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CN-121972285-A - Method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate

CN121972285ACN 121972285 ACN121972285 ACN 121972285ACN-121972285-A

Abstract

The invention relates to the field of mineral separation, and discloses a method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate. The method comprises the steps of oxidizing and roasting sulfur-cobalt rough concentrate in an air atmosphere to obtain oxidized roasting mineral powder, mixing the oxidized roasting mineral powder with limestone, boride and coal dust, carrying out high-temperature reduction to obtain a reduction product, carrying out ore grinding treatment on the reduction product to obtain finely ground minerals, and carrying out weak magnetic separation on the finely ground minerals to obtain weak magnetic concentrate and weak magnetic tailings, wherein the weak magnetic concentrate is high-nickel cobalt concentrate. The method improves the enrichment rate of cobalt and nickel and obtains high nickel cobalt concentrate through oxidation roasting, reduction treatment, addition of additives in the reduction raw material, optimization of reduction temperature and the like.

Inventors

  • YANG DAOGUANG
  • WANG ZHILIN
  • HE MINGQIAN
  • ZHANG LILI

Assignees

  • 攀钢集团攀枝花钢铁研究院有限公司

Dates

Publication Date
20260505
Application Date
20260211

Claims (10)

  1. 1. A method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate, which is characterized by comprising the following steps: oxidizing and roasting the cobalt sulfide rough concentrate in an air atmosphere to obtain oxidized roasting mineral powder; Mixing the oxidized roasting mineral powder with limestone, boride and coal dust, and then carrying out high-temperature reduction to obtain a reduction product; grinding the reduction product to obtain finely ground minerals; and carrying out low-intensity magnetic separation on the finely ground minerals to obtain low-intensity magnetic concentrate and low-intensity magnetic tailings, wherein the low-intensity magnetic concentrate is the high-nickel cobalt concentrate.
  2. 2. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, wherein the oxidizing roasting temperature is 600-800 ℃ and the roasting time is 3-4 hours.
  3. 3. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, wherein the mass ratio of the oxidized roasting mineral powder, limestone, boride and coal dust is (80-90): (1-3): (10-20).
  4. 4. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, wherein the boride is at least one selected from B 2 O 3 and boric acid.
  5. 5. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, wherein the pulverized coal is anthracite powder, and the particle size-200 mesh ratio of the anthracite powder is more than 95%.
  6. 6. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, wherein the mass percentage of CaO in the limestone is 40% -50%.
  7. 7. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, wherein the high temperature reduction temperature is 1200-1250 ℃ and the time is 2-3 hours.
  8. 8. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, wherein the grinding treatment adopts planetary grinding, and the grinding time is 30-40 min.
  9. 9. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, further comprising recovering the pulverized coal from the weak magnetic tailings by flotation and recycling the recovered pulverized coal for high temperature reduction treatment, wherein the foaming agent used for the flotation is No. 2 oil, and the collector is kerosene.
  10. 10. The method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate according to claim 1, wherein the mass percentage of cobalt in the high nickel cobalt concentrate is above 5% and the mass percentage of nickel is above 10%.

Description

Method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate Technical Field The invention relates to the field of mineral processing, in particular to a method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate. Background The Panxi area is an important production area of vanadium titano-magnetite resources in China, and ores produced in the area are rich in iron, vanadium and titanium and are accompanied with elements such as cobalt, sulfur, nickel, copper and the like. After multistage crushing, grinding and magnetic separation, the ore can be separated into magnetic concentrate and nonmagnetic tailings, so that iron concentrate serving as a main product is obtained. The tailings after iron separation recover the titanium concentrate through the titanium separation process, and in the process of extracting ilmenite, in order to remove sulfide harmful to the titanium concentrate, a flotation process is adopted to remove sulfide in the titanium rough concentrate before titanium ore flotation. The sulfide obtained by floatation desulfurization is cobalt sulfide rough concentrate, and the main component of the sulfide is cobalt sulfide and is often accompanied with valuable metal elements such as nickel, copper, iron and the like. In order to realize comprehensive utilization of resources and reduce environmental load of solid waste treatment, the rough concentrate is further treated to selectively recover nickel, cobalt, iron and other elements. In the treatment of cobalt sulphur concentrates, industry practice generally employs a high temperature roasting-leaching process. The technology effectively removes sulfur elements through high-temperature roasting, promotes the transformation of metal phases, and then extracts and recovers target metals by acid leaching. However, the process has the defects of higher energy consumption, large chemical reagent usage amount, longer overall process flow and the like, and increases the treatment cost and the environmental burden. Other techniques implement the decomposition of sulfidic minerals in acidic media by wet direct leaching, often using pressurized oxygen leaching or atmospheric catalytic leaching. However, in complex mineral systems, the selective leaching of valuable metals is not effective. In recent years, separation means such as solvent extraction and ion exchange have been advanced, but there are still bottlenecks such as easy aging of an extractant, long separation flow, high reagent cost, and the like for a leachate having a high impurity content. In general, there is still room for further improvement in existing sulfur-cobalt raw concentrate recycling technologies. Disclosure of Invention Aiming at the problems existing in the prior art, the main purpose of the invention is to provide a method for preparing high nickel cobalt concentrate from sulfur cobalt rough concentrate. According to an aspect of the present invention, there is provided a method for preparing high nickel cobalt concentrate from sulphur cobalt concentrate, the method comprising the steps of: oxidizing and roasting the cobalt sulfide rough concentrate in an air atmosphere to obtain oxidized roasting mineral powder; Mixing the oxidized roasting mineral powder with limestone, boride and coal dust, and then carrying out high-temperature reduction to obtain a reduction product; grinding the reduction product to obtain finely ground minerals; and carrying out low-intensity magnetic separation on the finely ground minerals to obtain low-intensity magnetic concentrate and low-intensity magnetic tailings, wherein the low-intensity magnetic concentrate is the high-nickel cobalt concentrate. According to one embodiment of the invention, the oxidizing roasting temperature is 600-800 ℃ and the roasting time is 3-4 hours. According to one embodiment of the invention, the mass ratio of the oxidized roasting mineral powder, the limestone, the boride and the pulverized coal is (80-90)/(1-3)/(10-20). According to one embodiment of the invention, the boride is selected from at least one of B 2O3 and boric acid. According to one embodiment of the invention, the pulverized coal is anthracite coal, and the particle size of the anthracite coal-200 meshes accounts for more than 95%. According to one embodiment of the invention, the mass percentage of CaO in the limestone is 40% -50%. According to one embodiment of the invention, the high-temperature reduction is performed at a temperature of 1200-1250 ℃ for 2-3 hours. According to one embodiment of the invention, planetary grinding is adopted in the grinding treatment, and the grinding time is 30-40 min. According to one embodiment of the invention, the method further comprises the steps of recovering the pulverized coal from the weak magnetic tailings by flotation and recycling the recovered pulverized coal for high-temperature reduction treatment, wherein a foaming agent used for the flotatio