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Method for precipitating iron from goethite containing ferro-nickel mixed solution

A mixed solution and goethite technology, applied in the direction of improving process efficiency, can solve the problems of high cost of jarosite precipitating iron, complicated operation, etc., and achieve complete separation of nickel and iron, simple process path and low operating cost. Effect

Active Publication Date: 2014-04-23
江苏仁欣环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the disadvantages of high cost and complicated operation of precipitation of iron by jarosite in the existing nickel-iron mixed solution, the present invention provides a kind of goethite precipitation with small investment, simple process, low energy consumption, low production cost and complete separation of nickel and iron. iron method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Laterite nickel ore sulfuric acid leaching solution (nickel-iron mixed solution) 2m 3 , and its chemical composition is shown in the table below

[0026] pH

[0027] 1.5

[0028] will be 2m 3 The nickel-iron mixed solution is loaded into 2.5m 3 In the stirring tank, stir at room temperature, add 3.6kg30wt% industrial H 2 o 2 , stirred for 30 minutes, Fe in the solution 2+ ≤0.01g / L. As a pre-precipitation solution.

[0029] at another 2.5m 3 Add 200kg of water into the stirring tank, add the pre-precipitation solution, adjust the pH value of the water to 4.0, and heat it to 20°C with steam to serve as the reaction solution.

[0030] The pre-sinking iron solution is used at a rate of 0.2m per hour 3 The feeding speed is added to the stirred reaction solution, and at the same time, water is added to the reaction solution: magnesium hydroxide slurry with a mass ratio of magnesium hydroxide=3:1, the pH value of the reaction solution is kept at 4.0...

Embodiment 2

[0039] Laterite nickel ore sulfuric acid leaching solution (nickel-iron mixed solution) 8m 3 , and its chemical composition is shown in the table below

[0040] pH

[0041] will be 8m 3 The nickel-iron mixed solution is loaded into 12m 3 In the stirring tank, stir at room temperature, add 78kg30% industrial H 2 o 2 , stirred for 30 minutes, Fe in the solution 2+ ≤0.01g / L. As a pre-precipitation solution.

[0042] in another 12m 3 Liquor 1m after the heavy iron of embodiment 1 in the stirring tank 3 , add a small amount of preprecipitating iron solution, adjust the pH value of the water to 2.5, and heat it to 80°C with steam as the reaction solution.

[0043] The pre-sinking iron solution is used at a rate of 2.4m per hour 3 The speed is added in the stirred reaction liquid, simultaneously, in the reaction liquid, add water: the magnesia slurry of magnesium oxide mass ratio=4:1, keep the pH value of reaction liquid 2.5, heat, keep the temperature of reaction ...

Embodiment 3

[0052] Laterite nickel ore sulfuric acid leaching solution (nickel-iron mixed solution) 2m 3 , and its chemical composition is shown in the table below

[0053] pH

Ni g / L

Total Fe g / L

Mg g / L

Fe 2+ g / L

1.5

2.4

6.3

22

1.5

[0054] will be 2m 3 The nickel-iron mixed solution is loaded into 2.5m 3 In the stirring tank, stir at room temperature, add 3.6kg30wt% industrial H 2 o 2 , stirred for 30 minutes, Fe in the solution 2+ ≤0.01g / L. As a pre-precipitation solution.

[0055] at another 2.5m3 Add 150kg of water into the stirring tank, add the pre-precipitation solution, adjust the pH value of the water to 3.3, and heat it to 50°C with steam to serve as the reaction solution.

[0056] The pre-sinking iron solution is used at a rate of 0.2m per hour 3 The feeding speed is added to the stirred reaction solution, and at the same time, water is added to the reaction solution: magnesium hydroxide slurry with a mass ratio o...

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Abstract

The invention discloses a method for precipitating iron from goethite containing a ferro-nickel mixed solution. The method comprises the following steps: slowly adding a mixed solution containing nickel sulfate and ferric sulfate into a solution of which the Fe<3+> content is less than or equal to 1g / L, and stirring while controlling the reaction temperature to be 20-80 DEG C and the PH to be 2.5-4.0, so that goethite precipitate is generated through Fe<3+>. The chemical precipitation is good in filtering performance and easy to wash, and complete ferro-nickel separation can be realized. The precipitated goethite is high in iron content and can serve as coarse iron ore for sales. The process is variable in production scale, wide in application, simple in process route, low in investment, low in energy consumption, good in nickel-iron separation effect, simple and convenient to operate and low in production cost, the environment is not polluted, nickel-iron separation is realized in the process of precipitating iron from the nickel sulfate and ferric sulfate mixed solution, and an extremely effective and economic and applicable way is provided for iron recycling.

Description

technical field [0001] The invention relates to a method for precipitating iron from goethite in a nickel-iron mixed solution, belonging to the field of resource recycling. Background technique [0002] Iron is the most common impurity element in hydrometallurgy. In the hydrometallurgy process of nickel, especially the hydrometallurgy of laterite nickel ore, there is a process of separation of iron and nickel. The traditional method is to use the jarosite method to precipitate iron. The disadvantage of jarosite precipitation of iron is that the temperature requirement is relatively high, 90-95; the reaction time at ℃ is long, 4h; the auxiliary material sodium sulfate needs to be added. Lead to higher cost of precipitated iron. [0003] Goethite is a kind of iron oxyhydroxide, at normal pressure, 20-80, ℃ PH2.5-5.5, Fe 3+ Within 2g / L, goethite ( -FeOOH) is the most likely product of ferric hydrolysis. [0004] Goethite precipitated iron was first used in the refining of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B23/00
CPCY02P10/20
Inventor 江山王泽强
Owner 江苏仁欣环保科技有限公司
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