Method for extracting molybdenum and nickel and enriching precious metals from nickel and molybdenum ores

A technology for nickel-molybdenum ore and precious metals, which is applied in the field of high-efficiency extraction of molybdenum and nickel and enrichment of precious metals, can solve the problems of limited use, reduced yield of molybdenum and nickel, and small processing capacity, achieves high comprehensive utilization rate, and is beneficial to The effect of extracting and reducing nickel content in slag

Active Publication Date: 2014-02-05
CENT SOUTH UNIV +1
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The common pyrotechnic process for processing nickel-molybdenum ore is: crush nickel-molybdenum ore, oxidize and roast it for desulfurization, then add lime and coke to the roasted clinker, and directly heat it in a small blast furnace or an electric furnace at a temperature higher than 1500°C. Reduction refinement is made into coarse nickel-molybdenum alloy. The obtained nickel-molybdenum alloy contains 15-20% molybdenum, 8-20% nickel, phosphorus > 0.6%, and sulfur > 1%. Although this method has the advantages of simple equipment and process, and large raw material processing capacity , low production cost, the yield of molybdenum and nickel can basically meet the requirements, etc., but its disadvantages are that the smelting product is a molybdenum-nickel alloy eutectic, molybdenum and nickel cannot be separated, and the harmful impurities in the alloy phosphorus and The sulfur content is high and the use is limited. Subsequent molybdenum and nickel separation and impurity removal treatment must b

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The nickel-molybdenum ore used contains 3.0% molybdenum, 4.2% nickel, 21.5% sulfur, 10% carbon, 12.6% iron, 16.5% SiO2, 6.5% CaO, Ag20g / t, Au+Pd+Pt3g / t.

[0035] The nickel-molybdenum ore is ground to a particle size of ≤1mm, and oxidized and roasted at 600°C, and the obtained roasted clinker contains 9% S. The flue gas produced by oxidation roasting is used to make sulfuric acid.

[0036] Grind the agglomerated roasted clinker to a particle size of ≤1mm, and then add sodium carbonate and coke powder with a particle size of ≤1mm (fixed carbon content>80% ) and mix thoroughly, and then make the mixture into pellets of about Ф30. After the pellets are dried (moisture content below 2%), they are sent to an electric furnace for melting at 1280°C, and the furnace is kept warm for 20 minutes after all the furnace materials are melted. Under the condition of heat preservation, the reaction mixture is layered due to different densities, the upper layer is alkali slag, and the...

Embodiment 2

[0039] The nickel-molybdenum ore used contains 3.0% molybdenum, 4.2% nickel, 21.5% sulfur, 10% carbon, 12.6% iron, SiO 2 16.5%, CaO6.5%, Ag20g / t, Au+Pd+Pt3g / t.

[0040] The nickel-molybdenum ore is ground to a particle size of ≤1mm, and oxidized and roasted at 800°C, and the obtained roasted clinker contains 3% S. The flue gas produced by oxidation roasting is used to make sulfuric acid.

[0041] Grind the agglomerated roasted clinker to a particle size of ≤1mm, and then add sodium carbonate and coke powder with a particle size of ≤1mm (fixed carbon content >80% ) and mix thoroughly, and then make the mixture into pellets of about Ф30. After the pellets are dried, the water content is less than 2%, and they are sent to the electric furnace for melting at 1550°C, and the heat preservation is kept for 40 minutes after the furnace materials are completely melted. The obtained smelted nickel matte contains 31% nickel, 6% sulfur, 55% Fe, 0.3% Mo, 126g / t Ag, and 18g / t Au+Pd+Pt. ...

Embodiment 3

[0044] The nickel-molybdenum ore used contains 3.0% molybdenum, 4.2% nickel, 21.5% sulfur, 10% carbon, 12.6% iron, 16.5% SiO2, 6.5% CaO, Ag20g / t, Au+Pd+Pt3g / t.

[0045] The nickel-molybdenum ore is ground to a particle size of ≤1mm, oxidized and roasted at 700°C, and the obtained roasted clinker contains 7% S. The flue gas produced by oxidation roasting is used to make sulfuric acid.

[0046] Grind the agglomerated roasted clinker to a particle size of ≤1mm, and then add sodium carbonate and coke powder with a particle size of ≤1mm (fixed carbon content>80% ) and mix thoroughly, and then make the mixture into pellets of about Ф30. After the pellets are dried, they are sent to an electric furnace for melting at 1400°C, and the heat is kept for 30 minutes after all the furnace materials are melted. The obtained smelted nickel matte contains 35% nickel, 30% sulfur, 28% Fe, 0.2% Mo, 140g / t Ag, and 20g / t Au+Pd+Pt.

[0047] The obtained alkali slag was leached twice with water at...

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Abstract

The invention provides a method for extracting molybdenum and nickel and enriching precious metals from nickel and molybdenum ores. The method comprises the steps of (1) carrying out oxidized desulfurization and roasting; (2) smelting at high temperature to separate nickel and molybdenum: heating to 1250-1550 DEG C to enable the mixed furnace charge to be fused, and then, preserving the heat for 20-40min; (3) leaching and extracting the molybdenum for the first time; (4) leaching and extracting the molybdenum for the second time. The method provided by the invention is only used for removing sulfur in the nickel and molybdenum ores to be below 10%, so that the long roasting process is avoided, SO2 in the obtained smoke is high in concentration and can be directly used for preparing acids, meanwhile, the roasting time is greatly shortened, the production efficiency is remarkably increased, and the operation difficulty is lowered. The molybdenum can be converted into sodium molybdate and reserved in molten alkaline slag through adding sodium carbonate into the roasted clinker and melting the sodium carbonate under an alkaline condition, while the nickel is produced in an iced nickel or ferronickel way, so that the efficient separation of the nickel and the molybdenum is realized. The sodium carbonate is added in a melting process, so that the melting point and viscosity of the molten slag are reduced, and the iced nickel or ferronickel can be favorably settled and enriched.

Description

technical field [0001] The invention belongs to the technical field of mineral extraction metallurgy, and relates to a method for efficiently extracting molybdenum and nickel from nickel-molybdenum ore and enriching precious metals. Background technique [0002] There are a large number of nickel-molybdenum deposits in my country's Guizhou Province and Xiangxi, Hunan and other regions. This kind of mineral is a polymetallic associated sulfide ore. Due to the different ore-forming conditions and the location of the region, the associated valuable elements are also different, but it is mainly molybdenum and nickel. A small amount of tungsten, vanadium and gold, silver, platinum, palladium and other precious metals are usually called nickel-molybdenum ore or molybdenum-nickel ore. This kind of nickel-molybdenum ore containing molybdenum and nickel has a wide distribution area and large reserves, and the grades of molybdenum and nickel are relatively high (compared with molybde...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/12C22B7/04C22B23/00C22B11/00C22B34/34
CPCY02P10/20
Inventor 霍广生彭超曾璐琦宋琼卢晓颖朱和平
Owner CENT SOUTH UNIV
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