Abstract: The invention relates to a method and apparatus for extracting gold from gold ore. The apparatus and process save capital and operating costs in the extracting of gold from gold ore and include comminution and leaching of the ore, and more particularly the apparatus and process reduce the costs for the ore grinding, and make a fine ore grinding superfluous without having to accept a reduction in the gold yield during leaching. The gold ore is subjected to a product bed stressing and interparticle crushing in the nip of a high-pressure roller press before being leached and the product that has been product-bed-comminuted and subjected to interparticle crushing and the product agglomerates thereby formed are piled on a heap that is sprayed with a lixivium.

Abstract: A method and apparatus for treating minerals such as coal in a jig bed having a downwardly opening air chamber beneath the bed wherein the chamber has an air compartment at the upper end retaining a cushioned pillow of air between each jig pulsation with controlled air admitted and relieved from the chamber so that when air is relieved, the water rising in the chamber compresses the air at the upper end and a cushion of air is retained so that with admission of pressurized air, the cushion aids in forcing the column of water from the chamber, particularly at the beginning of operation of the jig.

Abstract: A jigging machine, particularly a movable sieve jigging machine, for the preseparation of deads from valuable material comprises an oscillatory jig bed in the housing filled with separating fluid and comprises deads and valuable material discharge devices located therein, as well as an oscillatory drive for the jig bed. The jigging machine is suitable for underground mining operations in that the outer dimensions of the jigging machine, with respect to the height and width theeof, are designed smaller than the tunnel cross-section of an underground mining operation. A relatively low structure is achieved by designing the housing as a flat trough towards a deads discharge end with the deads discharge being provided as a rising conveyor parallel to the bottom of the trough. Advantageously it is achieved that the quantity of deads to be conveyed is reduced and a considerable saving is provided in terms of energy and expense.

Abstract: A baler has a housing normally displaceable in a travel direction along the ground and forming a rotary baling chamber, guides forming relative to the direction a passage having a forwardly opening front end and a rear end opening rearward into the chamber, a pickup device forward of the passage for picking a strand of crop up off the ground and feeding it up and back to the front end of the passage, and a conveyor having relative to a conveyor axis at least two angularly spaced sets of radially projecting and axially spaced arms engageable radially downward into the passage and movable backward in the passage to advance the strand of crop backward in the passage and into the baling chamber where it is wound up into a large cylindrical bale. The arms of each set are axially aligned with one another and angularly offset from the arms of the other set.

Abstract: A binding apparatus for tying up a round bale of harvested material formed in a baler, which is mounted on the housing of the baler, comprises at least one cord supply spool, a cord guide mechanism for guiding at least one cord along the upper surface of the round bale to tie the bale up, and a cutting mechanism for the cord, which is connected to the cord guide mechanism. The cord guide mechanism comprises at least one cord guide arm and a cord disk having a gear unit. The cutting mechanism is connected by means of a connecting rod to one end of a pulling strap, the other end of the pulling strap being attached by means of a pulling spring to a transverse truss provided for the binding apparatus, and on the cord guide mechanism an operating mechanism cooperating with the pulling strap is provided, in order to tie up the bale once or twice according to choice, before the cord is cut by the cutting mechanism.

Abstract: A process and a device for starting a gas turbine such as a jet engine which contains a compressor, a turbine and a combustion chamber by means of hot exhaust gases from an exhaust gas source, wherein the energy of the exhaust gases is transferred at least partially to the gas turbine for the starting process. For this purpose the hot exhaust gases are used for simultaneously driving the turbine and for igniting the combustion in the combustion chamber. A single exhaust gas source can be used. In this manner, a large number of component parts are eliminated and the reliability of the starting process is considerably increased overall.

Abstract: The baler for crop material comprises an intake mechanism, a feed mechanism for transporting the crop material from the intake mechanism to a chamber for pressing and binding. Between the feed mechanism and the chamber for pressing and binding a bale separator is provided for the continuously supply of crop material attached to the housing of the baler outside of the feed path, which cuts away a bale by operation of a bale separator hydraulic cylinder and a slider hydraulic cylinder, after which the bale is bound, while additional crop materials are continuously fed into the baler. The process of our invention for making bales in a baler comprises continuously feeding crop material into the baler, which a bale cut away from those supplying crop material is separated therefrom, bound by cord, and ejected from the baler.

Abstract: A windrower has a transverse support positioned at an angle to the travel direction of the apparatus and attached by a towing bar to a tractor and the like. The transverse support is provided with a plurality of crop-transfer drums, which are attached rotatably under the transverse support parallel to each other, and displaced from each other. At least one crop-transfer drum is swingable about its adjacent crop-transfer drum 180.degree. with respect to the axis of the adjacent crop-transfer drum in such a way that its axis retains its angle to the ground. Thus the crop-transfer drums have at least two configurations, in one of which all the crop-transfer drums are side-by-side with an equal spacing between adjacent drums of a width which is much smaller than the width of a crop-transfer drum, and in another in which there is at least one comparatively large gap between two adjacent crop-transfer drums substantially equal in width to the diameter of the crop-transfer drum.

Abstract: An apparatus for producing a hollow foundry core, whereby core halves are first formed and fully hardened on an inner hollow-mold part and an outer mold-box half. These core halves are then sprayed with an adhesive and joined to form a finished foundry core. The apparatus reduces the production costs and improves the accuracy as to the size of the cores. The forming of the core halves on a center plate and the bringing together of the core halves respectively occurs by moving together both core-box halves in one operation.

Abstract: The rotary mowing attachment for a tractor or the like comprises a mowing drum mounting member, preferably a mounting bar, laterally mountable on a tractor or the like, four mowing drums attached to the underside of the mowing drum mounting member, and at least one cutting tool attached to each mowing drum, wherein the cutting diameters of the cutting tools on at least two mowing drums are different, the cutting diameters of all adjacent mowing drums overlap, and at least one of the mowing drums rotates in a direction of rotation opposite to that of the remaining mowing drums.

Abstract: A service console for the operator's position of a tractor which, as seen from the side, has a mushroom shape and is mountable into the front wall of the cabin of the tractor as a unit, the console at about its center supporting an inverted U-shaped bar for detachable connection to the front wall, so that the part of the console behind the bar extends into the cabin and the other part in front of the front wall extends forward into the area of the motor.

Abstract: A method for the desulfurization of a calcium containing flue gas stream from a firing system such as a cement making plant wherein at least partially deacidified, hot raw cement meal is added to the flue gas at selected points to absorb the sulfur oxides to the calcium present in the gas. The preferred form of the invention comprises suspending the deacidified raw cement meal in the flue gas in the form of a cloud of airborne dust, and thereafter separating the dust from the flue gas after the sulfur oxides have been bonded to the calcium.

Abstract: A method for the thermal treatment of mineral raw materials containing calcium carbonate and similar carbonates, particularly for the production of calcined products such as burnt lime, cement, magnesite, dolomite or the like wherein the raw material carriers of the calcium or other carbonate constituents are supplied to the calcining unit with a particle size of from 1 mm to 25 mm. The calcareous constituents are preferably supplied to the calcining unit with a particle size from 1 mm to 4 mm. To achieve this condition, the raw material containing the calcareous constituents is preferably pre-crushed to a particle size below 200 mm and pre-homogenized. It is then supplied to a drying comminution system connected to the calcining unit at the gas side and is suspended therein in direct heat exchange relationship with the gases. The material is preferably processed by means of single-stage crushing and grading to form the appropriate particle size.

Abstract: An apparatus for partial dehydration of a sludge in the centrifugal field of a centrifuge wherein the residual moisture of the sludge is substantially reduced with a comparatively low compression of the sludge, and the non-effective cone length of the centrifuge is reduced without shortening the sludge dwell time. The invention includes an arrangement of agitator elements within the centrifugal drum, coupled with a following shearing centrifuge and decanter, the shearing centrifuge being connected at the discharge of the centrifugal drum.

Abstract: A method and apparatus for cleaning hot gases produced during a coal gasification process in a reactor, wherein the hot gases leaving the reactor are cooled in a plurality of cooling stages to a relatively low temperature. In accordance with this invention, a particulated solid is added to the hot gases and circulated through at least one of the cooling stages. The particulated solid may be a material which decomposes in the hot gases to liberate carbon dioxide or it may be inert.The apparatus of the invention makes use of a heat exchanger which functions as a radiant cooler and also as a mixer for the gases and solids, the heat exchanger being connected directly to the gasification reactor at the exhaust gas side thereof. The heat exchanger is followed by at least one downstream, multi-stage cyclone fluidized bed heat exchanger which also is provided with an indirect heat exchange capability.

Abstract: For cone crushers comprising an eccentrically-driven crushing cone, it is necessary to provide a labyrinth seal between the inwardly disposed eccentric drive and the crushing cone, the upper seal half thereof being connected to the crushing cone and the lower seal half thereof being connected to the eccentric drive. A new labyrinth seal is essentially distinguished in that helically extending fluids are provided on at least one wall of a cylindrical ring of the lower and/or upper seal half. It is thereby achieved that the slight air flow constantly emerge from the sealing gap and a penetration of dust into or, respectively, through the sealing gap is reliably prevented.

Abstract: A rotary mowing attachment has a transverse support positioned at an angle to the travel direction of the apparatus and attached by a towing bar to a tractor and the like. The transverse support is provided with a plurality of mowing drums, which are attached rotatably under the transverse support parallel to each other, and displaced from each other. At least one mowing drum is swingable about its adjacent mowing drum 180.degree. with respect to the axis of the adjacent mowing drum in such a way that its axis retains its angle to the ground. Thus the mowing drums have at least two configurations, in one of which all the mowing drums are side-by-side with an equal spacing between adjacent drums of a width which is much smaller than the width of a mowing drum, and in another in which there is at least one comparatively large gap between two adjacent mowing drums substantially equal in width to the diameter of a mowing drum.

Abstract: A roller crusher for receiving a harder to grind material, means mixing the harder to grind material with an easier to grind material and delivering the mixed materials to a ball mill for common grinding, separating the remaining coarse particles from material received by the grinder by a sieve or a cyclone, and recirculating the remaining the coarse particles to the ball mill.

Abstract: In a centrifugal pump, particularly for conveying tailing water in dressing plants for minerals such as coal, as for flue gas desulfuration systems or the like, a spiral housing is clamped between two retainer plates which externally connect to parallel wear walls without being bolted thereto. The retainer plates are designed as a two-piece, externally screw-connected enclosure for a hydraulics portion of the pump. The spiral housing is connected with the external screw-connection over retaining lugs. The enclosure parts are designed as flat retainer plates having a smooth clamping face for the spiral housing and the wear walls, and exhibit feet that have been welded on.

Abstract: A mechanism and method for treating sludge material for separating the material into solid and liquid phases in a centrifugal separator having a rotating drum and an advancing screw driven at a speed differential relative to the drum, conveying a solid phase of the sludge to a digester tower for generating a biogas, delivering the biogas to a collection chamber and feeding the biogas to a gas powered prime mover connected to drive the centrifugal separator through a hydraulic pump and motor drive with the biogas generated and supplied to the motor commensurate with the speed of operation of the separator.