We sincerely welcome you to contact us through the hotline and other instant messaging methods. Whether it's project consultation or feedback, we will serve you in the fastest way and spare no effort to save time for customers.
OBORTS Company, Opposite the residence of old General Mambou, Near Dragage, Bastos, Yaoundé, Cameroon
Email: [email protected]
The standard pebble-crushing circuit recycles crushed pebbles back to SAG m ill. Throughput can be maximised by crushi ng to a size finer than the trommel or SAG discharge screen.
Jan 01, 2005· The last major decision for a pebble-crushing circuit is where to put the pebble-crusher product. Conventionally, crusher product was returned to SAG feed. Some designs, however, now allow pebble-crusher product to be returned to the SAG screens/discharge (allowing operation of the pebble crusher in closed circuit) or even to the ball-mill circuit.
Primary and Pebble Crushing Circuit. Project Summary. Ore Type: Gold. Duty: ROM Ore Primary crushing and Pebble crushing circuit complete with interconnecting equipment. Location: Cambodia. Capacity: 2.0 MTPA. Scope. 1 off ROM Bin. 1 off AF1512 Apron Feeder.
The model was a critical tool for the success of the project. It was leveraged for several uses, including safety and constructability reviews with key project stakeholders and the development of a sequenced demolition and construction plan for tying the new system into the existing pebble crushing circuit.
Sep 05, 2019· First, a quick overview of why a dedicated pebble crushing circuit is so important. The challenges of pebble crushing Ranging in size from 25-90mm, pebbles are oversized material produced from autogenous and semi-autogenous grinding, which are too coarse to be crushed by larger lumps of ore and steel balls and too fine to act as grinding media
The pebble crusher was reduced in size and the pebble bin capacity was increased to allow for a more consistent flow into the pebble crusher. Uncrushed pebbles were returned directly to the SAG mill, bypassing the pebble crusher, to further improve circuit efficiency.
between the SAG mill and the pebble crusher in a closed circuit and thus to optimize the circuit efficiency by controlling the pebble crusher operational settings. In this thesis, two modeling techniques are proposed for simulating the dynamics in the grinding process. The first method is the fundamental modeling method, where the underlying
Dec 02, 2016· The pebble crusher had an over-powered configuration. The installed power draw of 630 kW (actual power draw of 213.5 kW) is over-sized and therefore had a low operation efficiency. The crusher remains operational intermittently, which means it is not possible to continuously Figure 1. Wushan Phase I SABC circuit layout and equipment
Feb 05, 2019· Pebble crushing by Cone and subsequent HPGR in closed circuit (with e.g. 6 mm screen aperture), product forward ed to downstream ball mill discharge pump sump.
One is the crushing circuit where companies have observed damage to crushers, unscheduled downtime and loss of production. Grinding ball fragments, for example, can cause damage to a cone crusher mantle. However, in a pebble crusher application, the majority of the metal is typically minus 4–5 in. To effectively separate of +1/2-in
the crusher is in open circuit, eg pebble crusher in a AG/SAG circuit, K. 2. takes the value of 1.19. x. 1 = P. 80. in microns of the circuit feed . x. 2 = P. 80. in microns of the circuit product . M. ic = Crushing ore work index and is provided directly by SMC Test ® The coarse ore hardness parameter (S) makes allowance for the decrease in
circuit (crushing, stockpiling and grinding) representing 35% and 50% of plant capital cost for the 1 Mt/a and 20 Mt/a plants, respectively. Pebble crushing impacts on SAG mill operation AG/PC circuits require good control systems Suitable Pebble management an issue. Requires complex circuit
Jul 19, 2018· The crusher bypass belt is used to allow circuit operation when the crusher is down for repairs. This has allowed the circuit to be studied with the crusher excluded from the grinding circuit. Due to critical size pebbles in the circuit, operation without the crusher …
Jan 01, 2009· Pebble recycle crushing circuit performance at Telfer has historically fallen significantly short of the design product P80 of 12 mm. An investigation was undertaken to evaluate the current pebble crusher circuit performance, quantify the optimum performance achievable with the existing circuit and examine the impact of pebble crusher performance on the overall grinding circuit …
The pebble crushing system was also dynamically controlled to cater for the variable feed by running the crusher at variable speeds from a VFD. This had not been done before on a pebble crushing application. This plant was also decoupled from the SAG circuit so that any problems with the Pebble Crusher would not trip the SAG Mill.
Jan 01, 2016· For these ore types, a pebble-crushing circuit is an imperative for efficient circuit operation. Currently, every AG/SAG flowsheet evaluation is likely to consider the inclusion of a pebble crusher circuit. Flowsheets that do not elect to include pebble crushing at construction and commissioning may include provisions for future retrofitting a
Full Scale Test Circuit Based upon the results of the pilot plant test work, a decision was made to conduct a full scale test in 1990 utilizing one of the ten (10) primary mill lines at the National Steel Pellet Plant. Primary Mill Line No. 10 would be converted to a fully autogenous grinding mill with pebble extraction and crushing. Engineering and installation of the test circuit …
The scope of this thesis is to examine the dynamic relations between the SAG mill and the pebble crusher in a closed circuit and thus to optimize the circuit efficiency by controlling the pebble crusher operational settings. In this thesis, two modeling techniques are proposed for simulating the dynamics in the grinding process.
Sep 05, 2019· Whether recirculated through primary milling or separated and sent to a dedicated downstream pebble mill, pebble crushing is an energy-intensive operation …
Alternatively, a conveyor system can be used to recirculate the pebbles back to the mill-feed conveyor. If a conveyor system is to be used, it is often wise to make allowance for a future pebble crusher by building in extra height. • If the pebbles are coarse and of significant grade, a pebble crushing circuit …
full) pebble crushing, the circuit throughput was increased to 320tph. The pebble crusher has also added another control option for keeping the circuit throughput stable during variations in feed ore hardness and size. After confirming the positive effect of the pebble crusher on throughput, a permanent HP300 pebble crusher was installed.
Sep 05, 2019· First, a quick overview of why a dedicated pebble crushing circuit is so important. The challenges of pebble crushing Ranging in size from 25-90mm, pebbles are oversized material produced from autogenous and semi-autogenous grinding, …
Figure 2 shows the current circuit configuration which include a double deck screen (18 mm and 5 mm aperture), and a cyclone cluster of 4 off 685 mm diameter cyclones. A pebble cone crusher is available but does not operate. The AG mills are operated in closed circuit at a nominal rate of 600 t/h
pebble crushing circuit at Cadia resulted in a throughput increase of . about 200tph during plant trials. The ability to wet s creen and ball. I-30.
the pebble crusher feed bins via the pebble crusher feed conveyor. The -4mm material flows into the common mill discharge sump. 3.2.2 Pebble Crushing Circuit Pebbles from the secondary mill pebble feed bin are withdrawn at a controlled rate by a belt feeder and delivered to the secondary mill via a pebble transfer conveyor. The rate