High Pressure Grinding Rolls for Zinc and lead ores ...
We are using SAG and ball mills for grinding zinc lead ore. I want to know about the possibility of replacing the same with High Pressure Grinding Rolls (HPGR)s. Would the replacement require any changes in the plant design. What would be the feasibility of the same in long run? What points should b
The present invention provides for pulsed powered drilling apparatuses and methods. A drilling apparatus is provided comprising a bit having one or more sets of electrodes through which a pulsed voltage is passed through a mineral substrate to create a crushing or drilling action.
Used High Pressure Equipment for sale. Cincinnati ...
Parr Instruments 452HC3 600ml 3000psig Pressure reactor. EquipX inc Capacity 600 ml material grade Stainless Steel high pressure max 3000 psig at 350 C. $2,950. San Jose, CA, USA.
The Coalition for Energy Efficient Comminution (CEEC) has been established and is supported by a broad range of mining sector companies keen to accelerate awareness, knowledge transfer and, by implication, improve energy and cost outcomes in the substantive area of comminution.
Building the Pamir‐Tibetan Plateau—Crustal stacking ...
We fragmented samples either by high-voltage discharge employing the Freiberg SELFRAG® facility or by jaw crusher. Mineral concentrates were enriched by magnetic separation, wet and dry shaking tables, heavy liquids, and by handpicking. 3.2 40 Ar/ 39 Ar and K-Ar Analysis
Mineral Liberation of Magnetite-Precipitated Copper Slag ...
· High-Voltage (HV) Pulse Comminution. The HV pulse comminution equipment used in the present study was manufactured by SELFRAG TM. A schematic of the equipment is shown in Figure 1. The equipment consisted of an HV power supply, pulse discharge generator, portable process vessel, and …
YGMX(O) ultrafine grinder site in Lebano_ Heavy ...
This production line consists of jaw crusher, electromagnetic vibration feeder, high-pressure micro powder mill, elevator, electric control cabinet, pulse dust catcher, etc. It has the characteristics of a high degree of automation, high pro
An electrifying idea
· Selfrag AG has completed the pilot-scale engineering for an ore pre-treatment system that could lower the power draw of comminution by double-digit percentages. Using electric pulse fragmentation to weaken ore before it enters the milling circuit can speed up the grinding process and improve liberation results, according to research conducted ...
Rock Boulder Exploding Techniques
· The spark method of rock breaking has great potential in deep hole drilling, but as yet to be tested for boulder breaking. Flame Jet. A flame jet is a rock cutting method which uses a high-velocity flame powered by air or oxygen enriched air oxidized with fuel oil, as shown in Figure 31 (Maurer, 1979).
SELFRAG Rod Crusher
The SELFRAG Rod Crusher is specifically designed to fragment mono or poly-crystalline silicon for the solar and semiconductor industry with virtually zero contamination. Our unique non-contact crushing provides rapid size reduction and preserves the chemical purity of your material, making it perfect for high …
Pre-weakening of mineral ores by high voltage pulses ...
· The high voltage pulse breakage experiment was conducted with a selFrag Lab machine, manufactured by selFrag AG based in Switzerland. The name of selFrag refers to selective fragmentation. The equipment consists of a high voltage (HV) power supply, HV pulse generator, portable process vessels and a lifting table for easy loading and unloading ...
MARC Technologies » Crushing Systems – Jaw & Cone
MARC supplies a range of Jaw Crushers & Jaw Crusher Systems (Rocklabs, TM Engineering, FL). We also design and manufacture cost effective rotary sample dividers to suit many jaw crushers. Contact us to discuss your crushing needs. Rocklabs Boyd Crushers with Rotary Sample Dividers (Left or Right Feed). Wescone Cone Crushers mounted into ...
Investigation on pre-weakening and crushing of phosphate ...
· High Voltage Electric Pulse Crusher (HVEPC) The pulse generator as a standard electrical device which was capable of generating high voltage pulses and comparable with that of natural lightning came into the existence at the end of 19th century . Nicolas Tesla used a coils resonant transformer circuit for the wireless transfer of electrical ...
Miscellaneous Patents and Patent Applications (Class 241 ...
Abstract: According to a method for fragmenting of pourable material by high-voltage discharges, a material flow of the material, immersed in a process liquid, is guided past an electrode assembly by a conveying device carrying the material flow. By charging the electrode assembly with high-voltage pulses, high-voltage punctures through the material of the material flow are produced.
MEI''s Barry Wills: European Symposium on Comminution and ...
· The 13th European Symposium on Comminution and Classification (ESCC ''13) was held from September 9th-12th at the Steigenberger Parkhotel in Braunschweig, an old German city south of Hamburg, with a long international history and the highest density of researchers in Europe was held immediately following a workshop of the International Comminution Research Association (ICRA) and …
By Operations Other Than Force Of Contact With Solid ...
Abstract: The invention provides a combustion process using comminuted fuel solids from a steam-driven shear field, with controlled water content and optionally coated with a combustion catalyst. The method allows fuel solids to burn for energy production at low temperatures. The lower temperatures avoid emissions of nitrogen oxides, and the process also yields a clean, friable ash that has ...
US4313573A US06/124,480 US12448080A US4313573A US 4313573 A US4313573 A US 4313573A US 12448080 A US12448080 A US 12448080A US 4313573 A US4313573 A US 4313573A Authority US United States Prior art keywords ore discharge shock sample microfractured Prior art date 1980-02-25 Legal status (The legal status is an assumption and is not a legal conclusion.
Applications Of Mechanical Breakage In Mining As A Rock ...
Experimental and Numerical Study of Rock breakage by2.22 Мб. Extending the use of high-pressure water jets to breaking hard rock in surface and underground mining applications still requires significant improvements in jet cutting or jet breakage performance.This is a key factor that has limited the wider uptake of pulsed jets as a rock-breakage method.
US3208674A US146307A US14630761A US3208674A US 3208674 A US3208674 A US 3208674A US 146307 A US146307 A US 146307A US 14630761 A US14630761 A US 14630761A US 3208674 A US3208674 A US 3208674A Authority US United States Prior art keywords rock fragmentation electrical energy current conductive Prior art date 1961-10-19 Legal status (The legal status is an assumption …
The effects of electrical comminution on the mineral ...
· To date research on high voltage pulse treatment, using the SELFRAG device, has focused on the development and simulation of SELFRAG within comminution circuits, where the device is used to replace a comminution device or it is added as a pre-treatment stage (Cho et al., 2006, Wang et al., 2011, Wang et al., 2012a, Wang et al., 2012b, Shi et al ...
PROCESS FOR THE PREPARATION OF FRAGMENTED NATURAL …
1. Process for the preparation of fragmented natural calcium carbonate with a reduced content of impurities comprising the following steps: i) providing at least one natural calcium carbonate and impurities containing material, ii) optionally crushing the material of step i), iii) providing an aqueous solvent, iv) contacting the crushed material of step ii) or the material of step i) with the ...
MEI''s Barry Wills: September 2013
· A history of 21st Century mineral processing, with occasional forays into travel and Cornwall. The opinions are solely those of MEI''s Dr. Barry Wills, Editor-in-Chief of Minerals Engineering, recipient of the IMPC Distinguished Service Award (2014), IOM3 Medal for Excellence (2017) and honorary professorship from Central South University, China (2018).
Minerals | Free Full-Text | Methods of Ore Pretreatment ...
A high pressure is also built up within the rock matrix, such that the tensile strength of the rock is exceeded (electrical disintegration (ED) method). This pressure occurs as a result of the change of state (from solid to gas) of some particles within the rock when the electric current passes through the rock …
Assessing the amenability of a free milling gold ore to ...
· Samples of the minus 30 mm feed to the plant were crushed in the laboratory using a cone crusher, SelFrag®, a vertical shaft impactor (VSI) and a high pressure-grinding roll (HPGR) with a resulting product of P 100 – 2 mm. The crushing modes were selected for both research and site interest.
Professor Frank Shi
High voltage pulse-enabled coal desulfurization and deashing – Part 1: Selective breakdown of mineral matter. Fuel, 300 120970, 1-8. doi: 10.1016/j.fuel.2021.120970. Conference Publication: Factors influencing ore breakage in high voltage pulse pre-treatment. Lay, Daniel, Shi, Fengnian and Antonio, Christian (2021).
selFrag-Lab Laboratory Fragmentator
~ 500 ns Pulse Rise Time Explosion Compression Oil Discharge Voltage Solids 0 Figure : Breakdown strength of various materials as a function of the pulse rise time Municipal waste incineratior slag treated 1 0 seconds in a selFrag-Lab, demonstrating the high degree of selectivity of the process.
Journal of Natural Gas Science and Engineering
Pore pressure was provided by helium gas which measured permeability and pore volume. 2.2. Mercury injection capillary pressure (MICP) Capillary pressure measurements were performed on 30 sam-ples from Lance and Mesaverde formation. After degassing intact rock chips at 200 C for 12 h, mercury was injected into samples at pressure steps from0 ...
Cone Crusher 911Metallurgist. A study was made which considered a plant to be built using three different approaches of a conventional crushinggrinding operation The plant which was being considered would be crushing taconite similar to that found in the Iron Range The end product of the crushing was 5/8″ rod mill feed and in this example the plant capacity was to be
MEI''s Barry Wills: Comminution: developments and thoughts ...
· An article from Weir Minerals suggested that there was an increase in demand for larger cone crushers that are matched with large high pressure grinding rolls for customers who want to replace SAG mills in order to increase efficiency. Utilising cone crushers and HPGRs allows ore to be processed from 250mm to 50mm in cone crushers, then down to ...
crushing of useful minerals
Introduction. We are a professional mining machinery manufacturer, the main equipment including: jaw crusher, cone crusher and other sandstone equipment;Ball mill, flotation machine, concentrator and other beneficiation equipment; Powder Grinding Plant, rotary dryer, briquette machine, mining, metallurgy and other related equipment.If you are interested in our products or want to visit the ...
Pressure pulse fracturing system EP3620605A2 (en) 2004-08-20: 2020-03-11: Sdg, Llc: Pulsed electric rock drilling, fracturing, and crushing methods and apparatus US8172006B2 (en) 2004-08-20: 2012-05-08: Sdg, Llc: Pulsed electric rock drilling apparatus with non-rotating bit US8186454B2 (en) 2004-08-20
The present invention concerns a process for the preparation of fragmented natural calcium carbonate with a reduced content of impurities by use of a high voltage fragmentation apparatus, as well as products obtained thereof and their use. Furthermore, the present invention refers to the use of a high voltage fragmentation apparatus and a separation step for reducing impurities in at least one ...
Control Of Air Emissions From Process Operations In The ...
EPA-340/1-79-002 CONTROL OF AIR EMISSIONS FROM PROCESS OPERATIONS IN THE ROCK CRUSHING INDUSTRY by JACA Corp. 550 Pinetown Road Fort Washington, PA 19034 EPA Project Officer: Norman Edminsten Region X Enforcement Division Contract No. 68-01 -4135 Task No. 19 Prepared for U.S. ENVIRONMENTAL PROTECTION AGENCY Division of Stationary Source …
Selfrag LAB | Selfrag | Labratory Equipment | AfriFusion ...
The SELFRAG Lab is a laboratory scale solution for selective fragmentation. The Lab uses a SELFRAG high voltage pulse power generator to fragment batches of material and liberate individual components from the whole, whether rock or electronic waste. The Lab is self-contained, compact, and constructed in Switzerland to meet all EU health and ...
Experimental and numerical analyses of electro-pulse rock ...
· The high-voltage short-pulse power supplies used in electro-pulse rock and ore breaking are mainly a high-voltage pulse selective sample breaking instrument made by selFrag AG in Switzerland. The high-voltage pulse power supply developed for this instrument can produce a voltage of 90–200 kV at a maximum output current of 22 kA and pulse ...
Research and Applications of High-voltage Pulse Discharge ...
· The HVPD rock crusher developed by Karlsruhe research centre has already been sold worldwide. The HVPD crusher produced by Selfrag AG, a swiss company, produces high voltages between 90 and 200kV. The Selfrag HVPD pre-weakening test …
The invention relates to a method for producing a highly pure quartz granulate. The aim of the invention is to provide a method by means of which a highly pure quartz granulate can be produced from a natural quartz raw material. According to the invention, this aim is achieved by a method in which the following process steps are performed: - washing a natural quartz raw material in the form of ...
COMMINUTION: Liberation, Crushing, Grinding
· Crushers such as; jaw, gyratory, cone, high pressure roll and impact crushers are available. Grinding or milling is usually performed wet and dry grinding has limited applications.
Comparative Laboratory Studies of Conventional and ...
· To demonstrate the benefits of pre-weakening by high voltage pulses to the mineral industry, to treat larger particles and to use more flexible operation settings, a pilot scale Pre-Weakening Testing Station (PWTS) was developed by SELFRAG AG (SELFRAG) and used to further characterize pre-weakening by high voltage pulse treatment [3, 12].
Electrohydraulic Fragmentation of Aluminum and Polymer ...
Industrial WPB samples were fragmented using high-voltage pulse power laboratory fragmentation (selFrag-Lab, Switzerland). The WPB as-received samples were placed in a 2 L capacity vessel and then filled completely with tap water (∼2 L). In each experiment, 20 g of sample was used for fragmentation.
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