Blog of Mineral Processing (Metallurgy) Articles

Effect of Cupric Ammine on Gold Dissolution Rate

The dissolution of gold in ammoniacal solutions cannot take place in the absence of oxidants. Cupric ammine can act as an oxidant in this system according to Equation 3.

The effect of cupric ammine concentration on the dissolution rate of gold was investigated in a solution of 0.6 M total ammonia concentration (0.1 M (NH4)2SO4 and 0.4 M NH3). The

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By |2018-06-09T16:13:52+00:00June 9th, 2018|Categories: Gold Extraction|Comments Off on Effect of Cupric Ammine on Gold Dissolution Rate

Autogeneous Grinding VS Steel Grinding Media in Flotation

In grinding, the use of steel media in a rod/ball mill circuit clearly diminishes the subsequent froth flotation performance over purely autogenous grinding. The use of recycle water in grinding also clearly diminishes the subsequent froth flotation performance associated with fresh tap water. Some of these flotation deficiencies

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By |2018-06-08T07:57:05+00:00June 8th, 2018|Categories: Grinding|Comments Off on Autogeneous Grinding VS Steel Grinding Media in Flotation

Magnesioferrite

In the case of pellets it was observed that incremental additions of olivine to any of a series of pellet concentrates invariably caused the pellets to become progressively more ferromagnetic after induration. At first, it was assumed that what little magnesioferrite formed in such pellets stabilized magnetite, a comparable spinel structure, in solid

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By |2018-06-07T17:56:46+00:00June 7th, 2018|Categories: Various|Comments Off on Magnesioferrite

Kaolin Ceramics

clay-minerals magnetic separator

Kaolin is a clay comprised essentially of the mineral kaolinite which has the oxide composition of 46.3% SiO2, 39.8% Al2O3, and 13.9% combined H2O. The structural formula of kaolinite is (OH)8Si4Al4O10. These deposits are sedimentary and contain approximately 90% or more kaolinite along with minor quantities of quartz, mica, and smectite along

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By |2018-05-01T14:36:33+00:00May 1st, 2018|Categories: Various|Comments Off on Kaolin Ceramics

How to Derate a Pump Curve for Slurry Pumping

The pump curves published by pump manufacturers are for the performance of the pump on water. Some pump manufacturers use a derating factor to correct the head and efficiency of the pump when pumping slurry.

This a subject which has had a lot of controversy and disagreement It is suggested that the method used be left to the manufacturer The method

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By |2018-05-01T12:24:53+00:00May 1st, 2018|Categories: Pumps and Pumping|Comments Off on How to Derate a Pump Curve for Slurry Pumping

Silver Chloride Chemistry

To appreciate the development of industrial silver chloride processing it is helpful to outline some of its general properties. Since more comprehensive reviews are available, only basic concepts will be covered here.

Silver chloride is a white, curdy, crystalline solid compound. In the lab, it is prepared from a solution of AgNO3 by precipitation

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By |2018-04-29T15:07:24+00:00April 29th, 2018|Categories: Various|Comments Off on Silver Chloride Chemistry

Effect of Air Flowrate on Flotation Column

On a flotation column cell, the variation of concentrate flowrate, clean coal yield and product grade with air flow rate are shown in Figure 4. These tests were carried out using a 5 wt. % feed slurry. The results show that the concentrate flow rate, yield and product ash content increased with air flow rate. This trend is expected since the available

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By |2018-04-29T12:08:15+00:00April 29th, 2018|Categories: Various|Comments Off on Effect of Air Flowrate on Flotation Column

Visman’ General Sampling Theory

A comprehensive analysis of the entire range of related studies would require a lengthy discussion. Instead, this paper will focus only on the work of Visman (1962, 1969), because his work is part of the current ASTM D2234 standard on coal sampling (American Society for Testing and Materials,

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By |2018-05-22T01:34:22+00:00April 28th, 2018|Categories: Various|Comments Off on Visman’ General Sampling Theory

How to Reduce Ball Mill Overload Risk

Two different circumstances must be addressed for the reduction or elimination of overload risk: a) in existing operations, or b) in the design of new grinding circuits. The methods necessary are in the first case an adjustment of operating conditions; and in the second an adjustment of mill shapes.

Existing Operations: from Equation

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By |2018-04-24T12:47:48+00:00April 24th, 2018|Categories: Grinding|Comments Off on How to Reduce Ball Mill Overload Risk

Column Flotation BIAS

Counter Current flow of mineralized bubbles & wash water

The column underflow is always of slightly higher volume than the feed. This volume imbalance, called BIAS in the control system, is made up by wash water inserted at the top of the column. Part of this wash water travels down the column to exit with the underflow. The remainder overflows with the loaded bubbles.

It is this unique application of wash

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By |2018-04-24T15:34:19+00:00April 23rd, 2018|Categories: Various|Comments Off on Column Flotation BIAS

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