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

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...