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Wet-mode nickel oxide ore smelting method

A smelting method and ore technology, which is applied in the field of wet smelting of nickel oxide ore, can solve the problems of inability to recycle resources and high cost burden

Active Publication Date: 2015-06-17
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the final neutralization residue contains not only impurities such as hematite and chromite in the leaching residue, but also gypsum formed by the neutralization treatment, it cannot be used as a resource for tailings dams. The large cost burden of construction and maintenance management

Method used

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  • Wet-mode nickel oxide ore smelting method
  • Wet-mode nickel oxide ore smelting method
  • Wet-mode nickel oxide ore smelting method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0205] Classification of the ore slurry having the composition shown in Table 3 was performed using a hydrocyclone (manufactured by Ataka Taiki Co., Ltd., MD-9 type) as a classifier used in the step (A).

[0206] In Example 1, classification was performed under the conditions that the slurry concentration was 15% by mass, the temperature of the slurry was normal temperature, and the operating pressure was 0.2 MPa.

[0207] Table 3 describes the ore slurry composition and the underflow composition of the hydrocyclone. In addition, the unit of the following table|surface is mass %.

[0208] [table 3]

[0209]

Cr 2 o 3

SiO 2

Fe

Ni

ore slurry

2.9

4.1

50.8

1.2

HC-UF

8.1

5.5

45.8

1.0

[0210] IIC-UF: Underflow from hydrocyclones

[0211] As can be seen from Table 3, in the coarse particle part (underflow) obtained by the hydrocyclone, Cr 2 o 3 Relative to 2.9 mass% in the ore, rising to 8.1 ma...

Embodiment 2

[0239] Classification of the ore slurry shown in Table 7 was performed using a hydrocyclone (manufactured by Ataka Daiki Co., Ltd., MD-9 type) as a classifier. Here, the slurry concentration was set to 15% by mass, the temperature of the slurry was set to normal temperature, and the operating pressure was set to 0.2 MPa.

[0240] The ore and hydrocyclone underflow compositions are reported in Table 7.

[0241] [Table 7]

[0242]

Cr 2 o 3

SiO 2

Fe

Ni

ore slurry

3.4

4.4

51.5

1.1

HC-UF

9.2

6.0

45.2

1.0

HC-OF

1.8

4.5

53.7

1.2

[0243] HC-UF: Underflow from hydrocyclones

[0244] HC-OF: The overflow of the hydrocyclone

[0245] As can be seen from Table 7, in the coarse grain fraction (HC-UF) obtained by the hydrocyclone, Cr 2 o 3 Relative to 3.4 mass% in the ore, rising to 9.2 mass%, SiO 2 It rose to 6.0% by mass relative to 4.4% by mass in the feed ore, but on the ot...

Embodiment 3

[0295] The overflow of the hydrocyclone separator of embodiment 2 and the overflow of the Flotex density separator are packed into the autoclave with the ratio of solid weight 77:15, and 98% sulfuric acid is added therein, under the following conditions, High-temperature and pressurized sulfuric acid leaching is carried out to prepare the leaching slurry 10 .

[0296] Furthermore, the prepared leaching slurry is separated into a leaching liquid 11 and a leaching residue slurry 12 through a solid-liquid separation step.

[0297] [Leaching condition]

[0298] Leaching temperature: 245°C

[0299] Leaching time: 60 minutes

[0300] Final (at the end of leaching) free sulfuric acid concentration: 40[g / L]

[0301] Slurry concentration: 30% by weight

[0302] Autoclave capacity: 5L

[0303] Next, in order to know the Cr in the leaching residue slurry 12 2 o 3 Grade, add the neutralizing agent Mg(OH) of concentration 20 mass % in leaching residue slurry 12 2 The slurry was neu...

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Abstract

Provided is a wet-mode smelting method for collecting nickel (Ni) from a Ni oxide ore employing a high-pressure acid leaching process, in which the abrasion of a facility by an ore slurry can be prevented, the amount of a final neutralization residue can be reduced, and impurity components can be separated and recovered for recycling purposes. A wet-mode smelting method for collecting nickel from a nickel oxide ore, said method involving at least one step selected from steps (A), (B-1) and (B-2) as mentioned below in a high-pressure acid leaching process: step (A): separating and collecting chromite particles from an ore slurry produced in an ore treatment step by a collection process involving a gravity separation method; step (B-1): subjecting the ore slurry, which has been undergone step (A) to reduce the Cr grade thereof, to a leaching step and a solid / liquid separation step, and then neutralizing a leached solution obtained after the solid / liquid separation step with an Mg-containing alkali such as Mg(OH)2; and step (B-2): subjecting the ore slurry, which has been undergone step (A) to reduce the Cr grade thereof, to a leaching step and a solid / liquid separation step, then neutralizing a leaching residue slurry obtained after the solid / liquid separation step with an Mg-containing alkali such as Mg(OH)2, and then collecting hematite particles.

Description

technical field [0001] The invention relates to a wet smelting method of nickel oxide ore. [0002] Specifically, it relates to a wet smelting method of nickel oxide ore capable of separating and recovering impurity components, which includes an ore treatment process, a leaching process, a solid-liquid separation process, a neutralization process, a zinc removal process, a sulfidation process, and a final neutralization process. The high-pressure acid leaching method in the process can recover nickel and cobalt from nickel oxide ore, which can achieve the following problem, and can be used effectively as a resource. The problem is to suppress the piping caused by the ore slurry produced in the ore processing process. , pumps and other equipment wear, improve durability, reduce the amount of final neutralization residue produced by the final neutralization process, and suppress it by compressing the capacity of the tailings dam that stores waste leaching residue, neutralization...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B3/04C22B3/44
CPCC22B23/0415C22B23/0461C22B23/005C22B23/043Y02P10/20C22B3/08C22B3/22C22B3/44
Inventor 服部靖匡菅康雅渡边秀敏
Owner SUMITOMO METAL MINING CO LTD
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