阅读说明：本技术 一种尾矿水处理与回用方法 (Tailing water treatment and recycling method ) 是由 魏大为 谢加文 胡新红 黄春海 肖宏 于 2021-09-15 设计创作，主要内容包括：本发明公开了一种尾矿水处理与回用方法,具体包括以下步骤：步骤1：生活用水试验研究,利用生活水进行钼铋钨萤石浮选闭路试验,将矿石研磨,然后通过磁选分离矿石内部的磁精矿,将去除磁精矿的矿粉依次加入反应剂反应7分钟,然后进行硫粗选,将粗选得到的硫化物进行硫精选,同时剩余物在进行一次硫扫选,硫扫选得到的含硫矿送入硫精选工序中,硫精选得到钼铋混合粗精矿,将硫扫选剩余的矿产进行钨粗选,并且将含钨的矿石进行钨精选,并且剩余矿石进行钨扫选。本发明与聚合硫酸铁方案相比,石灰方案不仅水处理药剂成本低,而且通过调整选矿药剂制度可基本消除尾矿水循环回用的不利影响。(The invention discloses a method for treating and recycling tailing water, which specifically comprises the following steps: step 1: the domestic water test research comprises the steps of carrying out a molybdenum bismuth tungsten fluorite flotation closed circuit test by utilizing live water, grinding ores, separating magnetic concentrates in the ores through magnetic separation, sequentially adding reactants into mineral powder without the magnetic concentrates for reaction for 7 minutes, then carrying out sulfur roughing, carrying out sulfur concentration on sulfides obtained through roughing, carrying out primary sulfur scavenging on residues, sending sulfur-containing ores obtained through sulfur scavenging into a sulfur concentration process, carrying out sulfur concentration to obtain molybdenum bismuth mixed rough concentrates, carrying out tungsten roughing on the residual minerals obtained through sulfur scavenging, carrying out tungsten concentration on the tungsten-containing ores, and carrying out tungsten scavenging on the residual ores. Compared with the scheme of polymeric ferric sulfate, the lime scheme has the advantages that the cost of the water treatment agent is low, and the adverse effect of recycling the tailing water can be basically eliminated by adjusting the system of the beneficiation agent.)

1. A method for treating and recycling tailing water is characterized in that: the method specifically comprises the following steps:

step 1: domestic water test research, performing a molybdenum-bismuth-tungsten fluorite flotation closed-circuit test by using live water, grinding ores, separating magnetic concentrates in the ores by magnetic separation, sequentially adding reactants into mineral powder without the magnetic concentrates for reaction for 7 minutes, then performing sulfur roughing, performing sulfur concentration on sulfides obtained by roughing, performing primary sulfur scavenging on the remainder, feeding sulfur-containing ores obtained by the sulfur scavenging into a sulfur concentration process, performing the sulfur concentration to obtain molybdenum-bismuth mixed rough concentrates, performing tungsten roughing on the residual minerals obtained by the sulfur scavenging, performing tungsten concentration on the tungsten-containing ores, performing tungsten scavenging on the residual ores, feeding the scavenged tungsten-containing ores into a tungsten concentration step, repeating the tungsten concentration operation for five times, performing reaction on water glass and aluminum sulfate to obtain tungsten concentrates, performing fluorite roughing on the tungsten-free ores, and taking the fluorite-free ores after the roughing as tailings, selecting fluorite obtained by rough concentration, reacting mixed alkali with water glass in the first three-time selection, reacting acidified water glass and hydrochloric acid in the second four-time selection, repeatedly selecting the fluorite after selection for seven times, finally obtaining fluorite concentrate, performing twice scavenging on the residual ore, sending the scavenged fluorite-containing ore into selection operation for seven times, selecting the remaining fluorite-free tailings which are selected tailings, wherein the obtained tailings are not easy to settle, and the supernatant liquid is still very turbid and has more solid suspended matters after standing for 24 hours;

step 2: the tailings water treatment test research comprises the steps of selecting conventional water treatment agents of calcium chloride, alum and lime to respectively perform a tailings water sedimentation test, destroying the colloid state of upper-layer liquid of fluorite tailings, so that the upper-layer clear liquid is obtained through sedimentation, the fluorite tailings are easier to settle by the lime, and the fluorite tailings water is treated by the lime, so that the obtained supernatant is clearer and nearly colorless, and therefore, the fluorite tailings are treated by the lime;

and step 3: performing recycling test research on tailing water, namely performing flocculation sedimentation on the tailing water by adding lime and GS-2 into the tailing water obtained in the step 1, performing size mixing by adopting sulfuric acid, and standing to obtain clear tailing water; then returning the treated tailing water to a backwater collecting barrel in time, and simultaneously carrying out ore treatment processing work in the step 1 by using a water source in the recovering barrel to replace domestic water in the step 1, and ensuring continuous recycling of the water source through the collecting barrel;

and 4, step 4: and (2) treating the tailing water by using polymeric ferric sulfate, treating the tailings obtained in the step (1) by using a medicament combination of PAM, a flocculating agent SS and polymeric ferric sulfate, wherein the medicament dosage is as follows: PAM65g/t, a flocculating agent SS65g/t and polymeric ferric sulfate 1200g/t, wherein the medicament system is adopted in a tailing sedimentation test, when PAM65g/t, a flocculating agent SS65g/t and polymeric ferric sulfate 1200g/t are adopted, the tailing sedimentation speed is high, the sedimentation effect is good, clear tailing water can be obtained after standing for 1 hour, and the obtained tailing water is used in the ore treatment work in the step 1.

2. The method for treating and recycling tailing water according to claim 1, characterized in that: the number of times of tungsten scavenging in the step 1 is three.

3. The method for treating and recycling tailing water according to claim 1, characterized in that: and (3) carrying out magnetic separation by using a magnetic roller in the step 1.

4. The method for treating and recycling tailing water according to claim 1, characterized in that: in the step 1, the grinding fineness of the ore is 200 meshes.

5. The method for treating and recycling tailing water according to claim 1, characterized in that: the medicaments used in the step 1 test are all commonly used medicaments.

6. The method for treating and recycling tailing water according to claim 1, characterized in that: the amount of the reclaimed water in the step 3 accounts for 72-78% of the total water consumption of the test.

7. The method for treating and recycling tailing water according to claim 1, characterized in that: and 3, a liquid level alarm module is arranged on the return water collecting barrel to prevent the liquid level from being lower than a normal value.

8. The method for treating and recycling tailing water according to claim 1, characterized in that: and water used in the operations of ore grinding, magnetic separation and flotation in the step 2, the step 3 and the step 4 is treated tailing water.

9. The method for treating and recycling tailing water according to claim 1, characterized in that: the beneficiation processes of the step 1, the step 3 and the step 4 are the same.

Technical Field

The invention relates to the technical field of tailing water treatment, in particular to a tailing water treatment and recycling method.

Background

The drainage of the beneficiation process is generally conveyed to a tailing pond together with tailing slurry, and is collectively called tailing water; beneficiation wastewater treatment is also referred to as tailing water treatment.

The existing ore treatment generally uses domestic water for saving water resources, but the tailing water generated after the use is difficult to reuse, namely the tailing water is difficult to reuse in the ore treatment, or a large amount of time is required for the treatment during the utilization, and the treated tailing water is difficult to reach the production quality of the domestic water.

Disclosure of Invention

The invention aims to provide a method for treating and recycling tailing water, which aims to solve the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: a method for treating and recycling tailing water comprises the following steps of 1: domestic water test research, performing a molybdenum-bismuth-tungsten fluorite flotation closed-circuit test by using live water, grinding ores, separating magnetic concentrates in the ores by magnetic separation, sequentially adding reactants into mineral powder without the magnetic concentrates for reaction for 7 minutes, then performing sulfur roughing, performing sulfur concentration on sulfides obtained by roughing, performing primary sulfur scavenging on the remainder, feeding sulfur-containing ores obtained by the sulfur scavenging into a sulfur concentration process, performing the sulfur concentration to obtain molybdenum-bismuth mixed rough concentrates, performing tungsten roughing on the residual minerals obtained by the sulfur scavenging, performing tungsten concentration on the tungsten-containing ores, performing tungsten scavenging on the residual ores, feeding the scavenged tungsten-containing ores into a tungsten concentration step, repeating the tungsten concentration operation for five times, performing reaction on water glass and aluminum sulfate to obtain tungsten concentrates, performing fluorite roughing on the tungsten-free ores, and taking the fluorite-free ores after the roughing as tailings, selecting fluorite obtained by rough concentration, reacting mixed alkali with water glass in the first three-time selection, reacting acidified water glass and hydrochloric acid in the second four-time selection, repeatedly selecting the fluorite after selection for seven times, finally obtaining fluorite concentrate, performing twice scavenging on the residual ore, sending the scavenged fluorite-containing ore into selection operation for seven times, selecting the remaining fluorite-free tailings which are selected tailings, wherein the obtained tailings are not easy to settle, and the supernatant liquid is still very turbid and has more solid suspended matters after standing for 24 hours;

step 2: the tailings water treatment test research comprises the steps of selecting conventional water treatment agents of calcium chloride, alum and lime to respectively perform a tailings water sedimentation test, destroying the colloid state of upper-layer liquid of fluorite tailings, so that the upper-layer clear liquid is obtained through sedimentation, the fluorite tailings are easier to settle by the lime, and the fluorite tailings water is treated by the lime, so that the obtained supernatant is clearer and nearly colorless, and therefore, the fluorite tailings are treated by the lime;

and step 3: performing recycling test research on tailing water, namely performing flocculation sedimentation on the tailing water by adding lime and GS-2 into the tailing water obtained in the step 1, performing size mixing by adopting sulfuric acid, and standing to obtain clear tailing water; then returning the treated tailing water to a backwater collecting barrel in time, and simultaneously carrying out ore treatment processing work in the step 1 by using a water source in the recovering barrel to replace domestic water in the step 1, and ensuring continuous recycling of the water source through the collecting barrel;

and 4, step 4: and (2) treating the tailing water by using polymeric ferric sulfate, treating the tailings obtained in the step (1) by using a medicament combination of PAM, a flocculating agent SS and polymeric ferric sulfate, wherein the medicament dosage is as follows: PAM65g/t, a flocculating agent SS65g/t and polymeric ferric sulfate 1200g/t, wherein the medicament system is adopted in a tailing sedimentation test, when PAM65g/t, a flocculating agent SS65g/t and polymeric ferric sulfate 1200g/t are adopted, the tailing sedimentation speed is high, the sedimentation effect is good, clear tailing water can be obtained after standing for 1 hour, and the obtained tailing water is used in the ore treatment work in the step 1.

Preferably, the number of times of tungsten scavenging in the step 1 is three

Preferably, in the step 1, the magnetic separation is carried out by using a magnetic roller

Preferably, the grinding fineness of the ore in the step 1 is 200 meshes

Preferably, the agents used in the step 1 test are all commonly used agents

Preferably, the amount of the return water in the step 3 accounts for 72 to 78 percent of the total water consumption of the test

Preferably, the return water collecting barrel in the step 3 is provided with a liquid level alarm module for preventing the liquid level from being lower than a normal value

Preferably, the water used in the operations of ore grinding, magnetic separation and flotation in the step 2, the step 3 and the step 4 is treated tailing water

Preferably, the beneficiation processes in the step 1, the step 3 and the step 4 are the same.

Compared with the prior art, the invention has the beneficial effects that:

after the tailing water is recycled, the cost of flotation operation chemicals is slightly increased due to the increase of the using amount of sodium carbonate, and the cost is increased by about 0.44 yuan/ton of raw ore; the cost of the medicament treated by the liquid medicine for the combination of lime and GS-2 is about 0.71 yuan/ton of raw ore, and the cost of the medicament treated by the liquid medicine for the combination of PAM, flocculating agent SS and polymeric ferric sulfate is about 2.03 yuan/ton of raw ore; the lime and GS-2 combined drug is adopted, and 1.32 yuan/ton of raw ore is saved compared with the PAM, the flocculating agent SS and the polymeric ferric sulfate combined drug; compared with the polymeric ferric sulfate scheme, the lime scheme not only has low cost of water treatment chemicals, but also can basically eliminate the adverse effect of recycling the tailing water by adjusting the system of the beneficiation chemicals.

Drawings

FIG. 1 is a block diagram of the steps of the present invention;

FIG. 2 is a schematic diagram of a closed-circuit test process for flotation of fluorite from molybdenum, bismuth and tungsten used in domestic water according to the present invention;

FIG. 3 is a schematic diagram showing the results of a closed-circuit test of flotation of fluorite, molybdenum, bismuth and tungsten, which is used as domestic water in the invention;

FIG. 4 is a schematic illustration of the effect of different coagulants of the present invention on the sedimentation height of tailings water;

FIG. 5 is a schematic illustration of the effect of lime dosage on tailing water settling height according to the present invention;

FIG. 6 is a schematic diagram showing the results of a closed-circuit flotation test for directly recycling tailing water treated by lime and GS-2 to fluorite molybdenum, bismuth and tungsten;

FIG. 7 is a schematic diagram showing the results of a closed-loop flotation test for recycling of Mo, Bi, W fluorite from tailings water treated by lime and GS-2 according to the present invention;

FIG. 8 is a schematic view of a closed-loop test flow of recycling of tailing water after the treatment of lime and GS-2 according to the present invention;

FIG. 9 is a schematic diagram showing the results of a flotation closed circuit test for direct recycling of tailings water after PAM + flocculant SS + polymeric ferric sulfate treatment according to the present invention;

FIG. 10 is a schematic diagram showing the results of a closed-loop test of recycling tailing water after the treatment of PAM, a flocculating agent SS and polymeric ferric sulfate;

FIG. 11 is a schematic view of a recycling test flow of the tailing water treated by PAM, flocculant SS and polymeric ferric sulfate according to the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-11, a method for treating and recycling tailings water includes the following steps:

step 1: the test research of the domestic water, carry on the small-scale test research according to on-the-spot technological process and medicament system, the medicament used in the experiment is the medicament that the factory is using, the water used for the experiment is the domestic water; the specific test flow and the medicament system are shown in figure 2, the test result is shown in figure 3, and as can be seen from figure 2, the molybdenum content of the molybdenum-bismuth mixed rough concentrate is 1.79 percent, the recovery rate is 85.94 percent, the bismuth content is 2.41 percent, and the recovery rate is 68.10 percent by adopting domestic water; the grade of the tungsten concentrate is 31.28 percent of WO3, and the recovery rate is 70.80 percent; the grade of the fluorite concentrate is 91.99 percent of CaF2, the recovery rate is 70.97 percent, the test tailings are not easy to settle, the upper layer liquid is still very turbid after standing for 24 hours, and more solid suspended matters exist, so that the tailing water treatment test is carried out.

Step 2: because a large amount of medicaments such as water glass, sodium carbonate, a collecting agent, a foaming agent and the like are used in the flotation test, the test tailings are not easy to settle, and the tailing water is in a stable colloid dispersion state and cannot be clarified;

selecting conventional water treatment agents of calcium chloride, alum and lime to perform a tailing water sedimentation test, destroying the colloid state of upper-layer liquid of fluorite tailings, and settling to obtain upper-layer clear liquid; when the dosage of the medicament is 1200g/t, the relationship between the calcium chloride, the alum, the lime and the sedimentation height of the tailings is shown in figure 4; in the three coagulants, the fluorite tailings are more easily settled by lime, and the fluorite tailings water is treated by the lime, so that the obtained supernatant is clearer and nearly colorless; under the same condition, the calcium chloride and the alum are adopted to treat the fluorite tailings, so that the sedimentation speed is low, the sedimentation quality is poor, the upper-layer liquid is still turbid and is not clear, the color of the supernatant after the alum treatment is darker, and the overall treatment effect is not as good as that of lime; therefore, lime is selected to treat the fluorite tailings;

when the lime consumption is lower than 1000g/t, the fluorite tailing water has slight flocculation, but the liquid at the upper layer is still very turbid, and obvious layering still does not occur after standing for 3 hours, so that the supernatant cannot be obtained. The influence of lime dosage on the sedimentation height of the tailing water is shown in fig. 5, the larger the lime dosage is, the faster the sedimentation speed of the tailing water is, when the lime dosage is 1800g/t, the better the sedimentation effect is, and the turbid tailing water is quickly layered to obtain supernatant; when the lime consumption is too large, the calcium ion content in the tailing water is high, and the product index is influenced by returning to the main flow; therefore, the fluorite tailing water is treated by selecting the activating agent GS-2 matched with lime, so that the influence of overhigh calcium ion content on subsequent flotation operation is reduced; when the dosage of an activator GS-2 is 250g/t and the dosage of lime is 1200g/t, the sedimentation curve of the fluorite tailing water is close to that of the fluorite tailing water when the dosage of the lime is 1800g/t, the pH value of the sedimentated fluorite tailing water is about 9.5, H2SO4 is adopted to carry out size mixing on the tailing water, and the pH value is adjusted to 7-8; when the lime dosage is 1800g/t, the H2SO4 dosage is 370 g/t; the using amount of lime is 1200g/t, when the using amount of an activating agent GS-2 is 250g/t, the using amount of H2SO4 is 100 g/t; finally, the obtained tailing water is reused for each operation of the main process; the cost of the lime is calculated according to the market price of 500 yuan/ton, the cost of the agent treated by the activating agent GS-2 is calculated according to the market price of 300 yuan/ton, the cost of the agent treated by the lime water alone is about 1.01 yuan/ton raw ore, and the cost of the agent treated by the combination of the lime and the GS-2 by the liquid medicine is about 0.70 yuan/ton raw ore, so that the cost of the agent is reduced by 0.31 yuan/ton raw ore and 30.96 percent.

And step 3: concentrating the middling and concentrate filtrate into tailings, performing flocculation sedimentation by adding lime and GS-2, performing size mixing by adopting sulfuric acid, and standing to obtain clear tailing water; returning the tailing water to a backwater collecting barrel in time for continuous recycling, wherein the backwater amount accounts for about 76% of the total water consumption of the test;

in order to investigate the influence of the recycling of the tailing water on the beneficiation indexes, the test flow and the medicament system of the domestic water test are continuously adopted under the condition of not changing the beneficiation process, the specific test flow and the medicament system are shown in figure 2, and the test result is shown in figure 6 after 10 times of circulation of the tailing water; as can be seen from the data in the figure, compared with the test result of domestic water, the grade and recovery rate of molybdenum in the mixed rough molybdenum-bismuth concentrate are reduced after the tailing water is directly reused, and the recovery rate of molybdenum is reduced by 7.38 percent; the grade and the recovery rate of tungsten in the tungsten concentrate are reduced, and the recovery rate of tungsten is reduced by 7.22 percent; the grade and recovery rate of fluorite concentrate fluorite are reduced, and the grade of fluorite is only 87.41 percent;

aiming at the situation, the medicament system is pertinently adjusted, the recovery of molybdenum is enhanced by increasing the using amount of kerosene, the inhibition on useful minerals of tungsten and fluorite is reduced by reducing the using amount of water glass, and the adjusted test flow and the medicament system are shown in figure 8. The production and recycling process of the beneficiation wastewater of the tailing water recycling test is shown in fig. 8. After 77 times of circulation, all indexes of the tailing water are basically stable, and the specific flotation test result is shown in figure 7;

finally, the following can be obtained: the molybdenum content of the molybdenum-bismuth mixed rough concentrate is 1.85 percent, the recovery rate is 84.93 percent, the bismuth content is 2.64 percent, and the recovery rate is 66.76 percent; the grade of the tungsten concentrate is 31.89 percent, WO3 and the recovery rate is 74.44 percent; the grade of fluorite concentrate is 90.27 percent, CaF2, and the recovery rate is 73.76 percent;

after the tailing water is recycled, the grades of molybdenum and bismuth in the molybdenum-bismuth mixed rough concentrate are slightly improved, and the recovery rates of the molybdenum and the bismuth are respectively reduced by 1.01 percent and 1.34 percent; the grade of tungsten in the tungsten concentrate is basically close to that in the domestic water test, and the recovery rate is improved by 3.64 percent compared with that in the domestic water test; the grade of the fluorite concentrate fluorite is basically close to that of the domestic water test, and the recovery rate is improved by 2.79 percent compared with that of the domestic water test.

And 4, step 4: the tailings are treated by adopting the medicament combination of PAM, flocculating agent SS and polymeric ferric sulfate, and the dosage of the medicament is as follows: PAM65g/t, flocculant SS65g/t, polymeric ferric sulfate 1200g/t, the medicament system is adopted in the tailings sedimentation test; when PAM65g/t, flocculant SS65g/t and polyferric sulfate 1200g/t are adopted, the tailing sedimentation speed is high, the sedimentation effect is good, and clear tailing water can be obtained after standing for 1 hour;

in order to investigate the influence of the recycling of the tailing water on the mineral separation index, the test flow and the reagent system of the domestic water test are continuously adopted under the condition of not changing the mineral separation process, the specific test flow and the reagent system are shown in figure 2, the test result is shown in figure 9 after 8 times of circulation of the tailing water, and the data in the table show that compared with the test result of the domestic water, the direct recycling of the tailing water treated by the scheme of PAM + flocculating agent SS + polymeric ferric sulfate has certain influence on each product: the yield of the molybdenum-bismuth mixed rough concentrate is increased, so that the grades of molybdenum and bismuth are greatly reduced, the grade of molybdenum is reduced to 1.27%, and the grade of bismuth is reduced to 1.72%; the recovery of tungsten in tungsten flotation operation is favorably influenced, the grade and the recovery rate of tungsten in tungsten concentrate are slightly improved, and the operation recovery rate of tungsten is increased by 4.69 percent; adverse effects are caused to fluorite flotation operation, the grade of fluorite concentrate is not up to standard, the recovery rate is greatly reduced, the grade of fluorite concentrate is 84.92%, the recovery rate is only 57.03%, and 13.94% is reduced;

according to the test results, the reagent system is specifically adjusted, the amount of BK205 is reduced, the floating amount of the molybdenum-bismuth mixed rough concentrate is reduced, the amount of kerosene is increased, the recovery of molybdenum is enhanced, the amount of water glass is reduced, the amount of CYP serving as a collecting agent is increased, the inhibition on fluorite is reduced, and the adjusted test flow, the reagent system, and the generation and recycling processes of mineral processing wastewater are shown in FIG. 11; after the tailing water is circulated for 40 times, all indexes are basically stable, and the specific flotation test result is shown in figure 10;

from the data in FIG. 10, it can be seen that: after the tailing water is recycled, the grade and recovery rate of molybdenum and bismuth of the molybdenum-bismuth mixed rough concentrate are basically close to the indexes of domestic water tests; the grade of tungsten in the tungsten concentrate is improved by 3.05 percent, and the recovery rate of tungsten is improved by 4.89 percent; the recovery rate of fluorite concentrate fluorite is basically close to the test index of domestic water, and the grade of fluorite is only 81.86 percent, so that the grade is reduced by 10.13 percent.

Scheme comparison: the two treatment schemes of lime and polymeric ferric sulfate are adopted, the water glass and sodium carbonate are used for the reagents with large dosage change after the tailing water is recycled, and the dosage change of other reagents is small. The total consumption of the water glass is reduced to 3075g/t and 950g/t from the original 4025 g/t; the total amount of sodium carbonate is increased from 1250g/t to 1850g/t, which is increased by 600 g/t. The water glass is calculated according to the market price of 800 yuan/ton, the sodium carbonate is calculated according to the market price of 2000 yuan/ton, and the cost of the flotation operation medicament is slightly increased due to the increase of the using amount of the sodium carbonate, and the cost is increased by about 0.44 yuan/ton.

The dosage of lime of the lime and GS-2 combined medicine is 1200g/t, the dosage of the activating agent GS-2 is 250g/t, and the dosage of sulfuric acid is 100 g/t. The cost of the chemical agent treated by the combination of lime and GS-2 is about 0.71 yuan/ton of raw ore.

The dosage of PAM, flocculating agent SS and polymeric ferric sulfate is 65g/t, 65g/t and 1200 g/t. The price of polyferric sulfate is 1500 yuan/ton, the price of PAM is 2400 yuan/ton, the price of flocculating agent SS is 1200 yuan/ton, and the medicament cost of the PAM, flocculating agent SS and polyferric sulfate combined medicament is about 2.03 yuan/ton and raw ore.

In conclusion, the chemical cost for treating the tailing water by adopting the lime scheme and the chemical cost for treating the lime and GS-2 combined liquid medicine is about 0.71 yuan/ton of raw ore; the chemical cost of the drug for treating the tailing water by adopting the polyferric sulfate scheme and the combination of PAM, flocculating agent SS and polyferric sulfate by using the liquid medicine is about 2.03 yuan/ton of raw ore. Compared with the lime scheme, the polymeric ferric sulfate scheme has high cost of water treatment agent.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.