CN115557647A - Method for reducing arsenic content in high-arsenic ion beneficiation wastewater - Google Patents
Method for reducing arsenic content in high-arsenic ion beneficiation wastewater Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 43
- 229910052785 arsenic Inorganic materials 0.000 title claims abstract description 30
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 title claims abstract description 30
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims abstract description 35
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims abstract description 32
- 230000015556 catabolic process Effects 0.000 claims abstract description 24
- 238000006731 degradation reaction Methods 0.000 claims abstract description 24
- 239000008394 flocculating agent Substances 0.000 claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 229910000029 sodium carbonate Inorganic materials 0.000 claims abstract description 16
- 235000017550 sodium carbonate Nutrition 0.000 claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 15
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 15
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 15
- 239000004571 lime Substances 0.000 claims abstract description 15
- 239000011707 mineral Substances 0.000 claims abstract description 15
- 235000010755 mineral Nutrition 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 13
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 11
- 238000004062 sedimentation Methods 0.000 claims abstract description 8
- 239000000701 coagulant Substances 0.000 claims abstract description 7
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 7
- 231100000719 pollutant Toxicity 0.000 claims abstract description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 6
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 6
- 230000000593 degrading effect Effects 0.000 claims abstract description 6
- 238000005189 flocculation Methods 0.000 claims abstract description 6
- 230000016615 flocculation Effects 0.000 claims abstract description 6
- 229910052725 zinc Inorganic materials 0.000 claims abstract description 6
- 239000011701 zinc Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 230000003472 neutralizing effect Effects 0.000 claims abstract description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 14
- 229920002401 polyacrylamide Polymers 0.000 claims description 5
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 229920000083 poly(allylamine) Polymers 0.000 claims 1
- 230000008569 process Effects 0.000 abstract description 12
- 230000000052 comparative effect Effects 0.000 description 9
- 238000002474 experimental method Methods 0.000 description 9
- 230000007935 neutral effect Effects 0.000 description 5
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- 238000002306 biochemical method Methods 0.000 description 2
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910001385 heavy metal Inorganic materials 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 239000012528 membrane Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- DJHGAFSJWGLOIV-UHFFFAOYSA-K Arsenate3- Chemical compound [O-][As]([O-])([O-])=O DJHGAFSJWGLOIV-UHFFFAOYSA-K 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229940000489 arsenate Drugs 0.000 description 1
- HAYXDMNJJFVXCI-UHFFFAOYSA-N arsenic(5+) Chemical compound [As+5] HAYXDMNJJFVXCI-UHFFFAOYSA-N 0.000 description 1
- AQLMHYSWFMLWBS-UHFFFAOYSA-N arsenite(1-) Chemical compound O[As](O)[O-] AQLMHYSWFMLWBS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052793 cadmium Inorganic materials 0.000 description 1
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 238000000975 co-precipitation Methods 0.000 description 1
- 238000005868 electrolysis reaction Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 239000000693 micelle Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5209—Regulation methods for flocculation or precipitation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
A method for reducing the arsenic content in high-arsenic ion beneficiation wastewater comprises the following steps: (1) adjusting pH: adding lime into the mineral processing wastewater to adjust the pH value to 10-13 to obtain solution A; (2) primary degradation: adding a reagent ferric trichloride and a flocculating agent into the solution A for flocculation and sedimentation separation to form a clarified solution B; degrading the content of As in the mineral processing wastewater to be below 0.3 mg/L; (3) secondary degradation: adding soda ash, ferric trichloride and a coagulant into the clarified liquid B for flocculation and sedimentation separation to form a new clarified liquid C; degrading the content of As in the mineral processing wastewater to be below 0.1 mg/L; (4) neutralizing the pH value: adding diluted hydrochloric acid into the clear liquid C to adjust pH value, and controlling pH value at 6-9. The beneficiation wastewater treated by the method can reach the water quality standard (special emission limit value) shown in the table 3 of the discharge standard of lead and zinc industrial pollutants (GB 25466-2010). And the treatment process is simple, the operation is convenient, and the treatment cost is low.
Description
Technical Field
The invention relates to the technical field of beneficiation wastewater treatment, in particular to a method for reducing arsenic content in high-arsenic ion beneficiation wastewater.
Background
The high arsenic ion beneficiation wastewater is arsenic-containing wastewater generated after a beneficiation process of a beneficiation plant. The main components in the wastewater comprise heavy metal elements such As arsenic, mercury, cadmium, chromium and the like, the arsenic content is high and reaches 0.6-2.5 mg/L, and As mainly exists in the form of ions; the content of other heavy metals is less. With increasing importance on environmental protection in countries and places, environmental laws and regulations are continuously perfected, requirements on wastewater discharge concentration of various industries are more and more strict, and special discharge limit values are executed on key pollutants generated by relevant production activities such as non-ferrous metal mining and selection, smelting and the like according to the discharge standard of pollutants for lead and zinc industry (GB 25466-2010). In Table 3 it is required to reduce the arsenic concentration from 0.3mg/L to 0.1mg/L. How to reach the emission standard, enterprises need to further discuss and study.
Generally, the arsenic reduction is carried out by ion exchange, membrane separation, electrolysis, adsorption, biochemical method, precipitation, etc. Among the methods, the ion exchange method, the membrane separation method, the adsorption method and the like have large investment and high treatment cost, are suitable for treating arsenic-containing wastewater with low concentration, and are difficult to engineer; scum generated by an electrolytic method is easy to cause secondary pollution; the fixed capital of the biochemical method is high; the precipitation method has simple process and low investment, and the difficulty of reducing the arsenic content in the mineral processing wastewater to below 0.1mg/L is large because the existing precipitation method for reducing the arsenic content in the mineral processing wastewater can only be reduced to about 0.3 mg/L. Therefore, it is practical to research a method which can reduce the arsenic to below 0.1mg/L, and has simple operation and low cost.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for reducing the arsenic content in high-arsenic ion beneficiation wastewater, which can reduce the arsenic concentration from 0.3mg/L to below 0.1mg/L to reach the water quality standard (special emission limit value) in Table 3 of discharge Standard of lead and zinc Industrial pollutants (GB 25466-2010), and has the advantages of simple process, convenient operation, lower treatment cost and good As removal effect.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for reducing the arsenic content in the high-arsenic ion beneficiation wastewater comprises the following steps of adding lime into the beneficiation wastewater to adjust the pH value, adding ferric chloride and a flocculating agent to carry out primary degradation, adding soda ash, ferric trichloride and PAM to carry out secondary degradation, and finally adding diluted hydrochloric acid into a clarified solution to adjust the pH value, wherein the method specifically comprises the following steps:
(1) Adjusting the pH: adding lime into the mineral processing wastewater to adjust the pH value to 10-13 to obtain solution A;
(2) Primary degradation: adding a reagent ferric trichloride and a flocculating agent into the solution A for flocculation and sedimentation separation to form a clarified solution B; degrading the content of As in the mineral processing wastewater to be below 0.3 mg/L;
(3) And (3) secondary degradation: adding soda ash, ferric trichloride and a coagulant into the clarified liquid B for flocculation, sedimentation and separation to form a new clarified liquid C; degrading the content of As in the mineral processing wastewater to be below 0.1 mg/L;
(4) Neutralizing pH value: and adding diluted hydrochloric acid into the clear liquid C to adjust the pH value, and controlling the pH value to be 6-9 so as to reach the water quality standard (special emission limit value) shown in the table 3 of discharge standards of industrial pollutants for lead and zinc (GB 25466-2010).
The reagent used in the first degradation in the step (2) is waste water with the addition of ferric trichloride according to the weight ratio: ferric chloride = 1250.
The flocculating agent used in the first degradation in the step (2) is polyacrylamide, and the added amount of the flocculating agent is wastewater according to the weight ratio: flocculant = 2000.
The addition amount of the reagent sodium carbonate used in the secondary degradation in the step (3) is wastewater according to the weight ratio: flocculant = 1000.
The adding amount of the reagent ferric trichloride used in the secondary degradation in the step (3) is wastewater according to the weight ratio: flocculant = 5000.
The flocculating agent used in the secondary degradation in the step (3) is polyacrylamide, and the added amount of the flocculating agent is wastewater according to the weight ratio: flocculant = 40000.
The reagent used in the neutralization in the step (4) is dilute hydrochloric acid, the concentration is 1-10%, and the pH value is controlled at 6-9.
The technical principle of the invention is as follows:
(1) As arsenate and arsenite can form stable complex with iron metal ions, and the iron metal complex is fine and not easy to settle, the iron metal complex forms floccules under the action of a flocculating agent to generate coprecipitation.
(2) Calcium ions and carbonate ions are utilized to form calcium carbonate precipitates, and calcium carbonate is weak electrolyte and is in micelle in wastewater, and generates electric neutralization with colloidal substances in the wastewater, so that fine suspended particles form large-particle flocculent precipitates under the action of a flocculating agent, and the sedimentation is assisted.
①4Fe 3+ +4OH - ＝Fe(OH) 3 ↓；
②2AsO 2 - +O 2 +4OH - ＝2AsO 4 3- +2H 2 O；
③3Ca 2+ +2AsO 4 3- ＝Ca 3 (AsO 4 3- ) 2 ↓；
④Fe 3+ +AsO 4 3 ＝FeAsO 4 ↓ ·
⑤Ca 2 +CO 3 2+ ＝CaCO 3 ↓。
The invention has the beneficial effects that:
(1) Adding ferric chloride and flocculant for primary degradation, adding sodium carbonate, ferric chloride and flocculant for secondary degradation, forming large granular flocculent precipitate under the action of ferric chloride, sodium carbonate and flocculant, and reducing the arsenic concentration to below 0.1mg/L.
(2) The traditional method is replaced by a more convenient and lower-cost technology, the process is simple, and the cost is lower.
Drawings
FIG. 1 is a process flow diagram of the method for reducing the arsenic content in the high-arsenic ion beneficiation wastewater.
Detailed Description
The technical solution of the present invention is further described in detail below with reference to process flow diagrams and examples, but the embodiments of the present invention are not limited to the scope shown in the examples.
Example 1
This example is an example of the method for reducing arsenic content in high-arsenic ion beneficiation wastewater according to the present invention, and wastewater generated after a beneficiation process of a certain beneficiation plant is selected, wherein the concentration of As in beneficiation wastewater is 0.717mg/L, and the pH is 9.75. The specific operation steps are as follows:
1. lime, ferric trichloride and a flocculating agent are respectively added to the mixture to reach the concentration of 10 percent.
2. Adding lime with the concentration of 10% into the beneficiation wastewater, and adjusting the pH to 10-13 to obtain solution A;
3. adding ferric trichloride into the solution A, adding a flocculating agent after 5 minutes, and standing for 15 minutes to form a clarified solution B;
4. adding sodium carbonate into the clear liquid B, adding ferric chloride after 5 minutes, adding a flocculating agent after 5 minutes, standing for 15 minutes, and performing sedimentation separation to form clear liquid C.
5. Adjusting the pH value of the clear liquid C to be neutral.
Example 2
In this embodiment, another example of the method for reducing arsenic content in high-arsenic ion beneficiation wastewater of the present invention is to select wastewater generated after a beneficiation process of a certain beneficiation plant, wherein the concentration of As in the beneficiation wastewater is 0.717mg/L, and the pH is 9.75. The specific operation steps are as follows:
1. lime, ferric trichloride and a flocculating agent are respectively prepared into 10 percent of concentration.
2. Adding lime with the concentration of 10% into the mineral processing wastewater, and adjusting the pH to 10-13 to obtain solution A;
3. adding ferric trichloride into the solution A, adding a flocculating agent after 5 minutes, and standing for 30 minutes to form a clarified solution B;
4. adding sodium carbonate into the clear liquid B, adding ferric chloride after 5 minutes, adding a coagulant after 5 minutes, standing for 15 minutes, and performing settling separation to form clear liquid C.
5. Adjusting the pH value of the clear liquid C to be neutral.
Example 3
This example is another example of the method for reducing arsenic content in high-arsenic ion beneficiation wastewater of the present invention, and wastewater generated after a beneficiation process of a certain beneficiation plant is selected, wherein the concentration of As in beneficiation wastewater is 0.717mg/L, and the pH is 9.75. The specific operation steps are as follows:
1. respectively preparing lime, ferric trichloride and a flocculating agent into 10% concentration;
2. adding lime with the concentration of 10% into the mineral processing wastewater, and adjusting the pH to 10-13 to obtain solution A;
3. adding ferric trichloride into the solution A, adding a flocculating agent after 5 minutes, and standing for 45 minutes to form a clarified solution B;
4. adding sodium carbonate into the clear liquid B, adding ferric chloride after 5 minutes, adding a coagulant after 5 minutes, standing for 15 minutes, and performing settling separation to form clear liquid C;
5. adjusting the pH value of the clear liquid C to be neutral.
Example 4
This example is another example of the method for reducing arsenic content in high-arsenic ion beneficiation wastewater of the present invention, and wastewater generated after a beneficiation process of a certain beneficiation plant is selected, wherein the concentration of As in beneficiation wastewater is 0.717mg/L, and the pH is 9.75. The specific operation steps are as follows:
1. respectively preparing lime, ferric trichloride and a flocculating agent into 10% concentration;
2. adding lime with the concentration of 10% into the mineral processing wastewater, and adjusting the pH to 10-13 to obtain solution A;
3. adding ferric trichloride into the solution A, adding a flocculating agent after 5 minutes, and standing for 30 minutes to form a clarified solution B;
4. adding sodium carbonate into the clear liquid B, adding ferric chloride after 5 minutes, adding a coagulant after 5 minutes, standing for 30 minutes, and performing settling separation to form clear liquid C.
5. Adjusting the pH value of the clear liquid C to be neutral.
Example 5
This example is another example of the method for reducing arsenic content in high-arsenic ion beneficiation wastewater of the present invention, and wastewater generated after a beneficiation process of a certain beneficiation plant is selected, wherein the concentration of As in beneficiation wastewater is 0.717mg/L, and the pH is 9.75. The specific operation steps are as follows:
1. respectively preparing lime, ferric trichloride and a flocculating agent into 10% concentration;
2. adding lime with the concentration of 10% into the mineral processing wastewater, and adjusting the pH to 10-13 to obtain solution A;
3. adding ferric trichloride into the solution A, adding a flocculating agent after 5 minutes, and standing for 30 minutes to form a clarified solution B;
4. adding sodium carbonate into the clear liquid B, adding ferric chloride after 5 minutes, adding a coagulant after 5 minutes, standing for 45 minutes, and performing settling separation to form clear liquid C.
5. Adjusting the pH value of the clear liquid C to be neutral.
The effect of the beneficiation wastewater treatment of examples 1 to 5 on the ratio is shown in table 1 below:
TABLE 1 comparison of the results of beneficiation wastewater treatment in examples 1 to 5
As can be seen from Table 1, the As concentration can be reduced to 0.1mg/L-0.136mg/L after the first degradation, the requirement of reaching the special emission limit value of 0.1mg/L cannot be guaranteed, but the As concentration is below 0.1mg/L after the second degradation. The method for performing primary degradation by using lime, ferric chloride and a flocculating agent and performing secondary degradation by using sodium carbonate, ferric trichloride and PAM can reduce the concentration of As to be less than 0.1mg/L, and the As reaches the water quality standard (special emission limit value) in Table 3 of discharge Standard of pollutants for lead and zinc industry (GB 25466-2010).
A comparative experiment was then carried out according to the invention using the procedure of example 4.
1. The concentration of As contained in the beneficiation wastewater of the comparative experiments (I) and (III) is 0.428mg/L, and the PH is 10.01; the concentration of As contained in the beneficiation wastewater of the comparative experiment (II) is 1.210mg/L, and the pH is 7.98.
2. The steps of comparative experiments (I) and (II) are the same as those of example 4, and the steps of comparative experiment (III) are the same as those of example 4 except that no soda ash is added in step 4.
The results of the comparative experiments are shown in table 2 below:
table 2 comparative experiment results table
As seen from Table 2, in the comparative experiment (III), the As concentration in the wastewater treated by adding no soda ash has no obvious change and is less than 0.1 mg/L; the comparative experiments (I) and (II) both reach below 0.1mg/L.
Claims (7)
1. A method for reducing the arsenic content in high-arsenic ion beneficiation wastewater is characterized by comprising the following steps:
(1) Adjusting the pH: adding lime into the mineral processing wastewater to adjust the pH value to 10-13 to obtain solution A;
(2) Primary degradation: adding a reagent ferric trichloride and a flocculating agent into the solution A for flocculation and sedimentation separation to form a clarified solution B; degrading the content of As in the mineral processing wastewater to be below 0.3 mg/L;
(3) And (3) secondary degradation: adding soda ash, ferric trichloride and a coagulant into the clarified liquid B for flocculation, sedimentation and separation to form a new clarified liquid C; degrading the content of As in the mineral processing wastewater to be below 0.1 mg/L;
(4) Neutralizing pH value: and adding diluted hydrochloric acid into the clear liquid C to adjust the pH value, and controlling the pH value to be 6-9 so as to reach the water quality standard (special emission limit value) shown in the table 3 of discharge standards of industrial pollutants for lead and zinc (GB 25466-2010).
2. The method for reducing the content of arsenic in high-arsenic ion beneficiation wastewater according to claim 1, wherein the reagent used in the first degradation in the step (2) is ferric chloride, and the added amount of the ferric chloride is the following amount by weight: ferric chloride = 1250.
3. The method for reducing the arsenic content in the high-arsenic ion beneficiation wastewater according to claim 1, wherein the flocculating agent used in the first degradation in the step (2) is polyacrylamide, and the flocculating agent is added into the wastewater in parts by weight: flocculant = 2000.
4. The method for reducing the arsenic content in the high-arsenic ion beneficiation wastewater according to claim 1, wherein the addition amount of the reagent soda ash used in the secondary degradation in the step (3) is the wastewater in parts by weight: flocculant = 1000.
5. The method for reducing the arsenic content in the high-arsenic ion beneficiation wastewater according to claim 1, wherein the reagent ferric trichloride used in the secondary degradation in the step (3) is added in an amount of, by weight, the wastewater: flocculant = 5000.
6. The method for reducing the arsenic content in the high-arsenic ion beneficiation wastewater according to claim 1, wherein the flocculant used in the secondary degradation in the step (3) is polyallylamine, and the flocculant is added into the wastewater according to the following weight ratio: flocculant = 40000.
7. The method for reducing the arsenic content in the high-arsenic ion beneficiation wastewater according to claim 1, wherein the reagent used for neutralization in the step (4) is dilute hydrochloric acid with the concentration of 1-10%, and the pH value is controlled to be 6-9.
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733617A (en) * | 2004-08-11 | 2006-02-15 | 巨化集团公司 | Processing method of waste water containing fluorine arsenic and lead |
| CN102642974A (en) * | 2012-05-07 | 2012-08-22 | 昆明理工大学 | Method for treating high-acid high-chlorine waste water |
| CN103030233A (en) * | 2011-09-30 | 2013-04-10 | 深圳市明灯科技有限公司 | Treatment method for high-concentration arsenic waste water |
| CN103695649A (en) * | 2013-12-13 | 2014-04-02 | 来宾华锡冶炼有限公司 | Method for processing high-concentration chlorine-containing wastewater |
| CN105753209A (en) * | 2016-03-03 | 2016-07-13 | 湖州欧美新材料有限公司 | Arsenic containing wastewater treatment method |
| CN106698887A (en) * | 2016-11-21 | 2017-05-24 | 兰州大学 | Preparation method and use method of compound inorganic flocculant poly-ferric aluminum sulfate |
| CN106830449A (en) * | 2017-01-12 | 2017-06-13 | 深圳市世清环保科技有限公司 | Effectively reduce the method and its processing system of chemical nickle-plating wastewater pollutant |
| CN111018194A (en) * | 2019-12-31 | 2020-04-17 | 南华大学 | Treatment and reuse method of nickel-molybdenum ore beneficiation wastewater |
| CN111039457A (en) * | 2019-12-24 | 2020-04-21 | 湖南中集环境投资有限公司 | Method for treating leachate wastewater of arsenic-containing waste residue landfill and abandoned mine |
| CN112299588A (en) * | 2019-07-25 | 2021-02-02 | 东泰高科装备科技有限公司 | Method for treating industrial wastewater with high content of organic matters and arsenic |
-
2022
- 2022-10-25 CN CN202211308534.1A patent/CN115557647A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1733617A (en) * | 2004-08-11 | 2006-02-15 | 巨化集团公司 | Processing method of waste water containing fluorine arsenic and lead |
| CN103030233A (en) * | 2011-09-30 | 2013-04-10 | 深圳市明灯科技有限公司 | Treatment method for high-concentration arsenic waste water |
| CN102642974A (en) * | 2012-05-07 | 2012-08-22 | 昆明理工大学 | Method for treating high-acid high-chlorine waste water |
| CN103695649A (en) * | 2013-12-13 | 2014-04-02 | 来宾华锡冶炼有限公司 | Method for processing high-concentration chlorine-containing wastewater |
| CN105753209A (en) * | 2016-03-03 | 2016-07-13 | 湖州欧美新材料有限公司 | Arsenic containing wastewater treatment method |
| CN106698887A (en) * | 2016-11-21 | 2017-05-24 | 兰州大学 | Preparation method and use method of compound inorganic flocculant poly-ferric aluminum sulfate |
| CN106830449A (en) * | 2017-01-12 | 2017-06-13 | 深圳市世清环保科技有限公司 | Effectively reduce the method and its processing system of chemical nickle-plating wastewater pollutant |
| CN112299588A (en) * | 2019-07-25 | 2021-02-02 | 东泰高科装备科技有限公司 | Method for treating industrial wastewater with high content of organic matters and arsenic |
| CN111039457A (en) * | 2019-12-24 | 2020-04-21 | 湖南中集环境投资有限公司 | Method for treating leachate wastewater of arsenic-containing waste residue landfill and abandoned mine |
| CN111018194A (en) * | 2019-12-31 | 2020-04-17 | 南华大学 | Treatment and reuse method of nickel-molybdenum ore beneficiation wastewater |
Non-Patent Citations (1)
| Title |
|---|
| 宋宝旭等: "国内选矿厂废水处理现状与研究进展", 《矿治》, vol. 21, no. 2, 30 June 2012 (2012-06-30), pages 97 - 103 * |
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