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Method for atmospheric digestion of laterite ore

A technology of ore and laterite, applied in the field of hydrometallurgy, can solve the problem of increasing acid

Inactive Publication Date: 2008-09-24
BHP比利通创新有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] Another disadvantage of this method is that jarosite contains sulfate, which greatly increases the acid required for leaching
Sulfuric acid is a large input in the acid leaching process, so the jarosite method also has economic disadvantages

Method used

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  • Method for atmospheric digestion of laterite ore
  • Method for atmospheric digestion of laterite ore
  • Method for atmospheric digestion of laterite ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] A mixture of limonite and saprolite ores having a dry ratio of about 1 is formed into an aqueous slurry. The aqueous slurry is then mixed with 93% concentrated sulfuric acid to form a leach slurry. The acid was dosed in excess of 100% of the stoichiometric amount required to dissolve 90% of the nickel and cobalt in the mixed ore fraction. The first leaching process is carried out in a single reactor at a temperature of at least 80°C for at least 2 hours. During the first leaching process, iron compounds are precipitated out of solution.

[0044] The overflow from the leaching process is sent to a second reactor where the saprolite ore slurry is added to the mixture. A second leaching process is then performed, also at a temperature of at least 80°C for at least about 2 hours. During the second leaching process, iron compounds are further precipitated out of solution.

[0045] After the second leaching process is complete, the solid residue is separated from the leac...

Embodiment 3

[0053] A sample of magnesium sulfate heptahydrate (4.0093 g) was placed in a small basket and calcined in a thermogravimetric analyzer (TGA) under dry hydrogen flow (5 L / min). The temperature in TGA also increased from room temperature to 1000°C at a rate of 10°C / min. The sample showed a weight loss of about 2.03 g to 350°C, corresponding to the loss of water of crystallization. The weight then remained stable until 630°C, at which time a further weight loss was about 1.06 g. The rapid weight loss slows down at a temperature of 810°C. By 1000°C, the total weight loss had reached about 3.29 g. The remaining sample was carefully removed from the container and weighed. The weighed sample mass (0.63g) is very close to the formula MgO (theoretical weight 0.655g). A diagram of this process is shown in Figure 2.

Embodiment 4

[0055] Example 4 is a flow diagram shown in Figure 3 showing the process stages in an embodiment of the invention. In this example, separation of the leach residue from the enriched leach solution occurs prior to removal of residual iron and aluminum and recovery of Ni and Co metals. Ni and Co recovery is achieved using a technique selected from mixed hydroxide precipitation, mixed sulfide precipitation, solvent extraction or ion exchange.

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Abstract

An atmospheric leaching process in the recovery of nickel and cobalt from a lateritic ore, said lateritic ore including a low magnesium ore fraction and a high magnesium ore fraction, said process including the steps of: (a) forming an aqueous pulp of said lateritic ore, (b) leaching said aqueous pulp with a concentrated mineral acid at atmospheric pressure to produce a slurry containing a pregnant leach liquor and a leach residue, (c) treating the pregnant leach liquor either separately or as part of said slurry to recover dissolved nickel and cobalt therefrom, leaving a magnesium containing barren solution, (d) treating said magnesium containing solution to recover a magnesium containing salt therefrom.

Description

field of invention [0001] The present invention relates to a hydrometallurgical process for the recovery of nickel and cobalt from nickel-bearing laterite ores, and in particular to the atmospheric leaching of ores with low magnesium fractions (such as limonite) and high magnesium fractions (such as saprolite) with mineral acids to dissolve nickel and cobalt. In a preferred form of the method, the method further comprises the step of recovering the magnesium in the leach solution. Background of the invention [0002] Known reserves of nickel and cobalt in nickel-bearing oxide ores, those containing limonite and saprolite ores known as laterites, greatly exceed their corresponding reserves in sulphide ores. However, when dealing with laterite ores, an important disadvantage is that they cannot be beneficiated by conventional techniques. [0003] Many new hydrometallurgical methods are being developed to extract nickel and cobalt from nickel-bearing laterite ores. Many of t...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B3/08C22B26/22C22B23/00
CPCY02P10/20
Inventor 刘后元埃里克·格万·罗奇杰德夫·普拉萨德
Owner BHP比利通创新有限公司
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