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Iron precipitation

A technology of ferric iron and iron oxide, which is applied in the field of iron precipitation and can solve problems such as the loss of valuable metals

Inactive Publication Date: 2011-05-18
BHP BILLITON SSM TECH PTY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the potential loss of valuable metals attached to the ferric hydroxide or precipitated with the iron when the ferric hydroxide is precipitated is an economic disadvantage in the current method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0056] Example 1 - Comparative Example

[0057] A solution (2.5 L) containing nickel sulfate and iron sulfate was placed in a baffled reaction vessel equipped with a mechanical stirrer. Stirring the heating vessel raised the solution temperature to 85°C, which was the control temperature throughout the experiment. A slurry of limestone in water (25% w / w) was pumped into the reactor to achieve and maintain a pH of 3.0. If necessary, add a small amount of concentrated H 2 SO 4 to correct the pH to this level. After stirring for 25 minutes, the contents of the container were decanted and a sedimentation test and a vacuum filtration test were performed on two 1 L samples of the slurry. At the completion of these tests, the combined slurry was filtered and the filter cake was washed thoroughly with water. A sample of the solid was dried and assayed by XRF.

Embodiment 2

[0058] Example 2 - Controlled goethite precipitation at constant pH

[0059] Water (500 mL) was placed in the same baffled reaction vessel as described in Example 1. The vessel was heated with stirring to raise and maintain the vessel contents at 85°C throughout the experiment. A sample of the solution (2.5 L) as used in Example 1 was pumped into the reactor for 2.5 hours at a controlled rate to maintain a ferric ion concentration of 1.1 g / L to 2.5 g / L . The solution pumping rate was increased from 9 mL / min at the beginning of the experiment to 46 mL / min at the end of the experiment to maintain the ferric ion concentration within this range. A slurry of limestone in water (25% w / w) was simultaneously pumped into the reactor to achieve and maintain a pH of 2.0. When 2.5 hours was complete, the contents of the reaction vessel were decanted and processed as in Example 1.

Embodiment 3

[0060] Example 3 - Controlled goethite precipitation at constant pH and ambient temperature

[0061] Water (500 mL) was placed in the same baffled reaction vessel as described in Example 1. A sample (2.5 L) of the solution as used in Example 1 was pumped into the reactor for 2.5 hours at a controlled rate to maintain a ferric ion concentration of 0.22 g / L to 0.31 g / L. The solution pumping rate was increased from 9 mL / min at the beginning of the experiment to 46 mL / min at the end of the experiment to maintain the ferric ion concentration within this range. A slurry of limestone in water (25% w / w) was pumped simultaneously into the reactor to achieve and maintain a pH of 3.0. Throughout the experiment, the temperature was allowed to remain at ambient temperature of 21 °C. When 2.5 hours was complete, the contents of the reaction vessel were decanted and processed as in Example 1.

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PUM

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Abstract

A process for the treatment of a solution containing at least ferric ions, and one or more metal values, includes the step of maintaining a controlled concentration of ferric ions in solution for a sufficient residence time to control iron hydroxide or oxide crystal growth, and precipitating the iron as a relatively crystalline iron hydroxide or oxide while minimising the loss of the ore or more metal values with the iron hydroxide or oxide.

Description

[0001] foreword [0002] The present invention relates to a method of treating a solution comprising at least ferric ions and one or more valuable metals. In the process, the concentration of ferric ions in solution is controlled in a tank or vat for sufficient residence time to control ferric hydroxide or ferric oxide crystal growth. In one form, crystal growth is enhanced by the presence of iron hydroxide or iron oxide seeds that cause iron to precipitate as relatively crystalline hydrogen containing less than 0.05% of valuable metals Iron oxide or iron oxide. The method can be performed at ambient temperature or at elevated temperature. In a preferred form, the iron precipitate is goethite. The method is particularly suitable for recovering nickel and / or cobalt from laterite acid leaching. Background of the invention [0003] Iron and aluminum usually need to be removed before many valuable metals can be recovered from solution. In nickel and cobalt recovery processes,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/00C22B15/00C22B23/00B01D9/02C22B19/00
CPCB01D9/004C22B3/44C22B23/0461Y02P10/20
Inventor 埃里克·格万·罗奇
Owner BHP BILLITON SSM TECH PTY LTD
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