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Method for sintering and blending nickel laterite ore

A laterite nickel ore and ore blending technology, which is applied in the field of metallurgy, can solve the problems of high power consumption in submerged arc furnace smelting, high process energy consumption, and inability to recover cobalt, etc.

Active Publication Date: 2014-11-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large power consumption of submerged arc furnace smelting, the process energy consumption is high, and cobalt in nickel ore cannot be recovered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using a variety of laterite nickel ores as sintering raw materials, after ore blending, MgO / SiO in the mixture 2 =0.5, MgO / Al 2 O 3 =3.2, Al 2 O 3 / SiO 2 = 0.2, then add lime to adjust the quaternary alkalinity of the mixture to 1.3, add 12% coke powder outside, and 25% return ore inside, mix and granulate into a sintering mixture of 0.5-8mm, and the water content of the mixture is 34 %. The mixture is distributed, sintered and roasted, wherein the thickness of the sintered material layer is controlled to be 500mm, the sintering ignition time is 2min, the heat preservation is 1min, the ignition temperature is 1100±20°C, the ignition negative pressure is 5kPa, the sintering temperature is 1320±30°C, and the sintering exhaust negative pressure is 10kPa , after the sintering is completed, the cooling negative pressure is adjusted to 5kPa, and the cooling time is 3min. The yield of the obtained sintered ore is 73.43%, the drum strength is 72.57%, and the utilization c...

Embodiment 2

[0035] Using a variety of laterite nickel ores as sintering raw materials, after ore blending, MgO / SiO in the mixture 2 =0.5, MgO / Al 2 O 3 =3.2, Al 2 O 3 / SiO 2 = 0.2, then add lime to adjust the quaternary alkalinity of the mixture to 1.0, and the external coke powder ratio is 12%, and the internal ore is 25%. Moisture is 34%. The mixture is distributed, sintered and calcined, wherein the thickness of the sintered material layer is controlled to be 500mm, the sintering ignition time is 2min, the heat preservation time is 1min, the ignition temperature is 1100±20°C, the ignition negative pressure is 5kPa, the sintering temperature is 1320±30°C, and the sintering and sintering exhaust negative pressure is 10kPa, the sintering exhaust gas temperature reached the highest point as the sintering end point, after reaching the end point, the cooling negative pressure was adjusted to 5kPa, and the cooling time was 3min. The yield of the obtained sintered ore is 80.46%, the drum ...

Embodiment 3

[0037] Using a variety of laterite nickel ores as sintering raw materials, after ore blending, MgO / SiO in the mixture 2 =0.6, MgO / Al 2 O 3 =2.1, Al 2 O 3 / SiO 2 = 0.3, then add lime to adjust the quaternary alkalinity of the mixture to 0.5, and the external coke powder ratio is 12%, and the internal ore is 25%. Moisture is 34%. The mixture is distributed, sintered and calcined, wherein the thickness of the sintered material layer is controlled to be 500mm, the sintering ignition time is 2min, the heat preservation is 1min, the ignition temperature is 1100±20°C, the ignition negative pressure is 5kPa, the sintering temperature is 1300±30°C, and the sintering and sintering exhaust negative pressure is 10kPa, after sintering, adjust the cooling negative pressure to 5kPa, and the cooling time is 3min. The yield of the obtained sintered ore is 76.54%, the drum strength is 65.72%, and the utilization coefficient is 0.962t / (h·m 2 ).

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Abstract

The invention discloses a method for sintering and blending nickel laterite ores. The method comprises the following steps: blending multiple nickel laterite ores of the same components but different mass proportions, wherein the mass ratios of the components are as follows: the ratio of MgO to Al2O3 is 0.2 to 0.6, the ratio of MgO to Al2O3 is 2 to 5, and the ratio of Al2O3 to SiO2 is 0.1 to 0.5; adding an alkali flux and solid fuel to regulate the chemical components, so as to adjust the quaternary alkalinity, the sintering temperature and the sintering atmosphere of a sintered mixed material. The quaternary alkalinity, the sintering temperature and the sintering atmosphere are matched with one another, an appropriate pasting phase is generated in the sintering process of the nickel laterite ores, and the liquid phase generation in the sintering process is improved, so that the ore sintering quality and the metallurgical performance are improved, the sintering energy consumption is reduced, the quality of a blast furnace material is improved, the cost for producing ferronickel by using a smelting method is greatly lowered, and high-quality raw materials are provided for later ferronickel production through smelting in a submerged arc furnace.

Description

technical field [0001] The invention discloses a method for sintering and blending of laterite nickel ore, in particular to a method for ore blending of laterite nickel ore to produce sintered ore for steelmaking. It belongs to the field of metallurgical technology. Background technique [0002] Nickel is mainly used in stainless steel, superalloy, electroplating and chemical industries, among which the consumption of nickel in stainless steel accounts for about 66% of the total global nickel consumption. By 2012, the output of crude stainless steel in my country reached 16.087 million tons, and the apparent consumption of stainless steel was 12.865 million tons, ranking first in the world. The rapid development of the stainless steel industry is also driving strong demand for nickel. [0003] Although laterite nickel ore accounts for more than 70% of the world's total land-based nickel resources, it has not been fully developed and utilized due to technical and economic r...

Claims

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Application Information

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IPC IPC(8): C22B1/16
Inventor 李光辉姜涛饶明军罗骏张元波范晓慧朱忠平彭志伟陈许玲郭宇峰黄柱成杨永斌李骞徐斌梁斌珺智谦游志雄刘君豪贾浩
Owner CENT SOUTH UNIV
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