About L D Michaud

Since 1993, when he obtained his Mining Engineering Degree from Queen’s University, David has acquired experience in operating roles including many years’ experience in post-commissioning operations troubleshooting. Mineral Processing and Metallurgy has become a core strength and passion for Mr. Michaud.

Learn more at https://www.911metallurgist.com/about-us/

Factors Affecting Ball Mill Grinding Efficiency

The following are factors that have been investigated and applied in conventional ball milling in order to maximize grinding efficiency:

a) Mill Geometry and Speed – Bond (1954) observed grinding efficiency to be a function of ball mill diameter, and established empirical relationships for recommended media size and mill speed

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By | 2017-10-25T19:32:12+00:00 October 25th, 2017|Categories: Various|Comments Off on Factors Affecting Ball Mill Grinding Efficiency

Heap Leach Pad Liner: Differential Settlement & Strain Estimate

The maximum settlement (S) of the soil subbase occurs at the center of the wetted soil column. There would be little to no settlement along the dry edges of the column. The total settlement can be estimated by multiplying the percent soluble minerals times the controlling depth, DI. As the liner deflects to fill the void created by the settlement,

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By | 2017-10-23T16:42:15+00:00 October 23rd, 2017|Categories: Various|Comments Off on Heap Leach Pad Liner: Differential Settlement & Strain Estimate

Rock Crushers

Rock Crushers fill the duty of rock size reduction and can be classified in various stages of duties:

  1. Primary crushing is the first crushing stage,
  2. secondary crushing is the second,
  3. Tertiary crushing is the third,
  4. Quaternary crushing is a rare forth stage of rock crushing,

Coarse crushing includes crushing operations discharging at sizes 4- to 6-in. or coarser; intermediate crushing comprises operations taking feeds 6- or 8-in. maximum and making products down to -1/2″ or 3/8″. Fine crushing is reduction

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By | 2017-10-01T15:56:26+00:00 October 1st, 2017|Categories: Various|Comments Off on Rock Crushers

Thickener Process Control Strategy

The objectives of thickener control are varied, but in most instances, the objective is to dewater the slurry, reclaim the clear overflow for reuse in the process, and produce a thickened or more dense underflow, which can either be rejected, in the case of tailings, or used as feed for subsequent unit operations.

The general Process Control Strategy

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By | 2017-10-01T13:36:08+00:00 October 1st, 2017|Categories: Dewatering|Comments Off on Thickener Process Control Strategy

Gravity Concentrators & Jigs Compared

A Gravity Concentrator has the bed fluidized 100% of the time.A Jig is fluidized only 50% of the time.
A Gravity Concentrator works at 150 g forces.A Jig works at 1 g.
Material is caused to move in a lateral movement through the Gravity Concentrator.A Jig has a lateral movement and a vertical movement.
The Gravity Concentrator moves concentrate laterally at very near the speed of the cone and at the same time it moves the gangue being treated in a lateral vertical plane across the concentrate face.A Jig moves concentrate down into the hutch and gangue horizontally across the bed.
Gangue in the Gravity Concentrator picks up speed as it travels through the unit and the more centrifugal speed it picks up the closer it gets to the speed of the Gravity Concentrator.Materiel in a jig also picks up speed horizontally but as it does so it moves away from the speed of the jig which is zero and the faster it goes the less chance there is for concentration.
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By | 2017-09-25T07:31:16+00:00 September 6th, 2017|Categories: Gravity Concentration|Comments Off on Gravity Concentrators & Jigs Compared

Merrill Crowe vs Carbon

merrill crowe vs carbon

Several economic comparisons have been made between carbon systems and Merrill-Crowe systems. One of these, a systematic comparison completed by DeMent and King (1982) is summarized below.

Five separate conventional mills involving both Merrill-Crowe and the CIP processes were compared from an economic viewpoint. The gold concentration on the

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By | 2017-09-04T14:05:54+00:00 August 16th, 2017|Categories: Gold Extraction|Comments Off on Merrill Crowe vs Carbon

Downdraft Tables

downdraft tablesAs well as metal working, welding or cutting, downdraft tables are also used for human dissection tables although rim exhausts are usually used for this purpose. For manual shoe repair and during application of artificial fingernails, downdraft tables are the only type of exhaust possible.

Larger versions are used for sanding, grinding, polishing,

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By | 2017-08-13T01:32:40+00:00 August 11th, 2017|Categories: Reagents and Chemicals, Tools of a Metallurgist|Comments Off on Downdraft Tables

Placer Mining Equipment for Sale BC

Deciding to invest in, buying and mobilise small-scale Gold Placer Mining Equipment BC requires professional, experienced evaluation. The essential criteria should be examined at the outset to see if the given parameters of size and tenor fit. Second, no final decision to mobilize the placer mining equipment should be made until

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By | 2017-08-28T20:39:05+00:00 August 2nd, 2017|Categories: Gravity Concentration|Comments Off on Placer Mining Equipment for Sale BC
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