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Method for enriching nickel concentrate from low-grade laterite nickel ore

A kind of laterite nickel ore, low-grade technology, applied in the fields of chemical mineral processing and metallurgical chemical science, can solve the problem of insignificant selective reduction effect, and achieve the effects of high reduction performance and cleanliness, low power consumption, and low equipment wear rate

Inactive Publication Date: 2017-10-10
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Usually the laterite nickel ore and the reducing agent undergo a reduction reaction directly, and the selective reduction effect is not obvious. Adding additives to the laterite nickel ore to modify the selective reduction is the most effective method

Method used

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  • Method for enriching nickel concentrate from low-grade laterite nickel ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Low-grade lateritic nickel ore (TNi: ~1.34 wt.%) is crushed to 4-6mm with a jaw crusher, and then dried in an oven at 80°C. The dried laterite nickel ore is ground with a rod mill to a fineness of -0.15 mm, accounting for more than 90%, and placed in a muffle furnace for pre-roasting. Then independently add sodium thiosulfate (Na 2 S 2 o 3 ), or potassium thiosulfate (K 2 S 2 o 3 ), or calcium thiosulfate (CaS 2 o 3 ), or barium thiosulfate (BaS 2 o 3 ) additives, mixed evenly and kneaded with appropriate amount of water, placed in extruder and extruded to obtain columnar particles with a diameter of 3 to 5 mm and a length of 5 to 10 mm, and the columnar particles were dried in a drying oven to obtain dried and shaped laterite nickel ore . Put the dried laterite nickel ore into the fixed bed reaction device under the inert gas N 2 Heating in the atmosphere to 1200°C, and then passing a mixed gas containing 80% CO reducing gas by volume fraction, the space vel...

Embodiment 2

[0027]Low-grade laterite nickel ore (TNi: ~1.34 wt.%) is crushed to 4-6mm with a jaw crusher, then dried in an oven at 80°C, and the dried laterite nickel ore is ground to fineness with a rod mill -0.15mm accounts for more than 90%, put it in the muffle furnace for pre-roasting, add 5%, 10%, 15%, 20% and 25% of the weight of laterite nickel ore to the pre-roasted laterite nickel ore respectively Sodium sulfate (Na 2 S 2 o 3 ) additives, mixed evenly and kneaded with appropriate amount of water, placed in extruder and extruded to obtain columnar particles with a diameter of 3 to 5 mm and a length of 5 to 10 mm, and the columnar particles were dried in a drying oven to obtain dried and shaped laterite nickel ore . Put the dried laterite nickel ore into the fixed bed reaction device under the inert gas N 2 Heating in the atmosphere to 1200°C, and then passing a mixed gas containing 80% CO reducing gas by volume fraction, the space velocity of the mixed gas is 1000h -1 , the ...

Embodiment 3

[0029] Low-grade laterite nickel ore (TNi: ~1.34 wt.%) is crushed to 4-6mm with a jaw crusher, then dried in an oven at 80°C, and the dried laterite nickel ore is ground to fineness with a rod mill -0.15mm accounts for more than 90%, put it in the muffle furnace for pre-roasting, add 20% sodium thiosulfate (Na 2 S 2 o 3 ) additives, mixed evenly and kneaded with appropriate amount of water, placed in extruder and extruded to obtain columnar particles with a diameter of 3 to 5 mm and a length of 5 to 10 mm, and the columnar particles were dried in a drying oven to obtain dried and shaped laterite nickel ore . Put the dried laterite nickel ore into the fixed bed reaction device under the inert gas N 2 The atmosphere is heated to a given temperature of 800°C, 900°C, 1000°C, 1100°C, and 1200°C respectively, and then a mixed gas containing a volume fraction of 80% CO reducing gas is introduced, and the space velocity of the mixed gas is 1000h -1 , the reduction roasting time is...

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Abstract

The invention provides a method for enriching nickel concentrate from low-grade lateritic nickel ore by gas-solid reduction reaction with strong selective reduction. Mix the pre-roasted laterite nickel ore evenly with thiosulfate as an additive, and extrude it into columnar particles; then put it into a fixed bed reaction device to heat up in an inert gas N2 atmosphere, and then pass in a mixed gas containing CO reducing gas Reduction roasting, the ore powder after reduction roasting is subjected to magnetic separation, and the magnetic separation minerals are dried into nickel concentrates, and non-magnetic minerals are tailings. The additive of the present invention is a single compound that has the triple properties of alkalinity, sulfate radical, and sulfur generation during the heating process in the laterite nickel ore gas reduction roasting process, avoiding the disadvantages caused by the need for a variety of additive mixtures, and has a strong selection Reduction.

Description

technical field [0001] The invention belongs to the field of chemical mineral processing and metallurgy and chemical science and technology, and particularly relates to a method for enriching nickel concentrate from low-grade laterite nickel ore by gas-solid reduction reaction. Background technique [0002] As the main nickel resource in the world, lateritic nickel ore has a low grade, but with the increasing global demand for nickel, especially the sharp decline in the reserves of nickel sulfide ore-type nickel resources, it has become the nickel resource that the global nickel industry is focusing on developing. Because the grade of laterite nickel ore is low and nickel exists in the form of silicates, it is difficult to enrich it by traditional physical beneficiation methods. Therefore, chemical methods are used to treat laterite nickel ore to achieve the enrichment of nickel ore. The current chemical treatment methods include: pressurized acid immersion method, reduction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B1/00
Inventor 上官炬史鹏政杜文广杨松刘守军
Owner TAIYUAN UNIV OF TECH
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