This is usually a dry operation, which involves breaking down the ore by compressing it against rigid surfaces or by impacting it against hard surfaces in a controlled motion flow. Tailings are usually not generated in this process step. This process step prepares the ore for further size reduction (grinding) or for feeding directly to the classification and/or concentration separation stages.Crushing is the first stage in the small scale modular gold recovery plant comminution process. Typical types of crushers are: jaw crushers; gyratory crushers; cone crushers; roll crushers; impact crushers.
To also make use of the smaller stone size fractions Maerz developed the "sandwich charging method" where smaller and larger fractions are charged in layers allowing stone size ratios of up to 1:6.
we have dry type and wet magnetic separator like magnetic drum, dry magnetic separator, wet magnetic separator, high intensity magnetic separator.The magnetic separation is not only widely used in the concentration processing for magnetite,, hematite, copper ore , but also used for iron removal operation in the coal, nonmetalliferous ores and construction materials etc.
1. 1. The same control may, for instance, consist of the adjustment motor 115 being instructed to turn the case 107 in order to alter the width of the gap 106.(Powavg(Δt)), can be calculated for the measured power during a time interval Δt. 6, is to measure a mechanical stress or tension by means of a strain gauge 113, which, for example, may be placed on the machine frame 116 as illustrated in FIG. Hence, based on the measured power, and in a similar manner as has been described hereinbefore with reference to FIGS. 1-5, the average power value, Powavg(Δt), and the deviation value of the power, such as the standard deviation value of the power, s.A transducer 112 is operative for measuring the instantaneous power generated by the motor 110. 6. The measured power will be related to the stresses to which the crusher is exposed, and may be utilized as a parameter being representative of these stresses.1. It is also possible to alter the supply of material, the number of revolutions of the motor 110 and/or the stroke of the shaft 101 in the horizontal direction. A peak stress value may then be calculated in a similar manner as has been described hereinbefore with reference to eq.e.1., in a similar manner as has been described hereinbefore concerning eq.d. Depending on said comparison, the load on the crusher is controlled. Then the control device 111 compares the calculated peak power value Powpeak(Δt) to a power reference value Powref. Then, a peak power value Powpeak(Δt) is calculated as the sum of the average power value multiplied by a first constant and the standard deviation value multiplied by a second constant, i. The strain gauge 113, which measures the instantaneous stresses in the part of the frame 116 to which it is attached, is suitably placed on a location on the frame 116 which gives a representative picture of the mechanical stresses on the crusher. An alternative method to control the crusher of FIG.
All parameters entered are measurable. The methodology used the cost-benefit analysis, with some specificities compared to the classical model, due to the interdisciplinary characteristics of the problem faced.
This research was funded by “the National Key Research and Development Plan of China, grant number 2017YFC0307300”, and partly supported by “the National Natural Science Foundation of China, grant number 41877185” and “the National Natural Science Foundation of China, grant number 41772247”.
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