Treatment method of wastewater in extraction process of beryllium oxide

Abstract

The application discloses a treatment method of wastewater in an extraction process of beryllium oxide, and adds precipitated wastewater obtained after production of beryllium hydroxide into raffinate obtained in the extraction process of beryllium oxide, and then performs neutralization and precipitation after adding an adjusting agent, so as to obtain wastewater residue and neutralized wastewater through filtration; the wastewater residue is modified and calcined at 800-1000 DEG C; calcined waste residue is obtained, and then the calcined waste residue is added into the same batch of raffinate, so as to obtain filtrate and waste residue through filtration; calcium hydroxide is added into the obtained neutralized wastewater, so as to obtain neutralized residue and treated wastewater. The method realizes low-cost treatment of the wastewater and recycling of resources, and greatly improves the recovery rate of beryllium.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for treating wastewater in the process of extracting beryllium oxide. Background Art

[0002] During the centrifugal extraction process for beryllium oxide production, the beryllium oxide and impurity contents in the beryllium sulfate leachate often vary, depending on the beryllium ore raw material. Compared to sulfuric acid precipitation, the centrifugal extraction process reduces beryllium losses in the slag from aluminum and iron removal, thereby improving the overall beryllium yield. However, the extraction process generates 2-3 times more wastewater than sulfuric acid precipitation. Therefore, wastewater treatment is a core step in the centrifugal extraction process and crucial to the normal and continuous operation of centrifugal extraction of beryllium oxide. The wastewater generated by the centrifugal extraction process includes raffinate, washing wastewater, regeneration wastewater, and sedimentation wastewater. Research has been conducted on the recovery and reuse of washing and regeneration wastewater, but no better treatment methods are available for the acidic raffinate and alkaline sedimentation wastewater. Summary of the Invention

[0003] In order to overcome the problems in the prior art, the present invention provides a method for treating wastewater in the process of extracting beryllium oxide by an extraction method. The raffinate and precipitated wastewater generated in the production process of extracting beryllium oxide by a centrifugal extraction process are neutralized with each other, thereby reducing treatment costs. The treated wastewater can be directly discharged or reused in compliance with standards.

[0004] In order to solve the above technical problems, the technical solution proposed by the present invention is:

[0005] The present invention provides a method for treating wastewater in a process of extracting beryllium oxide by an extraction method, comprising:

[0006] S1. The beryllium-containing ore raw material is sequentially batched, high-temperature smelted, and acidified for leaching to obtain a beryllium sulfate leaching solution. The beryllium sulfate leaching solution is pretreated and then extracted with an organic phase to obtain an acidic raffinate and a beryllium-loaded organic phase.

[0007] S2. The beryllium-loaded organic phase is washed and then stripped with alkali to obtain a beryllium-loaded strip solution. The beryllium-loaded strip solution is hydrolyzed to obtain a product, beryllium hydroxide, and alkaline precipitation wastewater.

[0008] The following steps are involved:

[0009] S3. The acidic raffinate obtained above is mixed with the alkaline precipitation wastewater, and a component regulating reagent is added to neutralize the impurity ions in the mixed wastewater, and then the wastewater residue and the neutralized wastewater are obtained by filtration.

[0010] S4. Alkali solution is added to the neutralized wastewater obtained in step 3 to obtain neutralized residue and treated wastewater.

[0011] The present invention targets the raffinate obtained in the process of extracting beryllium oxide by an extraction method and the alkaline precipitation wastewater obtained after producing beryllium hydroxide. First, according to the content of the main components in the wastewater, a component adjustment reagent is added to neutralize the two acidic and alkaline wastewaters, so that most of the ions in the wastewater form precipitation without causing filtration difficulties. The harmful ions in the wastewater are deeply removed, and wastewater residue and neutralized wastewater are obtained by filtration. Alkali solution, such as calcium hydroxide, is added to the neutralized wastewater to obtain neutralized residue and treated wastewater. The neutralized residue content is very low, and the treated wastewater can be directly discharged in compliance with the standards.

[0012] As an optional embodiment, the processing method provided by the present invention further includes:

[0013] S5. Modify and roast the wastewater slag in step S3 at high temperature to obtain roasting waste slag.

[0014] S6. Add the roasting waste residue obtained in step S5 to the acidic raffinate described in step 1, and obtain a filtrate and waste residue after filtering.

[0015] In the present invention, the beryllium-containing waste residue (wastewater residue) produced by precipitation is then subjected to roasting and modification. The modified waste residue can directly adsorb beryllium in the raffinate with an adsorption rate of more than 95%, achieving efficient beryllium recovery.

[0016] As an optional embodiment, in the treatment method provided by the present invention, in step 5, the modified calcination temperature is 800-1000°C; the heating time from room temperature to the modified calcination temperature during calcination is 90-150 minutes, and the constant temperature calcination time is 30-90 minutes.

[0017] As an optional embodiment, in the treatment method provided by the present invention, in step 6, the mass of the roasting waste residue added to each liter of acidic raffinate is 30-40 g.

[0018] As an optional embodiment, in the treatment method provided by the present invention, in step 6, the waste residue is dissolved with dilute sulfuric acid to obtain a beryllium sulfate solution.

[0019] As an optional embodiment, in the treatment method provided by the present invention, the components of the acidic raffinate include: Be 80-150 mg / L, Fe 100-120 mg / L, Al 500-800 mg / L, Mg 20-50 mg / L, Ca 100-200 mg / L, Si 30-50 mg / L, F 9-10 mg / L, H + 0.3-0.7g / L.

[0020] The components of the alkaline precipitation wastewater include: Na + 13-23g / L, OH -8.5-17g / L, Fe 5-10mg / L, Ca 20-40mg / L, Mg 1-5mg / L, Al 200-300 mg / L, Be 80-150mg / L.

[0021] As an optional embodiment, in the treatment method provided by the present invention, the COD content in the acidic raffinate and the alkaline precipitation wastewater is less than 100 mg / L.

[0022] In the present invention, the raffinate and the precipitated wastewater can be first subjected to flotation to remove oil so that the COD content therein is less than 100 mg / L, thereby avoiding affecting subsequent treatment.

[0023] As an optional embodiment, in the treatment method provided by the present invention, the composition adjustment reagent is selected from at least one of calcium hydroxide, calcium oxide or zeolite.

[0024] As an optional embodiment, in the treatment method provided by the present invention, the amount of the component adjustment reagent added is 0.05-2% of the mass of the mixed wastewater.

[0025] As an optional embodiment, in the treatment method provided by the present invention, in step S6, the treated wastewater is reused as washing wastewater in production or is discharged after being adsorbed again and meeting the discharge standards.

[0026] In the present invention, the beryllium content of the filtrate obtained after filtration is less than 0.1 mg / L and can be directly discharged. The waste residue after beryllium absorption is used to dissolve the beryllium with dilute sulfuric acid, and the obtained beryllium sulfate solution can be directly returned to the production system, or the waste residue after beryllium absorption (beryllium content is 2.3-3.5%, which is 6.4-9.75% when converted into beryllium oxide) can be returned to the batching system as a raw material.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention is directed to extracting the raffinate and precipitated wastewater generated in the beryllium oxide production process using a centrifugal extraction process. The different acidity and alkalinity of the raffinate and alkaline precipitated wastewater are utilized to neutralize each other. A regulating reagent is simultaneously added to precipitate most of the ions in the wastewater, deeply removing harmful ions in the wastewater. Wastewater residue and neutralized wastewater are filtered to obtain the wastewater residue. The beryllium-containing wastewater residue generated by the precipitation is then roasted, and the roasted product can be directly used to adsorb beryllium in the raffinate. Alkali liquor is added to the neutralized wastewater for further treatment, and the treated wastewater can be directly discharged or reused in compliance with standards. The present invention simultaneously treats the raffinate and precipitated wastewater generated in the beryllium oxide production process using a centrifugal extraction process, eliminating the need for separate treatment, achieving low-cost treatment and resource recycling, and most importantly, improving the beryllium recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 The figure is a process flow chart of the treatment method of the present invention. DETAILED DESCRIPTION

[0031] To facilitate understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the specification and preferred embodiments, but the protection scope of the present invention is not limited to the following specific embodiments.

[0032] Unless otherwise defined, all technical terms used hereinafter have the same meanings as those generally understood by those skilled in the art. The technical terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0033] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0034] Example 1

[0035] The treatment method of wastewater in the process of extracting beryllium oxide by extraction method, the process flow is as follows Figure 1 As shown, the following steps are included:

[0036] The raffinate composition is as follows: Si 35.6 mg / L, F 9.42 mg / L, Fe 111.63 mg / L, Ca 148.3 mg / L, Al635.18 mg / L, Be 113.29 mg / L, Mg 43.83 mg / L, pH 0.45, COD content <100 mg / L.

[0037] Sedimentation wastewater composition: Fe 7.37mg / L, Ca 32.23mg / L, Al 252.08mg / L, Be 98.26mg / L, Mg3.56mg / L, OH - 11.38g / L, Na 22.35g / L, COD content <100mg / L.

[0038] (1) Take 1000 ml of the raffinate, adjust the pH to 5-6 with the precipitated wastewater, add 1 g of zeolite powder, and then continue to adjust the pH to 7.0 with the precipitated wastewater. Stir for 2-4 hours and measure the pH to 7.5. Filter to obtain wastewater residue (wastewater residue dry weight 7.5 g) and primary neutralization solution (neutralized wastewater).

[0039] (2) 5 g of wastewater slag was modified and calcined at 1000°C for 30 min, with a heating time of 100 min. The calcined slag weighed 3.2 g. The Be content of the calcined slag was 2.31%. 1.2 g of this slag was added to 30 ml of the raffinate from the same batch, stirred for 2 hours, and filtered. The filtrate was sampled and tested, and the results showed Si 19.49 mg / L, F 12.02 mg / L, Be 5.71 mg / L, Fe 35.41 mg / L, Ca 6.67 mg / L, Al 199.11 mg / L, and Mg 25.39 mg / L. The beryllium adsorption rate was 95%. After adsorption, the waste slag was dissolved in dilute sulfuric acid to obtain a beryllium sulfate solution. The treated wastewater was reused or discharged after re-adsorption to meet the discharge standards.

[0040] (3) The primary neutralization solution was sampled and analyzed, and the results showed Si 11.04 mg / L, F 8.32 mg / L, Fe 48.74 mg / L, Ca 5.16 mg / L, Al 258.93 mg / L, Be 15.02 mg / L, and Mg 25.9 mg / L. 0.5 g of calcium hydroxide was added to the primary neutralization solution to adjust the pH to approximately 8.5. After stirring for 2 hours, the solution was filtered to obtain the neutralization residue and treated wastewater. The dry residue weighed 0.9 g. The secondary neutralization solution was sampled and analyzed, and the results showed Si < 0.5 mg / L, F 6.5 mg / L, Be < 0.5 mg / L, Fe 3.57 mg / L, Ca 2.87 mg / L, Al 13.08 mg / L, and Mg < 22.44 mg / L. The secondary treated wastewater can be reused.

[0041] Example 2

[0042] The treatment method of wastewater in the process of extracting beryllium oxide by extraction method, the process flow is as follows Figure 1 As shown, the following steps are included:

[0043] The raffinate composition is as follows: Si 35.6 mg / L, F 9.42 mg / L, Fe 111.63 mg / L, Ca 148.3 mg / L, Al635.18 mg / L, Be 113.29 mg / L, Mg 43.83 mg / L, pH 0.45, COD content <100 mg / L.

[0044] Sedimentation wastewater composition: Fe 7.37mg / L, Ca 32.23mg / L, Al 252.08mg / L, Be 98.26mg / L, Mg3.56mg / L, OH - 11.38g / L, Na22.35g / L, COD content <100mg / L.

[0045] (1) Take 1000 ml of the raffinate, adjust the pH value to 5-6 with the precipitated wastewater, add 1 g of calcium hydroxide, and continue to adjust the pH value to 7.0 with the precipitated wastewater. Stir for 2-4 hours and measure the pH value to 7.6. Filter to obtain wastewater residue (wastewater residue dry weight 7.5 g) and primary neutralization solution (neutralized wastewater).

[0046] (2) 5 g of wastewater slag was modified and calcined at 800°C for 1 hour, with a heating time of 120 min. The slag weighed 3.12 g. The Be content of the slag was 2.25%. 1.0 g of this slag was added to 30 ml of the raffinate from the same batch, stirred for 2 hours, and filtered. The filtrate was sampled and tested, and the results showed Si 1.39 mg / L, F 9.96 mg / L, Be 0.05 mg / L, Fe 0.25 mg / L, Ca 360.21 mg / L, Al 128.22 mg / L, and Mg 9.77 mg / L. The beryllium adsorption rate was 99.96%. After adsorption, the waste slag was dissolved in dilute sulfuric acid to obtain a beryllium sulfate solution. The treated wastewater was reused or discharged after re-adsorption to meet the discharge standards.

[0047] (3) The pH value of the primary neutralization solution was adjusted to about 8.5 by adding 0.6g of calcium hydroxide. After stirring for 2 hours, the solution was filtered to obtain a dry residue weighing 1.0g. The secondary neutralization solution was sampled and analyzed. The results showed that Si < 0.5mg / L, F 3.6mg / L, Be < 0.05mg / L, Fe 2.32mg / L, Ca 3.82mg / L, Al 7.16mg / L, and Mg 23.35mg / L. The wastewater after secondary treatment can be reused.

[0048] Example 3

[0049] The treatment method of wastewater in the process of extracting beryllium oxide by extraction method, the process flow is as follows Figure 1 As shown, the following steps are included:

[0050] The raffinate composition is as follows: Si 35.6 mg / L, F 9.42 mg / L, Fe 111.63 mg / L, Ca 148.3 mg / L, Al635.18 mg / L, Be 113.29 mg / L, Mg 43.83 mg / L, pH 0.45, COD content <100 mg / L.

[0051] Sedimentation wastewater composition: Fe 7.37mg / L, Ca 32.23mg / L, Al 252.08mg / L, Be 98.26mg / L, Mg3.56mg / L, OH - 11.38g / L, Na22.35g / L, COD content <100mg / L.

[0052] (1) Take 1000 ml of the raffinate, adjust the pH value to 5-6 with the precipitated wastewater, add 0.8 g of calcium hydroxide, and continue to adjust the pH value to 6.5 with the precipitated wastewater. Stir for 2-4 hours and measure the pH value to 7. Filter to obtain wastewater residue (wastewater residue dry weight 7.5 g) and primary neutralization solution (neutralized wastewater).

[0053] (2) 5 g of wastewater slag was modified and calcined at 900°C for 90 hours, with a heating time of 150 minutes. The slag weighed 3.54 g. The Be content of the slag was 2.05%. 1.1 g of this slag was added to 30 ml of the raffinate from the same batch, stirred for 2 hours, and filtered. The filtrate was sampled and tested, and the results showed Si 1.22 mg / L, F 6.96 mg / L, Be 0.01 mg / L, Fe 0.24 mg / L, Ca 280.33 mg / L, Al 148.26 mg / L, and Mg 8.67 mg / L. The beryllium adsorption rate was 99.97%. After adsorption, the waste slag was dissolved in dilute sulfuric acid to obtain a beryllium sulfate solution. The treated wastewater was reused or discharged after re-adsorption to meet the discharge standards.

[0054] (3) The pH value of the primary neutralization solution was adjusted to about 8.5 by adding 0.8g of calcium hydroxide. After stirring for 2 hours, the solution was filtered to obtain a dry residue weighing 1.2g. The secondary neutralization solution was sampled and analyzed. The results showed that Si < 0.5mg / L, F 4.2mg / L, Be < 0.05mg / L, Fe 2.87mg / L, Ca 4.01mg / L, Al 10.23mg / L, and Mg 25.45mg / L. The wastewater after secondary treatment can be reused.

[0055] Comparative Example 1

[0056] The wastewater treatment method comprises the following steps:

[0057] The raffinate composition is as follows: Si 35.6 mg / L, F 9.42 mg / L, Fe 111.63 mg / L, Ca 148.3 mg / L, Al635.18 mg / L, Be 113.29 mg / L, Mg 43.83 mg / L, pH 0.45, COD content <100 mg / L.

[0058] Sedimentation wastewater composition: Fe 7.37mg / L, Ca 32.23mg / L, Al 252.08mg / L, Be 98.26mg / L, Mg3.56mg / L, OH - 11.38g / L, Na 22.35g / L, COD content <100mg / L.

[0059] (1) Take 500 ml of the raffinate, adjust the pH value to 7.0 with the precipitated wastewater, continue stirring for 2-4 hours, and measure the pH value to 7.6. Filter to obtain wastewater residue (wastewater residue dry weight 1.87 g) and primary neutralization solution (neutralized wastewater).

[0060] (2) 1.2 g of wastewater slag was added to 30 ml of the same batch of raffinate, stirred for 2 h, and filtered. The filtrate was analyzed and found to contain: Si234.5 mg / L, F25.76 mg / L, Be646.72 mg / L, Fe357 mg / L, Ca530.56 mg / L, Al2270 mg / L, and Mg71.61 mg / L. This indicates that the uncalcined wastewater slag does not have adsorption capacity and can be dissolved under acidic conditions.

[0061] (3) The primary neutralization solution was sampled and analyzed, and the results were Si 8.34 mg / L, F 7.27 mg / L, Fe 31.91 mg / L, Ca 3.27 mg / L, Al 159.46 mg / L, Be 8.36 mg / L, and Mg 23.8 mg / L. 0.5 g of calcium hydroxide was added to the primary neutralization solution to adjust the pH to approximately 8.5. After stirring for 2 hours, the solution was filtered to obtain the neutralization residue and treated wastewater. The dry residue weighed 0.9 g. The treated wastewater was sampled and analyzed, and the results were Si 0.91 mg / L, F 3.95 mg / L, Be <0.08 mg / L, Fe 0.63 mg / L, Ca 16.3 mg / L, Al 17.44 mg / L, and Mg 29.01 mg / L. The secondary treated wastewater can be reused.

[0062] Comparative Example 2

[0063] The wastewater treatment method comprises the following steps:

[0064] The raffinate composition is as follows: Si 35.6 mg / L, F 9.42 mg / L, Fe 111.63 mg / L, Ca 148.3 mg / L, Al635.18 mg / L, Be 113.29 mg / L, Mg 43.83 mg / L, pH 0.45, COD content <100 mg / L.

[0065] Sedimentation wastewater composition: Fe 7.37mg / L, Ca 32.23mg / L, Al 252.08mg / L, Be 98.26mg / L, Mg3.56mg / L, OH - 11.38g / L, Na 22.35g / L, COD content <100mg / L.

[0066] (1) Take 1000 ml of the raffinate, adjust the pH value to 7.0 with the precipitated wastewater, continue stirring for 2-4 hours, and measure the pH value to 7.5. Filter to obtain wastewater residue (wastewater residue dry weight 5.33 g) and primary neutralization solution (neutralized wastewater).

[0067] (2) 2 g of wastewater slag was modified and calcined at 800-1000°C for 1 hour. The slag weighed 1.27 g. The Be content of the slag was 2.02%. 1.2 g of this slag was added to 30 ml of the raffinate from the same batch, stirred for 2 hours, and then filtered. The filtrate was sampled and tested. The results showed Si 4.28 mg / L, F 6.24 mg / L, Be 12.9 mg / L, Fe 32.13 mg / L, Ca 3.91 mg / L, Al 160.69 mg / L, and Mg 24.7 mg / L. This indicates that the slag can adsorb beryllium, but the adsorption rate is low, at 88.6%.

[0068] (3) Add 1.2g of calcium hydroxide to the primary neutralization solution to adjust the pH to about 8.5. Stir for 2 hours and filter to obtain the neutralized residue and treated wastewater. The dry residue weighs 1.87g. The test results of the treated wastewater sample are: Si 0.71mg / L, F 2.92mg / L, Be <0.05mg / L, Fe 0.62mg / L, Ca 1.43mg / L, Al 2.66mg / L, Mg 23.01mg / L. The secondary treated wastewater can be reused.

[0069] Comparative Example 3

[0070] The wastewater treatment method comprises the following steps:

[0071] The raffinate composition is as follows: Si 35.6 mg / L, F 9.42 mg / L, Fe 111.63 mg / L, Ca 148.3 mg / L, Al635.18 mg / L, Be 113.29 mg / L, Mg 43.83 mg / L, pH 0.45, COD content <100 mg / L.

[0072] Sedimentation wastewater composition: Fe 7.37mg / L, Ca 32.23mg / L, Al 252.08mg / L, Be 98.26mg / L, Mg3.56mg / L, OH - 11.38g / L, Na 22.35g / L, COD content <100mg / L.

[0073] (1) Take 1000 ml of the raffinate, adjust the pH to 5-6 with the precipitated wastewater, add 1 g of zeolite, and continue to adjust the pH to 6.5 with the precipitated wastewater. Stir for 2-4 hours and measure the pH to 7. Filter to obtain wastewater residue (wastewater residue dry weight 6.8 g) and primary neutralization solution (neutralized wastewater).

[0074] (2) 1.2 g of wastewater slag was added to 30 ml of the same batch of raffinate, stirred for 2 h, and filtered. The filtrate was assayed and the results were: Si 250.1 mg / L, F 24.26 mg / L, Be 626.77 mg / L, Fe 359 mg / L, Ca 580.34 mg / L, Al 2298 mg / L, and Mg 70.61 mg / L. This indicates that the uncalcined wastewater slag does not have adsorption function and can be dissolved under acidic conditions.

[0075] (3) Add 0.8g of calcium hydroxide to the neutralization solution to adjust the pH to about 8.5. Stir for 2 hours and filter to obtain the neutralized residue and treated wastewater. The dry residue weighs 1.92g. The test results of the treated wastewater sample are: Si 0.71mg / L, F 2.92mg / L, Be <0.05mg / L, Fe 0.62mg / L, Ca 1.43mg / L, Al 2.66mg / L, Mg 23.01mg / L. The wastewater after secondary treatment can be reused.

[0076] In the present invention, the raffinate and precipitate wastewater are mixed, a composition regulator is added, and the resulting wastewater and wastewater residue are filtered. After treatment, the impurity content in the wastewater is significantly reduced, allowing direct reuse of the wastewater. After modification and calcination, the wastewater residue can directly adsorb beryllium from the raffinate, with an adsorption rate of ≥95%. This significantly improves beryllium recovery. Compared to the examples, in Comparative Example 1, where no composition regulator was added and the wastewater residue was calcined, the resulting primary neutralized solution contained a higher impurity content. After the secondary neutralized solution was treated with calcium hydroxide, the impurity content in the treated wastewater was higher than in Comparative Example 3. Without calcination, the wastewater residue, when added to the same batch of raffinate, failed to adsorb beryllium from the raffinate, indicating that the uncalcined and modified wastewater residue lacks adsorption capacity and can be re-dissolved under acidic conditions. In Comparative Example 2, where no composition regulator was added, the resulting wastewater residue, while still possessing some adsorption capacity after calcination, had a relatively low adsorption rate of 88.6%. In Comparative Example 3, the wastewater slag was not calcined and could not adsorb beryllium in the raffinate, indicating that the uncalcined wastewater slag did not have the adsorption function and the slag could be dissolved under acidic conditions.

[0077] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the scope of protection of the present invention.

Claims

1. The method for treating wastewater during the extraction of beryllium oxide by extraction method includes: S1. The beryllium-containing ore raw material is subjected to batching, high-temperature smelting, and acid leaching in sequence to obtain a beryllium sulfate leachate. The beryllium sulfate leachate is pretreated and then extracted with an organic phase to obtain an acidic raffinate and a beryllium-loaded organic phase; S2, washing the beryllium-loaded organic phase and then stripping it with alkali to obtain a beryllium-loaded strip solution, and hydrolyzing the beryllium-loaded strip solution to obtain a product, beryllium hydroxide, and alkaline precipitation wastewater; It is characterized in that it includes the following steps: S3, mixing the acidic raffinate obtained above with the alkaline precipitation wastewater, adding a composition regulating reagent to neutralize the impurity ions in the mixed wastewater, and then filtering to obtain a wastewater residue and neutralized wastewater; the composition regulating reagent is selected from at least one of calcium hydroxide, calcium oxide, or zeolite; S4, adding alkali solution to the neutralized wastewater obtained in step 3 to obtain neutralized residue and treated wastewater; S5, modifying and roasting the wastewater residue in step S3 at high temperature to obtain roasting waste residue; S6. Add the roasting waste residue obtained in step S5 to the acidic raffinate described in step 1, and obtain a filtrate and waste residue after filtering.

2. The method for treating waste water in the process of extracting beryllium oxide by extraction method according to claim 1, wherein In step 5, the modified calcination temperature is 800-1000° C.; the heating time from room temperature to the modified calcination temperature during calcination is 90-150 minutes, and the constant temperature calcination time is 30-90 minutes.

3. The method for treating waste water in the process of extracting beryllium oxide by extraction method according to claim 1, characterized in that: In step 6, the mass of the roasting waste residue added to each liter of the acidic raffinate is 30-40 g.

4. The method for treating wastewater in the process of extracting beryllium oxide by extraction method according to claim 1, characterized in that: In step 6, the waste residue is dissolved with dilute sulfuric acid to obtain a beryllium sulfate solution.

5. The method for treating wastewater in the process of extracting beryllium oxide by the extraction method according to any one of claims 1 to 4, characterized in that: The acidic raffinate contains: Be 80-150 mg / L, Fe 100-120 mg / L, Al 500-800 mg / L, Mg 20-50 mg / L, Ca 100-200 mg / L, Si 30-50 mg / L, F 9-10 mg / L, H + 0.3-0.7g / L; The components of the alkaline precipitation wastewater include: Na + 13-23g / L, OH - 8.5-17g / L, Fe 5-10mg / L, Ca 20-40mg / L, Mg 1-5mg / L, Al 200-300 mg / L, Be 80-150mg / L.

6. The method for treating wastewater in the process of extracting beryllium oxide by the extraction method according to any one of claims 1 to 4, characterized in that: The COD content in the acidic raffinate and the alkaline precipitation wastewater is less than 100 mg / L.

7. The method for treating wastewater in the process of extracting beryllium oxide by the extraction method according to any one of claims 1 to 4, characterized in that: The amount of the component adjustment reagent added is 0.05-2% of the mass of the mixed wastewater.

8. The method for treating wastewater in the process of extracting beryllium oxide by extraction method according to claim 1, characterized in that: In step S6, the treated wastewater is reused as washing wastewater in production or is discharged after being adsorbed again and meeting the discharge standards.

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