A filter bed filler for treating acid mine drainage, its preparation method and application

Abstract

The present invention provides a filter bed filler for treating acid mine drainage, and a preparation method and application thereof. The preparation method comprises: adding a slow-release alkaline substance to pure water and stirring evenly; adding ferrous salt and stirring thoroughly; adding hydrogen peroxide solution dropwise until no obvious bubbles escape from the mixed solution; adding phosphate and stirring evenly to adjust the pH value of the mixed solution to alkaline to generate a precipitate; filtering the generated precipitate, drying it, and grinding it to prepare it into a powder with a predetermined particle size, thereby obtaining a filter bed filler for treating acid mine drainage. The present invention proposes a filter bed filler for treating acid mine drainage and a preparation method thereof, so that the filter bed filler and filter bed technology can be used to treat acid mine drainage, that is, it can achieve long-term solidification of heavy metals in acid mine drainage, and will not cause problems such as soil compaction, salinization, and secondary pollution.

Description

Technical Field

[0001] The present invention relates to the technical field of water treatment, and particularly relates to a filter bed filler for treating acid mine drainage, a preparation method thereof, and an application thereof. Background Art

[0002] China is relatively rich in non-ferrous metal resources and has a relatively complete variety. With the rapid development of the country's industry and technology, the demand for non-ferrous metals has gradually increased, and the discharge of ore dressing wastewater and the storage of tailings have also increased continuously. When sulfur-containing ores are exposed to the air, after long-term contact with water, oxygen, and microorganisms, chemical oxidation and biological oxidation occur, and the surface water or groundwater in contact with the ores will form acid mine drainage containing a large amount of sulfates and heavy metal ions.

[0003] Discharging untreated acid mine drainage into nearby rivers and lakes will change the physical and chemical properties of the water body, damage the water body ecological cycle, and cause serious water body pollution. The wastewater will acidify the water body, and the deterioration of the water body will affect the health and survival of animals, plants, and microorganisms in the water, and ultimately seriously damage the structure and function of the ecosystem. The wastewater will also acidify the soil, pollute the farmland, and affect the normal growth and even death of crops. The impact caused by the heavy metal ions contained in the acid mine drainage is particularly serious because the heavy metals gradually accumulate in the water body and soil and will ultimately endanger human health with the spread. Therefore, it is urgent to improve the treatment method of acid mine drainage.

[0004] Currently, the treatment of acid mine drainage generally has the following methods:

[0005] 1) Using alkaline agents such as lime and sodium carbonate for neutralization, but in this method, the heavy metal precipitation is unstable, it is difficult to long-term solidify heavy metals, and it is easy to cause over-dosing, resulting in soil compaction or salinization;

[0006] 2) Sulfide precipitation method, that is, adding sulfiding agents such as sodium sulfide and ferrous sulfide to the mine drainage to generate heavy metal sulfide precipitation, but the addition of sulfiding agents will produce pollutants such as hydrogen sulfide, causing secondary pollution. Summary of the Invention

[0007] Based on this, the purpose of the present invention is to provide a filter bed filler for treating acid mine drainage, a preparation method thereof, and an application thereof, so as to solve at least one technical problem in the background art.

[0008] According to a preparation method of a filter bed filler for treating acid mine drainage in an embodiment of the present invention, the preparation method includes:

[0009] Adding a slow-release alkaline substance into pure water according to a predetermined solid-liquid ratio and stirring evenly to obtain a primary mixed solution;

[0010] Add ferrous salt to the primary mixed solution at the first addition concentration and stir well to obtain a secondary mixed solution;

[0011] Dropwise add hydrogen peroxide solution into the secondary mixed solution until no obvious bubbles escape from the mixed solution to obtain a tertiary mixed solution;

[0012] Add phosphate to the tertiary mixed solution at the second addition concentration and stir evenly to adjust the pH value of the mixed solution to alkaline to form a precipitate;

[0013] Filter, dry and grind the generated precipitate to prepare a powder with a predetermined particle size to obtain the filter bed filler for treating acidic mine drainage.

[0014] Preferably, the slow-release alkaline substance is one or a mixture of dolomite, black talc, apatite, chlorite and feldspar.

[0015] Preferably, the predetermined addition solid-liquid ratio is 20% - 70%.

[0016] Preferably, the first addition concentration is 0.05 mol / L - 0.5 mol / L.

[0017] Preferably, the second addition concentration is 0.05 mol / L - 0.2 mol / L.

[0018] Preferably, the molar ratio of the added hydrogen peroxide solution to the added ferrous is 0.5 - 1.5.

[0019] Preferably, the predetermined particle size is 20 mesh - 80 mesh.

[0020] On the other hand, the present invention also provides a filter bed filler for treating acidic mine drainage, which is prepared by using the preparation method of the filter bed filler for treating acidic mine drainage as described above.

[0021] On the other hand, the present invention also provides an application of the above-mentioned filter bed filler for treating acidic mine drainage in treating acidic mine drainage, and the filter bed filler is filled in a filter bed for treating acidic mine drainage.

[0022] Compared with the prior art: In the present invention, the product generated by the oxidation of ferrous salt is wrapped on the surface of the slow-release alkaline substance, so that partial passivation is formed on the surface of the alkaline substance, enabling the preparation of a filter bed filler with a large specific surface area, large inter-particle voids and strong adsorption capacity through the mechanical activation effect of drying and grinding. The acidic mine drainage is treated through the filter bed filler and the filter bed. The filter bed filler can passivate various heavy metals such as Ni, Mn, Cu, Pb and Zn in the sewage, achieving the purpose of long-term solidification and stabilization of heavy metals. At the same time, the filter bed filler can slowly release OH through partial passivation on the surface of the alkaline substance. -To adjust the pH value of the sewage, it can keep the pH value of the sewage within the range of 6 - 9 for a long time, avoiding the adverse effects such as waste of chemicals, over-alkalinity of water bodies, soil compaction or salinization caused by the addition of excessive alkaline chemicals. At the same time, the preparation process of this filler is simple and does not require sintering, avoiding secondary pollution generated during the preparation process of traditional fillers. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the detection graph of the inlet and outlet water pH values in Comparative Example 1 of the present invention;

[0024] Figure 2 It is the detection graph of the inlet and outlet water pH values in Example 1 of the present invention;

[0025] Figure 3 It is the detection graph of the inlet and outlet water Zn, Ni, Mn contents in Comparative Example 1 of the present invention;

[0026] Figure 4 It is the detection graph of the inlet and outlet water Zn, Ni, Mn contents in Example 1 of the present invention;

[0027] Figure 5 It is the detection graph of the inlet and outlet water Cu, Pb contents in Comparative Example 1 of the present invention;

[0028] Figure 6 It is the detection graph of the inlet and outlet water Cu, Pb contents in Example 1 of the present invention;

[0029] Figure 7 It is the detection graph of the inlet and outlet water pH values in Comparative Example 2 of the present invention;

[0030] Figure 8 It is the detection graph of the inlet and outlet water pH values in Example 2 of the present invention;

[0031] Figure 9 It is the detection graph of the inlet and outlet water Zn, Ni, Mn contents in Comparative Example 2 of the present invention;

[0032] Figure 10 It is the detection graph of the inlet and outlet water Zn, Ni, Mn contents in Example 2 of the present invention;

[0033] Figure 11 It is the detection graph of the inlet and outlet water Cu, Pb contents in Comparative Example 2 of the present invention;

[0034] Figure 12 It is the detection graph of the inlet and outlet water Cu, Pb contents in Example 2 of the present invention;

[0035] Figure 13 It is the detection graph of the inlet and outlet water pH values in Comparative Example 3 of the present invention;

[0036] Figure 14 It is the detection graph of the inlet and outlet water pH values in Example 3 of the present invention;

[0037] Figure 15 Detection chart of inlet and outlet water Zn, Ni, and Mn contents in Comparative Example 3 of the present invention;

[0038] Figure 16 Detection chart of inlet and outlet water Zn, Ni, and Mn contents in Example 3 of the present invention;

[0039] Figure 17 Detection chart of inlet and outlet water Cu and Pb contents in Comparative Example 3 of the present invention;

[0040] Figure 18 Detection chart of inlet and outlet water Cu and Pb contents in Example 3 of the present invention;

[0041] Figure 19 Detection chart of inlet and outlet water pH value in Comparative Example 4 of the present invention;

[0042] Figure 20 Detection chart of inlet and outlet water pH value in Example 4 of the present invention;

[0043] Figure 21 Detection chart of inlet and outlet water Zn, Ni, and Mn contents in Comparative Example 4 of the present invention;

[0044] Figure 22 Detection chart of inlet and outlet water Zn, Ni, and Mn contents in Example 4 of the present invention;

[0045] Figure 23 Detection chart of inlet and outlet water Cu and Pb contents in Comparative Example 4 of the present invention;

[0046] Figure 24 Detection chart of inlet and outlet water Cu and Pb contents in Example 4 of the present invention;

[0047] Figure 25 Detection chart of inlet and outlet water pH value in Comparative Example 5 of the present invention;

[0048] Figure 26 Detection chart of inlet and outlet water pH value in Example 5 of the present invention;

[0049] Figure 27 Detection chart of inlet and outlet water Zn, Ni, and Mn contents in Comparative Example 5 of the present invention;

[0050] Figure 28 Detection chart of inlet and outlet water Zn, Ni, and Mn contents in Example 5 of the present invention;

[0051] Figure 29 Detection chart of inlet and outlet water Cu and Pb contents in Comparative Example 5 of the present invention;

[0052] Figure 30It is the detection chart of Cu and Pb contents in the influent and effluent water in Embodiment 5 of the present invention;

[0053] Among them, in Figures 1 - 30 Among them, the black marks in the figure are the influent detection data, and the white marks are the effluent detection data.

[0054] The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings. Specific Embodiments

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0056] In addition, the term "and / or" used herein includes any and all combinations of one or more of the related listed items. In the specific embodiments and claims, a list of items connected by the term "one of" may mean any one of the listed items. For example, if items A and B are listed, then the phrase "one of A and B" means only A or only B. In another example, if items A, B, and C are listed, then the phrase "one of A, B, and C" means only A; only B; or only C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements. In the specific embodiments and claims, a list of items connected by the term "at least one of", "at least one kind of" or other similar terms may mean any combination of the listed items. For example, if items A and B are listed, then the phrase "at least one of A and B" or "at least one of A or B" means only A; only B; or A and B. In another example, if items A, B, and C are listed, then the phrase "at least one of A, B, and C" or "at least one of A, B, or C" means only A; or only B; only C; A and B (excluding C); A and C (excluding B); B and C (excluding A); or all of A, B, and C. Item A may include a single element or multiple elements. Item B may include a single element or multiple elements. Item C may include a single element or multiple elements.

[0057] Currently, alkaline agents are usually used for neutralization or sulfide precipitation methods to treat acidic mine drainage, but there will be problems such as difficulty in long-term solidification of heavy metals, easy over-dosing resulting in soil compaction or salinization, and secondary pollution. For this reason, the purpose of the present invention is to propose a filter bed filler for treating acidic mine drainage and its preparation method, so as to treat acidic mine drainage through this filter bed filler and filter bed technology, that is, it can achieve long-term solidification of heavy metals in acidic mine drainage and will not cause problems such as soil compaction, salinization, and secondary pollution.

[0058] In one aspect, an embodiment of the present invention provides a method for preparing a filter bed filler for treating acid mine drainage, the method comprising:

[0059] 1) adding the slow-release alkaline substance to pure water according to a predetermined solid-liquid ratio and stirring uniformly to obtain a primary mixed solution;

[0060] 2) adding ferrous salt to the primary mixed solution at a first addition concentration and stirring thoroughly to obtain a secondary mixed solution;

[0061] 3) adding hydrogen peroxide solution dropwise to the secondary mixed solution until no obvious bubbles escape from the mixed solution, thereby obtaining a tertiary mixed solution;

[0062] 4) adding phosphate to the three mixed solutions at a second addition concentration and stirring uniformly to adjust the pH value of the mixed solution to alkaline to form a precipitate;

[0063] 5) filtering the generated precipitate, drying it, and then grinding it to prepare a powder with a predetermined particle size, thereby obtaining a filter bed filler for treating acid mine drainage.

[0064] The slow-release alkaline substance is a mixture of one or more of dolomite, black talc, apatite, chlorite, and feldspar, and the particle size of the slow-release alkaline substance is no larger than 20 mesh, so that the slow-release alkaline substance can be better and more evenly dissolved in pure water to form a slurry. The predetermined solid-liquid ratio is 20% to 70%, for example, 25%, 50%, 60%, etc. The first addition concentration is 0.05mol / L to 0.5mol / L, that is, the concentration of the added ferrous salt is between 0.05mol / L and 0.5mol / L, for example, 0.15mol / L, 0.3mol / L, etc., and the ferrous salt is preferably ferrous sulfate heptahydrate. The second addition concentration is 0.05mol / L to 0.2mol / L, that is, the concentration of the added phosphate is between 0.05mol / L and 0.2mol / L, for example, 0.12mol / L, 0.15mol / L, etc., and the phosphate is preferably dipotassium hydrogen phosphate. The predetermined particle size is 20 mesh to 80 mesh, that is, the particle size of the filter bed filler for treating acid mine drainage is 20 mesh to 80 mesh, for example, 30 mesh, 50 mesh, etc. The molar ratio of the added hydrogen peroxide solution to the added ferrous salt is 0.5 to 1.5, that is, the total amount of the added hydrogen peroxide solution (H2O2) is 0.5 to 1.5. 2+ ) The molar ratio of the total amount is controlled at 0.5 to 1.5, for example, 1 or 1.2.

[0065] In the embodiments of the present invention, the product formed by the oxidation of ferrous salt is wrapped on the surface of the slow-release alkaline substance, so that partial passivation is formed on the surface of the alkaline mine, enabling the preparation of a filter bed filler with a large specific surface area, large voids between particles, and strong adsorption capacity through the mechanical activation of dry grinding.

[0066] In some preferred embodiments, it is possible to slowly drip the hydrogen peroxide solution, so that the filler can more fully absorb OH - , combined with the passivation effect on the surface of the filler, enabling the filter bed filler to slowly and continuously release OH through the partial passivation of the surface of the alkaline ore - to adjust the pH value of the sewage, making the adjustment of the pH value of the sewage more long-lasting. During specific implementation, the dripping speed of the hydrogen peroxide solution can be controlled within the threshold to control the slow dripping of the hydrogen peroxide solution, and the specific dripping speed can be adjusted according to actual needs.

[0067] The present invention will be described in detail below in combination with specific examples and comparative examples. In the following embodiments, the sewage used comes from the acidic mine drainage of a certain mining area in Guangfeng, Shangrao City, Jiangxi Province. The filter bed used is an organic glass column with a filter column diameter of 35 cm and an effective height of 85 cm. The cobblestone is used as the water collection layer, and the water is distributed by a rotating water distributor. The influent flow rate is 100 ml / min, and the hydraulic retention time is 1.2 h. The filler used in the examples is the filter bed filler prepared by the present invention, and the fillers used in the comparative examples are traditional filter bed fillers such as limestone, dolomite, volcanic rock, pyrite, and vermiculite. The examples and comparative examples use the same filter bed with different filter bed fillers for comparison, as follows:

[0068] Example 1

[0069] The preparation method of the filter bed filler for treating acidic mine drainage in Example 1 specifically includes: adding feldspar into pure water at a solid-liquid ratio of 30% to prepare a pulp, adding 0.05 mol / L ferrous sulfate heptahydrate and stirring, dripping the hydrogen peroxide solution until no obvious bubbles escape, with the molar ratio of hydrogen peroxide to ferrous being 0.5, then adding 0.05 mol / L dipotassium hydrogen phosphate and stirring evenly, adjusting the pH to be greater than 8; filtering, drying, and grinding the generated precipitate to prepare a powder with a particle size of 40 - 80 mesh, obtaining the filter bed filler for treating acidic mine drainage.

[0070] ​Figures 1 - 6 as shown

[0071] Example 2

[0072] The preparation method of the filter bed filler for treating acid mine drainage in Example 2 specifically includes: adding dolomite into pure water according to a solid-liquid ratio of 40% to prepare a pulp, adding 0.1 mol / L ferrous sulfate heptahydrate and stirring, dropping hydrogen peroxide solution until no obvious bubbles escape, with the molar ratio of hydrogen peroxide solution to ferrous being 0.8, then adding 0.1 mol / L dipotassium hydrogen phosphate and stirring evenly, adjusting the pH to be greater than 8; filtering, drying and grinding the generated precipitate to prepare a powder with a particle size of 40-80 mesh, obtaining the filter bed filler for treating acid mine drainage.

[0073] Set Comparative Example 2, and the filter bed filler used in Comparative Example 2 is untreated dolomite with the particle size controlled at 40-80 mesh. The filter bed fillers of Example 2 and Comparative Example 2 are respectively used in the filter bed to treat the same acid mine drainage. Among them, the pH value of the raw water of the acid mine drainage is 3.6-3.85, which is introduced into the filter bed, and it operates 6 cycles per day, with water distribution for 40 minutes in each cycle. After operating for 130 days, the corresponding detection indexes of Comparative Example 2 and Example 2 are as Figures 7 - 12 shown

[0074] Example 3

[0075] The preparation method of the filter bed filler for treating acid mine drainage in Example 3 specifically includes: adding apatite into pure water according to a solid-liquid ratio of 60% to prepare a pulp, adding 0.2 mol / L ferrous sulfate heptahydrate and stirring, dropping hydrogen peroxide solution until no obvious bubbles escape, with the molar ratio of hydrogen peroxide solution to ferrous being 1.2, then adding 0.15 mol / L dipotassium hydrogen phosphate and stirring evenly, adjusting the pH to be greater than 8; filtering, drying and grinding the generated precipitate to prepare a powder with a particle size of 40-80 mesh, obtaining the filter bed filler for treating acid mine drainage.

[0076] Set Comparative Example 3, and the filter bed filler used in Comparative Example 3 is untreated volcanic rock with the particle size controlled at 40-80 mesh. The filter bed fillers of Example 3 and Comparative Example 3 are respectively used in the filter bed to treat the same acid mine drainage. Among them, the pH value of the raw water of the acid mine drainage is 3.6-3.85, which is introduced into the filter bed, and it operates 6 cycles per day, with water distribution for 40 minutes in each cycle. After operating for 130 days, the corresponding detection indexes of Comparative Example 3 and Example 3 are as Figures 13 - 18 shown

[0077] Example 4

[0078] The preparation method of the filter bed filler for treating acid mine drainage in Example 4 specifically includes: adding chlorite into pure water according to a solid-liquid ratio of 50% to prepare a pulp, adding 0.1 mol / L of ferrous sulfate heptahydrate and stirring, dropping hydrogen peroxide solution until no obvious bubbles escape, with the molar ratio of hydrogen peroxide solution to ferrous being 1.5, then adding 0.2 mol / L of dipotassium hydrogen phosphate and stirring evenly, adjusting the pH to be greater than 8; filtering, drying and grinding the generated precipitate to prepare a powder with a particle size of 40 - 80 mesh, thus obtaining the filter bed filler for treating acid mine drainage.

[0079] Set Comparative Example 4, and the filter bed filler used in Comparative Example 4 is untreated pyrite, with the particle size controlled at 40 - 80 mesh. The filter bed fillers of Example 4 and Comparative Example 4 are respectively used in the filter bed to treat the same acid mine drainage. Among them, the pH value of the raw water of this acid mine drainage is 3.6 - 3.85, which is introduced into the filter bed, and it runs for 6 cycles every day, with water distribution for 40 minutes in each cycle. After running for 130 days, the corresponding detection indexes of Comparative Example 4 and Example 4 are as Figures 19 - 24 shown.

[0080] Example 5

[0081] The preparation method of the filter bed filler for treating acid mine drainage in Example 5 specifically includes: adding dolomite into pure water according to a solid-liquid ratio of 70% to prepare a pulp, adding 0.3 mol / L of ferrous sulfate heptahydrate and stirring, slowly dropping hydrogen peroxide solution until no obvious bubbles escape, with the molar ratio of hydrogen peroxide solution to ferrous being 1.5, then adding 0.2 mol / L of dipotassium hydrogen phosphate and stirring evenly, adjusting the pH to be greater than 8; filtering, drying and grinding the generated precipitate to prepare a powder with a particle size of 40 - 80 mesh, thus obtaining the filter bed filler for treating acid mine drainage.

[0082] Set Comparative Example 5, and the filter bed filler used in Comparative Example 5 is untreated vermiculite, with the particle size controlled at 40 - 80 mesh. The filter bed fillers of Example 5 and Comparative Example 5 are respectively used in the filter bed to treat the same acid mine drainage. Among them, the pH value of the raw water of this acid mine drainage is 3.6 - 3.85, which is introduced into the filter bed, and it runs for 6 cycles every day, with water distribution for 40 minutes in each cycle. After running for 130 days, the corresponding detection indexes of Comparative Example 5 and Example 5 are as Figures 25 - 30 shown.

[0083] In summary, from Figures 1 - 30It can be clearly seen that by preparing filter bed fillers with a large specific surface area, large voids between particles, and strong adsorption capacity, the acid mine drainage can be treated through the filter bed fillers and the filter bed. The filter bed fillers can passivate various heavy metals such as Ni, Mn, Cu, Pb, and Zn in the sewage, achieving the purpose of long-term solidification and stabilization of heavy metals. At the same time, the filter bed fillers can adjust the pH value of the sewage by slowly and continuously releasing OH-, enabling the pH value of the sewage to be maintained at 6-9 for a long time, avoiding the adverse effects such as waste of chemical agents and over-alkalinity of the water body caused by the addition of excessive alkaline agents. At the same time, the preparation process of the filler is simple and does not require sintering, which not only avoids secondary pollution generated during the preparation of traditional fillers, but also effectively utilizes the waste rocks and tailings generated by mining activities, reducing the land occupation for stacking and the generation of solid waste, greatly alleviating the space pressure of the tailing pond.

[0084] Another aspect of the embodiments of the present invention further provides a filter bed filler for treating acid mine drainage, which is prepared by using the preparation method of the filter bed filler for treating acid mine drainage described in any one of the above embodiments.

[0085] Another aspect of the embodiments of the present invention further provides an application of the above-mentioned filter bed filler for treating acid mine drainage in treating acid mine drainage, and the filter bed filler is filled in a filter bed for treating acid mine drainage.

[0086] The above embodiments only represent several implementation manners of the present invention, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. A preparation method of a filter bed filler for treating acid mine drainage, characterized in that, The preparation method comprises: Adding the slow-release alkaline substance to pure water according to a predetermined solid-liquid ratio and stirring evenly to obtain a primary mixed solution; adding ferrous salt to the primary mixed solution at a first addition concentration and stirring the mixture sufficiently to obtain a secondary mixed solution; adding hydrogen peroxide solution dropwise to the secondary mixed solution until no obvious bubbles escape from the mixed solution, thereby obtaining a tertiary mixed solution; adding phosphate to the three mixed solutions at a second addition concentration and stirring evenly to adjust the pH value of the mixed solution to alkaline to generate a precipitate; The generated precipitate is filtered, dried, and then ground to prepare a powder with a predetermined particle size, thereby obtaining the filter bed filler for treating acid mine drainage.

2. The preparation method of the filter bed filler for treating acid mine drainage according to claim 1, characterized in that, The slow-release alkaline substance is one or a mixture of dolomite, black talc, apatite, chlorite and feldspar.

3. The preparation method of the filter bed filler for treating acid mine drainage according to claim 1 or 2, characterized in that, The predetermined addition solid-liquid ratio is 20% to 70%.

4. The preparation method of the filter bed filler for treating acid mine drainage according to claim 1, characterized in that, The first addition concentration is 0.05 mol / L to 0.5 mol / L.

5. The preparation method of the filter bed filler for treating acid mine drainage according to claim 1, characterized in that, The second addition concentration is 0.05 mol / L to 0.2 mol / L.

6. The preparation method of the filter bed filler for treating acid mine drainage according to claim 1, characterized in that, The molar ratio of the dropwise added hydrogen peroxide solution to the added ferrous iron is 0.5 to 1.

5.

7. The preparation method of the filter bed filler for treating acid mine drainage according to claim 1, characterized in that, The predetermined particle size is 20 mesh to 80 mesh.

8. A filter bed filler for treating acid mine drainage, characterized in that, The filter bed filler for treating acid mine drainage is prepared by the preparation method of any one of claims 1 to 7.

9. Use of the filter bed filler for treating acid mine drainage according to claim 8 in treating acid mine drainage, wherein the filter bed filler is filled in a filter bed for treating acid mine drainage.

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