CN-122012943-A - Method for preparing alloy from crude cobalt sulfide ore

Abstract

The invention relates to the field of alloy production, and discloses a method for preparing an alloy from crude cobalt sulfide ore. The method comprises the steps of oxidizing and roasting crude cobalt sulfide ore obtained in a flotation desulfurization process, grinding the roasted cobalt sulfide ore, mixing the ground mineral powder with a reducing agent, limestone and sodium humate to prepare lump ore, putting the lump ore into a rotary kiln for roasting and reducing to obtain reduced iron slag, and putting the reduced iron slag into an ore heating furnace for smelting to obtain crude cobalt-nickel-iron alloy. The method of the invention efficiently recovers low-grade cobalt and sulfur resources which are difficult to economically treat by the traditional dressing and smelting method through oxidation roasting desulfurization and reduction and submerged arc furnace melting treatment, not only effectively enriches cobalt and nickel elements which are dispersed in occurrence state, but also synchronously recovers iron elements in the resources, realizes the collaborative recovery of multi-metals such as cobalt, nickel, iron and the like, and improves the total utilization rate of mineral resources. The method has the advantages of short flow, conventional equipment, stable operation and easy large-scale and continuous industrial application.

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

20260512

Application Date

20260211

Claims (10)

1. 1. A method for preparing an alloy from crude cobalt sulfide ore, which is characterized by comprising the following steps: oxidizing and roasting the crude cobalt sulfide ore obtained in the flotation desulfurization process; Grinding the roasted cobalt sulfide ore; Mixing the ground mineral powder with a reducing agent, limestone and sodium humate to prepare lump ore; placing the lump ore into a rotary kiln for roasting and reducing to obtain reduced iron slag; and (3) putting the reduced iron slag into an ore smelting furnace for smelting to obtain the crude cobalt-nickel-iron alloy.
2. 2. The method for preparing an alloy from crude cobalt sulfide ore according to claim 1, wherein the oxidizing roasting temperature is 700-800 ℃ and the time is 2-4 hours.
3. 3. The method for preparing an alloy from crude cobalt sulfide ore according to claim 1, wherein the ore grinding time is 3 to 5 minutes.
4. 4. The method for preparing an alloy from crude cobalt sulfide ore according to claim 1, wherein the reducing agent is selected from coke powder or coal dust, and the mass ratio of the mineral powder to the reducing agent is 8:2 to 9:1.
5. 5. The method for preparing an alloy from crude cobalt sulfide ore according to claim 1, wherein the mass ratio of the mineral powder to the limestone is 100:1-3.
6. 6. The method for preparing an alloy from crude cobalt sulfate according to claim 1, wherein the mass ratio of the mineral powder to sodium humate is 100:1-3.
7. 7. The method for producing an alloy of claim 1, wherein the calcination reduction in the rotary kiln comprises three stages in sequence: a drying stage, namely, normal temperature is between 450 and 500 ℃, and the temperature rising rate is between 5 and 15 ℃ per minute; a roasting stage, namely heating to 850-900 ℃ at a temperature rising rate of 15-30 ℃ per minute and preserving heat for 15-30 minutes; and in the reduction stage, heating to 1100-1250 ℃ at a heating rate of 10-15 ℃ per minute and preserving heat for 30-90 minutes.
8. 8. The method for preparing an alloy from crude cobalt sulfide ore according to claim 1, wherein the step of placing the reduced iron slag into a submerged arc furnace for smelting comprises controlling the voltage of the submerged arc furnace for smelting to be 220V, the current to be 110A, the smelting temperature to be 1500-1550 ℃, the smelting time to be 2-4 h, and the electrode to be lifted up and down for 0.3-0.5 m per hour.
9. 9. The method for preparing an alloy from crude cobalt-nickel-iron alloy according to claim 1, wherein the total content of cobalt and nickel in the prepared crude cobalt-nickel-iron alloy is 20% -30%.
10. 10. The method for preparing an alloy from crude cobalt sulfide ore according to claim 1, wherein sulfur dioxide flue gas generated by oxidative roasting is used for preparing acid after being purified and dedusted.

Description

Method for preparing alloy from crude cobalt sulfide ore Technical Field The invention relates to the field of alloy production, in particular to a method for preparing an alloy from crude cobalt sulfide ore. Background The Panxi area is the largest vanadium titano-magnetite resource production area in China, and the produced ore in the area not only contains rich iron, vanadium and titanium, but also contains rich cobalt, sulfur and other resources, thereby having high industrial utilization value. The main flow process of the vanadium titano-magnetite comprises the steps of sequentially carrying out stage grinding, weak magnetic separation of iron, strong magnetic separation of titanium from tailings of iron separation, strong magnetic separation of titanium rough concentrate for flotation desulfurization, and flotation of ilmenite, so that iron concentrate, titanium concentrate and cobalt sulfide concentrate are obtained. The method is limited by the properties of the raw ore of vanadium titano-magnetite in the area, the cobalt taste in the sulfur-cobalt concentrate recovered by flotation in the flotation desulfurization stage of the titanium concentrate is lower, the cobalt content is generally below 0.3%, the occurrence state of cobalt is extremely dispersed, the symbiotic relationship is compact, the cobalt grade of the product obtained after flotation enrichment is still lower, the follow-up smelting recovery cost is high due to the excessively low cobalt grade, and the product cannot compete with main cobalt resources, so that the byproduct can not be used as a cobalt raw material in a large-scale and commercial manner all the time. Regarding the subsequent treatment of the flotation desulfurization recovery of the sulfur-cobalt concentrate, the prior art mostly surrounds the separation of the cobalt concentrate and the sulfur concentrate or the separation and extraction of valuable metals such as cobalt and the like. The patent CN112871459A discloses a flotation separation medicament system of a sulfur cobalt ore, which comprises a regulator, a foaming agent, a cobalt collector and an inhibitor for low cobalt sulfide and aluminosilicate gangue minerals, wherein the cobalt collector comprises ethyl xanthate, tertiary dodecyl mercaptan and diethyl sodium dithiocarbamate, the inhibitor comprises sodium hydroxide, sodium thiosulfate and sodium thioglycolate, and the foaming agent comprises methyl carbitol. The deep flotation scheme can enrich cobalt to a certain extent, but the grade of the obtained cobalt concentrate is still low, usually only about 0.8%, and the commercial grade cobalt concentrate standard which can be directly used for smelting processing is not reached, so that the economic value is limited. The process depends on a complex medicament system, and relates to accurate proportioning and addition of various collecting agents and inhibitors, so that the medicament cost is high and the flow control is complex. The patent CN109234522A discloses a comprehensive recovery treatment method of cobalt-sulfur concentrate. The method comprises the steps of oxidizing, boiling and roasting cobalt-sulfur concentrate to obtain calcine and SO 2 flue gas, purifying and dedusting the SO 2 flue gas, then enabling the flue gas to enter a flue gas acid making system for making acid, cooling the calcine, ball milling the calcine to obtain fine particles, pulping and pre-soaking the fine particles, continuously selectively leaching the fine particles by a continuous pressure leaching system, pre-neutralizing lime milk pulp to obtain supernatant and filter residues, treating the supernatant, enabling the supernatant to enter a copper extraction system for extraction to obtain cathode copper, electrodeposited liquid and raffinate, washing the filter residues to obtain washing liquid, pulping and pre-soaking the calcine by taking the electrodeposited liquid and the washing liquid as pulping liquid, and enabling the raffinate to enter a cobalt precipitation process, a magnesium precipitation process to obtain cobalt and magnesium solid materials, and storing the cobalt and magnesium solid materials in a slag yard. The method adopts hydrometallurgy to extract and recycle cobalt and copper metals in cobalt-sulfur concentrate, but has long process flow, relates to a plurality of operations with high energy consumption and high investment such as roasting, leaching, extraction, electrodeposition, precipitation and the like, and has huge equipment investment and high running cost. The patent CN101191122A discloses a biological heap leaching process of low-grade cobalt-containing sulfur concentrate, which comprises the steps of firstly granulating and solidifying fine-grained sulfur concentrate by adding a binder and a crushed stone carrier to construct a heap with good permeability, then pre-oxidizing by mesophilic acidophilic bacteria, switching to moderate thermophilic acidophilic bacteria for drip leaching, dissol