Method for removing iron from low-nickel sulfonium nitric acid leaching solution through pyrolysis

A technology of leachate and ferric nitrate, applied in the field of iron removal from nickel-cobalt nitrate solution and iron removal from nitrate solution, can solve the problems of high iron removal cost and low metal recovery rate, and achieve low cost, nickel-cobalt The recovery rate is high, which is beneficial to the effect of subsequent purification

Active Publication Date: 2017-11-03
甘肃金川镍钴新材料技术创新中心有限公司
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AI Technical Summary

Problems solved by technology

[0004] The present invention aims at the problems of high iron removal cost and low metal recovery rate when the traditional iron removal process is applied to low-nickel matte nitric acid leaching solution with high nickel-copper-iron content and complex composition. Features, providing a method of iron removal with simple process, low cost and high metal recovery rate

Method used

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  • Method for removing iron from low-nickel sulfonium nitric acid leaching solution through pyrolysis
  • Method for removing iron from low-nickel sulfonium nitric acid leaching solution through pyrolysis
  • Method for removing iron from low-nickel sulfonium nitric acid leaching solution through pyrolysis

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Effect test

Embodiment 1

[0011] The composition of a low-nickel sulfur nitric acid leaching solution is shown in Table 1.

[0012] Table 1 Low nickel sulfonium nitric acid leaching solution composition (g / L)

[0013]

[0014] Measure 4L of the above solution, heat it to 100~150℃, react for 1~5h, pyrolyze to produce iron slag, NOx and water are recovered and recycled. After the reaction is completed and filtered, the filter residue is hydrolyzed iron slag, and the filtrate is the liquid after iron removal.

[0015] Test results: 397.4g of iron slag was produced, and 1985ml of liquid after iron removal. Table 2 shows the liquid composition, iron slag composition and slag-based iron removal rate after iron removal.

[0016] Table 2 Iron removal results

[0017]

Embodiment 2

[0019] The composition of a low-nickel sulfur nitric acid leaching solution is shown in Table 3.

[0020] Table 3 Low nickel sulfonium nitric acid leaching solution composition (g / L)

[0021]

[0022] Measure 8L of the above solution, heat it to 100~150℃, react for 1~5h, pyrolyze to produce iron slag, NOx and water are recovered and recycled. After the reaction is completed and filtered, the filter residue is hydrolyzed iron slag, and the filtrate is the liquid after iron removal.

[0023] Test results: 756.3g of iron slag and 4280ml of solution were produced. The liquid composition, iron slag composition and slag-based iron removal rate after iron removal are shown in Table 4.

[0024] Table 4 Iron removal results

[0025]

Embodiment 3

[0027] The composition of a low-nickel sulfur nitric acid leaching solution is shown in Table 5.

[0028] Table 5 Low nickel sulfonium nitric acid leaching solution composition (g / L)

[0029]

[0030] Measure 10L of the above solution, heat it to 100~150℃, react for 1~5h, pyrolyze to produce iron slag, NOx and water are recovered and recycled. After the reaction is completed and filtered, the filter residue is hydrolyzed iron slag, and the filtrate is the liquid after iron removal.

[0031] Test results: 973.5g of iron slag and 5100ml of solution were produced. Table 6 shows the liquid composition, iron slag composition and slag-based iron removal rate after iron removal.

[0032] Table 6 Iron removal results

[0033]

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Abstract

The invention discloses a method for removing iron from a low-nickel sulfonium nitric acid leaching solution through pyrolysis. According to the method, the iron in the nickel / cobalt nitrate solution is removed through a high-temperature pyrolysis method; molten iron is decomposed into Fe2O3.H2O to be precipitated; the iron content of iron slag is greater than 50%, and through simple calcinations, the iron slag can be treated as iron ore concentrate; and the iron slag includes a small amount of valuable metal, and the recovery rate of nickel / cobalt is high. By means of the method, no impurity is introduced into the whole process; the procedure is simple; the application scope is wide; cost is low; subsequent purification can be conducted conveniently; generated nitric oxide can be recycled; and the method is a new environment-friendly iron-removal process which makes breakthrough.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal hydrometallurgy, and relates to a method for removing iron from a nickel-cobalt nitrate solution, in particular to a method for removing iron from a nitrate solution containing nickel, copper and iron with relatively high and complex components . Background technique [0002] Low-nickel matte is the product of oxidative smelting of the beneficiation concentrate of nickel sulfide ore. The iron content in low-nickel matte is about 1 to 1.5 times that of nickel. After leaching low-nickel matte with nitric acid, the typical composition of the leaching solution obtained is (g / L): Ni 50~60, Co 1~2, Cu30~35, Fe 50~60, NO 3 - 280~300. In the leaching solution, iron exists in the form of positive ferric ions, and there is a certain leaching residual acid. Therefore, the oxidation-reduction potential of the leaching solution is usually above 700mv. [0003] In the traditional hydrometallurgic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B23/00C22B15/00
CPCC22B3/44C22B15/0089C22B23/0461Y02P10/20
Inventor 刘玉强李尚勇张晗王书友张娟张树峰李娟李维舟田忠元欧晓健席海龙李全陈彩霞高晓婷郁洪波朱锐伦孔令军路思阳王钦马天飞
Owner 甘肃金川镍钴新材料技术创新中心有限公司
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