The method that reclaims magnesium and prepares magnesium hydroxide from cobalt-nickel industry cobalt-containing magnesium solution
A magnesium hydroxide and magnesium solution technology, applied in the preparation of magnesium hydroxide and cobalt compounds, chemical instruments and methods, etc., to achieve the effects of smooth filtration, reduced emissions, and reduced impact
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Embodiment 1
[0025] like figure 1 As shown, the method for preparing magnesium hydroxide by reclaiming magnesium from the cobalt-nickel industry cobalt-containing magnesium solution provided by this embodiment one includes the following steps:
[0026] Process one (P1):
[0027] Get cobalt-containing magnesium solution after extracting nickel, its cobalt content 30g / L, magnesium content 25g / L, at first adjust pH value to 7.3 with the sodium hydroxide of 3mol / L, temperature is controlled at 55 ℃, stirring speed 150rpm, and maintain Keep the pH value unchanged for 10 minutes, so that the cobalt is fully precipitated, and the concentration of cobalt in the solution after cobalt precipitation is 490mg / L;
[0028] Process two (P2):
[0029] Filter with a plate and frame filter press to obtain filtrate 1 and filter cake 1, add water to filter cake 1 for slurry, add water to adjust the slurry concentration to 15wt.%, water temperature 60 ° C, stirring speed during slurry is 250rpm, stir for 5mi...
Embodiment 2
[0042] like figure 1 As shown, the method for preparing magnesium hydroxide by reclaiming magnesium from the cobalt-nickel industry cobalt-containing magnesium solution provided by this embodiment two includes the following steps:
[0043] Process one (P1):
[0044] Get cobalt-containing magnesium solution after extracting nickel, its cobalt content 56g / L, magnesium content 30g / L, at first adjust pH value to 7.8 with the sodium hydroxide of 6mol / L, temperature is controlled at 40 ℃, stirring speed 250rpm, and maintain Keep the pH value unchanged for 20 minutes, so that the cobalt is fully precipitated, and the concentration of cobalt in the solution after cobalt precipitation is 327mg / L;
[0045] Process two (P2):
[0046] Filter with a plate and frame filter press to obtain filtrate 1 and filter cake 1, add water to slurry the filter cake 1, add water to adjust the slurry concentration to 10wt.%, water temperature 60 ° C, stirring speed during slurrying is 250rpm, stir for ...
Embodiment 3
[0059] like figure 1 As shown, the method for preparing magnesium hydroxide by reclaiming magnesium from the cobalt-nickel industry cobalt-containing magnesium solution provided by the present embodiment three includes the following steps:
[0060] Process one (P1):
[0061] Get cobalt-containing magnesium solution after extracting nickel, its cobalt content 90g / L, magnesium content 30g / L, at first adjust pH value to 8.2 with the sodium hydroxide of 6mol / L, temperature is controlled at 50 ℃, stirring speed 250rpm, and maintain Keep the pH value unchanged for 30 minutes, so that the cobalt is fully precipitated, and the concentration of cobalt in the solution after cobalt precipitation is 251mg / L;
[0062] Process two (P2):
[0063] Filter with a plate and frame filter press to obtain filtrate 1 and filter cake 1, add water to slurry the filter cake 1, add water to adjust the slurry concentration to 10wt.%, water temperature 50 ° C, stirring speed during slurrying is 200rpm, ...
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