CN112174282B - Double electric layer pre-oxidation composite flocculant and preparation method and application thereof - Google Patents

Abstract

The invention discloses a double electric layer preoxidation composite flocculant and a preparation method and application thereof. The composite flocculant has strong dispersing capacity and good solubility in water, can be dissolved in water to obtain substances with negative charges, can electrically neutralize suspended substances, and improves the flocculation effect on ore mortar through the pre-oxidation, bridging adsorption and space net capturing effects.

Description

Double electric layer pre-oxidation composite flocculant and preparation method and application thereof

Technical Field

The invention belongs to the technical field of tailing treatment, and particularly relates to a double electric layer pre-oxidation composite flocculant and a preparation method and application thereof.

Background

In the mining process, in addition to valuable ores, mine solid wastes such as tailings and the like are generated in large quantities. About 40 percent of the produced tailings are coarse tailings (with the grain size of more than 19 mu m), and the coarse tailings are easy to be consolidated with the existing cementing materials such as cement to meet the quality requirement of filling mining areas, so the coarse tailings are generally recycled. And the fine-grade tailings with the particle size of below 19 mu m can not meet the production requirements, and the traditional treatment method is to build a tailing pond for piling up the fine tailings. The beneficiation process requires the use of large amounts of water, and therefore the fine tailings are typically stored in a tailings pond in the form of a slurry mixed with water. The tailings pond is an artificial debris flow danger source with high potential energy, and once a dam break accident occurs, normal production operation of an enterprise is influenced, and more importantly, destructive damage is brought to life safety, economy and environment of surrounding and downstream residents; meanwhile, a large amount of toxic and harmful substances contained in the tailing wastewater can continuously react with some substances in the tailings in a physicochemical reaction mode in the tailing deposition process to form new pollutants, so that the tailing harm is increased. The nonferrous metal tailings contain radioactive elements, so that radioactive pollution to the ecological environment can be caused once leakage occurs if the nonferrous metal tailings cannot be well treated, serious people can be absorbed by plants even, and the body health of human beings is directly harmed through the enrichment effect of a food chain. Therefore, there is a need to develop an efficient process for treating fine tailings.

The particle size of ultrafine particles in the fine tailing mortar is too small to be effectively precipitated under the action of gravity, solid particles are uniformly suspended in a solution, the diameter of tailing particles is in direct proportion to the precipitation speed, and therefore the fine tailings are difficult to rapidly precipitate, and a large amount of fine-grade tailings exist in tailing wastewater, so that the rapid separation of water and sand in the tailing wastewater (mixture of tailings and production wastewater) becomes the biggest problem in the flotation tailing treatment of the nonferrous metal industry.

In the non-ferrous metal industry at present, enterprises generally adopt a hydrocyclone and a tailing thickener to physically separate tailing from waste water, and rarely adopt physical and chemical methods such as a flocculating agent, a coagulant aid and the like. The chemical method mainly has certain influence on the water environment, and needs to be matched with a water treatment system for use, so that the system is complex, the engineering facility investment is large, and in addition, the treatment effect of chemical agents such as flocculating agents is easy to be influenced by a tailing system to generate fluctuation.

Nevertheless, many experts and scholars in the prior art have made a series of researches according to the physicochemical characteristics of tailings, and developed various flocculants for water-sand separation, and a grafted high molecular polymer is prepared through organic-inorganic compounding, so that not only is the water-sand separation effectively completed, but also the heavy metal content, chemical Oxygen Demand (COD), suspended matter content and the like in wastewater are reduced through a series of physicochemical reactions. Representative of these are the France Edison (SNF) polyacrylamide flocculant, the Siemens building science and technology university blast furnace slag-based cementitious Material (ASCM) wastewater treatment catalyst, and the organic-inorganic composite flocculant for oil sands tailings at the northeast university.

The polyacrylamide flocculant of France Edison company is used for separating water sand by utilizing the characteristics of good stability, strong adsorption bridging capacity, capability of effectively adsorbing specific substances by a plurality of functional groups, good flocculation effect, wide application range and the like of water-soluble high-molecular polymer Polyacrylamide (PAM), but still has great promotion space in the aspect of treating a tailing pond in the mining industry.

Blast furnace slag-based cementing material (ASCM) of the Seisan architecture science and technology university utilizes blast furnace slag (GBFS) to synthesize alkali-activated granular blast furnace slag-based cementing material, and utilizes three steps of reactions of polymerization, ion exchange and impregnation to synthesize a catalyst for treating dye wastewater, so that Congo red dye can be effectively degraded. However, the ASCM material is only suitable for dye wastewater treatment, and has poor effect in water-sand separation of a tailing pond.

Organic-inorganic composite flocculant for separating oil sand of northeast university is used for preparing reduced graphene oxide/TiO by surface initiated polymerization method ₂ -P (AM-DAC) organic-inorganic composite flocculant, wherein P (AM-DAC) is cationic polyacrylamide copolymerized from acryloyloxyethyltrimethyl ammonium chloride monomer and acrylamide monomer. The composite flocculant polymer prepared by the method has positive charges on the chain, and neutralizes negatively charged suspended particles to perform electrostatic adsorption and electric neutralization, so that the flocculation effect is improved. Although the flocculation effect of the composite flocculant prepared by the method is better than that of a universal commercial flocculant, the composite flocculant is only applied to the aspect of oil sand separation in the petroleum industry, and the effect of the composite flocculant on water sand separation of other metal tailings is not good. Therefore, most of various flocculants in the prior art lack universality, are only used for processing a certain special mine, and have poor applicability to mines.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, the first purpose of the invention is to provide an electric double layer pre-oxidation composite flocculant which can effectively flocculate lead-zinc ore fine tailings.

The electric double layer preoxidation composite flocculant comprises guar gum grafted polyacrylamide and an inorganic flocculant.

Compared with the prior art, the guar gum grafted polyacrylamide is used as the main coagulant for flocculating the fine tailings of the lead-zinc ore, wherein the guar gum structural units have excellent dispersing capacity in cold water and hot water, the agglomeration phenomenon cannot be generated, a high-viscosity solution can be formed at low concentration, the flocculation effect can be effectively enhanced, and the fine tailings can be favorably settled; the polyacrylamide structural unit contains an amido group, and a hydrogen bond is easily formed, so that the polyacrylamide structural unit has good water solubility and high chemical activity, and is grafted on a guar gum main chain to obtain a branched chain with higher activity than single polyacrylamide. Therefore, the guar gum grafted polyacrylamide provided by the invention has a plurality of active centers, can effectively react with fine tailing particles, is easy to form a net structure, and can effectively enhance the flocculation effect by spatially catching the fine tailing particles and matching with an inorganic flocculant.

Specifically, in the flocculation process of the composite flocculant, guar gum grafted polyacrylamide is used as a main flocculant and can be adsorbed on the surfaces of more than two particles, bridging is generated across the electric double layers of the two particles, a space catching structure is formed by a polyacrylamide long chain structure and guar gum branched chains, and a plurality of particles are connected together, so that flocculation and sedimentation are generated. Meanwhile, the inorganic flocculant is used as a coagulant aid, partial organic matters in the tailing lead ore particles can be effectively removed through preoxidation, and the inorganic flocculant has good coagulation aid and turbidity removal effects.

The viscosity average molecular weight of the guar gum grafted polyacrylamide is 1000-1400 million.

The mass ratio of the guar gum grafted polyacrylamide to the inorganic flocculant is 1-2, 1-1.5, preferably 1.7.

The inorganic flocculant is mainly divided into a cationic inorganic polymeric flocculant, an anionic inorganic polymeric flocculant, a compound inorganic polymeric flocculant and a traditional inorganic flocculant, and the cationic inorganic polymeric flocculant can influence the electric neutralization process and further influence the flocculation effect because the surfaces of particles of the tailing mortar, particularly the lead-zinc ore fine tailing mortar, are rich in positive charges, so that the inorganic flocculant can be selected from inorganic flocculants other than the cationic inorganic polymeric flocculant, such as common anionic inorganic polymeric flocculant, the compound inorganic polymeric flocculant and the traditional inorganic flocculant (inorganic metal salt, such as aluminum sulfate).

The anionic inorganic polymeric flocculant may be selected from active silicic acid flocculant, but is not limited thereto. The anionic inorganic polymeric flocculant has certain help for the electric neutralization treatment of the fine tailings. The composite inorganic polymeric flocculant can adopt a polysilicate aluminum flocculant, a polysilicate iron aluminum flocculant, a polymeric aluminum iron flocculant and the like, has better flocculation effect than the traditional inorganic flocculant, but has overhigh cost and limited improvement on the final flocculation effect.

Aluminum sulfate is preferred in consideration of the fact that the cost of aluminum sulfate is lower in the case where the difference in flocculation effect among the anionic inorganic polymeric flocculant, the composite inorganic polymeric flocculant, and the conventional inorganic flocculant aluminum sulfate is small.

The second purpose of the invention is to provide a preparation method of a double electric layer pre-oxidation composite flocculant, which comprises the following steps:

(1) Carrying out polymerization reaction on hydroxymethyl guar gum and acrylamide to obtain guar gum grafted polyacrylamide;

(2) And mixing the guar gum grafted polyacrylamide with an inorganic flocculant to obtain the electric double layer preoxidation composite flocculant.

In the step (1), the polymerization reaction temperature is 60 to 80 ℃, preferably 70 ℃. The polymerization reaction time is 1 to 3 hours, preferably 2 hours.

The polymerization reaction is carried out under the action of an initiator, and the initiator can be selected from polymerization reaction initiators commonly used in the field, such as an organic peroxide initiator, an inorganic peroxide initiator, an azo initiator and the like, but is not limited thereto. The initiator is preferably an inorganic peroxide initiator, such as a persulfate initiator, and specifically, potassium persulfate, sodium persulfate, ammonium persulfate, and the like can be used, but not limited thereto.

The polymerization reaction is carried out in a protective atmosphere, for example, inert gases such as nitrogen, argon, helium and the like are introduced in the reaction process to form the protective atmosphere, so that the influence of side reaction on the product quality is avoided.

The mass ratio of the hydroxymethyl guar gum to the acrylamide is 1-2.

To avoid excessive polymerization of the polymerization product, a chain terminator may be added to terminate the polymerization after the desired degree of polymerization has been achieved. In the invention, after the polymerization reaction is carried out for 1-3 h, the terminator can be added to terminate the polymerization reaction, and the guar gum grafted polyacrylamide with the viscosity average molecular weight of 1000-1400 ten thousand is obtained. As the chain terminator, there may be used those commonly used in the art, for example, hydroquinone, nitrobenzene and p-benzoquinone.

After the polymerization reaction is finished, the guar grafted polyacrylamide is in a reaction mixture consisting of hydroxymethyl guar, acrylamide, guar grafted polyacrylamide, an initiator, a solvent and the like, and needs to be purified. The purification method can adopt the common purification means in the field, such as extraction, according to the solubility of each component in the reaction mixture, by way of example, the extraction process can firstly add acetone solution to the reaction mixture, then add a mixture of formamide and acetic acid to carry out extraction precipitation, and the obtained precipitate is guar-grafted polyacrylamide. Besides the above extraction method, other purification methods commonly used in the art can be used to purify the guar-grafted polyacrylamide, and are not limited to the exemplary method.

After the extraction and precipitation, the precipitate is dried and crushed, and the drying temperature is between 50 and 80 ℃, preferably 60 ℃. In order to avoid the damage of the guar gum grafted polyacrylamide structure, the drying temperature can not be too high. In order to fully expose the active chain segment in the guar gum grafted polyacrylamide and improve flocculation, the particle size of the crushed guar gum grafted polyacrylamide is not more than 120 mu m (120 meshes), and preferably, the particle size is not more than 109 mu m (140 meshes).

The method also comprises the following steps before the step (2): guar gum grafted polyacrylamide is mixed with sodium salt, and then alkaline activator is added. Sodium ions in the sodium salt enter a guar gum grafted polyacrylamide polymer net structure under the action of an alkaline activator. The sodium ion filling environment is favorable for the stability of the polymer structure, and the sodium ions in the polymer network structure have good replacement effect on copper ions, cobalt ions and the like, so the step is favorable for improving the adsorption of the flocculating agent on metal ions in the flocculation process. Wherein the sodium salt is selected from common water-soluble sodium salts, such as sodium silicate and sodium sulfate; the alkaline activator can be selected from common alkaline metal salt such as sodium carbonate and sodium bicarbonate.

The mass ratio of the guar gum grafted polyacrylamide to the sodium salt to the alkaline activator is 1.

And adding an alkaline activator, and stirring for 1-3 min, preferably 2min, so that sodium ions fully enter the inside of the guar gum grafted polyacrylamide. Drying for 5-7 h at 50-70 ℃ after stirring.

And after drying, adding the product into an ammonium salt solution, and performing ion exchange by using ammonium ions and partial sodium ions to ensure that the polymer net structure contains partial ammonium ions, and balancing the pH of the fine tail mortar. The ammonium salt is selected from common water soluble ammonium salt such as ammonium acetate and ammonium chloride.

The concentration of the ammonium salt solution is 1-2M, and 2M is preferred.

The third purpose of the invention is to provide the application of the electric double layer preoxidation composite flocculant. Specifically, the invention provides an application of the electric double layer preoxidation composite flocculant in settling ore mortar.

More specifically, the invention provides application of the electric double layer pre-oxidation composite flocculant in settling fine tailing mortar, wherein the fine tailings refer to fine-grained tailings with the grain size of below 19 microns generated in a mining process.

More specifically, the invention provides application of the electric double layer pre-oxidation composite flocculant in settling lead-zinc ore fine tail mortar.

The addition amount of the electric double layer preoxidation composite flocculant is 5-15 g/L.

The invention has the following beneficial effects:

(1) The composite flocculant has strong dispersing capacity and good solubility in water, can obtain substances with negative charges after being dissolved in water, can electrically neutralize suspended substances, and improves the flocculation effect on ore mortar through the pre-oxidation, bridging adsorption and space catching effects.

(2) The composite flocculant of the invention can play a role in binding through mechanical, physical and chemical actions, thereby leading suspended substances to aggregate and settle.

(3) The composite flocculant of the invention can effectively reduce the frictional resistance of fluid, and the resistance can be reduced by more than 50% by adding a trace amount of flocculant into water.

(4) The composite flocculant has a net structure and an excellent thickening effect.

Drawings

FIG. 1 is a photograph of a formulated pharmaceutical formulation, wherein a is the present flocculant and b is an Epson flocculant;

FIG. 2 is the absorbance of the supernatant at different settling times at a concentration of 5 g/L;

FIG. 3 is the absorbance of the supernatant at different settling times at a drug concentration of 7.5 g/L;

FIG. 4 is the absorbance of the supernatant at different settling times for a drug concentration of 10 g/L;

FIG. 5 is the absorbance of the supernatant at different settling times at a concentration of 15 g/L;

FIG. 6 is a photograph of the sedimentation after 30min at a concentration of 10g/L, wherein a is a photograph of the sedimentation with the addition of the flocculant and b is a photograph of the sedimentation with the addition of the Edison flocculant.

Detailed Description

The technical scheme of the invention is further illustrated by the following specific examples.

Example 1

The embodiment provides an electric double layer pre-oxidation composite flocculant, and a preparation method thereof comprises the following steps:

(1) A250 ml three-neck round bottom flask was taken and equipped with an electromagnetic stirrer. Heating to 70 + -1 deg.C, and maintaining constant temperature. In a three-neck round bottom flask, 11.34g of hydroxymethyl guar was dissolved in 100ml of deionized water to give a hydroxymethyl guar solution. Nitrogen was slowly passed through the reactor with constant stirring and bubbling for about 15min.

18.32g of acrylamide was dissolved in 20ml of deionized water to obtain an acrylamide solution.

Mixing a hydroxymethyl guar gum solution and an acrylamide solution, introducing nitrogen into the mixture for 30min, introducing 5ml of 0.1mol/L potassium persulfate solution for initiation, continuously introducing high-purity nitrogen for 1h, and carrying out a polymerization reaction at a stirring speed of 300 r/min; after 1h, 20mL of 0.5mol/L hydroquinone saturated solution is added to terminate the reaction.

(2) To the mixture after the end of the reaction, 400ml of an acetone solution was added, and then the precipitation was performed by extraction using a mixture of formamide and acetic acid solutions in a volume ratio of 1. The precipitate is the main flocculant guar gum grafted polyacrylamide, and the obtained precipitate is dried in a 60 ℃ oven for 6 hours and crushed by a 140-mesh screen.

(3) Mixing the product obtained in the step (2) with Na ₂ SiO ₃ ·9H ₂ O and water are mixed in a mass ratio of 1:0.11:0.30, then 10mmol/L sodium carbonate aqueous solution (further enriching sodium ions in the polymer network structure, and simultaneously facilitating the stability of the polymer structure) with the mass ratio of the product to sodium carbonate of 1:0.7 is added, and after fully stirring for 2min, the mixture is placed in an oven at 60 ℃ for drying for 6h.

(4) 160g of the product obtained in the step (3) is added into 400ml of 2M ammonium acetate aqueous solution, and ion exchange is carried out for 24h at room temperature. After ion exchange is finished (ammonium ions and partial sodium ions are exchanged, the polymer network structure contains partial ammonium ions, which is beneficial to balancing the pH value of the fine tail mortar), filtering, fully washing with deionized water and drying in nitrogen at 60 ℃ for 24 hours in sequence.

(5) And mechanically mixing the dried mixture with aluminum sulfate powder in a mass ratio of 1.7.

The main performance indexes of the electric double layer preoxidation composite flocculant obtained in the example are shown in the following table:

item	Performance index
		Appearance of the product	White powder
Solid content	99％
		Intrinsic viscosity (dL/g)	16.7～18.3
Degree of hydrolysis%	12.5～30
		Filtration ratio	≤1.5
Viscosity (mpa.s, 23. + -. 2 ℃ C.)	≥38.0
		Screen coefficient	≥20.0
Dissolution Rate (h)	≤1.5

And the viscosity average molecular weight of the guar gum grafted polyacrylamide is calculated to be 1000-1400 ten thousand according to the intrinsic viscosity.

The electric double layer preoxidation composite flocculant has the following main characteristics:

1. flocculation property: can lead suspended matters to play a role in flocculation through the effects of electric neutralization, bridge adsorption and the like.

2. Adhesion: can be used for adhesion through mechanical, physical and chemical actions.

3. Resistance reduction: the friction resistance of the fluid can be effectively reduced, and the resistance can be reduced by more than 50% by adding the micelle agent into the water.

4. Thickening property: has thickening effect under neutral and acidic conditions, and is easy to hydrolyze when the pH value is above 10. When the structure is in a semi-net structure, the thickening is more obvious.

The above main properties can be reflected by a flocculation effect test:

specifically, the flocculation ability of the electric double layer pre-oxidized composite flocculant (hereinafter referred to as the present flocculant) of this example on the fine tailing mortar was tested, and meanwhile, AN epson mine dedicated flocculant (AN 934SH, anionic polyacrylamide, with a relative molecular weight of 500 ten thousand, hereinafter referred to as AN epson flocculant) and polyacrylamide were used for comparison.

The test method adopted by the invention is as follows:

1) The flocculant, the epson flocculant or the polyacrylamide is dissolved in a small amount of water to be used as an experimental medicament, has good solubility in water, and forms a colorless transparent solution after being dissolved in water, as shown in figure 1.

2) Taking ore pulp containing fine-grained (the grain size is below 19 mu m) lead-zinc ore tailings on site, using a 1000ml measuring cylinder with millimeter scales vertically or a tool specially used for measuring cylinder samples for settlement tests, filling the taken ore pulp containing the fine-grained tailings into the measuring cylinder to full scale, adding a medicament, then uniformly stirring by using a stirrer (the concentration of the medicament in the mortar is 0.5g/L, 7.5g/L, 10g/L or 15g/L, and simultaneously serving as comparison, setting a group of natural settlement control groups without any medicament), taking out the stirrer, starting timing, and observing and recording the heights of clarification layers at different times.

3) And (4) taking water samples with the same height from the liquid level, and detecting absorbance.

4) After settling for a certain time, the weight of the solids in the measuring cylinder is detected, and the beginning concentration and the final concentration of the settling test, the beginning height and the final height of the settling test, and the weight and specific gravity of the settled solids in the wastewater are recorded.

The absorbance of the supernatant of the sand at different settling times is shown in FIGS. 2 to 5 and Table 1.

TABLE 1 Absorbance of supernatants at different sedimentation times

Test results show that the absorbance of water in the supernatant of the flocculant is smaller than that of an epson flocculant and polyacrylamide under different concentrations, which shows that the flocculant has stronger capturing capability on fine particles and has less content of residual fine-fraction tailings in water. In the experiment, the measuring cylinder of the flocculant basically has no wall hanging phenomenon, the transparency of the supernatant is high during and after precipitation, more fine particles can be seen during precipitation of the Edison flocculant, and the supernatant is gray after precipitation for 30min, as shown in figure 6.

After settling for 30min, the COD of the supernatant (effluent from the settling experiment) is shown in Table 2 below.

TABLE 2 COD of effluent from settling experiment

As can be seen from the table, the COD content of the effluent water is not increased by the flocculant, the Erson flocculant and the polyacrylamide, and is slightly reduced compared with the COD content of the effluent water by natural sedimentation.

After settling for 30min, the sludge settling volume is shown in table 3.

TABLE 3 sludge sedimentation volume

Table 3 shows that the sludge volume after the epson flocculant and polyacrylamide are settled is less than that of the flocculant, which indicates that the flocculant has more adsorbed particles and better settling effect.

And filtering tailings obtained by natural sedimentation and sedimentation by adding different flocculating agents by using a filter membrane of 0.45 mu m, putting the tailings into a weighed culture dish, weighing the weight of a filter cake and the weight of the culture dish, putting the filter cake and the culture dish into an oven, drying, weighing, and calculating the water content.

Tests show that the water content of the flocculant group settled is 31.51 percent, and the water content of the epson flocculant group settled is 31.75 percent.

The fine tailings obtained after the flocculant is settled have better dispersibility, and better using effect when being matched with a lead-zinc ore tailing sand filling body cementing material (patent application number: 202010016392.6).

The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.

Claims (10)

1. A preparation method of a double electric layer preoxidation composite flocculant is characterized by comprising the following steps: the method comprises the following steps:

(1) Carrying out polymerization reaction on hydroxymethyl guar gum and acrylamide to obtain guar gum grafted polyacrylamide;

(2) Mixing guar gum grafted polyacrylamide with an inorganic flocculant to obtain a double electric layer preoxidation composite flocculant;

the method also comprises the following steps before the step (2): mixing guar gum grafted polyacrylamide with sodium salt, and adding an alkaline activator; adding an alkaline active agent, stirring for 1-3 min, and drying at 50-70 ℃ for 5-7 h after stirring; after drying, adding the product into an ammonium salt solution;

the mass ratio of the guar gum grafted polyacrylamide to the inorganic flocculant is 1-2: 1 to 1.5;

the mass ratio of the guar gum grafted polyacrylamide to the sodium salt to the alkaline active agent is 1:0.1 to 0.2:0.5 to 1;

the inorganic flocculant comprises at least one of an anionic inorganic polymeric flocculant, a composite inorganic polymeric flocculant and an inorganic metal salt;

the electric double layer preoxidation composite flocculant is a flocculant applied to settling ore mortar.

2. The preparation method of the electric double layer pre-oxidation composite flocculant according to claim 1, characterized by comprising the following steps: in the step (1), the polymerization reaction temperature is 60-80 ℃.

3. The preparation method of the electric double layer preoxidation composite flocculant according to claim 2, characterized by comprising the following steps: the polymerization reaction time is 1-3 h.

4. The preparation method of the electric double layer preoxidation composite flocculant according to claim 1, characterized by comprising the following steps: the polymerization reaction is carried out under the action of an initiator.

5. The electric double layer preoxidation composite flocculant is characterized in that: the electric double layer pre-oxidized composite flocculent gel prepared by the preparation method according to any one of claims 1 to 4, comprising guar gum grafted polyacrylamide and an inorganic flocculant.

6. The double layer preoxidation composite flocculant of claim 5, wherein: the viscosity average molecular weight of the guar gum grafted polyacrylamide is 1000-1400 ten thousand.

7. The electric double layer pre-oxidized composite flocculant of claim 5, wherein: the mass ratio of the guar gum grafted polyacrylamide to the inorganic flocculant is (1-2): 1 to 1.5.

8. The double layer preoxidation composite flocculant of claim 5, wherein: the inorganic flocculant is one or more selected from anionic inorganic polymeric flocculant, composite inorganic polymeric flocculant and inorganic metal salt.

9. Use of an electric double layer pre-oxidised composite flocculant according to any one of claims 5 to 8 in the sedimentation of ore mortars.

10. Use according to claim 9, characterized in that: the addition amount of the electric double layer preoxidation composite flocculant in the ore mortar is 5-15 g/L.

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