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A method for removing calcium ions in the extraction and separation process of rare earth sulfate

A separation process, a technology of rare earth sulfate, applied in the direction of improving process efficiency, etc., to achieve the effects of reducing content, reducing the number of box cleaning, and improving the total extraction yield

Active Publication Date: 2022-04-05
甘肃稀土新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a method for removing calcium ions in the extraction and separation process of rare earth sulfate, so as to solve the problem that it is difficult to effectively prevent and remove calcium sulfate crystallization in the prior art

Method used

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  • A method for removing calcium ions in the extraction and separation process of rare earth sulfate
  • A method for removing calcium ions in the extraction and separation process of rare earth sulfate
  • A method for removing calcium ions in the extraction and separation process of rare earth sulfate

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Embodiment 1

[0039] like figure 1 Be the technical process schematic diagram of the present invention, comprise the following steps:

[0040] Step 1: lead the aqueous phase of the high-calcium sulfate rare earth sulfate solution with a calcium content of 1.89 g / L at the highest concentration point of the extraction production line to the oil separation tank for oil separation. After the oil separation, the petroleum content of the high-calcium water phase is less than 30 ppm;

[0041] Step 2: Lead people 100m into the decalcification tank 3 Add 5000kg of calcium sulfate active seed crystals to the high calcium sulfate rare earth solution after oil separation, start stirring, and react for 60 minutes;

[0042] Step 3: Introduce the slurry in the decalcification tank into a thickener and age for 60 minutes, and analyze the calcium content in the isolated rare earth sulfate solution, and the calcium content is 1.23g / L.

[0043] Step 4: The slurry at the bottom of the thickener is introduced...

Embodiment 2

[0047] Influence of the amount of calcium sulfate active seed crystals on the calcium-lowering effect of lanthanum-cerium sulfate solution

[0048] Among them, the lanthanum cerium sulfate solution is produced on-site by the Gansu rare earth production line, the rare earth concentration is 8-10g / L, and the calcium ion concentration is 2-3g / L; the calcium sulfate seed is prepared by the reaction of concentrated sulfuric acid and calcium hydroxide slurry to ensure the pH of the reaction process The value is 6-7.

[0049] Take 500mL of lanthanum cerium sulfate solution and place it in a 1000mL beaker, weigh calcium sulfate seeds in different proportions and add them to the beaker, stir for 1h, let stand for 1h, analyze the supernatant calcium ion concentration (calcium oxide meter), see the experimental results figure 2 ,from figure 2 It can be seen that when calcium sulfate active seeds are added, regardless of the amount added, the concentration of calcium ions in the lantha...

Embodiment 3

[0051] Effect of Stirring Reaction Time on Calcium Removal Efficiency of Lanthanum-Cerium Sulfate Solution

[0052] Get 500mL of lanthanum cerium sulfate solution and place it in a 1000mL beaker, take by weighing 25g of calcium sulfate seed crystals by solid-to-liquid ratio 5%, add in the beaker, stir for different times, leave standstill for 1h, analyze the supernatant calcium ion concentration (calcium oxide meter), For specific data, see image 3 ,from image 3 It can be seen from the figure that when calcium sulfate seeds are added, the concentration of calcium ions in the lanthanum cerium sulfate solution decreases rapidly (within 1 h) to a certain extent, and remains almost unchanged with the prolongation of stirring time. At the beginning of crystallization, because the system has a large degree of supersaturation, it provides a strong driving force for crystallization, which makes the initial crystallization proceed explosively, as observed in the experiment. decreas...

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Abstract

The invention discloses a method for removing calcium ions in the extraction and separation process of rare earth sulfate, and belongs to the field of hydrometallurgy. The present invention uses calcium sulfate seed crystals to induce crystallization to realize the method for reducing calcium ions in the rare earth feed liquid. The high calcium sulfate rare earth solution in the extraction production line is subjected to oil separation treatment, and sulfuric acid is added according to the solid-to-liquid ratio (wt.%)=3-20%. Calcium active seed crystals, react for 0.5-2.0h, age for 0.5-2.0h, realize solid-liquid separation, discard the filter residue, and realize in vitro calcium reduction. After calcium reduction, the aqueous phase of rare earth sulfate solution is added to low-calcium wastewater to further dilute to calcium ion saturation The solubility is lower to effectively reduce the crystallization of the extraction production line.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and in particular relates to a method for removing calcium ions in the extraction and separation process of rare earth sulfate. Background technique [0002] Calcium sulfate crystallization hazards are serious in the hydrometallurgical process. For the Baotou mixed rare earth mine with the largest reserves in the world, the common separation process is the third-generation sulfuric acid method patented technology smelting independently developed by Beijing Nonferrous Metals Research Institute. Baotou rare earth After the concentrated ore is roasted with concentrated sulfuric acid, soaked in water, and neutralized, the calcium element is mainly precipitated into the waste residue in the form of calcium sulfate, and a small part of the calcium element is dissolved in the rare earth sulfate solution in the form of calcium sulfate, and is in a supersaturated state. In the transformation process of rare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/22C22B3/44C22B59/00
CPCC22B3/22C22B3/44C22B59/00Y02P10/20
Inventor 李虎平韩满璇王斌田斌胡广寿
Owner 甘肃稀土新材料股份有限公司
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