US4945772A - Method of roll nip load measurement - Google ...
More than one such load cell may be distributed along the roll length. FIGS. 2, 3 and 4 illustrate the load cell 30 construction as comprising a pair of ramp plates 31 and 32. Each ramp plate includes along respective lateral edges, a pair of tapered rails 33 having hard, smooth, straight edge surfaces 34 at a low plane angle, 5° for example ...
programa.gecamin
(ENG) Monitoring the SAG Mill Load along the Length of the Mill Jacques Olivier, Eugene Davies, Molycop, Australia; Mark Atta-Danso, Westgold Resources, Australia; and Chris Aldrich, Western Australian School of Mines, Curtin University, Australia
SAG Mills Load Cells - Grinding & Classification Circuits ...
The control of a SAG circuit can be more useful with load cells, but you also could benefit from knowledge of charge movement as well to get a better …
A thesis submitted for the degree of Master of Philosophy ...
Figure 2. Grindcurve for high aspect SAG mill (Powell and Mainza, 2006).....9 Figure 3. Effect of mill speed on mill throughput (Meaders and MacPherson, 1964).....10 Figure 4. Filling as a function of load cell reading for new and fully worn lifters (van der
Measure Force Measurement
Rock-solid load cells The Millmate Roll Force load cells act as integral parts of the mill stand. The rock-solid Pressductor load cell design in combination with the intelligent, reli-able communication functions are cru-cial keys to true roll force measurement. The Millmate Roll Force System consists of a Millmate Controller and two load cells ...
Fine Grinding Technology
milling of SAG mill products to fi ne and ultra fi ne regrinds. Inorganic Chemicals Flame retardants such as ATH, pigment bases such as TiO2, and other materials used in ceramic and refractory products. Geopolymers Cement substitutes A KAD 800 Mill can be supplied for customer site tests and/or as a modular pilot plant to produce commercial
What is the difference in load cells
load cell must be measured and adjusted to be within a tight tolerance for each unit produced. This is often referred to as "matching the mV/V output" of the load cell to others of the same model produced. The process of matching load cell outputs involves measuring the output and applying correction resistors. The objective is to have the
Datasheets | BLH Nobel
Datasheets. 125 Pocket Calibrator () 304A, 306, 308 (Summing Units, Extension Boxes, and Cables) 325 (Precision Calibrator) 625 (Precision Calibrator) Alpha Load Beam (Hermetically Sealed Bending Beam) AST 3P (Transmitter) Batch View (PC Software BatchView) BLH Nobel-1756-WM (Dual-Channel Plug-In Weighing Module)
(PDF) Developments in the understanding of South African ...
Adjusting the SAG mill model The current JKMRC SAG mill model has a linear relationship between load and grinding rate, which fits weIl to load conditions below 25-30% filling. To modify the model so that it will correctly describe the response of the mill over an extended load range it was decided to look at how the energy might be being ...
Comminution service offering Minerals Processing Division ...
AG/SAG Milling Pilot: § Mill dimensions: Diameter: 1.7m x 0.6m length § Typical throughput 0.5 -3.5 t/h depending on ore characteristics and circuit configurations § Feed system allowing accurate reconstitution of feed size distribution to the mill § Accurate measurement of feed rate, reciculatingload to the mill, charge holdup and mill power
Load Cell Installation Guide - McLean Scale
Load Cell Bolt Torque Values..... 1-23 Wind and Seismic Effects on Vessel Stability ..... 1-24. SYSTEM DESIGN 1-2 Bulk Material Weighing Systems Custody Transfer Weighing bulk material on a truck scale is a typical example of custody transfer …
Systems for smooth operation Tensioning devices and guides
load cell with integrated amplifier and filter is also hugely advantageous to the function of the fabric tensioner. Your benefits + Reliable and exact fabric tensioning + Compact load cell design + Redundant signal for fabric tension measurement + No vibrations. 10 7 8
Grinding Mill - an overview | ScienceDirect Topics
Control loop of SAG mill The main sensors are: 1. load cell for mill weight, 2. power measurement (ammeters, voltmeters), and 3. density gauges (γ-ray density gauge) for on line, non-invasive, measurement of slurry densities. Level 2 The function of Level 2 is to stabilize the circuit and to provide the basis of optimizing function in Level 3.
(PDF) Plant Experiences on Expert Supervisory Control of ...
The inferential models could be utilised in a SAG mill load control strategy, as a measure of SAG mill performance, as an indication of the primary grinding circuit operating conditions, or, any ...
Load Cell | Load Sensor | Load Measurement | HBM
Load Cells from HBM: Always the Right Solution for Your Application. HBM weighing technology is synonymous with precision, safety, dependability, and quality. The brand stands for innovative capacity as well as flexible and cost-effective solutions that meet virtually any customer requirement. We are also committed to the promotion and ...
Semi-autogenous mill power prediction by a hybrid neural ...
There are few methods of semi-autogenous (SAG) mill power prediction in the full-scale without using long experiments. In this work, the effects of different operating parameters such as feed moisture, mass flowrate, mill load cell mass, SAG mill solid percentage, inlet and outlet water to the SAG mill and work index are studied. A total number …
Automated SAG Mill Speed Control Using On-contact ...
The two main variables for controlling the SAG mills are feed and speed. Feed is presently controlled automatically via an expert system that adjusts the amount according to readings taken off of multiple bearing pressure load cells on each mill. Speed control was initially desired to be
SAG Mill Grinding Circuit Design - 911metallurgist
Mill operating conditions including mill speed (for circuits with variable-speed drives), density, and total mill load; The effect of feed hardness is the most significant driver for AG/SAG performance: with variations in ore hardness come variations in circuit throughput. The effect of feed size is marked, with both larger and finer feed sizes ...
Studies Show Snags to Mill Optimization | E & MJ
"The ball mill is 3.20 m diameter and 4.88 m long," the study said. The discharge typically contains "negligible +12.7-mm material." At the time, "tonnage was 45 metric tons per hour (mt/h), and mill power draw was 709 kW," the study said. "Approximate circulating load was 550%."
Which System to Choose for Your Application
high deflection, it can sag and throw the load onto the two adjoining cells, possibly overloading them. It is a simple but critical process to shim the load cells or, if equipped, fine-tune the adjusting bolts on the cell mounting hardware during installation to balance the four legs. Proper load sharing should
INFERENTIAL MEASUREMENT OF SAG MILL PARAMETERS IV ...
SAG mill powerdraw [kW] SAG mill load cell [t] Cyclone feed water addition [m 3/hr] Cyclone feedrate [m /hr] Cyclone feed density [% solids w/w] Oversize c rusher feedrate [t/hr] Ore is fed to the SAG mill for primary grinding. The mill discharge is screened with the oversized material
Live Streaming - Gecamin, Chile :: - Home
(A21) Analysis SAG Mill and Ball Mill´s Comminution in Peru With ME Elecmetal Grinding Media Javier Zela and Percy Jimenez, ME Elecmetal, Peru (A09) Accurate and Reliable Online Calculation of the Internal Load and % of Balls in a SAG Mill
Coarser Grinding: Economic Benefits and Enabling
SAG mill optimization has recently been explored in detail showing that optimizing the operator imposed conditions of Load Cell (% charge filling), bearing pressure, mill speed and mill discharge density (% solids) can result in very significant
ONLINE SAG MILL PULSE MEASUREMENT AND …
ONLINE SAG MILL PULSE MEASUREMENT AND OPTIMIZATION SEMI ... Figure 5.8 Load cell package attached to the mill.....47 Figure 5.9 Groove in the lifter.....47 Figure 5.10 Stud cap exposed inside the mill.....48 Figure 5.11 Comparison of Impact spectra with mill speed at 15% mill filling and 1.5 ...
SAG Mill Ball Sizing - Grinding & Classification Circuits ...
If you have a good quality load cell installed on your mill and it is well calibrated then you have a good idea of what the total charge is. This is the parameter that changes constantly during operation of the mill. And it is mainly due to the change in ore charge. In the short term (day or two) ball charge should not change too much.
AUTOMATION ADVANCED CONTROL EXPERT (ACE)
Los Pelambres, as at many mines, SAG mill throughput was limiting overall production. CONTROL OBJECTIVES • Maintain the desired mill load, ensuring optimal mill operation • Automatically account for changes in ore hardness • Provide optimal compensation for pebble mill distur-bances to minimize production disturbances
ONLINE SAG MILL PULSE MEASUREMENT AND …
An instrumented load cell package that can measure the force of impacts inside the grinding chamber of a mill is developed here. The signal from the instrumented load cell package is interpreted in terms of a histogram termed as an impact spectrum which is a plot of the number of impacts at a specific energy level against the energy.
Why Is My Load Cell Inaccurate? 11 Problems and Solutions ...
Traditional load cells are built using strain gauges, which are delicate metal pieces. Dramatic temperature changes will affect the function of the strain gauge, and therefore the load cell. If the load cell is exposed to cold nights and then hot, direct sunlight, or surrounding equipment heats up the area, this can cause inaccuracy.
SAG Mill Control: It Shouldn't be that Hard | E & MJ
SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells.
Online SAG Mill Pluse Measurement and Optimization ...
The load cell package was successfully used to produce impact spectra in an 8.5 inch lab scale mill. The mill speed and the ball size were varied to study their effect on the impact spectra. A good correlation was found between the process variables and the impact spectra. The load cell package was then used in a 16 inch pilot scale mill.
Bearing pressure to mill load control - Grinding ...
How can i control mill load with Trunnion bearing pressure ? We have faulty load cell in our SAG mill. We have previous relation trends when load cell was working fine. We need to develop relationship formula . Please assist me.
Industrial Solutions Autogenous,
Depending on the expected load, the mill is equipped with either hydrodynamic or hydrostatic sliding ... dation settlement or to install or remove bearing shoes without complicated supporting of the mill shell. Load cells in the base of the bearing allow the mill weight to be recorded. ... SAG and ball mill for the wet grinding of gold/copper ...
What's the Difference Between SAG Mill and Ball Mill ...
The biggest characteristic of the sag mill is that the crushing ratio is large. The particle size of the materials to be ground is 300 ~ 400mm, sometimes even larger, and the minimum particle size of the materials to be discharged can reach 0.1 mm. The calculation shows that the crushing ratio can reach 3000 ~ 4000, while the ball mill's ...
Major Mines & Projects | Don Mario Mine
Dry crushed ore at P80 90 mm is fed to the SAG mill (5.5 m internal diameter by 2.7 m effective grinding length) by means of a conveyor belt equipped with a load cell type belt weightometer. The load signal controls the feed rate from the mill feed bin discharge conveyor onto the conveyor belt feeding the SAG mill.
Donut Load Cells | Through Hole Load Cell | Thru Hole Load ...
Model LTH300 is a Donut Load Cell built for Press, or Inline compression applications. The standard LTH300 Donut Thru Hole Load Cell model has a very robust construction available in 17-4 SS, with an I.D. range of 1/8" to 3/8" and a 10 feet long Teflon cable.
the effect of circulating load on sag mill power
The rock load in the mill essentially depends on ore characteristics and the ... circuit with classifiers whose circulating loads reach as high as 400-500%. ... grinding, flow-back can make a significant impact when the mills are operated in ... the load inside the mill increases and the mill draws more power.
SAG Mill Control: It Shouldnt be that Hard
SAG mill control fundamentally means managing the load in the mill by adjusting the feed rate of ore to the mill and/or manipulating the rotational speed of the mill. The best way to measure load is to mount the mill on load cells.
SAGMILLING .:. Articles
Testwork template spreadsheet. Blank spreadsheet that is pre-populated with the field names needed to import laboratory test results into the SAGMILLING circuit model testwork database (subscription required). Enter your test results, one per row, arranged into the columns indicated. To import into your testwork database, copy the block of ...
(PDF) Understanding the effects of liner wear on SAG mill ...
8 - 9 August 2011 Perth, WA. Fig. 1- Increase in throughput over liner life for a large SAG mill. Unfortunately however, the 32 ft SAG mill that was studi ed for this project does not feature ...
3BSE043764R0101 RevC Millmate Looper Tensiometer Systems
The Looper Tensiometer load cell is used for strip tension measurement in hot rolling mills. The load cell can be installed as an integrated part of the looper arm and senses the force from strip tension in both directions. The load cell comes in one version, PFTL211-CE, a mill-duty version with fixed connection cable