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Technological method of rare earth industrial wastewater treatment and cyclic utilization

A technology of industrial wastewater and process method, which is applied in the fields of metallurgical wastewater treatment, extraction water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of no economic value, incomplete treatment, large amount of secondary waste residue, etc. Achieving good economic value and realizing the effect of wastewater recycling

Inactive Publication Date: 2016-08-10
BAOTOU RES INST OF RARE EARTHS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of waste water that can be recycled to solve the problem of incomplete treatment of traditional rare earth industrial wastewater treatment methods, a large amount of secondary waste residue, and no economic value, resulting in waste of resources. A kind of rare earth industrial wastewater treatment and recycling The process method used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: Take 1L of waste water (rare earth industrial waste water) and put it into a 2L beaker, and the analysis results are shown in Table 1.

[0017] Element

CaO

MgO

CL-

SO42-

content

1.18

16.9

2.35

28.2

[0018] Add solid calcium chloride under stirring, continue to stir for 30 minutes, filter, and discard the filter residue. The components of the filtrate are shown in Table 2.

[0019] Element

CaO

MgO

CL-

SO42-

content

1.31

16.32

22.96

1.86

[0020] Add the solution to slaked lime, react for 30 minutes, filter, and send samples of the filtrate and residue respectively. The filtrate is shown in Table 3, and the drying of the filter residue is shown in Table 4.

[0021] Element

CaO

MgO

CL-

SO42-

content

16.3

0.06

22.96

1.24

[0022] Element

CaO

MgO

content

2.37

90.12

[0023] The fil...

Embodiment 2

[0025] Example 2: Take 1L of waste water (rare earth industrial waste water), the analysis results are shown in Table 6

[0026] Element

CaO

MgO

CL-

SO42-

content

0.87

21.23

21.45

48.24

[0027] Add unslaked lime to the waste water to remove SO42-, react for 30 minutes and filter, discard the filter residue, and the results of the filtrate are shown in Table 7

[0028] Element

CaO

MgO

CL-

SO42-

content

1.15

8.77

21.45

1.44

[0029] The waste water is added with slaked lime to remove magnesium, and the obtained filtrate and filter residue are sent as samples respectively. The filtrate results are shown in Table 8, and the filter residue is dried and sampled, and the results are shown in Table 9

[0030] Element

CaO

MgO

CL-

SO42-

content

10.96

0.06

20.17

0.41

[0031] Element

CaO

MgO

content

2.47

90.1...

Embodiment 3

[0034] Embodiment 3: get 1L waste water (rare earth industrial waste water), its analysis result is as shown in table 11,

[0035] Element

[0036] Add unslaked lime to the wastewater to remove SO42-, react for 30 minutes and filter, discard the filter residue, and the results of the filtrate are shown in Table 12.

[0037] Element

[0038] The waste water is added with slaked lime to remove magnesium, and the obtained filtrate and filter residue are sent as samples respectively. The results of the filtrate are shown in Table 13, and the results of the filter residue drying and sampling are shown in Table 14

[0039] Element

[0040] Element

[0041] With the filtrate shown in example 3 table 13, do roasting ore leaching according to solid-to-liquid ratio 1:8, water leaching slag sample analysis, the result is as shown in table 10

[0042] Element

[0043] By adopting the process of the invention, the magnesium-containing wast...

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PUM

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Abstract

The invention relates to a technological method of rare earth industrial wastewater treatment and cyclic utilization. The method includes using magnesium sulfate waste water generated by rare earth production technology as raw material, adding a precipitating agent to remove sulfate radical, and recycling magnesium from the used precipitating agent quicklime, slaked lime or calcium chloride to obtain magnesium hydroxide product with the purity more than 90% and calcium chloride solution. The magnesium hydroxide product can be used for performing saponification of extractant, and thecalcium chloride solution can be used for leaching rare earth roasted ore. The leached rare earth immersion liquid enters P507 full extraction transformation technology, and the obtained rare earth solution enters the next process of rare earth extraction separation. The generated waste water can be treated by the method of the present invention. The zero discharge of the waste water in full extraction transformation technology can be realized, the magnesium resource can be recycled, and the REO recovery rate is as same as the rate of new water-leach.

Description

Technical field: [0001] The invention relates to a process method for rare earth industrial wastewater treatment and recycling, and belongs to the technical fields of hydrometallurgy and industrial environmental protection. Background technique: [0002] Baiyan Obo rare earth concentrate 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. The decomposed concentrate is called roasted ore. The roasted ore is leached with water. Most of the rare earth enters the water phase in the form of sulfate, and a small amount of impurity ions such as calcium, magnesium, thorium, iron, and manganese are also dissolved in the form of sulfate. form into the solution, which is called the water immersion solution. In order to reduce the impact of impurity ions on subsequent processes, the water immersion solution is usually neutralized to a pH value of about 4.5 to...

Claims

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Application Information

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IPC IPC(8): C02F9/04C01F5/22C01F11/24C02F103/16
CPCC02F9/00C01F5/22C01F11/24C02F1/26C02F2103/16
Inventor 候少春赵永志马莹丁艳蓉张文娟李二斗谢军李赫
Owner BAOTOU RES INST OF RARE EARTHS
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