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Method for producing ferronickel through nickel-laterite ore direct reduction and ore-dressing enrichment method

A laterite nickel ore and direct technology, applied in the field of direct reduction of laterite nickel ore - beneficiation and enrichment to produce ferronickel, can solve the problems of inability to process laterite nickel ore, fluctuating recovery rate of beneficiation, low recovery rate, etc.

Active Publication Date: 2017-10-20
SHENYANG RES INST OF NONFERROUS METALS
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Problems solved by technology

The process of rotary kiln direct reduction-separation enrichment method for processing laterite nickel ore has the characteristics of low energy consumption and low cost, but there are always some problems, which have led to the fact that the technology has not been effectively promoted so far. The specific problems are as follows
[0005] (1) The problem of raw material adaptability: the composition and structure of laterite nickel ore are complex, and the setting of technical parameters of this process is only suitable for processing a certain origin, a certain type or similar laterite nickel ore, and cannot be applied to the treatment of all laterite nickel ore
[0006] (2) Rotary kiln ringing problem: Laterite nickel ore is directly reduced and roasted without granulation, and a semi-molten transition state appears in the temperature range of 950-1300°C. The ringing of the rotary kiln seriously affects the operating rate, and even cannot continue to produce, resulting in production failure. Capability cannot be guaranteed
[0007] (3) The problem of granulation cost: Through practical research, people adopt the method of laterite nickel ore granulation to effectively alleviate the ring formation or prolong the ring formation period of the rotary kiln, but it cannot be completely avoided; and the laterite nickel ore granulation needs to be crushed , Drying, dry grinding, mixing and pressing (making) balls and other cumbersome processes, the processing cost is relatively high
[0008] (4) The problem of low nickel recovery rate: due to the production fluctuation caused by the ringing of the rotary kiln, or the continuous adjustment of the smelting state to control the ringing, the reduction effect is extremely unstable, which directly leads to large fluctuations in the recovery rate of the beneficiation, thus making the entire process The recovery rate is at a low level, generally between 60-80%
Especially after Indonesia and other countries implemented the policy of restricting the export of raw ore, they encouraged foreign investment to develop their own laterite nickel ore resources, but their domestic infrastructure was extremely lacking, which created a new realistic demand for low-cost direct reduction-ore dressing and enrichment technology

Method used

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  • Method for producing ferronickel through nickel-laterite ore direct reduction and ore-dressing enrichment method
  • Method for producing ferronickel through nickel-laterite ore direct reduction and ore-dressing enrichment method

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Effect test

Embodiment 1

[0028] Laterite nickel ore comes from Indonesia, the main components are: Ni 1.84%, Fe21.52%, MgO13.63%, SiO 2 30.71.

[0029]During the test, the laterite nickel ore was mixed with self-made low-grade nickel-iron composite additives, and two kiln roasting reduction-magnetic separation + strong magnetic magnetic separation technical schemes were used, and good technical indicators were obtained. The main technical conditions of the test: under the condition of 750 ℃, first dry the laterite nickel ore until the surface water content is 20%, and the particle size of the laterite nickel ore is less than 12mm; and iron ore concentrate 3.5%, conventionally mixed and prepared) the addition amount is 15% of the dry base ore, the reducing agent is bituminous coal, and the addition amount is 18% of the dry base ore; the length-to-diameter ratio of the first stage of the rotary kiln 1 is 15: 1. The drying and roasting temperature is 880-920°C and the time is 2 hours to obtain hot calc...

Embodiment 2

[0032] The laterite nickel ore comes from the Tagaung Mountain Nickel Mine in Myanmar, and its main components are: Ni 2.16%, Fe13.98%, MgO 20.32%, SiO2 41.37%. During the test, the laterite nickel ore was mixed with self-made low-grade nickel-iron composite additives, and two kiln roasting reduction-magnetic separation + strong magnetic magnetic separation technical schemes were used, and good technical indicators were obtained. The main technical conditions of the test: under the condition of 700 ℃, first dry the laterite nickel ore until the surface water content is 20%, and the particle size of the laterite nickel ore is less than 12mm; and iron concentrate 3%), the addition amount is 16% of the dry base ore, the reducing agent is bituminous coal, and the addition amount is 16% of the dry base ore; 870-900°C for 2 hours to obtain hot calcined sand. The hot calcined sand in the first section of the rotary kiln 1 is directly fed into the second section of the rotary kiln 2 t...

Embodiment 3

[0035] Laterite nickel ore comes from Philippine nickel ore, the main components are: Ni 1.65%, Fe19.37%, MgO16.11%, SiO 2 38.25%. During the test, the laterite nickel ore was mixed with self-made low-grade nickel-iron composite additives, and two kiln roasting reduction-magnetic separation + strong magnetic magnetic separation technical schemes were used, and good technical indicators were obtained. The main technical conditions of the test: at 730°C, first dry the laterite nickel ore until the surface water content is 18%, and the particle size of the laterite nickel ore is less than 12mm; and iron concentrate 4%), the addition amount is 16% of the dry base ore, the reducing agent is bituminous coal, and the addition amount is 15% of the dry base ore; 860-900°C for 2 hours to obtain hot calcined sand. The hot calcined sand in the first section of the rotary kiln 1 is directly fed into the second section of the rotary kiln 2 through the feeding pipe 4. The feeding pipe 4 is ...

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Abstract

The invention belongs to the technical field of nonferrous metallurgy and particularly relates to a method for producing ferronickel through a nickel-laterite ore direct reduction and ore-dressing enrichment method. According to the method, two rotary kilns are adopted for reduction roasting to avoid the rotary kiln ring formation temperature intervals. By means of the method, the serious technical problems existing in an existing direct reduction and ore-dressing enrichment method are solved; continuous production and smooth running can be guaranteed; good economic benefits can be obtained. The technology can be applied and popularized in production and especially has more practical significance in development of nickel-laterite ore resources in areas lacking electric power facilities.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metallurgy, and in particular relates to a method for producing ferronickel by direct reduction of laterite nickel ore and beneficiation and enrichment. Background technique [0002] There are two types of nickel resources that can be mined and utilized in nature, namely nickel sulfide ore and laterite nickel ore. The ratio of nickel sulfide ore and laterite nickel ore in the total nickel resources is about 3:7, and the mining history of sulfide ore is long, and the resource It has been increasingly unable to meet the needs of industry. Therefore, laterite nickel ore is the main source of raw materials for the nickel metallurgical industry in the future. [0003] The processing technology of laterite nickel ore can be divided into hydrometallurgy and pyrometallurgy. In recent years, with the construction and operation of several laterite nickel ore pressure acid leaching plants in Australia a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C22B5/10C22B1/02C21B13/08B02C23/08
CPCB02C23/08C21B13/008C21B13/08C22B1/02C22B5/10C22B23/005C22B23/021C22B23/023
Inventor 尹文新赵景富孙镇张向军
Owner SHENYANG RES INST OF NONFERROUS METALS
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