Method for nickel and cobalt recovery from laterite ores by reaction with concentrated acid and water leaching

A technology of water leaching and laterite ore, which is applied in the direction of improving process efficiency, etc., can solve the problems of low nickel extraction rate, not providing nickel better than iron selective dissolution, and not high, so as to achieve the effect of reducing production

Inactive Publication Date: 2007-07-25
SKYE RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] Second, the extraction rate of nickel from the ore is significantly lower
However, this method also has major disadvantages
[0029] One of the disadvantages is that the ore used should contain no more than 1% moisture, which means that in most cases the ore must be dried, as the in situ moisture content of laterite ores is usually 20% or more
A second disadvantage, as shown by all the examples cited in the patent, is that the process does not provide selective dissolution of nickel over iron (>90% iron extraction)
These conditions are very similar to those of autoclave acid leaching, thus requiring the use of expensive autoclave systems as mentioned above

Method used

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  • Method for nickel and cobalt recovery from laterite ores by reaction with concentrated acid and water leaching
  • Method for nickel and cobalt recovery from laterite ores by reaction with concentrated acid and water leaching
  • Method for nickel and cobalt recovery from laterite ores by reaction with concentrated acid and water leaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075]About 1 kg of saprolite ore was wet ground in a ball mill to about 100% passing through a 100 mesh screen. The ground slurry was filtered to produce a ground saprolite with a moisture content of 41%. 425.2 g of wet ground saprolite was mixed with 381.7 g of wet limonite ore to make 500 g of leach material with a limonite / saprolite ratio (on a dry solid basis) of 1:1.

[0076] Put the ore mixture into a 4.5-liter narrow-necked glass bottle. The bottles were rolled on a bottle rolling device at a slight angle to the horizontal at a speed of approximately 47 to 48 rpm. 312.5 g of 96% sulfuric acid was added to the ore mixture in the bottle over about 30 minutes. After all the acid has been added, the ore is mixed with the acid for about 30 minutes. At the end of mixing the ore and acid form a semi-fluid mass and the temperature rises to between about 70 and 100°C.

[0077] The bottle is removed from the rolling equipment and the mixture of acid and ore is allowed to age...

Embodiment 2

[0088] A 381.7 g sample of limonite ore was mixed with 317.7 g of crushed saprolite ore and 95 g of water in a 2 liter flat bottom glass beaker. Water was added to simulate the expected moisture content of the crude ore, it being recognized that the sample was slightly drier than it was in situ. 312.5 g of 96% sulfuric acid was added to the beaker over about 30 minutes. The acid was mixed with the ore using a stirrer at 60 rpm. The amount of acid added is sufficient so that the acid to ore ratio is about 600 kg H 2 SO 4 / ton of ore (calculated as dry product).

[0089] The semi-fluid mass of ore and acid was poured into shallow pans to age at room temperature for about 72 hours. A portion of the mixture was not recovered during this process, an estimated 13% of the mixture was not recovered on a gravimetric basis.

[0090] After the aging process, the acid / ore mixture, which has hardened significantly, is broken into chunks and transferred to small grinders. 300 g of wa...

Embodiment 3

[0100] This test was performed in a manner similar to Example 2 with the following differences. Limonite ore, crushed saprolite ore, water, acid and hematite seeds were used in amounts of 336.9 g, 280.3 g, 84 g, 275.8 g and 113 g during acid mixing and subsequent leaching, respectively. The proportions of ore, water and acid are the same as in Example 2.

[0101] After the ore is mixed with the acid, the mixture is transferred to shallow pans and matured for just 1 hour before being transferred to a grinder for wet grinding followed by water leaching. After 1 hour of aging, the mixture was still fluid and could be poured into a grinder. 1,776 g of leach slurry was prepared and leached in exactly the same way as in Example 2. The recovery of the acid / ore mixture was close to 96%.

[0102] The results of this test are given in Tables 6 and 7 below.

[0103] Table 6

[0104] time (h)

[Ni]g / L

[Fe]g / L

[H 2 SO 4 ]g / L

1

5.53...

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Abstract

A process for leaching laterite ores containing limonite and saprolite in a two stage process. The first stage consisting of mixing and reacting the ore with concentrated mineral acid, and the second stage consisting of preparing a slurry of the acid / ore mixture in water and leaching the mixture to dissolve nickel and cobalt. Iron is efficiently separated from nickel and cobalt in the solid leach residue primarily as an oxide or hydroxide of ferric iron other than jarosite.

Description

[0001] Cross-references to related applications [0002] This application claims priority to US Provisional Patent Application No. 60 / 583,243, filed June 28, 2004, the disclosure of which is hereby incorporated by reference into this specification. technical field [0003] This invention relates to the hydrometallurgical treatment of nickel-bearing laterite ores, and in particular to the acid leaching of the limonite and saprolite constituents of such ores in the same process. Background technique [0004] Laterite ore is formed by in situ weathering of nickel-containing ultrabasic (ultramafic) rocks adjacent to or on the earth's surface through natural acidic precipitation in a tropical environment. It contains a variety of clay, oxide and silicate minerals, some rich in nickel and / or cobalt, which distinguishes it from another large class of nickel ores, sulfide ores. The latter generally contain sulfide minerals of iron, nickel and cobalt, often with copper and small amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/06C22B3/44
CPCC22B23/043C22B23/0461Y02P10/20C22B23/00
Inventor D·纽道弗
Owner SKYE RESOURCES
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