Rapid detection and sulfur reduction method for sulfate minerals in iron ore concentrate

Abstract

The invention discloses a method for rapidly detecting and reducing sulfur in sulfate minerals in iron ore concentrate, which is characterized in that titration blank control detection is carried out on the iron ore concentrate to find that the content of sulfur in the iron ore concentrate exceeds the standard and the content of gypsum in the iron ore concentrate is too high; in the beneficiation process, a proper process link, namely a thickener thickening link, is found, the process link meets the time and space requirements required by the sulfur reduction reaction, the purpose of reducing sulfur of the iron ore concentrate is achieved by adding the sulfur reduction agent, the addition amount of the required sulfur reduction agent in the process is small, the use cost of the sulfur reduction agent is low, and the method is suitable for industrial production. The calcium ion complexing agent sodium citrate is added, so that the sulfur reduction reaction time is shortened, the sulfur reduction process can be fully completed in the thickening link of the thickener, and no extra equipment needs to be purchased; the sulfur content in the iron ore concentrate is reduced by 0.2%-0.4%, the quality of the iron ore concentrate is improved, and at least 4 million economic benefits can be brought every year.

Description

Technical Field

[0001] The invention relates to the technical field of iron ore concentrate desulfurization, and more specifically to a method for rapid detection and desulfurization of sulfate minerals in iron ore concentrate. Background Art

[0002] Sulfur is a harmful element in steel. Excessive sulfur content in iron ore will seriously affect the subsequent smelting process and quality. According to statistics, for every 0.1% increase in sulfur content in iron ore, the coke ratio of blast furnace smelting will increase by 5%. Therefore, the sulfur impurity content in iron ore should be strictly controlled.

[0003] The sulfur element in iron concentrate mainly exists in the form of pyrite and pyrite. For the desulfurization of pyrite and pyrrhotite in iron concentrate, magnetic flotation is usually used. For the specific iron concentrate beneficiation process, please refer to Figure 1 shown.

[0004] For example, Chinese patent CN112058500A provides a beneficiation method for comprehensive utilization of magnetite concentrate flotation desulfurization foam products. The iron concentrate with TS content between 12.0% and 15.0% is flotated using sodium silicate as a dispersant, butyl xanthate as a collector, and 2# oil as a frother. After flotation, a low-sulfur iron concentrate with a TS grade of less than 0.95% can be obtained.

[0005] For example, Chinese patent CN110508392A provides a method for magnetic-flotation separation and comprehensive utilization of high-sulfur magnetite concentrate. The iron concentrate with a TS content of about 15% is flotated using oxalic acid as a chelating agent, copper sulfate as an activator, butyl xanthate + butyl ammonium black powder (1:1) as a collector, and 2# oil as a frother. After flotation, a low-sulfur iron concentrate with a TS grade of less than 1.06% is obtained.

[0006] After the iron concentrate is desulfurized by magnetic separation and flotation by the above two methods, the ore pulp still contains other sulfide minerals other than pyrite and pyrrhotite, and the sulfur content is about 1%, which cannot meet the standard of the internal concentrate product of the concentrator that the sulfur content is less than 0.6%. Therefore, for some iron concentrates containing other sulfide minerals, simple flotation and magnetic separation cannot meet the steel plant's requirements for the sulfur content of raw materials.

[0007] In view of the serious harm of sulfur to the steel smelting process, and the problem that sulfide minerals cannot be detected after flotation and magnetic separation of some iron concentrates during the ore dressing process, and the sulfur content cannot be reduced to the established target range. The present invention provides a method for rapid detection and sulfur reduction of sulfate minerals in iron concentrates. Summary of the invention

[0008] In order to overcome the above-mentioned defects of the prior art, the present invention provides a method for rapid detection and sulfur reduction of sulfate minerals in iron concentrate, so as to solve the problem that sulfate minerals in iron concentrate cannot be detected under the existing mineral processing process conditions and it is difficult to solve the problem of excessive sulfur content in iron concentrate. The rapid detection of sulfide minerals in iron concentrate is realized, and in the iron concentrate mineral processing process, a specific process link is found, which creates conditions for reducing the sulfur content of iron concentrate to a predetermined target range. By adding a sulfur-reducing agent to the specific process link (thickening of the thickener), the sulfur content in the iron concentrate is reduced and the quality of the iron concentrate is improved.

[0009] In one aspect, the present invention provides a method for rapid sulfur reduction in iron ore concentrate, comprising the following steps:

[0010] Step S1, taking the iron ore concentrate to be processed and following the steps of step 1 and step 2 to obtain the iron ore concentrate slurry to be processed after sedimentation;

[0011] Step S2, based on the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron ore concentrate in step 6, to obtain the sulfate content in the iron ore concentrate slurry to be treated;

[0012] Step S3, according to the sulfate content in the iron ore concentrate slurry to be processed, taking soda ash (Na2CO3) and sodium citrate to make a solution and pouring it into the wet grinding, beneficiation, thickening and filtering equipment in the beneficiation process respectively;

[0013] Step S4, turning on the wet grinding, beneficiation, thickening and filtering equipment in the beneficiation process, wherein the speed of the thickening well stirring device in the thickening process is set to 10-30r / min, the stirring time is controlled at 120-160min, and the reaction temperature is controlled at 30-40°C;

[0014] Step S5, after the sulfur reduction reaction in each process link is completed, the sulfate content in the iron concentrate is obtained according to the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron concentrate, and converted into sulfur content by calculation to determine whether the iron concentrate meets the standard after sulfur reduction in different mineral processing links.

[0015] Another aspect of the present invention provides a method for rapid detection of sulfate minerals in iron concentrate, comprising the following steps:

[0016] Step 1, wet grinding and beneficiation of the iron ore, and the grinding particle size is controlled to be 200-400 mesh, accounting for 60-95% of the total weight of the iron ore dry basis, and the dissociation degree of the iron ore is 60-90%;

[0017] Step 2, transporting the iron ore concentrate slurry obtained in step 2 to a thickening well for sedimentation, and controlling the solid content of the iron ore concentrate slurry to be 10%-20%;

[0018] Step 3, take 100 ml of the upper clear liquid in the dense well, dilute it 10 times, and divide the diluted clear liquid equally into two containers, add 1 mol / L sodium carbonate solution (excess) and 1 mol / L barium chloride standard solution to container 1, and add 1 mol / L barium chloride standard solution to container 2, and titrate until no precipitation is produced in the two containers. The temperature of the titration process is controlled at 30-40°C.

[0019] Step 4, observe the amount of BaCl2 solution added in containers 1 and 2. When the difference between the amount of BaCl2 solution added is more than 20%, it can be said that the component of the sulfide mineral is sulfate (gypsum). At this time, record the amount of barium chloride standard solution added and convert it into the content of sulfate in the supernatant;

[0020] Step 5, uniformly load the bottom solid in the dense well, send it for EDS spectrum inspection after drying, and record the sulfate content therein;

[0021] Step 6, adding the sulfate content in the supernatant to the sulfate content in the iron concentrate at the bottom of the thickening well to obtain the total sulfur content in the iron concentrate;

[0022] Step 7, draw a relationship diagram between the amount of BaCl2 added and the sulfate content in the iron concentrate under different dissociation degree conditions.

[0023] Technical effects and advantages of the present invention:

[0024] 1. The process is simple, low-cost, efficient, rapid and accurate. Through the titration blank control test of iron ore concentrate, it was found that the excessive sulfur content in the iron ore concentrate was caused by the excessive gypsum content;

[0025] 2. A suitable process link (thickening of the thickener) was found in the mineral processing process. This process link meets the time and space requirements for the desulfurization reaction. By adding a desulfurizer, the purpose of desulfurization of iron ore concentrate is achieved. The amount of desulfurization reagent required in the process is small, and the cost of using the desulfurizer is low. In addition, by adding the calcium ion complexing agent sodium citrate, the time of the desulfurization reaction is accelerated, so that the desulfurization process can be fully completed in the thickening link of the thickener without the need to purchase additional equipment;

[0026] 3. Reducing the sulfur content in iron ore concentrate by 0.2%-0.4% has improved the quality of iron ore concentrate and increased the selling price of iron ore concentrate by 40-80 yuan per ton. Based on the annual output of 100,000 tons of iron ore exceeding the standard, it can bring at least 4 million yuan in economic benefits each year. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the drawings:

[0028] Figure 1 It is a flowchart of the rapid detection method of sulfate minerals in iron concentrate of the present invention;

[0029] Figure 2 It is a flow chart of the iron ore concentrate beneficiation process in the prior art of the present invention;

[0030] Figure 3 The graph of BaCl2 addition amount and sulfate content in iron concentrate of the present invention;

[0031] Figure 4 It is a graph showing the relationship between the sulfur reduction rate and the sulfur reduction reaction time of the present invention;

[0032] Figure 5 It is a graph of sulfur content under different sodium citrate concentration conditions of the present invention. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Embodiment 1

[0035] like Figure 1 As shown, the present invention provides a method for rapid sulfur reduction of iron ore concentrate, comprising the following steps:

[0036] Step S1, taking the iron ore concentrate to be processed and following the steps of step 1 and step 2 to obtain the iron ore concentrate slurry to be processed after sedimentation;

[0037] Step S2, based on the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron ore concentrate in step 6, to obtain the sulfate content in the iron ore concentrate slurry to be treated;

[0038] Step S3, according to the sulfate content in the iron ore concentrate slurry to be processed, taking soda ash (Na2CO3) and sodium citrate to make a solution and pouring them into a wet grinder, a ore dressing machine, a thickening well, and a filter respectively;

[0039] Step S4, turning on the wet mill, concentrator, thickening well, and filter equipment in the mineral processing process, wherein the speed of the thickening well stirring device is set to 10-30 r / min, the stirring time is controlled at 120-160 min, and the reaction temperature is controlled at 30-40° C.;

[0040] Step S5, after the sulfur reduction reaction in each process link is completed, the sulfate content in the iron concentrate is obtained according to the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron concentrate, and converted into sulfur content by calculation to determine whether the iron concentrate meets the standard after sulfur reduction in different mineral processing links.

[0041] In the wet grinding process, due to the high temperature of the slurry and the large number of bubbles blowing into the slurry, the desulfurizer partially deteriorated, which seriously affected the desulfurization effect. Under the optimal desulfurization conditions, the desulfurization effect was not good, and the desulfurization rate did not exceed 0.1%. The iron ore concentrate after desulfurization did not meet the standards.

[0042] In the mineral processing process, since other mineral processing reagents are added to the ore slurry, and then the desulfurizer is added thereto, there will be a certain impact between the two reagents, which will have a certain impact on the mineral processing process and the desulfurization reaction at the same time. Under the optimal desulfurization conditions, the desulfurization effect is not good, and the desulfurization rate does not exceed 0.08%. The iron concentrate after desulfurization does not meet the standards.

[0043] In the filtration process, due to the short operation time of the filtration process, when the desulfurizer is added, the reaction time between the iron ore concentrate slurry and the desulfurizer is very short, the reaction is not thorough, the desulfurization effect is very poor, and the desulfurization rate does not exceed 0.05%. The iron ore concentrate after desulfurization does not meet the standards.

[0044] In the thickening process, the time and space requirements for the desulfurization reaction are met. By adding desulfurizers, the purpose of desulfurizing the iron ore is achieved. The desulfurization effect is very good, and the desulfurization rate can reach 0.2%-0.4%. The iron ore after desulfurization meets the standards.

[0045] Embodiment 2

[0046] A rapid detection method for sulfate minerals in iron concentrate of the present invention comprises the following steps:

[0047] Step 1, see Figure 2 , wet grinding and beneficiation of iron ore, and the grinding control intensity is 200-400 mesh accounting for 60-95% of the total weight of the iron ore dry basis, and the dissociation degree of the iron ore is 60%-90%;

[0048] Step 2, transporting the iron ore concentrate slurry obtained in step 2 to a thickening well for sedimentation, and controlling the solid content of the iron ore concentrate slurry to be 10%-20%;

[0049] Step 3, take 100 ml of the supernatant in the dense well, dilute it 10 times, add a 1 mol / L barium chloride standard solution until no precipitation occurs, record the amount of barium chloride added, and convert it into the sulfate content in the supernatant;

[0050] Step 4, uniformly load the bottom solid in the dense well, send it for EDS spectrum inspection after drying, and record the sulfate content therein;

[0051] Step 5, adding the sulfate content in the upper clear liquid and the sulfate content in the bottom solid to obtain the sulfur content in the iron concentrate;

[0052] Step 6, draw a relationship graph between the amount of BaCl2 added and the sulfate content in the iron ore concentrate.

[0053] Embodiment 3

[0054] A rapid detection method for sulfate minerals in iron concentrate comprises the following steps:

[0055] In the first step, the iron ore concentrate is ground (wet grinding) and beneficiated (flotation, magnetic separation). The grinding is controlled to a particle size of 200-400 mesh (0.074mm-0.038mm) accounting for 60-95% of the total dry weight of the iron ore concentrate, and the dissociation degree of the iron ore concentrate is controlled at about 60%-90%.

[0056] In the second step, the iron ore concentrate slurry after grinding and beneficiation is transported to the thickening well through a pipeline for sedimentation; in order to ensure the fluidity of the iron ore concentrate slurry, the solid content of the iron ore concentrate slurry is controlled at 10%-20%.

[0057] The third step is to evenly take 100 ml of the supernatant in the dense well, dilute it 10 times, and add 1 mol / L barium chloride standard solution until no precipitation is produced. Record the amount of barium chloride added and convert it into the sulfate content in the supernatant.

[0058] The fourth step is to evenly load the bottom solid in the dense well, dry it, and send it for EDS spectrum inspection to record the sulfate content.

[0059] The fifth step is to add the sulfate content in the upper clear liquid and the sulfate content in the bottom solid to obtain the sulfur content in the iron ore concentrate.

[0060] Step 6: Draw a graph showing the relationship between the amount of BaCl2 added and the sulfate content in the iron ore concentrate. Figure 3 As shown, it provides a solution for quickly detecting the sulfate content in iron concentrate in the actual production process.

[0061] Embodiment 4

[0062] A method for reducing sulfur in sulfate minerals in iron concentrate comprises the following steps: the first step is to grind (wet grind) and beneficiate (flotation, magnetic separation) the iron concentrate, the grinding is controlled to a particle size of 200 mesh (0.074 mm) accounting for 60-95% of the total dry weight of the iron concentrate, and the dissociation degree of the iron concentrate is controlled to be about 50%.

[0063] In the second step, the iron ore concentrate slurry after grinding and beneficiation is transported to the thickening well through a pipeline for sedimentation; in order to ensure the fluidity of the iron ore concentrate slurry, the solid content of the iron ore concentrate slurry is controlled at 10%-20%.

[0064] The third step is to obtain the sulfate content in the iron ore at 3.22% based on the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron ore concentrate.

[0065] The fourth step is to take 10L of iron ore concentrate slurry with a solid content of 20% and add it to concentrated well water, and add 127.2g-296.8g of sulfur reducer soda ash (Na2CO3) to make the initial concentration of the sulfur reducer soda ash (Na2CO3) 0.15mol / L-0.35mol / L.

[0066] The fifth step is to turn on the thickening well stirring device, set the speed to 10-30r / min, control the stirring time to 120-160min, and control the reaction temperature to 40-50℃.

[0067] The sixth step is to obtain the sulfate content in the iron concentrate based on the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron concentrate after the sulfur reduction reaction is completed, and convert it into sulfur content through calculation to determine whether the iron concentrate meets the standards after sulfur reduction.

[0068] Table 1 Sulfur reduction rate under different sulfur reduction reaction time conditions

[0069]

[0070] Combined with Table 1, Figure 4 It can be seen that adding soda ash as a sulfur reducer can effectively reduce the gypsum content in iron concentrate. For desulfurization of gypsum-containing iron concentrate, the optimal initial concentration of soda ash is 0.25mol / L-0.30mol / L. Below this concentration, the desulfurization is incomplete, and above this concentration, the sulfur reduction efficiency of soda ash decreases. The optimal sulfur reduction reaction time is 150min. Below this reaction time, the sulfur reduction reaction is incomplete, and above this reaction time, time cost is wasted.

[0071] Embodiment 5

[0072] A method for reducing sulfur in sulfate minerals in iron concentrate comprises the following steps: the first step is to grind (wet grind) and beneficiate (flotation, magnetic separation) the iron concentrate, the grinding is controlled to a particle size of 200 mesh (0.074 mm) accounting for 60-95% of the total dry weight of the iron concentrate, and the dissociation degree of the iron concentrate is controlled to be about 50%.

[0073] In the second step, the iron ore concentrate slurry after grinding and beneficiation is transported to the thickening well through a pipeline for sedimentation; in order to ensure the fluidity of the iron ore concentrate slurry, the solid content of the iron ore concentrate slurry is controlled at 10%-20%.

[0074] The third step is to obtain the sulfate content in the iron ore at 6.22% based on the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron ore concentrate.

[0075] The fourth step is to take 10L of iron ore concentrate slurry with a solid content of 20% and add it to concentrated well water, add 212g of sulfur reducer soda ash (Na2CO3) to make the initial concentration of the sulfur reducer soda ash (Na2CO3) 0.25mol / L; add sodium citrate to control the initial concentration at 0.05mol / L-0.15mol / L.

[0076] The fifth step is to open the thickening well stirring device, set the speed to 10-30r / min, control the stirring time to 120-160min, and control the reaction temperature to 40-50℃.

[0077] The sixth step is to obtain the sulfate content in the iron concentrate based on the relationship between the amount of BaCl2 added and the sulfate content in the iron concentrate after the sulfur reduction reaction is completed, and convert it into sulfur content through calculation to determine whether the iron concentrate meets the standards after sulfur reduction.

[0078] Table 2 Desulfurization rate under different sodium citrate concentration conditions

[0079]

[0080] Combined with Table 2, Figure 5 It can be seen that adding a certain concentration of sodium citrate can effectively improve the desulfurization efficiency. The optimal initial concentration of sodium citrate is 0.05mol / L-0.1mol / L. When the concentration is higher than this, the improvement effect is not significant, and the trend of increasing desulfurization rate slows down. Considering the relevant factors of the absorption and desorption process, the appropriate initial concentration of sodium citrate is determined to be 0.05mol / L-0.1mol / L. When the amount of sodium citrate added is 0.05mol / L-0.1mol / L, the reaction rate can be accelerated, so that the sulfur content in the iron concentrate participating in the desulfurization reaction in the dense well reaches the iron concentrate dressing standard 30 minutes in advance, which can ensure that the iron concentrate in the dense well has sufficient desulfurization reaction time.

[0081] Finally, the method of the present application is only a preferred implementation scheme and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for rapid detection and reduction of sulfate minerals in iron concentrate, characterized in that: The following steps are involved: Step S1, wet-grinding and beneficiating the iron ore concentrate and then transporting it to a thickening well for sedimentation to obtain the iron ore concentrate slurry to be processed after sedimentation; Step S2, based on the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron ore concentrate, to obtain the sulfate content in the iron ore concentrate slurry to be treated; Step S3, according to the sulfate content in the iron ore concentrate slurry to be processed, taking soda ash (Na2CO3) and sodium citrate to make a solution and pouring it into the thickening well; Step S4, turning on the thickening well stirring device, wherein the speed of the thickening well stirring device is set to 10-30 r / min, the stirring time is controlled at 120-160 min, and the reaction temperature is controlled at 30-40° C.; Step S5, after the desulfurization reaction is completed, the sulfate content in the iron concentrate is obtained according to the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron concentrate, and converted into sulfur content by calculation to determine whether the iron concentrate meets the standard after desulfurization.

2. The method for rapid detection and reduction of sulfate minerals in iron concentrate according to claim 1, characterized in that: In step S3, according to the sulfate content in the iron ore concentrate slurry to be processed, soda ash (Na2CO3) and sodium citrate are prepared into solutions and poured into a wet grinder, a ore dressing machine, and a filter respectively; Then turn on the wet mill, ore dressing machine and filter equipment in the ore dressing process. After the sulfur reduction reaction in each process link is completed, the sulfate content in the iron concentrate is obtained according to the relationship diagram between the amount of BaCl2 added and the sulfate content in the iron concentrate, and converted into sulfur content by calculation to determine whether the iron concentrate meets the standards after sulfur reduction in different mineral processing links; Among them, in the wet grinding process, due to the high slurry temperature and a large number of bubbles in the slurry, the desulfurizer was partially deteriorated, which seriously affected the desulfurization effect. Under the best desulfurization conditions, the desulfurization effect was not good, and the desulfurization rate did not exceed 0.1%. The iron ore concentrate after desulfurization did not meet the standards; Among them, in the mineral processing process, since other mineral processing reagents are added to the ore pulp, and then the sulfur reducing agent is added thereto, there will be a certain impact between the two reagents, which will have a certain impact on the mineral processing process and the desulfurization reaction at the same time. Under the optimal sulfur reduction conditions, the sulfur reduction effect is not good, and the sulfur reduction rate does not exceed 0.08%. The iron concentrate after sulfur reduction does not meet the standards; Among them, in the filtration process, due to the short operation time of the filtration process, the sulfur-reducing agent is added thereto, and the reaction time between the iron concentrate slurry and the sulfur-reducing agent is very short, the reaction is not thorough, the sulfur-reducing effect is very poor, and the sulfur-reducing rate does not exceed 0.05%. The iron concentrate after sulfur reduction does not meet the standards; Among them, in the thickening process link, the time and space requirements for the desulfurization reaction are met. By adding desulfurizers, the purpose of desulfurizing the iron concentrate is achieved. The desulfurization effect is very good, and the sulfur reduction rate can reach 0.2%-0.4%. The iron concentrate after desulfurization meets the standards.

3. A method for rapid detection and reduction of sulfate minerals in iron concentrate according to claim 1 or 2, characterized in that: In step S3, the optimal initial concentration of adding soda ash is 0.25 mol / L-0.30 mol / L, and the optimal initial concentration of adding sodium citrate is 0.05 mol / L-0.1 mol / L.

4. The method for rapid detection and reduction of sulfate minerals in iron concentrate according to claim 1, characterized in that: Detection methods for sulfate minerals include: Step 1, wet grinding and beneficiation of iron ore concentrate; Step 2, transporting the iron ore concentrate slurry obtained in step 2 to a thickening well for sedimentation; Step 3, dilute the supernatant in the dense well, divide the diluted supernatant into two containers, add 1 mol / L sodium carbonate solution and 1 mol / L barium chloride standard solution to container 1, add 1 mol / L barium chloride standard solution to container 2, titrate until no precipitation is produced in the two containers, and control the temperature of the titration process at 30-40°C; Step 4, observe the amount of BaCl2 solution added in containers 1 and 2. When the difference between the amount of BaCl2 solution added is more than 20%, it can be said that the composition of the sulfide mineral is sulfate-gypsum. At this time, record the amount of barium chloride standard solution added and convert it into the content of sulfate in the supernatant; Step 5, adding the sulfate content in the supernatant to the sulfate content in the iron concentrate at the bottom of the thickening well to obtain the total sulfur content in the iron concentrate; Step 6, draw a relationship diagram between the amount of BaCl2 added and the sulfate content in the iron concentrate under different dissociation degree conditions.

5. The method for rapid detection and reduction of sulfate minerals in iron concentrate according to claim 4, characterized in that: In the step 1, the ore grinding is controlled to have a particle size of 200-400 meshes, accounting for 60-95% of the total dry weight of the iron concentrate, and the degree of dissociation of the iron concentrate is 60-90%.

6. The method for rapid detection and reduction of sulfate minerals in iron concentrate according to claim 4, characterized in that: In step 2, the solid content of the iron ore concentrate slurry is controlled at 10%-20%.

7. The method for rapid detection and reduction of sulfate minerals in iron concentrate according to claim 4, characterized in that: In the step 1, inhibitors, activators, collectors and frothers are added during wet grinding; flotation and magnetic separation are used for mineral separation.

8. The method for rapid detection and reduction of sulfate minerals in iron concentrate according to claim 4, characterized in that: In step 3, 100 ml of the supernatant in the dense well was evenly loaded and diluted 10 times.

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