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large calcining ore ore processing line in shiraz

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The combination crusher is a new generation high efficiency crushing machine designed and researched by integrating the domestic and foreign crusher technology with the same kinds and optimizing the main technical parameters.
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mineral processing- laron

Crushers (Rock Crushers) broadly categorized by jaw, roller, gyratory and cone crushers are the workhorse of the mining industry and are subject to extreme wear.  The gyratory (primary) crushers and the cone crushers are comprised of a cast outer shell lined with wear plates, a treaded adjustment mechanism and an inner cone with a wear mantle. New crushers, which involve large castings generally, have very long lead time, measured in year ARO so refurbishment represents an attractive alternative both in terms of cost and delivery. Laron’s full solution service begins with rigging and removal of the crusher, transportation to our FLSmidth® authorized service facility, cleaning and inspection for operational wear and damage, weld repair and machining to OEM dimensions and installation of new wear materials.  The refurbished machines are inspected and painted before being installed at the customer’s facility.  The ability to secure OEM parts and to work 24/7 results in expedited refurbishment and shorter down time.  Laron performs work on all Crusher manufacturers including: FLSmidth, Sandvik, Metso and many others

Crushing the ore bearing rocks is generally performed at the mine site and the crushed material is conveyed to the milling and concentrator sites via conveyers, which can be many miles in length.  Stackers (lifting, traveling or Slewing) are specialized conveyors used to position and stockpile the crushed material. Belt conveyors, use large motors and pulley heads to drive the belts, both of which require periodic refurbishment.  The belt troughs along with the access decking and safety rails are frequent field repair projects

In anticipation of concentrating the ore, large, rotating cylindrical Mills are used to pulverize the crushed ore bearing rock, through friction, impact and attrition.  There are several types of mills, characterized by the media used to grind the ore bearing rocks: Ball Mill, Rod Mill, SAG Mill and Autogenous mills.  By their very nature mills are self-destructive and require refurbishment to the feed ends, discharge ends, liner plates and the journals used to drive the rotating drums.  Given the large size of the mills, removal of the drum and journals requires riggers who are experienced in removal of this type of equipment and adept at lifting heavy loads in close quarters

mineral processing- laron

The flotation process allows for the efficient separation of waste particles and ore.  Many components are required to be in good repair to ensure a good yield.  Laron can provide repair, refurbishment and installation/removal services for the equipment required in the Flotation process including:

SX-EW (Solvent Extraction and Electrowinning) is a two-step Hydrometallurgy process used mostly in the Copper mining industry.  These processes are by and large chemical in nature and the equipment used is subject to the usual array of corrosive process resulting in failure to piping, pumps, filters, and tanks.  Cathodes and stripper racks are especially subject to wear.  Laron’s field service employees have vast experience in modifying process lines, pump repair, equipment removal and replacement.  Laron’s shop facilities can handle repair, refurbishment and manufacturing of tanks and pressure vessels.  Laron is equipped and staffed to mobilize for emergency repair or maintenance outages

us3865541a - method forprocessingcolemaniteore- google

[56] References Cited UNITED STATES PATENTS 987,850 3/1911 Braddock 241/26 X 1,934,930 l1/l933 Kent 241/54 2,469,562 5/1949 Kennedy 432/13 2,526,355 10/1950 Hesse 241/54 3,202,502 8/1965 Lean et al.... 241/23 X 3,712,598 4/1971 Miles 263/32 R Primary Examiner-John J. Camby Attorney, Agent, or FirmTorres & Berryhill [5 7] ABSTRACT In the method, a hot gas is flowed linearly through a slightly inclined treating area. Colemanite ore parti- 51 Feb. 11, 1975 cles are repeatedly elevated and dropped substantially vertically through the gas while they are simultaneously advanced countercurrent to the gas flow. This movement is continued until the ore particles are heated to the point of decrepitation at which they relatively suddenly break into a large number of relatively fine particles of substantially sure colemanite which are carried out of the treating area by the gas stream. The gas carried colemanite particles are then separated from the gas stream to provide an upgraded and classified product. Gas velocity and temperature and the path and rate of movement of the ore through the gas are varied as required to obtain a given grade or size in the recovered colemanite product.

The apparatus used in practicing the method includes, in a preferred form, a tubular calcining drum which is inclined slightly with respect to the horizontal. Lifters are positioned along the internal wall of the calcining drum and the drum is rotated between two stationary end assemblies. Ore particles are introduced into the upper end of the drum and a stream of hot gas is introduced through the lower end of the drum. Rotation of the drum causes the ore to be repeatedly lifted and dropped across the gas stream while the ore simultaneously advances from the upper toward the lower end of the drum. The temperature of the advancing ore increases to the point required to cause decrepitation of the ore, and the gas stream flowing through the drum carries the particles of decrepitation to the upper end of the drum where they are removed and separated from the gas stream. In the preferred form, gas leaving the drum is conveyed to a second rotating, inclined drum which functions as a preheater for ore being introduced into the calcining drum.

BACKGROUND OF THE INVENTION 1. Field of the Invention In its broader aspects, the present invention relates to methods for processing materials. The invention is used for processing colemanite ore which changes its physical characteristics upon heating to the extent required to permit the colemanite in the ore to be carried by a given fluid stream only after the colemanite ore under goes the change. The process is described herein with specific reference to colemanite ore materials which undergo a relatively sudden change in state in which large particles fragment into a large number of smaller particles when the large particles are heated to a critical temperature. As used herein, the term decrepitate" is employed to describe this relatively sudden fragmentation phenomenon. In the specific application to be described herein, the field of the invention relates to methods for calcining, upgrading and classifying colemanite ore materials of the type which decrepitate into relatively fine particles at a temperature below the temperature at which such materials fuse or agglomerate.

2. Brief Description of the Prior Art A common prior art method of processing ores such as colemanite and similar ores which decrepitate upon heating includes calcining the ore in a revolving, horizontally disposed kiln. Agglomeration or fusing of the decrepitated ore generally occurs and following the calcining process, the calcined ore must be crushed and passed through an air table or otherwise processed to separate the desired product from gangue or other impurity.

us3865541a - method forprocessingcolemaniteore- google

In another prior art process which eliminates the need for separate calcining and classifying steps, ore particles are calcined in a fluidized bed furnace in which an upwardly directed stream of gas is passed through the decrepitating ore to carry the finer particles of decrepitation away from the fluidized bed and the gangue. The gas and airborne particles are then separated to provide an upgraded, classified product.

Still another prior art process suggests the use of a vertical furnace having a stream of upwardly rising heated gases introduced at its lower end. Small ore par ticles are dropped into the top of the furnace and are increasingly heated as they fall downwardly toward the bottom of the furnace. Upon decrepitation of the particles, their change in state permits them to be carried upwardly out of the furnace by the rising gas stream where they may then be separated from the gas. Proper operation of the technique requires that the gas velocity be great enough to support or slow down the falling ore particles so that they may be heated to the point of decrepitation. Because of the relatively high gas velocity required to achieve this result, smaller particles of unprocessed ore are blown back and combined with the decrepitated ore particles. Where lower velocity gas flow is used in the latter technique, heavier particles of the ore fall completely through the furnace without reaching the temperature required for decrepitation. While it is theoretically possible to operate the lat ter process satisfactorily by introducing only ore parti- LII cles having a specific, uniform size and density, the time and expense required in sizing the raw ore would probably render the operation impractical.

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