Method of recovering rare earth by dump leaching of rare earth-containing acid hydrolysis residues
A technology for acid hydrolysis of slag and rare earth, applied in the direction of improving process efficiency, can solve problems such as unsuitable rare earth leaching
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Embodiment 1
[0032] Embodiment 1: a kind of heap leaching method that extracts the acid hydrolysis slag containing rare earth and reclaims rare earth, the steps are as follows:
[0033] (1) Pulverize the acid hydrolysis slag containing rare earth to obtain acid hydrolysis slag powder with a particle size of ≤1mm;
[0034] (2) Add 0.5% Gluconobacter breeding nutrient (consisting of 80% glucose and 20% yeast powder) and 0.5% calcium hydroxide to the acid-lysis slag powder, and pile up, The shape of the pile is truncated cone. When piled up, anti-seepage treatment is carried out on the ground, and leaching pads are laid on the anti-seepage layer;
[0035] (3) Rinse the accumulated acidolysis slag powder from top to bottom with water, until the pH value of the water used for rinsing is 4.5, and the fluctuation of the pH value at intervals of 3 hours is less than ±0.5, stop rinsing, and recycle the rinsing liquid;
[0036](4) Add the supernatant of the cultivated Gluconobacter culture solutio...
Embodiment 2
[0038] Embodiment 2: A kind of heap leaching method that extracts rare earth-containing acidolysis slag and reclaims rare earth, the steps are as follows:
[0039] (1) Pulverize the acid hydrolysis slag containing rare earth to obtain acid hydrolysis slag powder with a particle size of ≤1mm;
[0040] (2) Add 0.1% of the mass of the acid-lysis slag powder to the mass of the acid-lysis slag powder for the reproduction of Gluconobacter nutrient (composed of 70% glucose and 30% yeast powder) and 0.3% calcium hydroxide, and carry out Stacking, the shape of the stacking is frustum-shaped, when stacking, anti-seepage treatment is carried out on the ground, and leaching pads are laid on the anti-seepage layer;
[0041] (3) Rinse the accumulated acidolysis slag powder from top to bottom with water, until the pH value of the water used for rinsing is 3, and the fluctuation of the pH value at intervals of 3 hours is less than ±0.5, stop rinsing, and recycle the rinsing liquid;
[0042]...
Embodiment 3
[0044] Embodiment 3: A kind of heap leaching method that extracts the acid hydrolysis slag containing rare earth and reclaims rare earth, the steps are as follows:
[0045] (1) Pulverize the acid hydrolysis slag containing rare earth to obtain acid hydrolysis slag powder with a particle size of ≤1mm;
[0046] (2) Add 1% Gluconobacter breeding nutrient (composed of 90% glucose and 10% yeast powder) and 0.7% calcium hydroxide to the acid-lysis slag powder, and carry out Stacking, the shape of the stacking is frustum-shaped, when stacking, anti-seepage treatment is carried out on the ground, and leaching pads are laid on the anti-seepage layer;
[0047] (3) Rinse the accumulated acidolysis slag powder from top to bottom with water, until the pH value of the water used for rinsing is 6, and the fluctuation of the pH value at intervals of 3 hours is less than ±0.5, stop rinsing, and recycle the rinsing liquid;
[0048] (4) Add the supernatant of the cultivated Gluconobacter cultu...
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