Wet smelting method of nickel oxide ore

Abstract

In the wet smelting method of nickel oxide ore performed by high temperature compression acid, because most of the iron ore is fixed into an immersion residue in the form of red iron ore, it can achieve the oxidation rate of high -speed rail and suppress the amount of sulfuric acid during immersion.Make nickel and cobalt immersion at a high immersion rate.Measure the carbon grade and flow in the ore pulp prepared in the 1st process, and find the carbon capacity of the second process in the second process. Then, in the second process of adding high -pressure air and high -pressure water vapor to implement it.Adjust the proportion of high -pressure air and high -pressure oxygen to make its oxygen purity reach 21 to 60 %, and while maintaining the purity of the oxygen, the oxygen blowing amount is relative toThe weight of each 1T carbon of the process is 200 to 600nm3, and the ORP (based on AG / AGCL as the benchmark) in the immersion process is 400-650mv.

Description

technical field

[0001] The invention relates to a wet smelting method of nickel oxide ore recovered by leaching nickel and cobalt from the nickel oxide ore with acid under high temperature and pressure. This application claims priority based on Japanese Patent Application No. 2013-056012 filed in Japan on March 19, 2013, and Japanese Patent Application No. 2013-195610 filed in Japan on September 20, 2013. This application is incorporated herein by reference. Background technique

[0002] Conventionally, as a smelting process for separating and recovering nickel and cobalt from iron from a nickel oxide ore containing iron as a main component and containing 1 to 2% by weight of nickel, for example, dry smelting or reduction Roasting-leaching method, the dry smelting method is: roasting nickel oxide ore, reducing and sulfiding the nickel component, and then smelting to produce matte containing nickel sulfide; the reduction roasting-leaching method is: After the nickel oxide o...

Examples

Embodiment 1

[0095] Example 1 is operated in the following manner: the carbon (C) grade in the solid content is 0.22% by weight, and for high-pressure air and high-pressure oxygen of about 5MPaG, the oxygen purity is adjusted to 46.6%, so as to correspond to 1 ton of carbon The amount is 426 [Nm 3 -O 2 / t-C] the oxygen blowing amount is blown in, and the oxygen partial pressure in the container is adjusted to 277kPaG. In addition, it operated while blowing high-pressure steam of about 5 MPaG, and maintaining the temperature of 245 degreeC, stirring.

[0096] As a result, the ORP (based on Ag / AgCl) of the obtained leaching slurry was properly maintained at 559mV, and the amount of sulfuric acid per 1 ton of dry ore was 226 [kg-H 2 SO 4 / t-dry-solids].

Embodiment 2

[0098] In Example 2, the operation was carried out in the following manner: the carbon (C) grade in the solid content was 0.23% by weight, and the oxygen purity was adjusted to 47.8% for high-pressure air and high-pressure oxygen of about 5MPaG, so as to correspond to each 1 ton of carbon is 317[Nm 3 -O 2 / t-C] the oxygen blowing amount is blown in, and the oxygen partial pressure in the container is adjusted to 277kPaG. In addition, it operated while blowing high-pressure steam of about 5 MPaG, and maintaining the temperature of 245 degreeC, stirring.

[0099] As a result, the ORP (based on Ag / AgCl) of the obtained leaching slurry was properly maintained at 518mV, and the amount of sulfuric acid per 1 ton of dry ore was 219 [kg-H 2 SO 4 / t-dry-solids].

Embodiment 3

[0101] In Example 3, the operation was carried out in the following manner: the carbon (C) grade in the solid content was 0.24% by weight, and the oxygen purity was adjusted to 54.7% for high-pressure air and high-pressure oxygen of about 5MPaG, so as to correspond to each 1 ton of carbon is 412[Nm 3 -O 2 / t-C] the oxygen blowing amount is blown in, and the oxygen partial pressure in the container is adjusted to 325kPaG. In addition, it operated while blowing high-pressure steam of about 5 MPaG, and maintaining the temperature of 245 degreeC, stirring.

[0102] As a result, the ORP (based on the Ag / AgCl electrode) of the obtained leaching slurry was properly maintained at 528mV, and the amount of sulfuric acid per 1 ton of dry ore was 232 [kg-H 2 SO 4 / t-dry-solids].

technical field

[0001] The invention relates to a wet smelting method of nickel oxide ore recovered by leaching nickel and cobalt from the nickel oxide ore with acid under high temperature and pressure. This application claims priority based on Japanese Patent Application No. 2013-056012 filed in Japan on March 19, 2013, and Japanese Patent Application No. 2013-195610 filed in Japan on September 20, 2013. This application is incorporated herein by reference. Background technique

[0002] Conventionally, as a smelting process for separating and recovering nickel and cobalt from iron from a nickel oxide ore containing iron as a main component and containing 1 to 2% by weight of nickel, for example, dry smelting or reduction Roasting-leaching method, the dry smelting method is: roasting nickel oxide ore, reducing and sulfiding the nickel component, and then smelting to produce matte containing nickel sulfide; the reduction roasting-leaching method is: After the nickel oxide o...

Examples

Embodiment 1

[0095] Example 1 is operated in the following manner: the carbon (C) grade in the solid content is 0.22% by weight, and for high-pressure air and high-pressure oxygen of about 5MPaG, the oxygen purity is adjusted to 46.6%, so as to correspond to 1 ton of carbon The amount is 426 [Nm 3 -O 2 / t-C] the oxygen blowing amount is blown in, and the oxygen partial pressure in the container is adjusted to 277kPaG. In addition, it operated while blowing high-pressure steam of about 5 MPaG, and maintaining the temperature of 245 degreeC, stirring.

[0096] As a result, the ORP (based on Ag / AgCl) of the obtained leaching slurry was properly maintained at 559mV, and the amount of sulfuric acid per 1 ton of dry ore was 226 [kg-H 2 SO 4 / t-dry-solids].

Embodiment 2

[0098] In Example 2, the operation was carried out in the following manner: the carbon (C) grade in the solid content was 0.23% by weight, and the oxygen purity was adjusted to 47.8% for high-pressure air and high-pressure oxygen of about 5MPaG, so as to correspond to each 1 ton of carbon is 317[Nm 3 -O 2 / t-C] the oxygen blowing amount is blown in, and the oxygen partial pressure in the container is adjusted to 277kPaG. In addition, it operated while blowing high-pressure steam of about 5 MPaG, and maintaining the temperature of 245 degreeC, stirring.

[0099] As a result, the ORP (based on Ag / AgCl) of the obtained leaching slurry was properly maintained at 518mV, and the amount of sulfuric acid per 1 ton of dry ore was 219 [kg-H 2 SO 4 / t-dry-solids].

Embodiment 3

[0101] In Example 3, the operation was carried out in the following manner: the carbon (C) grade in the solid content was 0.24% by weight, and the oxygen purity was adjusted to 54.7% for high-pressure air and high-pressure oxygen of about 5MPaG, so as to correspond to each 1 ton of carbon is 412[Nm 3 -O 2 / t-C] the oxygen blowing amount is blown in, and the oxygen partial pressure in the container is adjusted to 325kPaG. In addition, it operated while blowing high-pressure steam of about 5 MPaG, and maintaining the temperature of 245 degreeC, stirring.

[0102] As a result, the ORP (based on the Ag / AgCl electrode) of the obtained leaching slurry was properly maintained at 528mV, and the amount of sulfuric acid per 1 ton of dry ore was 232 [kg-H 2 SO 4 / t-dry-solids].

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