L David Michaud

About David Michaud

Since 1993, when he obtained his Mining Engineering Degree from Queen’s University, David has acquired experience in operating roles including many years 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/

Ferrocyanides

The study and use of ferrocyanides was initiated with the discovery of the pigment “Prussian Blue” by Diesbach in 1704. Thus, they are among the earliest commercial chemicals and have been produced in large quantities for many years. In the United States, American Cyanamid Company, with its ample supplies of cyanides

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By | 2017-06-20T09:44:41+00:00 June 5th, 2017|Categories: Cyanide Leaching|Comments Off on Ferrocyanides

Grinding Mill Surging

The phenomenon of “surging” in a mill is a subject upon which very little has been written; presumably because it is a condition which cannot be tolerated in mill operation and which must be eliminated by variation of some or many of the physical dimensions or characteristics of the mill or mill charge.  The phenomenon known as “surging”

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By | 2017-05-30T08:45:08+00:00 May 30th, 2017|Categories: Ball Mills, Grinding|Comments Off on Grinding Mill Surging

Effect of Grinding Media on Milling

In the previous chapter the influence of the various physical quantities defining the mill and mill charge has been studied in connection with the performance of a mill as a device for the creation of new surface in the powder. For some purposes, however, it is also desirable that the product should have a preferred form of size distribution curve.

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By | 2017-05-30T08:25:23+00:00 May 30th, 2017|Categories: Ball Mills, Grinding|Comments Off on Effect of Grinding Media on Milling

Ball Mills

In all ore dressing and milling Operations, including flotation, cyanidation, gravity concentration, and amalgamation, the Working Principle is to crush and grind, often with rob mill & ball mills, the ore in order to liberate the minerals. In the chemical and process industries, grinding

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By | 2017-08-17T08:37:56+00:00 February 13th, 2017|Categories: Ball Mills, Grinding|Comments Off on Ball Mills

Quantitative Chemistry Gravimetric Analysis: PRECIPITATE

WASHING THE PRECIPITATE: A precipitate may be washed directly on the filter, or it may be washed partly by decantation and partly on the filter. If by decantation, the precipitate is allowed to settle, and the supernatant liquid is poured on the filter. Wash water is added to the precipitate, and after

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By | 2017-03-17T19:06:33+00:00 January 20th, 2017|Categories: Laboratory Procedures|Tags: , |Comments Off on Quantitative Chemistry Gravimetric Analysis: PRECIPITATE

Gravimetric Analysis: Substance into Solution

Material of Vessels for Solution

The student must consider the effect of the solvent used on the vessel. In most cases the solvent used is an acid or mixture of acids, and for such solvents glass and porcelain are generally used. Platinum may be used, provided no chlorine or other attacking agent be present. (See notes regarding care and use of platinum

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By | 2017-03-17T19:06:34+00:00 January 19th, 2017|Categories: Laboratory Procedures|Tags: |Comments Off on Gravimetric Analysis: Substance into Solution

Analytical Balance

Analytical Balance Principle

In this place it will be sufficient to describe the usual chemical balance, designed to carry in each pan a load up to 100 gms. This balance can be obtained at a reasonable figure, and sensitive to 1/10 of a milligram (0.0001 gm.). In the section on Assaying the student will find two other forms—Pulp Scales and the Assay Balance— mentioned. The

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By | 2017-03-18T06:25:11+00:00 January 18th, 2017|Categories: Equipment, Laboratory Procedures|Tags: |Comments Off on Analytical Balance

Mineral Identification by Spectroscopy

FIG. 35 gives an idea of the spectroscope and of its different parts. P is a flint glass prism, having a refracting angle of 60° and resting on a brass plate fixed on a brass support, S. The brass plate carries the collimator tube C, in the end of which nearest to the prism is fixed a lens, the other end being closed by a plate

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By | 2017-03-19T09:19:19+00:00 January 11th, 2017|Categories: Laboratory Procedures, Mineralogy|Tags: |Comments Off on Mineral Identification by Spectroscopy

PREPARATION OF BASE SOLUTIONS

experiment

experiment-2

PREPARATION OF SOLUTION FOR BASES

1. Boil the finely-divided substance in distilled water.
2. If insoluble, add ¼ its bulk of strong HCl and boil for two or three minutes.
3. If still insoluble, treat a fresh portion with strong HCl and boil for five minutes ; then add an equal volume of water and warm.
The majority

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By | 2017-03-17T19:06:45+00:00 January 11th, 2017|Categories: Laboratory Procedures|Tags: |Comments Off on PREPARATION OF BASE SOLUTIONS

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