Method for selectively leaching nickel and molybdenum from nickel-molybdenum ore

A nickel-molybdenum ore, selective technology, applied in chemical instruments and methods, improvement of process efficiency, inorganic chemistry, etc., can solve the problems of incomplete leaching of molybdenum, low utilization rate of nickel, large consumption of oxidant and acid, etc., to achieve The effect of reducing the difficulty of impurity removal, reducing production costs, and solving pollution problems

Active Publication Date: 2013-05-08
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this process is that the impurity content is high, especially the Fe content, the purification is difficult, and the consumption of oxidant and acid is large.
[0009] CN102268538A proposes a fluidized furnace device for roasting nickel-molybdenum concentrate and the idea of ​​roasting nickel-molybdenum concentrate. This research mainly involves the emission control and recovery of arsenic and sulfur oxides in the roasting tail gas. It is said that the roasting after roasting of this research Sand can achieve selective leaching of nickel and molybdenum, but does not indicate roasting and leaching conditions
Under its optimized conditions, the conversion rate of nickel is still low, a large amount of iron and vanadium are also leached, and the leaching of molybdenum is not complete
[0011] In summary, it can be seen that due to the characteristics of nickel-molybdenum ore itself, there are inevitably problems such as large amount of oxidant added and high impurity leaching rate in the full hydrometallurgy process, making it difficult to obtain better leaching and purification effects
Although the roasting and leaching process can avoid the use of a large amount of oxidants, it often has problems such as low utilization rate of nickel and pollution of the environment by roasting tail gas.

Method used

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  • Method for selectively leaching nickel and molybdenum from nickel-molybdenum ore

Examples

Experimental program
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Effect test

Embodiment 1

[0049] The processed nickel-molybdenum ore contains 7.2% molybdenum, 3.6% nickel and 12.2% iron. Weigh 100g of nickel-molybdenum ore under air conditions, control the oxygen concentration in the furnace atmosphere to 2%~10%, sulfur dioxide concentration 1%~6%, and roast at 650℃ for 2.5h. Weigh 35g of roasted ore into 140ml of sulfuric acid solution with a sulfuric acid concentration of 2.5mol / L, leaching for 3h at 80°C, and filtering to obtain a nickel-molybdenum leaching solution. The leaching rate of nickel is 92.8%, the leaching rate of molybdenum is 96.7%, and the leaching rate of iron is only 16.5%. After the roasting tail gas is cooled and collected by a high-temperature water-cooled dust collecting device, it is passed into a 0.3mol / L ethylenediamine solution, and the initial pH value is adjusted to 7.3 with phosphoric acid, SO 2 The absorption rate is above 98%. The desorption rate of the absorption solution reaches 93% at 103°C. After desorption, the concentration of ...

Embodiment 2

[0051] The processed nickel-molybdenum ore contains 5.6% molybdenum, 3.1% nickel and 14% iron. Weigh 60g of nickel-molybdenum ore in oxygen-enriched air with an oxygen concentration of 40%, control the atmosphere in the furnace to have an oxygen concentration of 5% to 20%, and a sulfur dioxide concentration of 5% to 13%, and roast it at 700°C for 1 hour. Weigh 35g roasted ore and add 70ml sulfuric acid solution with a sulfuric acid concentration of 3.5mol / L, leaching for 3h at 85°C, and filtering to obtain a nickel-molybdenum leaching solution. The leaching rate of nickel is 94.6%, the leaching rate of molybdenum is 97.6%, and the leaching rate of iron is only 21%. The sulphur dioxide tail gas produced by roasting is used for direct acid production.

Embodiment 3

[0053] The processed nickel-molybdenum ore contains 6% molybdenum, 2.6% nickel and 13% iron. Weigh 100g of nickel-molybdenum ore under air conditions, control the oxygen concentration in the furnace atmosphere to 2%~10%, sulfur dioxide concentration 1%~6%, and roast at 625℃ for 3h. Weigh 35g roasted ore and add 105ml sulfuric acid solution with a sulfuric acid concentration of 0.5mol / L, leaching for 3h at 70°C, and filtering to obtain a nickel-molybdenum leaching solution. The leaching rate of nickel is 91.6%, the leaching rate of molybdenum is 95.6%, and the leaching rate of iron is only 15.6%.

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Abstract

The invention discloses a method for selectively leaching nickel and molybdenum from nickel-molybdenum ore. Particularly, in the method, the selective sulfating roasting of the nickel-molybdenum ore is realized by controlling roasting atmosphere and temperature; amd a roasted product obtained through roasting is leached by using a sulphuric acid solution. The method disclosed by the invention has the advantages of low leaching ratio of iron impurities, no environment pollution and low cost, can be used for high-selectively simultaneously leaching nickel and molybdenum from the nickel-molybdenum ore and can be widely applied to industrialized production.

Description

Technical field [0001] The invention relates to a method for selectively leaching nickel and molybdenum from nickel-molybdenum ore, and belongs to the technical field of mineral extraction. Background technique [0002] The nickel-molybdenum ore was built in the southern sedimentary rocks of the early Cambrian century. It is rich in valuable metals Ni, Mo, V, W and accompanied by the mineralization of precious metals such as Au, Ag, and Pt. The grade of molybdenum is generally 2~11%, and nickel The content of molybdenum is generally 35~70%, and the grade of iron is generally 10~15%. It is mainly distributed in parts of eastern Yunnan, central Guizhou, western Hunan and Zhejiang. Nickel and molybdenum in nickel-molybdenum ore mainly exist in the form of sulfides. The occurrence state of nickel varies from place to place, and it mainly occurs in minerals such as skutterite, arsenite, sulphur-nickel ore, goethite and pyrite. However, the occurrence state of molybdenum is the same ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/06C22B3/08C22B23/00C22B34/34C01B17/74
CPCY02P10/20
Inventor 赵中伟贾帅广陈星宇李青刚刘旭恒李江涛
Owner CENT SOUTH UNIV
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