Method for removing calcium and magnesium in rare-earth industrial wastewater

A technology of industrial wastewater and rare earth, which is applied in metallurgical wastewater treatment, chemical instruments and methods, extraction water/sewage treatment, etc., can solve problems such as equipment blockage, achieve quality improvement, good separation effect, and solve serious pipe blockage effects

Inactive Publication Date: 2016-04-06
BAOTOU RES INST OF RARE EARTHS
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  • Description
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for removing and separating calcium and magnesium from rare earth industrial wastewater, so as to solve the problem of serious equipment blockage in the wastewater treatment process

Method used

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  • Method for removing calcium and magnesium in rare-earth industrial wastewater

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Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: Under the condition that the volume ratio of the organic phase to the liquid phase is 2:1, and the saponification rate is 30%, after extraction and standing for stratification, the concentration of calcium and magnesium in the raffinate is measured. The magnesium ion content in the original ammonium sulfate wastewater is 8.55g / L, the content in the raffinate is 3.49g / L, and the removal rate reaches 59.18%; the calcium ion content in the original ammonium sulfate wastewater is 0.48g / L, and the content in the raffinate 0.01g / L, the removal rate is 97.92%. As can be seen from the above examples, when the saponification rate is lower than 45%, the removal rate of magnesium ions in the original ammonium sulfate wastewater is low. The experimental results are shown in Table 2.

Embodiment 2

[0014] Example 2: Under the condition that the volume ratio of the organic phase to the liquid phase is 2:1, and the saponification rate is 45%, after the extraction is left to stand and layered, the concentration of calcium and magnesium in the raffinate is measured. The magnesium ion content in the original ammonium sulfate wastewater was 8.55g / L, and the content in the raffinate was 0.74g / L, with a removal rate of 91.35%; the calcium ion content in the original ammonium sulfate wastewater was 0.48g / L, and the content in the raffinate Less than 0.01g / L, the removal rate is greater than 97.92%. The experimental results are shown in Table 2.

Embodiment 3

[0015] Example 3: Under the condition that the volume ratio of the organic phase to the liquid phase is 2:1, and the saponification rate is 60%, after the extraction is left to stand for stratification, the concentration of calcium and magnesium in the raffinate is measured. The magnesium ion content in the original ammonium sulfate wastewater was 8.55g / L, and the content in the raffinate was 0.27g / L, with a removal rate of 96.84%; the calcium ion content in the original ammonium sulfate wastewater was 0.48g / L, and the content in the raffinate 97.92%. The experimental results are shown in Table 2.

[0016] .

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Abstract

The invention relates to a method for removing calcium and magnesium in rare-earth industrial wastewater, which is characterized by comprising the following steps: carrying out extraction under the conditions that the volume ratio of the organic phase to the liquid phase is 1-2 and the saponification degree is 45-60%, wherein ammonium sulfate wastewater generated by a rare-earth acid-process smelting technique is used as a treatment object, and 50 vol% P507+50 vol% sulfonated coal oil is used as an organic extractant; and after the extraction, standing to stratify. The treatment method is simple: after a plurality of stages of extraction tanks are connected to the wastewater outlet, wastewater at the outlet can directly enter the ammonia evaporation system; and after the extraction and standing for stratification, the removal rates of calcium and magnesium ions in ammonium ortho-sulfate wastewater can respectively reach 90% or above, thereby solving the problem of severe blockage in the ammonia evaporation system pipeline. The method can implement continuous production, and has the advantages of high treatment capacity, high reaction speed, favorable separating effect and recyclable extractant. Meanwhile, the method reduces the impurity ion content in the ammonium sulfate product, and enhances the quality of the product.

Description

technical field [0001] The invention relates to a method for removing calcium and magnesium from rare earth industrial wastewater, and belongs to the technical fields of hydrometallurgy and industrial environmental protection. Background technique [0002] The invention aims at removing calcium and magnesium from the ammonium sulfate wastewater produced in the rare earth smelting process. In the rare earth smelting process, there are two sources of ammonium sulfate wastewater: [0003] The first source is mixed carbon sedimentation wastewater. Baiyan Obo rare earth ore is a mixed ore of bastnaesite and monazite. At present, more than 90% of Baiyan Obo rare earth concentrate is decomposed by concentrated sulfuric acid intensified roasting process. After the roasting and water immersion processes are completed, a part of the water immersion liquid enters the mixed carbon precipitation process, and flows into the carbon precipitation tank together with the ammonium bicarbonat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26C02F103/16
CPCC02F1/26C02F2103/16C02F2305/04
Inventor 宋静马莹候少春包呈敏李娜丁艳蓉李二斗张赟馨张文娟秦玉芳王晶晶
Owner BAOTOU RES INST OF RARE EARTHS
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