Venturi Aerated Column

The Venturi aerated column (VAC) was designed based on the concept of reactor and separator design (Figure 2). In this case, the reactor is a Venturi tube where air/slurry contact takes place. The separator is a column of length 1-2 m. The partial recirculation of tailings slurry was used to intensify the slurry jetting action, facilitating bubble size control (typically 500-800 |im) and bubble/particle interaction.

Figure 3 presents a direct comparison between a laboratory Denver cell and a single VAC cell in batch tests for a nickel sulfide ore. The VAC cell gave a higher concentrate grade at the same nickel recovery. Two VAC cells in series (as a rougher-scavenger configuration) were tested in an operating plant treating nickel sulfide ores. Compared to the mill rougher flotation, superior metallurgy was obtained with the VAC cells. With two VAC cells in series, similar metallurgical performance to the plant multi-stage

Figure 2 Schematic of a Venturi aerated column (VAC).

Figure 3 A direct comparison in nickel grade/recovery performance between a batch Denver cell and a batch VAC cell. Squares, column; diamonds, column (repeat); triangles, Denver; circles, Denver (repeat).

Figure 4 Comparison in nickel metallurgy between a plant rougher flotation circuit and two VAC cells in series. Squares, two VAC cells, circles, mill overall daily; triangles, mill roughers.

Figure 5 Schematic of a cavitation tube on the feed line before a mechanical cell.

Figure 3 A direct comparison in nickel grade/recovery performance between a batch Denver cell and a batch VAC cell. Squares, column; diamonds, column (repeat); triangles, Denver; circles, Denver (repeat).

flotation circuit was achieved, as shown in Figure 4. The VAC cell has also been tested and found to be successful in de-inking applications of recycled paper pulp with the performance exceeding the existing plant circuit in terms of fibre recovery at comparable brightness.

Solar Panel Basics

Solar Panel Basics

Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.

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