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An apparatus and a method for performing maintenance on grinding discs are disclosed. The apparatus can be positioned below the housing of a vertical grinding mill and attached to the housing in order to provide temporary support for grinding discs when the grinding discs are removed from the housing. The apparatus can be rotated so that it is in a longitudinal position when the grinding discs are within the housing.


A high voltage power supply for an electrostatic precipitator comprises a high voltage transformer, a high voltage bridge rectifier and a semiconductor switch controller configured to control an output power level of the high voltage power supply. A control unit (50) is configured to determine a firing angle of firing pulses for the semiconductor switch controller. During normal operation, a peak voltage value is measured and stored in each half period. When a breakdown is detected, a residual voltage (U_(r)) over the electrostatic precipitator is measured. A firing angle (_(1)) of a firing pulse to be provided to said semiconductor switch controller in the first half period after the breakdown is determined from the latest stored measured peak voltage value (U_(bef)) and the measured residual voltage (U_(r)) based on a predetermined relationship between the firing angle (_(1)) and said measured voltages.


Patent
FLSmidth, Inc. | Date: 2017-04-19

The invention relates to a wear-resistant roller (1) for crushing of particulate material, such as crude ore for use in the cement or minerals industry comprising a roller body (2), a wear surface (3) on the roller body (2). The wear surface (3) comprises welding beads (4) comprising a primary fraction of carbide material and a secondary fraction of material selected from the group consisting of Nickel, Nickel alloys, mixtures of Nickel and Nickel alloys and mixtures of Nickel containing refractory hard materials, Cobalt, Cobalt alloys, mixtures of Cobalt and Cobalt alloys and mixtures of Cobalt containing refractory hard materials. Furthermore, the welding beads (4) are welded to the roller body (2) in an overlapping manner such that two neighbouring welding beads (4) comprise an overlapping volume (5) and a non-overlapping volume (6), the overlapping volume (5) being an intersection volume between the two neighbouring overlapping welding beads (4), and the fraction of carbide material being higher in the overlapping volume (5) than in the non-overlapping volume (6) such that the overlapping volume (5) has a higher wear resistance compared to the non-overlapping volume (6) having a lower wear-resistance. Also the invention relates to a method of forming such a wear surface on a roller body (2).


Described is a roller (1) for crushing of particulate material, such as crude ore for use in the mineral industry, where the roller body (2) is provided with a plurality of individual wear segments (4, 5) which are arranged on longitudinal guiding means (6) and between clamps (7, 8) in a manner such that two or more of the wear segments (4, 5) are fixed to the same lateral section of one lateral portion of the roller body (2) and such that the frequency of, and cost associated with, the replacement of such wear segments is minimized. The invention also relates to the plurality of wear segments and to a method of manufacturing the roller.


Patent
FLSmidth, Inc. | Date: 2017-05-10

Bulk store for storing bulk material in a pile (2) and reclaiming bulk material from the pile, and comprising -a bulk storing area (1) being laterally delimited by a longitudinally extending delimiting wall (3) - -a bulk material reclaiming device (8) of the side scraper type comprising a pivotally mounted scraping jib (19) being pivotal about an essentially horizontal pivot axis (20) for reclaiming material from the pile, the reclaiming device (8) being movable along a first and a second mutually parallel track (12;13) being parallel with the wall (3) and being provided with first wheel means (15) for travelling on said first track and second wheel means (16) for travelling on said second track, the first track being arranged closer to the wall than the second track, and -a belt conveyer (11) arranged between the first and second track (12;13).


Patent
FLSmidth, Inc. | Date: 2017-01-25

Filter bag assembly for use in cleaning of process gas comprising an outer tubular filter bag and one or more inner tubular filter bags separately arranged within the outer tubular filter bag, and said one or more inner tubular filter bags also separately arranged within each other, the one or more inner tubular filter bags and the outer tubular filter bags having an open end and a closed end, and at least one of the inner tubular filter bags and/or the outer tubular filter bag being provided with catalytically active material.


A high voltage power supply for an electrostatic precipitator comprises a high voltage transformer, a high voltage bridge rectifier and a semiconductor switch controller configured to control an output power level of the high voltage power supply. A control unit (50) is configured to determine a firing angle of firing pulses for the semiconductor switch controller. During normal operation, a peak voltage value is measured and stored in each half period. When a breakdown is detect ed, a residual voltage (Ur) over the electrostatic precipitator is measured. A firing angle (1) of a firing pulse to be provided to said semiconductor switch controller in the first half period after the breakdown is determined from the latest stored measured peak voltage value (Ubef) and the measured residual voltage (Ur) based on a predetermined relationship between the firing angle (1) and said measured voltages.


Patent
FLSmidth, Inc. | Date: 2017-01-25

A sack feeding device for a sacking machine comprising: means (21) for picking up one sack at a time from a stack of sacks arranged on a first plane (11); said sacks being elongated having two long sides (7, 9) and two short sides (6, 8), and at least one corner between a long and a short side comprising a valve (5), said long and a short side with a valve in between being referred to as a short valve side (6) and a long valve side (7); means (32, 34) for pushing one sack at a time so that said long valve side (7) is arranged on a second plane (40) and abuts against a retainer (41) and the long side (9) opposite to said long valve side (7) is contained by a vertical edge (36) opposite to said retainer (41), means (42) for pushing said short valve side (6) to a predetermined position on said second plane (40); means (46) for lifting said short valve side (6), away from said second plane (40).


Patent
Air Liquide, Lafarge and FLSmidth, Inc. | Date: 2016-06-08

Method and installation for calcining cement raw meal in a calciner (10) whereby fuel and a calciner oxidant having an oxygen content of at least 30% vol are introduced into the calciner (10) so as to generate either an oxidant-lean zone or a fuel-lean zone in the calciner located between the lowermost fuel inlet level (L13) and the lowermost oxidant inlet level (L16) of the calciner (10), between 50% and 100% by weight of the raw meal (14, 15) being supplied to the calciner (10) upstream of and/or within the oxidant-lean, respectively the fuel-lean zone.


Disclosed are novel compounds which display enhanced reactive properties due, in part, to induced lattice strain. The new compounds demonstrate accelerated leaching of copper under oxidizing conditions. The activated compounds are produced under conditions of time, temperature, Eh, and pH which retard the rate of lattice strain relaxation. Further disclosed are methods of making and using the novel compounds.

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