Method for recovering and recycling valuable elements from low-content rare earth solution and precipitation sludge
A technology of rare earth solution and valuable elements, which is applied in the fields of environmental protection and hydrometallurgy, and can solve problems such as pollution
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Embodiment 1
[0022] Example 1 Acid Leaching and Extraction Separation of Ion Adsorption Type Rare Earth Mine Pretreatment Slag
[0023] The acid-dissolved leachate (pH3.8) of the pretreated slag was taken from the production workshop of the Longnan Zudong mining area. The result of XRF measurement is: U34.7mg / L; Th 2.5mg / L, Y 1078mg / L; ICP measurement result: (La0.56, Ce 0.23, Pr 0.33, Nd 1.72, Sm 1.53, Eu0.01, Gd 2.51 , Tb 0.47, Dy 3.27, Ho 0.7, Er2.3, Tm 0.42) mg / L×50=1989.5 mg / L.
[0024] Use protonated N235 organic phase (N235: isooctyl alcohol: kerosene = 2:1:7) to extract the above acid leaching solution at a ratio of O / A = 1 / 1, raffinate aqueous phase XRF Y1056mg / L, Th 2.26mg / L , U0.9mg / L; it proves that the extractant has poor extraction ability to rare earth and thorium under this condition, and the concentration of rare earth and thorium in the aqueous phase has basically no change. However, the extraction ability of uranium is good, and the extraction rate reaches 90%, but it ...
Embodiment 2
[0027] Example 2 Take the pretreated slag from the production workshop of Zudong Mining Area in Longnan, and the slag after acid-solution leaching (pH3.8) continues to be leached with sulfuric acid until the equilibrium pH is 2.25. The result of the filtered filtrate measured by XRF is: U 29; Th 3.32, Y 473; extracted with N235 at a ratio of 1:1, the XRF measurement results of the raffinate aqueous phase are: Y476, Th 2.1, U0; it proves that increasing the acidity of the leaching solution is beneficial to the extraction of uranium by N235, but the extraction of thorium is still incomplete. The raffinate was extracted once with N1923 at a ratio of 1:1. The XRF measurement results of the raffinate were: Y 15.7 / 16.3; U0, Th0; it proved that N1923 could still extract uranium and thorium completely under higher acidity.
[0028] The organic phase extracted by N235 was back-extracted with 0.5M sodium carbonate solution at a ratio of 1:1. The XRF measurement results of the back-extra...
Embodiment 3
[0030] Lime neutralization of low-concentration rare earth solution to prepare sediment, followed by acid leaching and extraction, enrichment and separation
[0031] In the Longnan Zudong mining area, lime water and low-concentration rare earth solution were mixed and precipitated until the pH of the solution was about 8. The suspension is settled to obtain a lime neutralized precipitation residue of a low-concentration rare earth solution. After dissolving with sulfuric acid, use N1923 for single-stage extraction, and use ammonium chloride for 1-2 times of back extraction. The analysis results of the acid leach liquor and the raffinate aqueous phase as well as the strip liquor for the primary and secondary stripping of the extracted organic phase are listed in Table 1. The rare earth extraction rate of a single extraction reaches 99%, while aluminum is basically not extracted. The rare earth concentration of the stripping liquid has more than doubled, which is more than 200...
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