Method for adding additive agent in reducing roasting process of laterite nickle mine

A laterite nickel ore and additive technology, which is applied in the field of adding additives in the reduction roasting process of laterite nickel ore, can solve the problems of increasing the amount of segregating agent chloride, increasing the consumption of raw materials, and high production costs, so as to reduce the cost of chemical consumption and strengthen the metal effect, adding a small amount of effect

Inactive Publication Date: 2009-04-29
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The increase in the amount of segregating agent chloride will not only increase the consumption of raw materials, resulting in high production costs, but also cause chlorine pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Laterite nickel ore contains 1.38% Ni, 32.1% Fe and 12.7% Mg.

[0034] Take 100 parts of laterite nickel ore and grind to -200 mesh, accounting for 90%, add 6 parts of pulverized coal and additives (recipe and dosage are shown in Table 2), mix and grind them, and use a spherical egg forming machine to make 10-15mm pellets. Reduction roasting was carried out at 900° C. for 2 hours in a muffle furnace. The obtained reduced calcine is subjected to wet ball milling, the pulp concentration is 40%, and the grinding fineness is -200 mesh, accounting for 90%; the pulp is magnetically separated under the condition of a magnetic field strength of 8000 gauss, and the obtained concentrate contains Ni 4.89%, Fe 79.8%, the recovery rate of nickel is 91.5%.

[0035]Table 2 The additive formula and consumption of embodiment 1

[0036] component name specific compound Amount, % (relative to the quality of laterite nickel ore) chloride calcium chloride 5％ Acc...

Embodiment 2

[0038] Low-iron and high-magnesium laterite nickel ore, the chemical composition contains Ni 1.95%, Fe 15.9%, Mg 17.8%.

[0039] Take 100 parts of laterite nickel ore and grind it to -200 mesh, accounting for 70%, add 5 parts of coking coal and additives (see Table 3 for the formula and dosage), mix and grind, and use a spherical egg forming machine to make pellets with a diameter of 10-15mm. The kiln is reduced and fired at 1100°C for 1.5 hours. The obtained reduced calcine is subjected to wet ball milling, the pulp concentration is 50%, and the grinding fineness is -200 mesh, accounting for 80%; the pulp is magnetically separated under the condition of a magnetic field strength of 9000 gauss, and the obtained concentrate contains 8.36% Ni, Fe 75.1%, the recovery rate of nickel is 95.2%.

[0040] Table 3 The additive formula and consumption of embodiment 2

[0041] component name specific compound Amount, % (relative to the quality of laterite nickel ore) ...

Embodiment 3

[0043] High-iron and low-magnesium laterite nickel ore, the chemical composition contains Ni 0.91%, Fe 47.8%, Mg 17.9%.

[0044] Take 100 parts of laterite nickel ore and grind it to -100 mesh, accounting for 90%, add 12 parts of pulverized coal and combined segregant (see Table 4 for the formula and dosage), mix and grind it, and use a spherical egg forming machine to make pellets of 10-15mm , using a rotary kiln to reduce and roast at 1250 ° C for 0.5 hours. The obtained reduced calcine is subjected to wet ball milling, the pulp concentration is 50%, and the grinding fineness is -400 mesh, accounting for 70%. 81.9%, the recovery rate of nickel is 88.8%.

[0045] The additive formula and consumption of table 4 embodiment 3

[0046] component name specific compound Amount, % (relative to the quality of laterite nickel ore) chloride calcium chloride 0％ Accelerator Sodium carbonate 6％ Nucleating agent Reduced iron powder 1％ Sulfur fix...

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Abstract

The invention discloses a method for adding an additive in the reduction roasting process of terra rossa nickel ore. The terra rossa nickel ore is ground to -200 to -100 meshes and is 70 to 90 percent of the mass thereof. A chloride is added into the terra rossa nickel ore as a segregation agent; a sodium compound is added into the terra rossa nickel ore as a promoter; and reduced iron powder is taken as a nucleator and a calcium compound is taken as a sulphur-fixing agent. The adding dosage of the chloride is 0 to 10 percent of the mass of the terra rossa nickel ore; the adding dosage of the sodium compound is 1 to 10 percent of the mass of the terra rossa nickel ore; the adding dosage of the reduced iron powder is 0 to 3 percent of the mass of the terra rossa nickel ore; and the adding dosage of the calcium compound is 1 to 10 percent of the mass of the terra rossa nickel ore. The method is suitable for the reduction roasting process of the terra rossa nickel ore with the high nickel silicate content, can greatly reduce the dosage of calcium chloride, and so on, reduce the equipment corrosion and the environmental pollution caused by chlorine, remarkably improve the metallization degree and the segregation effect during the reduction roasting process of the terra rossa nickel ore, and consequently reach the aim of improving the recovery rate or grade of nickel.

Description

technical field [0001] The invention relates to a method for adding additives in the reduction roasting process of laterite nickel ore. Background technique [0002] Laterite nickel ore is formed by weathering, leaching, alteration, and enrichment of nickel-containing rocks. It is a loose clay-like ore composed of iron, aluminum, silicon, nickel and other hydrous oxides. Now proven laterite nickel Mineral resources are mostly distributed along the Tropic of Cancer, such as Australia, Papua New Guinea, New Caledonia, Indonesia, the Philippines and Cuba. Laterite ore was the main resource of nickel in the early days. The development of rich laterite ore in New Caledonia began at the end of the 19th century. The discovery of Sudbury sulfide ore in the early 20th century made people focus on sulfide ore. The advantage of sulfide ore as the main resource of nickel cannot be questioned so far, but laterite ore, which accounts for 70% of the world's land-based nickel resources, on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B1/02
Inventor 王晖符剑刚凌天鹰叶红齐
Owner CENT SOUTH UNIV
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