity of said cyclone within predetermined limits by (1) measuring the flow rate and percent magnetite in the flow discharging from the cyclone, and (2) based on pre-calibrated data, adjusting the feed flow and content, i.e. magnetite and/or water, into said cyclone, thereby controlling said separating gravity within predetermined limits. | ||||||
| 66 | Process for cleaning undeslimed coal | US351384 | 1982-02-23 | US4405453A | 1983-09-20 | Charles H. Wells |
| A process for cleaning undeslimed coal includes the steps of determining the scalar value of cross-correlation function of the measured values of the percent magnetics and the bulk specific gravity of a heavy media and coal slurry being fed to a cyclone, comparing the value to a set-point value determined after start-up when the recirculating suspension in the feed slurry is normally clean, and diverting at least a portion of the heavy media suspension that is separated from the underflow of the cyclone from being mixed with the feed coal slurry, to thereby correspondingly reduce the slime content of the feed slurry, and concurrently increasing the flow of cleaner heavy media suspension to the feed coal slurry until the cross-correlation function is brought up to the set-point value. Also disclosed is an embodiment of the process for cleaning coal, wherein the overflow from the cyclone is screened and screened solution is split between a first recycle loop for cleaning the suspension and the heavy media sump. Similarly, the underflow from the cyclone is screened and then split between a separate recycle loop and the heavy media sump. Suspension is diverted to the heavy media sump from one or both recycle cleaning loops as necessary. The remaining portions of the split suspension flows from the two screening devices are, in turn, respectively split between two further sumps and the heavy media sump, with more suspension coming from the cyclone overflow screen when cleaner suspension is indicated as being necessary by the aforesaid statistical analysis. | ||||||
| 67 | Autogenous heavy medium process and apparatus for separating coal from refuse | US279627 | 1981-07-01 | US4364822A | 1982-12-21 | John W. Rich, Jr. |
| Coal is separated from mining refuse utilizing an autogenous non-magnetic heavy medium and one or more cyclonic separators. In the process, raw input from mine tailings is screened and mixed with heavy medium to form an aqueous slurry feedstock. The feedstock slurry flows through a primary cyclonic separator which causes a coal-rich portion to exit its overflow and a refuse-rich portion to exit its underflow. The coal-rich overflow is dewatered to produce clean coal solids and a water-rich underflow slurry. The refuse-rich underflow from the primary cyclone is dewatered to produce solid refuse particles and one portion of the heavy medium. Another portion of the heavy medium is obtained by the underflow from the coal-rich slurry dewatering equipment. The primary cyclone has a cylindrical section with an axial extent greater than its inside diameter for imparting to tangentially-admitted feedstock slurry a substantially constant acceleration followed immediately by increasing acceleration in a depending conical portion. A vortex finder depends to about the middle of the cylindrical chamber for exhausting the coal-rich overflow slurry therefrom, and the refuse-rich underflow slurry is discharged through a bottom orifice. If desired, the refuse-rich underflow from a dewatering cyclone located downstream of the primary cyclone can be crushed and recycled through the primary cyclone to separate middlings. | ||||||
| 68 | Process and apparatus for cleaning very fine ore | US654230 | 1976-02-02 | US4028228A | 1977-06-07 | David D. Ferris; Kenneth E. Harrison |
| In an ore cleaning process the underflow from an ore classifying cyclone is delivered to a heavy medium cyclone where the ore is cleaned. The underflow leaving the classifying cyclone is continually measured for specific gravity and flow rate while the specific gravity of heavy medium that can be applied to the underflow is continually measured. The amount of this heavy medium and the amount of water required to be added to the underflow are continually controlled as functions of the specific gravity and flow rate thus measured, whereby a substantially constant specific gravity and flow rate of the underflow is maintained as it enters the heavy medium cyclone. Magnetic separating means receive the overflow from the heavy medium cyclone and separate the heavy medium from the ore, while other magnetic separating means receive the underflow from the same cyclone and separate the heavy medium from the rejects. The heavy medium is used again. | ||||||
| 69 | Separation of solids by varying the bulk density of a fluid separating medium | US846770 | 1970-02-04 | US3822015A | 1974-07-02 | KORNBERG H; HSIEH J; CLINE J |
| A method and apparatus for separating discrete solid articles according to their density is described. A fluid is placed in a vessel, and discrete solid articles having various densities are placed therein. The density of the fluid is altered to a value which will cause separation of the solid articles due to differences in buoyancy. The density of the fluid separating medium is preferably altered by injection of small gas bubbles or other fluid substances having a density differing from the first fluid placed in the vessel.
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| 70 | Apparatus and control for hot water process | US3530042D | 1967-11-20 | US3530042A | 1970-09-22 | GRAYBILL JAMES B; WHITE CHESTER N; LOVELAND JUNIOR W |
| 71 | Method and apparatus for controlling cleanness of a heavy medium suspension | US23694562 | 1962-11-13 | US3282417A | 1966-11-01 | CHASE PAUL W; HENDRICKSON LUTHER G |
| 72 | Control method and apparatus for heavy media separation process | US8081561 | 1961-01-05 | US3235072A | 1966-02-15 | NELSON DAVID L |
| 73 | Process and apparatus for causing a liquid to flow along different conduits depending on the viscosity of the liquid concerned | US31455652 | 1952-10-13 | US2769546A | 1956-11-06 | FONTEIN FREERK J |
| 74 | Bath regulator for dense media separation systems | US42033654 | 1954-04-01 | US2717079A | 1955-09-06 | LEVI CASS B |
| 75 | Automatic density regulator | US41478954 | 1954-03-08 | US2717078A | 1955-09-06 | LEVI CASS B |
| 76 | Method for sink and float mineral separation | US18660450 | 1950-09-25 | US2692048A | 1954-10-19 | DAVIS NELSON L |
| 77 | Apparatus for the separation of materials | US21277938 | 1938-06-09 | US2222030A | 1940-11-19 | GEORGE HAGUE HAROLD |
| 78 | Method of washing coal | US5580735 | 1935-12-23 | US2205942A | 1940-06-25 | CROSS JR WALTER M |
| 79 | Method and apparatus for separating fragmentary minerals of different specific gravities in crushed ores | US65519633 | 1933-02-04 | US2139789A | 1938-12-13 | ERB WUENSCH CHARLES |
| 80 | Process of separating mixed materials | US54551031 | 1931-06-19 | US2052004A | 1936-08-25 | REMICK WALTER L |
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