Method for determining optimal dressing and smelting fineness and method for efficiently recovering associated fragile beneficial minerals and iron ore concentrates in primary iron ore

Abstract

The invention discloses a method for determining the optimal ore grinding fineness of dressing and smelting and a method for efficiently recovering associated fragile beneficial minerals and iron ore concentrates in primary iron ore, the concentrate indexes under various fineness conditions are calculated according to process mineralogy parameters, then the optimal ore grinding fineness is obtained, and the method can be applied to the field of recovery of all minerals and dressing and smelting products. Based on the conception, the optimal first-stage grinding and second-stage grinding fineness is calculated in the method for recycling the associated fragile beneficial minerals and the iron ore concentrate in the primary iron ore, and under the first-stage grinding fineness, the ultra-pure iron ore concentrate / iron ore concentrate, the associated fragile beneficial mineral concentrate and the iron rough concentrate are obtained in sequence by adopting a magnetic separation-flotation combined method; and then the iron rough concentrate is finely ground to the second-stage grinding fineness, and then low-intensity magnetic separation is carried out to recover residual qualified iron concentrate. According to the method, the optimal ore grinding fineness can be determined in advance when ore dressing operation is not carried out, the optimal dressing and smelting technological process is formulated, the production cost can be reduced, the product quality can be improved, and high-quality utilization of resources is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of mineralogy of ore dressing process, and in particular relates to a method for determining the best grinding fineness for ore dressing and a method for efficiently recovering associated fragile beneficial minerals and iron concentrate from primary iron ore. Background Art

[0002] In the field of mineral processing technology, grinding fineness has a significant impact on mineral processing indicators and production costs. With the increase of grinding fineness, the concentrate grade will gradually increase, but when the grinding fineness exceeds a certain value, some of the first dissociated minerals will be micronized, so that some micron-grade target minerals are lost to the tailings during the mineral processing process, resulting in a decrease in recovery rate. Therefore, exploring the optimal grinding fineness for mineral processing is crucial to formulating a reasonable mineral processing process. However, the calculation of grinding fineness in the prior art has the following problems: the existing method is usually an experimental method. The laboratory usually grinds the ore to a certain fineness based on experience, and then conducts separation tests under different conditions such as magnetic separation, flotation, and gravity separation at these finenesses, and then compares the concentrate indicators. When both the recovery rate and the concentrate grade are high, the corresponding grinding fineness is the optimal grinding fineness. The concentrate indicators obtained by the existing experimental method are affected by the equipment processing capacity and energy consumption, the type and dosage of flotation reagents, which may lead to deviations in the optimal grinding fineness, and this method is time-consuming and labor-intensive and increases costs.

[0003] The iron minerals in primary iron ore are mainly magnetite or titanomagnetite. The commonly associated fragile beneficial minerals that can be comprehensively recovered are ilmenite, chalcopyrite, chalcocite, covellite, bornite, galena, molybdenite, wolframite, scheelite, fluorocarbon cerium or fluorite. These fragile beneficial minerals usually have two or more of the following characteristics: hardness between 1-3, brittleness, developed cleavage, developed cracks, and defects and weak links in the internal structure of the crystal.

[0004] In the field of mineral processing technology, a reasonable mineral processing process is of great significance. It can not only improve resource utilization, enhance product quality, reduce production costs, but also reduce environmental pollution. Since magnetite / titanium magnetite has strong magnetism and is obviously different from the above-mentioned associated brittle minerals that can be comprehensively recycled, iron is usually selected first in the mineral processing process.

[0005] At present, in the field of mineral processing technology, the process of preferential iron selection has been adopted, and the iron grade in the iron concentrate is gradually improved through step-by-step grinding and weak magnetic separation. However, since the fragile and beneficial materials that can be comprehensively recovered, such as ilmenite, chalcopyrite, chalcocite, covellite, bornite, galena, molybdenite, wolframite, scheelite, fluorocarbon cerium ore or fluorite, are easy to be broken and muddy during the step-by-step grinding and selection process, when qualified iron concentrate is obtained, the proportion of the micro-particle level of the fragile and beneficial minerals that can be comprehensively recovered in the iron tailings is extremely high, which ultimately makes it difficult to recover these fragile and beneficial minerals, resulting in a low recovery rate of the comprehensive recovery of beneficial elements.

[0006] The step-milling and step-selection weak magnetic separation operations gradually improve the iron grade of the concentrate. In the second-stage grinding process, the beneficial minerals that were in monomers and rich intergrowths during the first-stage grinding will be ground into fine particles. In the third-stage grinding process, the beneficial minerals that were in monomers and rich intergrowths during the second-stage grinding will be ground into fine particles, and even the beneficial minerals that were in monomers and rich intergrowths during the first-stage grinding will be muddied, resulting in an excessively high proportion of microparticle-level associated beneficial minerals, which affects the recovery rate of beneficial elements.

[0007] Although the step-milling and step-selection priority iron selection process can obtain qualified iron concentrate, the loss of associated fragile beneficial minerals that can be comprehensively recovered is serious, resulting in the company's initial iron selection investment costs being difficult to be compensated by enriching the associated fragile beneficial minerals that can be comprehensively recovered, reducing the resource utilization and economic benefits of the entire mineral processing process. Summary of the invention

[0008] In order to overcome the problems in the prior art, the present invention provides a method for determining the optimal grinding fineness for ore dressing and a method for efficiently recovering associated fragile beneficial minerals and iron concentrate in primary iron ore. The method of the present invention can determine the optimal grinding fineness for ore dressing in advance before ore dressing operations are carried out, thereby avoiding wasting time and energy, saving costs, and providing a scientific basis for the formulation of ore dressing process flow.

[0009] In order to solve the above technical problems, the technical solution proposed by the present invention is: The present invention provides a method for determining the optimal grinding fineness for ore dressing and smelting, comprising the following steps: S1. Grind the raw ore into a powder sample without sand feeling, select representative samples by reduction, and conduct chemical multi-element analysis to clarify the grade α of the target element in the raw ore.

[0010] S2. Grind the raw ore to different finenesses, make optical slices of samples of different finenesses, and then measure the weight content W of the target mineral to be processed in different samples, the content D of the target element in the target mineral, the particle size and dissociation degree of the target mineral.

[0011] S3, calculating the technical indicators of the concentrate at the corresponding fineness according to the data obtained in steps S1 and S2, the technical indicators including the concentrate yield , the grade of target element in the concentrate and the recovery of target elements in the concentrate .

[0012] S4. Benchmark the concentrate indicators against the industry standards. When the concentrate grades at different finenesses all reach the values ​​of the industry standards, the fineness corresponding to the highest concentrate yield and target element recovery rate under each fineness condition is the optimal grinding fineness. When the concentrate grade at an individual fineness does not reach the value of the industry standard, gradually adjust the concentrate grade value to the value of the industry standard, and adjust the concentrate yield and target element recovery rate accordingly. After the adjustment, the fineness corresponding to the highest concentrate yield and target element recovery rate under each fineness condition is the optimal grinding fineness.

[0013] As an optional embodiment, in the method provided by the present invention, the method for calculating the concentrate index comprises the following steps: (1) After the selected representative samples are made into optical slices, the particle size of the target mineral is measured to obtain the proportion of the target mineral with a particle size of more than 800 mesh in the sample, which is recorded as A.

[0014] (2) The conjoined bodies are measured by the n-point method. The calculation method of the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements ; Among them, when n=0, B0 is the distribution rate of the monomer, and C0 is the constant of the monomer corresponding to B0; when n>0, B n is the distribution rate of conjoined bodies, C n For B n The constant corresponding to the conjoined body.

[0015] In the present invention, step S2 specifically includes the following steps: The conjoined bodies were measured by the n-division method, and the monomer distribution rate was recorded as B0. The distribution rate of ≤ conjoined bodies <1 is recorded as B1, ≤Conjoined< The distribution rate of is denoted as B2, ≤Conjoined< The cloth rate is recorded as B3, ≤Conjoined< The distribution rate is recorded as B4, ..., conjoined bodies < The distribution rate is denoted as B n , where B0+B1+B2+B3+B4+……+B n =100%.

[0016] 1) When only monomer is recovered, the calculation method of the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0017] 2) Recycling monomers and ≥ When the conjoined bodies are of the same size, the calculation method of the concentrate index under this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0018] 3) Recycling monomers and ≥ When the conjoined bodies are of the same size, the calculation method of the concentrate index under this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0019] 4) Recycling monomers and ≥ When the conjoined bodies are of the same size, the calculation method of the concentrate index under this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0020] 5) Recycling monomers and ≥ When the conjoined bodies are of the same size, the calculation method of the concentrate index under this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements . ...... 6) Recover all particles containing target minerals. The calculation method of concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0022] Among them, C0 is the constant corresponding to the monomer, C1 is ≤The constant corresponding to the conjoined body<1, C2 is ≤Conjoined< The corresponding constant, C3, is ≤Conjoined< The corresponding constant, C2, is ≤Conjoined< The corresponding constants, ..., C n For conjoined bodies The corresponding constant; where C0=1, , , , … .

[0023] As an optional embodiment, in the method provided by the present invention, n=4, and the monomer distribution rate is recorded as B0, the distribution rate of 3 / 4≤conjoined bodies<1 is recorded as B1, the distribution rate of 2 / 4≤conjoined bodies<3 / 4 is recorded as B2, the distribution rate of 1 / 4≤conjoined bodies<2 / 4 is recorded as B3, and the distribution rate of conjoined bodies<1 / 4 is recorded as B4.

[0024] As an optional embodiment, in the method provided by the present invention, n=4, the constant C0 corresponding to the monomer is 1, and the constant C0 corresponding to 3 / 4≤conjoined body<1 is , the constant corresponding to 2 / 4≤conjoined body<3 / 4 , the constant corresponding to 1 / 4≤conjoined body<2 / 4 , the constant corresponding to the conjoined body <1 / 4 .

[0025] As an optional embodiment, in the method provided by the present invention, n=4, When only monomers are recovered, the calculation method for the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0026] When recovering monomers and ≥3 / 4 of intergrown bodies, the calculation method for the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0027] When recovering monomers and ≥2 / 4 of intergrown bodies, the calculation method for the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0028] When recovering monomers and ≥1 / 4 of intergrown bodies, the calculation method for the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0029] Recover all particles containing target minerals. The calculation method of concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0030] As an optional embodiment, in the method provided by the present invention, in step S4, the method for adjusting the concentrate yield and the recovery rate of the target element includes the following steps: by adjusting the value of the intergrowth distribution rate corresponding to the corresponding data that is closest to the industry standard but less than the industry standard at the fineness, the adjusted value of the intergrowth distribution rate is brought into the calculation method of the target element grade so that the target element grade reaches the industry standard, and accordingly, the adjusted value of the intergrowth distribution rate is brought into the corresponding calculation method of the concentrate yield and the recovery rate of the target element in the concentrate, thereby obtaining a new concentrate yield and the recovery rate of the target element in the concentrate.

[0031] As an optional embodiment, in the method provided by the present invention, in step S1, the method for performing chemical multi-element analysis is titration.

[0032] As an optional embodiment, in the method provided by the present invention, in step S2, the content D of the target element in the target mineral can also refer to the chemical analysis data of the target mineral in the book "Systematic Mineralogy".

[0033] As an optional implementation, in the method provided by the present invention, in step S4, the industry standard refers to the 2011 edition of the Reference Manual of Mineral Resources Industry Requirements published by Geological Publishing House.

[0034] Based on the same technical concept, the present invention also provides the application of the above method for determining the optimal grinding fineness for smelting in the recovery of minerals and smelting products.

[0035] Based on the same technical concept, the present invention also provides a method for efficiently recovering associated fragile beneficial minerals and iron concentrate from primary iron ore, comprising the following steps: (1) After the raw ore is finely ground into a powder sample without sand, representative samples are selected through reduction and chemical multi-element analysis is performed to determine the grade α of the target element in the raw ore.

[0036] (2) Grind the raw ore to different finenesses, make optical slices of samples of different finenesses, and then measure the weight content W of the target mineral to be processed in different samples, the content D of the target element in the target mineral, the particle size and dissociation degree of the target mineral.

[0037] (3) Calculating the technical indicators of the concentrate at the corresponding fineness according to the data obtained in steps S1 and S2, the technical indicators include the concentrate yield , the grade of target element in the concentrate and the recovery rate of the target element .

[0038] (4) Benchmark the concentrate indicators against the industry standards. When the concentrate grades at different finenesses all reach the values ​​of the industry standards, the fineness corresponding to the highest concentrate yield and target element recovery rate under each fineness condition is the optimal grinding fineness. When the concentrate grade at a particular fineness does not reach the value of the industry standard, the concentrate grade value is gradually adjusted to the value of the industry standard, and the concentrate yield and target element recovery rate are adjusted accordingly. After the adjustment, the fineness corresponding to the highest concentrate yield and target element recovery rate under each fineness condition is the optimal grinding fineness.

[0039] (5) The optimum grinding fineness of associated fragile beneficial minerals in primary iron ore and the optimum grinding fineness of magnetite / titanium magnetite in primary iron ore are obtained respectively.

[0040] (6) Grinding the primary iron ore to the optimum grinding fineness for selecting associated fragile beneficial minerals (i.e., the first-stage grinding fineness), and using weak magnetic separation to recover the magnetite / titanium magnetite monomers and part of the rich intergrowths to obtain ultra-pure iron concentrate / iron concentrate and iron tailings.

[0041] (7) The iron tailings obtained in step (6) are used to directly recover the associated fragile beneficial minerals to obtain associated mineral concentrate and iron coarse concentrate.

[0042] (8) Grinding the rough iron concentrate obtained in step (7) to the optimum grinding fineness for selecting magnetite / titanium magnetite (i.e., the second-stage grinding fineness), and recovering the remaining qualified iron concentrate by weak magnetic separation.

[0043] In the present invention, since the associated fragile beneficial minerals are easy to dissociate, and the optimal grinding fineness of the associated fragile beneficial minerals is coarser than the optimal grinding fineness of magnetite / titanium magnetite, most of the ultra-pure iron concentrate / iron concentrate is first recovered at the optimal grinding fineness of the associated beneficial minerals. This step can not only obtain high-grade iron concentrate in advance, but also reduce the influence of iron minerals on subsequent mineral processing effects, while reducing the amount of grinding.

[0044] As an optional embodiment, in the method provided by the present invention, the iron mineral in the native iron ore is selected from one or two of magnetite and titanomagnetite; the associated fragile beneficial minerals in the native iron ore are selected from one or more of ilmenite, chalcopyrite, chalcocite, covellite, bornite, galena, molybdenite, wolframite, scheelite, fluorocarbon cerium or fluorite.

[0045] As an optional embodiment, in the method provided by the present invention, in step (7), the recovery method is a combined magnetic separation-flotation method.

[0046] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention can calculate the concentrate index and the best grinding fineness under various fineness conditions in advance before the ore dressing operation is carried out. The method saves time and labor, is not affected by objective factors such as equipment, reagent system and energy consumption, and has stronger stability, higher adaptability, and saves time and labor.

[0047] (2) The method of utilizing the optimum grinding fineness of associated fragile beneficial minerals in primary iron ore and the optimum grinding fineness of magnetite / titanium magnetite in primary iron ore in the present invention greatly reduces the generation of micron-grade associated fragile beneficial minerals and significantly improves the recovery rate of beneficial elements in the concentrate of associated fragile beneficial minerals; according to the principle of selecting the easier ones first and recovering the more recoverable ones first, ultrapure iron concentrate / iron concentrate is obtained first, while energy consumption and losses are greatly reduced, thereby significantly improving economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A technical diagram for determining the optimal grinding fineness for ore dressing in the present invention; Figure 2 The present invention is a technical diagram of the method for recovering associated fragile beneficial minerals and iron concentrate from primary iron ore. DETAILED DESCRIPTION

[0050] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively and meticulously below in conjunction with the accompanying drawings and preferred embodiments of the present invention, but the protection scope of the present invention is not limited to the following specific embodiments.

[0051] Unless otherwise defined, all the professional terms used below have the same meanings as those generally understood by those skilled in the art. The professional terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the scope of protection of the present invention.

[0052] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in the present invention can be purchased from the market or prepared by existing methods.

[0053] A method for determining the optimal grinding fineness for ore dressing and smelting, the technical route is as follows Figure 1 As shown: The raw ore blocks are finely ground into a powder sample without sand feeling, and then reduced to obtain a representative raw ore sample of about 20g. The chemical multi-element analysis is carried out by titration method to clarify the grade α of the target element in the raw ore.

[0054] The original ore was ground to -200 mesh with finenesses of 35%, 45%, 55%, 65%, 75%, 85% and 95%, and 7 samples were obtained by dividing them into smaller pieces and marking them with identification numbers ①, ②, ③, ④, ⑤, ⑥ and ⑦ respectively.

[0055] The above 7 samples were made into optical slices, and the optical slices numbered ①, ②, ③, ④, ⑤, ⑥ and ⑦ were respectively subjected to determination of mineral type and weight content W, particle size and dissociation degree of target mineral, and content D of target element in target mineral. The mineral type and weight content W were obtained by comprehensive chemical multi-element analysis, X-ray diffraction analysis and MLA determination, the particle size and dissociation degree were obtained by comprehensive microscopic identification and MLA determination, and the content D of target element in target mineral could be obtained by scanning electron microscope energy spectrum micro-area composition analysis, and the chemical analysis data of target mineral in "Systematic Mineralogy" could also be referred to.

[0056] The calculation method of concentrate index is as follows: (1) After the selected representative samples are made into optical slices, the particle size of the target mineral is measured to obtain the proportion of the target mineral with a particle size of more than 800 mesh in the sample, which is recorded as A.

[0057] (2) The conjoined bodies are measured by the n-point method. The calculation method of the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements ; Among them, when n=0, B0 is the distribution rate of the monomer, and C0 is the constant of the monomer corresponding to B0; when n>0, B n is the distribution rate of conjoined bodies, C n For B n The constant corresponding to the conjoined body.

[0058] The specific method includes the following steps: The proportion of the target minerals above 800 mesh in the sample is recorded as A. The representative samples selected above are made into optical slices to detect the dissociation degree of the target minerals in the samples. The conjoined bodies are measured by the n-point method, and the monomer distribution rate is recorded as B0. The distribution rate of ≤ conjoined bodies <1 is recorded as B1, ≤Conjoined< The distribution rate of is denoted as B2, ≤Conjoined< The distribution rate is recorded as B3, ≤Conjoined< The distribution rate is recorded as B4, ..., conjoined bodies < The distribution rate is denoted as B n , where B0+B1+B2+B3+B4+……+B n =100%.

[0059] 1) When only monomer is recovered, the calculation method of the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0060] 2) Recycling monomers and ≥ When the conjoined bodies are of the same size, the calculation method of the concentrate index under this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0061] 3) Recycling monomers and ≥ When the conjoined bodies are of the same size, the calculation method of the concentrate index under this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0062] 4) Recycling monomers and ≥ When the conjoined bodies are of the same size, the calculation method of the concentrate index under this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0063] 5) Recycling monomers and ≥ When the conjoined bodies are of the same size, the calculation method of the concentrate index under this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements . ...... 6) Recover all particles containing target minerals. The calculation method of concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

[0065] Among them, C0 is the constant corresponding to the monomer, C1 is ≤The constant corresponding to the conjoined body<1, C2 is ≤Conjoined< The corresponding constant, C3, is ≤Conjoined< The corresponding constant, C2, is ≤Conjoined< The corresponding constants, ..., C n For conjoined bodies The corresponding constant; where C0=1, , , , … .

[0066] The concentrate indicators are benchmarked against industry standards. When the concentrate grades at different finenesses reach the values ​​of industry standards, the fineness corresponding to the highest concentrate yield and target element recovery rate under various fineness conditions is the optimal grinding fineness; when the concentrate grade at an individual fineness does not reach the value of the industry standard, the concentrate grade value is gradually adjusted to the value of the industry standard, and the concentrate yield and target element recovery rate are adjusted accordingly. After the adjustment, the fineness corresponding to the highest concentrate yield and target element recovery rate under various fineness conditions is the optimal grinding fineness.

[0067] When the grinding fineness exceeds this value, although the degree of dissociation of the target mineral increases, the mineral processing indicators decrease instead of increase.

[0068] The above method is used to obtain the optimal grinding fineness for selecting associated fragile beneficial minerals in primary iron ore and the optimal grinding fineness for selecting magnetite / titanium magnetite in primary iron ore. The primary iron ore is ground to the optimal grinding fineness for selecting associated fragile beneficial minerals, and the magnetite / titanium magnetite monomer and part of the rich intergrowth are recovered by weak magnetic separation to obtain ultra-pure iron concentrate / iron concentrate and iron tailings. The iron tailings are directly used to recover the associated fragile beneficial minerals to obtain associated mineral concentrate and iron rough concentrate. The iron rough concentrate is ground to the optimal grinding fineness for selecting magnetite / titanium magnetite, and the remaining qualified iron concentrate is recovered by weak magnetic separation.

[0069] Example 1 In order to ensure the feasibility of the method for determining the optimal grinding fineness for ore dressing and smelting and the method for efficiently recovering the associated fragile beneficial minerals and iron concentrate in the primary iron ore in this application, taking the vanadium-titanium magnetite ore in a mining area of ​​Panzhihua as an example, the specific steps are as follows: Through laboratory research, it was finally found that the Fe and TiO2 grades α in vanadium-titanium magnetite in a mining area in Panzhihua were 22.60% and 8.26%, the weight contents W of titanomagnetite and ilmenite were 26.81% and 6.85%, the Fe content D in titanomagnetite was 58.94%, the TiO2 content D in ilmenite was 51.82%, the grinding finenesses were -200 mesh 35%, 45%, 55%, 65%, 75%, 85% and 95% respectively, and the corresponding +800 mesh titanomagnetite proportion A under each fineness was 99.48%, 99.33%, 98.78%, 97.94%, 96.45%, 95.99% and 94.03% respectively, and the corresponding +800 mesh ilmenite proportion A under each fineness was 91.48%, 91.33%, 88.21%, 87.09%, 84.54%, 78.59% and 71.26% respectively.

[0070] (ii) Taking the quartering method as an example (n=4), the dissociation degree of ilmenite at different finenesses is shown in Table 1.

[0071] Table 1: Dissociation degree of ilmenite at different grinding finenesses / %

[0072] It can be seen from Table 1 that the dissociation degree of ilmenite at the above different finenesses is relatively low, with the highest monomer being only 67.38%. According to traditional thinking (only focusing on the dissociation degree), the sample still needs to be finely ground.

[0073] According to the method of the present invention, the titanium concentrate indicators under different grinding fineness are calculated, and the specific indicators include the concentrate yield , the grade of target element in the concentrate and target element recovery The calculation method takes the index of titanium concentrate with a fineness of 200 mesh and 35% of vanadium-titanium magnetite in a mining area in Panzhihua as an example: ①Only recover monomers, the indicators of titanium concentrate at -200 mesh 35% fineness: Yield =6.85%×91.48%×27.97%=1.75%; TiO2 Grade =51.82%; TiO2 recovery rate =6.85%×91.48%×51.82%×27.97%÷8.26%=11.00%.

[0074] ② When recovering monomers and ≥3 / 4 conjoined bodies, the indicators of titanium concentrate at -200 mesh and 35% fineness are: Yield =6.85%×91.48%×(27.97%+46.20%×1.1429)=5.06%; TiO2 Grade =51.82%×(27.97%+46.20%)÷(27.97%+46.20%×1.1429)=47.58%; TiO2 recovery rate =6.85%×91.48%×51.82%×(27.97%+46.20%)÷8.26%=29.16%.

[0075] ③ When recovering monomers and ≥1 / 2 conjoined bodies, the indicators of titanium concentrate at -200 mesh and 35% fineness are: Yield =6.85%×91.48%×(27.97%+46.20%×1.1429+12.14%×1.6)=6.28%; TiO2 Grade =51.82%×(27.97%+46.20%+12.14%)÷(27.97%+46.20%×1.1429+12.14%×1.6)=44.64%; TiO2 recovery rate =6.85%×91.48%×51.82%×(27.97%+46.20%+12.14%)÷8.26%=33.93%.

[0076] ④ When recovering monomers and >1 / 4 conjoined bodies, the indicators of titanium concentrate at -200 mesh and 35% fineness are: Yield =6.85%×91.48%×(27.97%+46.20%×1.1429+12.14%×1.6+7.55%×2.667)=7.54%; TiO2 Grade =51.82%×(27.97%+46.20%+12.14%+7.55%)÷(27.97%+46.20%×1.1429+12.14%×1.6+7.55%×2.667)=40.45%; TiO2 recovery rate =6.85%×91.48%×51.82%×(27.97%+46.20%+12.14%+7.55%)÷8.26%=36.93%.

[0077] ⑤ Recover all ilmenite-containing particles, the indicators of titanium concentrate at -200 mesh 35% fineness: Yield =6.85%×91.48%×(27.97%+46.20%×1.1429+12.14%×1.6+7.55%×2.667+6.14%×8)=10.62%; TiO2 Grade =51.82%×100%÷(27.97%+46.20%×1.1429+12.14%×1.6+7.55%×2.667+6.14%×8)=30.58%; TiO2 recovery rate =6.85%×91.48%×51.82%×100%÷8.26%=39.31%.

[0078] Among them, C0 is the constant corresponding to monomer, C0=1; C1 is the constant corresponding to 3 / 4≤conjointly<1, C1=1.1429; C2 is the constant corresponding to 1 / 2≤conjointly<3 / 4, C2=1.6; C3 is the constant corresponding to 1 / 4≤conjointly<1 / 2, C3=2.667; C4 is the constant corresponding to conjointly<1 / 4, C4=8.

[0079] The calculation method of the index of titanium concentrate under other different grinding fineness of vanadium-titanium magnetite in a mining area of ​​Panzhihua is the same as above. The index of titanium concentrate under different grinding fineness is shown in Table 2.

[0080] Table 2: Titanium concentrate indicators at different grinding finenesses

[0081] Comparing the ilmenite concentrate indicators at different finenesses in Table 2 with the industry standard "Ilmenite Concentrate", the titanium concentrate is a fourth-grade product when the TiO2 grade is ≥47%. The concentrate indicators at -200 mesh 35%, 45%, 75%, 85% and 95% grinding fineness have a TiO2 grade of 47%. However, the TiO2 grade of 47% is not found in the concentrate indicators at -200 mesh 55%, 65% and 95% grinding fineness. For the convenience of comparison, the TiO2 grade in the concentrate indicators at -200 mesh 55%, 65% and 95% grinding fineness needs to be adjusted to 47%.

[0082] Specific adjustment method: Adjust the B value of the intergrowth distribution rate corresponding to the data of TiO2 grade closest to 47% but less than 47% under -200 mesh 55%, 65% and 95% grinding fineness, and then bring the adjusted B value into the calculation method of TiO2 grade to make the TiO2 grade reach 47%. Correspondingly, bring the adjusted B value into the calculation method of the corresponding concentrate yield and recovery rate of the target element, so as to obtain the new concentrate yield and recovery rate of the target element.

[0083] In the example, the data of TiO2 grade in the concentrate closest to 47% but less than 47% at -200 mesh 55%, 65% and 95% finenesses correspond to the intergrown bodies of 1 / 2≤intergrown body<3 / 4, 1 / 2≤intergrown body<3 / 4 and 1 / 4≤intergrown body<1 / 2, respectively. The original distribution rate B values ​​of the corresponding intergrown bodies are 8.58%, 8.23% and 2.61%, respectively. The adjusted new distribution rate B values ​​are 2.58%, 6.43% and 1.11%, respectively. The corresponding yields are 5.59%, 5.89% and 5.16%, respectively. The corresponding TiO2 recoveries are 32.20%, 33.72% and 29.69%, respectively.

[0084] When the TiO2 grade is above 47%, the corresponding yields of the concentrate at -200 mesh 35%, 45%, 55%, 65%, 75%, 85% and 95% grinding fineness are 5.06%, 5.18%, 5.59%, 5.89%, 5.88%, 5.49% and 5.16% respectively, and the corresponding TiO2 recoveries are 29.16%, 29.94%, 32.20%, 33.72%, 33.68%, 31.75% and 29.69% respectively.

[0085] When the TiO2 grade is above 47%, with the increase of grinding fineness, the yield of titanium concentrate and its TiO2 recovery rate both show a trend of first increasing and then decreasing. The yield of titanium concentrate is between 5.06% and 5.89%, and the TiO2 recovery rate is between 29.16% and 33.72%.

[0086] When the TiO2 grade reaches above 47%, the yield and TiO2 recovery rate of titanium concentrate at -200 mesh 65% grinding fineness are the highest, which are 5.89% and 33.72% respectively.

[0087] The best grinding fineness for titanium selection is -200 mesh 65%, and the finer the grinding fineness, the lower the index. Therefore, the best grinding fineness for the associated fragile beneficial mineral ilmenite is -200 mesh 65%.

[0088] (III) Taking the quartering method as an example (n=4), the measured values ​​of dissociation degree of titanomagnetite at different grinding finenesses are shown in Table 3.

[0089] Table 3: Dissociation degree of titanomagnetite at different grinding finenesses / %

[0090] With the increase of grinding fineness, the dissociation degree of titanomagnetite increased from 41.41% to 95.35%. The total distribution rate of monomer + rich intergrowth of titanomagnetite at -200 mesh 35%, 45%, 55%, 65%, 75%, 85% and 95% grinding fineness was 80.91%, 81.29%, 87.36%, 91.30%, 94.32%, 96.31% and 97.54% respectively.

[0091] According to the method of the present invention, the iron concentrate indexes under different grinding fineness are calculated, and the specific indexes include the concentrate yield , the grade of target element in the concentrate and target element recovery The calculation method takes the index of iron concentrate with vanadium-titanium magnetite-200 mesh and 95% fineness in a mining area of ​​Panzhihua as an example: ①Only recover monomer, the index of iron concentrate under -200 mesh 95% fineness: Yield =26.81%×94.03%×(95.35%×1)=24.04%; Fe grade =58.94%; Fe recovery rate =26.81%×94.03%×58.94%×95.35%÷22.60%=62.69%.

[0092] ② When recovering monomers and ≥3 / 4 of conjoined bodies, the indicators of iron concentrate at -200 mesh and 95% fineness are: Yield =26.81%×94.03%×(95.35%×1+2.19%×1.1429)=24.67%; Fe grade =58.94%×(95.35%+2.19%)÷(95.35%×1+2.19%×1.1429)=58.75%; Fe recovery rate =26.81%×94.03%×58.94%×(95.35%+2.19%)÷22.60%=64.13%.

[0093] ③ When recovering monomers and ≥1 / 2 conjoined bodies, the indicators of iron concentrate at -200 mesh and 95% fineness are: Yield =26.81%×94.03%×(95.35%×1+2.19%×1.1429+1.29%×1.6)=25.19%; Fe grade =58.94%×(95.35%+2.19%+1.29%)÷(95.35%×1+2.19%×1.1429+1.29%×1.6)=58.30%; Fe recovery rate =26.81%×94.03%×58.94%×(95.35%+2.19%+1.29%)÷22.60%=64.98%.

[0094] ④ When recovering monomers and ≥1 / 4 of conjoined bodies, the indicators of iron concentrate at -200 mesh and 95% fineness are: Yield =26.81%×94.03%×(95.35%×1+2.19%×1.1429+1.29%×1.6+0.43%×2.667)=25.48%; Fe grade =58.94%×(95.35%+2.19%+1.29%+0.43%)÷(95.35%×1+2.19%×1.1429+1.29%×1.6+0.43%×2.667)=57.89%; Fe recovery rate =26.81%×94.03%×58.94%×(95.35%+2.19%+1.29%+0.43%)÷22.60%=65.26%.

[0095] ⑤ Recover all the particles containing titanium magnetite, the index of iron concentrate at -200 mesh 95% fineness: Yield =26.81%×94.03%×(95.35%×1+2.19%×1.1429+1.29%×1.6+0.43%×2.667+0.74%×8)=26.97%; Fe grade =51.82%×100%÷(95.35%×1+2.19%×1.1429+1.29%×1.6+0.43%×2.667+0.74%×8)=55.09%; Fe recovery rate =26.81%×94.03%×58.94%×100%÷22.60%=65.75%.

[0096] Among them, C0 is the constant corresponding to monomer, C0=1; C1 is the constant corresponding to 3 / 4≤conjointly<1, C1=1.1429; C2 is the constant corresponding to 1 / 2≤conjointly<3 / 4, C2=1.6; C3 is the constant corresponding to 1 / 4≤conjointly<1 / 2, C3=2.667; C4 is the constant corresponding to conjointly<1 / 4, C4=8.

[0097] The calculation method of the index of iron concentrate under other different grinding fineness of vanadium-titanium magnetite in a mining area of ​​Panzhihua is the same as above. The index of iron concentrate under different grinding fineness is shown in Table 4.

[0098] Table 4: Iron concentrate indicators at different grinding finenesses

[0099] According to the national standard "Classification of Iron Ore Product Grades", when the iron ore product is a concentrate mainly composed of vanadium-titanium magnetite, the TFe grade in the fourth grade of iron ore concentrate is between 52% and 57%. For the convenience of comparison, this patent is based on the Fe grade of 57%.

[0100] In the concentrate indicators in Table 4 above, the benchmark Fe grade of 57% is not found in the concentrate indicators at -200 mesh 35%, 45% and 75% grinding fineness. For the convenience of comparison, the Fe grade in the concentrate indicators at these grinding finenesses needs to be adjusted to 57%.

[0101] Specific adjustment method: adjust the B value of the intergrowth distribution rate corresponding to the data with Fe grade closest to 57% but less than 57% under -200 mesh 35%, 45% and 75% grinding fineness, and then bring the adjusted B value into the calculation method of Fe grade to make the Fe grade reach 57%. Correspondingly, bring the adjusted B value into the calculation method of the corresponding concentrate yield and target element recovery rate, so as to obtain the new concentrate yield and target element recovery rate.

[0102] In the example, the data with Fe grades in the concentrate closest to 57% but less than 57% at -200 mesh fineness of 35%, 45% and 75% correspond to the intergrowths of 3 / 4≤intergrowth<1, 3 / 4≤intergrowth<1 and 1 / 2≤intergrowth<3 / 4, respectively. The original distribution rate B values ​​of the corresponding intergrowths are 39.50%, 23.46% and 3.18%, respectively. The adjusted new distribution rate B values ​​are 8.50%, 12.46% and 2.18%, respectively. The corresponding yields are 13.64%, 19.19% and 25.68%, respectively. The corresponding Fe recoveries are 34.72%, 48.82% and 65.08%, respectively.

[0103] When the Fe grade is 57%, the corresponding yields of the concentrate at -200 mesh 35%, 45%, 55%, 65%, 75%, 85% and 95% grinding fineness are 13.64%, 19.19%, 23.92%, 24.59%, 25.68%, 26.19% and 25.48%, respectively, and the corresponding Fe recoveries are 34.72%, 48.82%, 60.34%, 62.52%, 65.08%, 66.62% and 65.26%, respectively.

[0104] When the Fe grade is closest to 57%, with the increase of grinding fineness, the yield of iron ore concentrate and its Fe recovery rate both show a trend of first increasing and then decreasing. The yield of iron ore concentrate is between 13.64% and 26.19%, and the Fe recovery rate is between 34.72% and 66.62%.

[0105] When the Fe grade is 57%, the yield and Fe recovery rate of iron ore concentrate at -200 mesh 85% grinding fineness are the highest, which are 26.19% and 66.62% respectively.

[0106] The best grinding fineness for iron selection is -200 mesh 85%, and the finer the grinding fineness, the lower the index. Therefore, the best grinding fineness for titanium magnetite is -200 mesh 85%.

[0107] (iv) Grinding the raw ore to -200 mesh 65%, using weak magnetic separation to recover the monomers and rich intergrowths of titanomagnetite, and obtaining iron concentrate and iron tailings, wherein the iron concentrate indicators are: yield 24.59%, iron grade 57.46%, and iron recovery rate 62.52%.

[0108] (V) The tailings of iron ore are effectively recovered into ilmenite and iron concentrate by a weak magnetic-flotation method. The indicators of flotation titanium concentrate are: yield 5.89%, TiO2 grade 47.26%, TiO2 recovery rate 33.72%.

[0109] (vi) Finally, the iron ore concentrate was ground to the optimum grinding fineness of -200 mesh for titanomagnetite, 85%, and the remaining magnetite was recovered by adjusting the weak magnetic separation parameters to obtain an iron concentrate with an iron grade of 57%. The corresponding yield and iron recovery rate were 1.60% and 3.95%, respectively.

[0110] Example 2 In order to ensure the feasibility of the method for determining the optimal grinding fineness for ore dressing and the method for efficiently recovering the associated fragile beneficial minerals and iron concentrate in the primary iron ore in this application, taking a copper-containing and sulfur-containing primary iron ore in Peru as an example, the specific steps are as follows: (I) Through laboratory research, it was finally found that the contents of recoverable elements TFe, Cu and S in a certain copper-sulfur primary iron ore in Peru were 43.54%, 0.11% and 2.15% respectively, the weight contents W of magnetite and chalcopyrite were 55.61% and 0.13% respectively, and the contents D of TFe and Cu in magnetite and chalcopyrite were 72.40% and 34.56% respectively. The proportion A of +800 mesh magnetite at -200 mesh 60%, 70% and 80% fineness was 98.49%, 98.19% and 97.93% respectively, and the proportion A of +800 mesh chalcopyrite at -200 mesh 60%, 70% and 80% fineness was 88.98%, 82.13% and 77.32% respectively. The raw ore samples of -200 mesh 60%, 70% and 80% fineness were provided by colleagues in mineral processing.

[0111] (ii) Taking the quartering method as an example (n=4), the dissociation degrees of magnetite and chalcopyrite at different finenesses are shown in Table 5.

[0112] Table 5: Dissociation degree of magnetite and chalcopyrite at different grinding finenesses / %

[0113] According to the method of the present invention, the copper concentrate indicators under different grinding fineness are calculated, and the specific indicators include the concentrate yield , the grade of target element in the concentrate and target element recovery The calculation method takes the copper concentrate index of a copper-sulfur-containing primary iron ore in Peru with a fineness of 200 mesh and 60% as an example: ①Only recover the monomer, the index of copper concentrate at -200 mesh 60% fineness: Yield =0.13%×88.98%×(26.08%×1)=0.03%; Cu Grade =34.56%; Cu recovery rate =0.13%×88.98%×34.56%×26.08%÷0.11%=9.48%.

[0114] ② When recovering monomers and ≥3 / 4 of conjoined bodies, the indicators of copper concentrate at -200 mesh and 60% fineness are: Yield =0.13%×88.98%×(26.08%×1+16.73%×1.1429)=0.05%; Cu Grade =34.56%×(26.08%+16.73%)÷(26.08%×1+16.73%×1.1429)=32.73%; Cu recovery rate =0.13%×88.98%×34.56%×(26.08%+16.73%)÷0.11%=15.56%.

[0115] ③ When recovering monomers and ≥1 / 2 conjoined bodies, the indicators of copper concentrate at -200 mesh and 60% fineness are: Yield =0.13%×88.98%×(26.08%×1+16.73%×1.1429+26.54%×1.6)=0.10%; Cu Grade =34.56%×(26.08%+16.73%+26.54%)÷(26.08%×1+16.73%×1.1429+26.54%×1.6)=27.34%; Cu recovery rate =0.13%×88.98%×34.56%×(26.08%+16.73%+26.54%)÷0.11%=25.20%.

[0116] ④ When recovering monomers and ≥1 / 4 of conjoined bodies, the indicators of copper concentrate at -200 mesh and 60% fineness are: Yield =0.13%×88.98%×(26.08%×1+16.73%×1.1429+26.54%×1.6+13.14%×2.667)=0.14%; Cu Grade =34.56%×(26.08%+16.73%+26.54%+13.14%)÷(26.08%×1+16.73%×1.1429+26.54%×1.6+13.14%×2.667)=23.23%; Cu recovery rate =0.13%×88.98%×34.56%×(26.08%+16.73%+26.54%+13.14%)÷0.11%=29.98%.

[0117] ⑤ Recover all particles containing chalcopyrite, the indicators of copper concentrate at -200 mesh 60% fineness: Yield =0.13%×88.98%×(26.08%×1+16.73%×1.1429+26.54%×1.6+13.14%×2.667+17.51%×8)=0.30%; Cu Grade =34.56%×100%÷(26.08%×1+16.73%×1.1429+26.54%×1.6+13.14%×2.667+17.51%×8)=13.15%; Cu recovery rate =0.13%×88.98%×34.56%×100%÷0.11%=36.54%.

[0118] Among them, C0 is the constant corresponding to monomer, C0=1; C1 is the constant corresponding to 3 / 4≤conjointly<1, C1=1.1429; C2 is the constant corresponding to 1 / 2≤conjointly<3 / 4, C2=1.6; C3 is the constant corresponding to 1 / 4≤conjointly<1 / 2, C3=2.667; C4 is the constant corresponding to conjointly<1 / 4, C4=8.

[0119] The calculation method of the copper concentrate index under other different grinding fineness of a certain copper-containing and sulfur-containing primary iron ore in Peru is the same as above. The copper concentrate index under different grinding fineness is shown in Table 6.

[0120] Table 6: Copper concentrate indicators at different grinding finenesses

[0121] By comparing the copper concentrate indicators at different finenesses in Table 6 with the industry standard of copper concentrate, when the copper grade reaches 18%, the copper concentrate is a fourth-grade product. However, the Cu grade of 18% is not found in the concentrate indicators at -200 mesh 60%, 70% and 80% grinding fineness. For the convenience of comparison, the Cu grade in the concentrate indicators at -200 mesh 60%, 70% and 80% grinding fineness needs to be adjusted to 18%.

[0122] Specific adjustment method: adjust the B value of the intergrowth distribution rate corresponding to the data with Cu grade closest to 18% but less than 18% under -200 mesh 60%, 70% and 80% grinding fineness, and then bring the adjusted B value into the calculation method of copper grade to make the Cu grade reach 18%. Correspondingly, bring the adjusted B value into the calculation method of the corresponding concentrate yield and target element recovery rate, so as to obtain the new concentrate yield and target element recovery rate.

[0123] In the example, the data with Cu grade in the concentrate closest to 18% but less than 18% at -200 mesh 60%, 70% and 80% fineness are all conjoined bodies corresponding to conjoined bodies <1 / 4, and the original distribution rates B corresponding to conjoined bodies <1 / 4 are 17.51%, 13.21% and 12.16% respectively. The new distribution rates B of conjoined bodies <1 / 4 after adjustment are 7.99%, 9.89% and 10.16% respectively, and the corresponding yields are 0.22%, 0.20% and 0.19% respectively, and the corresponding copper recoveries are 32.88%, 32.43% and 30.95% respectively. When the copper grade reaches 18%, the yield and copper recovery of copper concentrate at -200 mesh 60% fineness are higher than those at other finenesses, so the best grinding fineness of chalcopyrite is -200 mesh 60%.

[0124] (III) Calculate the iron concentrate indexes at different grinding finenesses according to the method of the present invention, including the concentrate yield , the grade of target element in the concentrate and target element recovery The calculation method takes the index of iron concentrate with 80% fineness of 200 mesh of a copper-sulfur-containing primary iron ore in Peru as an example: ①Only recover monomers, the indicators of iron concentrate at -200 mesh 80% fineness: Yield =55.61%×97.93%×(69.17%×1)=37.67%; Fe grade =72.40%; Fe recovery rate =55.61%×97.93%×72.40%×69.17%÷43.54%=62.64%.

[0125] ② When recovering monomers and ≥3 / 4 of conjoined bodies, the indicators of iron concentrate at -200 mesh 80% fineness are: Yield =55.61%×97.93%×(69.17%×1+23.86%×1.1429)=52.52%; Fe grade =72.40%×(69.17%+23.86%)÷(69.17%×1+23.86%×1.1429)=69.84%; Fe recovery rate =55.61%×97.93%×72.40%×(69.17%+23.86%)÷43.54%=84.24%.

[0126] ③ When recovering monomers and ≥1 / 2 conjoined bodies, the indicators of iron concentrate at -200 mesh 80% fineness are: Yield =55.61%×97.93%×(69.17%×1+23.86%×1.1429+5.11%×1.6)=56.97%; Fe grade =72.40%×(69.17%×1+23.86%+5.11%)÷(69.17%×1+23.86%×1.1429+5.11%×1.6)=67.92%; Fe recovery rate =55.61%×97.93%×72.40%×(69.17%+23.86%+5.11%)÷43.54%=88.87%.

[0127] ④ When recovering monomers and ≥1 / 4 of conjoined bodies, the indicators of iron concentrate at -200 mesh 80% fineness are: Yield =55.61%×97.93%×(69.17%×1+23.86%×1.1429+5.11%×1.6+1.35%×2.667)=58.93%; Fe grade =72.40%×(69.17%+23.86%+5.11%+1.35%)÷(69.17%×1+23.86%×1.1429+5.11%×1.6+1.35%×2.667)=66.56%; Fe recovery rate =55.61%×97.93%×72.40%×(69.17%+23.86%+5.11%+1.35%)÷43.53%=90.09%.

[0128] ⑤ Recover all particles containing magnetite, the index of iron concentrate at -200 mesh 80% fineness: Yield =55.61%×97.93%×(69.17%×1+23.86%×1.1429+5.11%×1.6+1.35%×2.667+0.51%×8)=61.16%; Fe grade =72.40%×100%÷(69.17%×1+23.86%×1.1429+5.11%×1.6+1.35%×2.667+0.51%×8)=64.47%; Fe recovery rate =55.61%×97.93%×72.40%×100%÷43.53%=90.56%.

[0129] Among them, C0 is the constant corresponding to monomer, C0=1; C1 is the constant corresponding to 3 / 4≤conjointly<1, C1=1.1429; C2 is the constant corresponding to 1 / 2≤conjointly<3 / 4, C2=1.6; C3 is the constant corresponding to 1 / 4≤conjointly<1 / 2, C3=2.667; C4 is the constant corresponding to conjointly<1 / 4, C4=8.

[0130] The calculation method of the index of iron concentrate under different grinding fineness of a copper-containing and sulfur-containing primary iron ore in Peru is the same as above. The index of iron concentrate under different grinding fineness is shown in Table 7.

[0131] Table 7: Iron concentrate indicators at different grinding finenesses

[0132] By comparing the iron concentrate indicators at different finenesses in Table 7 with the industry standard for iron concentrates, "Classification of Iron Ore Product Grades" (GB / T32545-2016), when the iron grade reaches 67%, the iron concentrate is a first-class product. However, the iron grade of 67% is not found in the concentrate indicators at a grinding fineness of -200 mesh and 60%. For the convenience of comparison, the iron grade in the concentrate indicators at a grinding fineness of -200 mesh and 60% needs to be adjusted to 67%.

[0133] Specific adjustment method: Adjust the B value of the intergrowth distribution rate corresponding to the data with an iron grade closest to 67% but less than 67% under -200 mesh 60% grinding fineness, and then bring the adjusted B value into the calculation method of the iron grade to make the iron grade reach 67%. Correspondingly, bring the adjusted B value into the calculation method of the corresponding concentrate yield and target element recovery rate, so as to obtain the new concentrate yield and target element recovery rate.

[0134] In the example, the data with the iron grade in the concentrate closest to 67% but less than 67% at -200 mesh 60% fineness corresponds to 1 / 2≤ intergrowth <3 / 4, and the original distribution rate B corresponding to 1 / 2≤ intergrowth <3 / 4 is 8.81%. After adjustment, the new distribution rate B of 1 / 2≤ intergrowth <3 / 4 is 2.11%, the corresponding yield is 52.87%, and the corresponding iron recovery rate is 82.01%. When the iron grade reaches 67%, the yield and iron recovery rate of iron concentrate at -200 mesh 80% fineness are higher than other finenesses, so -200 mesh 80% is selected as the best grinding fineness for magnetite.

[0135] (IV) The raw ore is ground to -200 mesh 60%, and weak magnetic separation is used to recover the monomer of magnetite and 42.39% of rich intergrowths to obtain ultra-pure iron concentrate and iron-separated tailings. The ultra-pure iron concentrate has the following indicators: yield 37.87%, iron grade 70.09%, and iron recovery rate 60.97%. Since magnetite-rich intergrowths composed of magnetite and metal sulfide are relatively rare, the sulfur content in the ultra-pure iron concentrate does not exceed the standard.

[0136] The principle for determining the recovery of 42.39% of rich intergrowths is as follows: by adjusting the data with an iron grade closest to 70% but less than 70% at -200 mesh and 60% fineness to correspond to 3 / 4≤intergrowth<1, the original distribution rate B of 3 / 4≤intergrowth<1 is 36.45%, and the new distribution rate B of 3 / 4≤intergrowth<1 after adjustment is 15.45%. Then the new distribution rate B divided by the original distribution rate B is the proportion of rich intergrowths that need to be recovered.

[0137] (V) The iron tailings are effectively recovered by weak magnetic-flotation combined method to recover chalcopyrite and iron rough concentrate, and the metal sulfides mainly composed of pyrite are discarded. The flotation copper concentrate indicators are: yield 0.22%, copper grade 18.52%, copper recovery rate 32.88%. Due to the introduction of a certain amount of black copper ore in the form of conjoined bodies, the copper recovery rate in the final copper concentrate will be slightly higher than the calculated indicators.

[0138] (VI) Finally, the rough iron concentrate is ground to the optimum grinding fineness of magnetite - 200 mesh 80%, and the remaining magnetite is recovered by adjusting the weak magnetic separation parameters to obtain a first-class iron concentrate with an iron grade of more than 67%. The corresponding yield and iron recovery rate are 19.84% and 28.36%, respectively.

[0139] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the scope of protection of the present invention.

Claims

1. A method for determining the optimal grinding fineness for ore dressing, characterized in that: The following steps are involved: S1. Grind the raw ore into a powder sample without sand feeling, select representative samples by reduction, and conduct chemical multi-element analysis to determine the grade α of the target element in the raw ore; S2. Grind the raw ore to different finenesses, make optical slices of samples of different finenesses, and then measure the weight content W of the target mineral to be processed, the content D of the target element in the target mineral, the particle size and dissociation degree of the target mineral in different samples; S3, calculating the technical indicators of the concentrate at the corresponding fineness according to the data obtained in steps S1 and S2, the technical indicators including the concentrate yield , the grade of target element in the concentrate and the recovery rate of the target element ; S4. Benchmark the concentrate indicators against the industry standards. When the concentrate grades at different finenesses all reach the values ​​of the industry standards, the fineness corresponding to the highest concentrate yield and target element recovery rate under each fineness condition is the optimal grinding fineness. When the concentrate grade at an individual fineness does not reach the value of the industry standard, gradually adjust the concentrate grade value to the value of the industry standard, and adjust the concentrate yield and target element recovery rate accordingly. After the adjustment, the fineness corresponding to the highest concentrate yield and target element recovery rate under each fineness condition is the optimal grinding fineness.

2. The method for determining the optimal grinding fineness for ore dressing according to claim 1, characterized in that: The calculation method of the concentrate index comprises the following steps: (1) After the selected representative sample is made into an optical slice, the particle size of the target mineral is measured to obtain the proportion of the target mineral with a particle size of more than 800 mesh in the sample, which is recorded as A; (2) The conjoined bodies are measured by the n-point method. The calculation method of the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements ; Among them, when n=0, B0 is the distribution rate of the monomer, and C0 is the constant of the monomer corresponding to B0; when n>0, B n is the distribution rate of conjoined bodies, C n For B n The constant corresponding to the conjoined body.

3. The method for determining the optimal grinding fineness for ore dressing according to claim 1, characterized in that: When n=4, the monomer distribution rate is recorded as B0, the distribution rate of 3 / 4≤conjoined bodies<1 is recorded as B1, the distribution rate of 2 / 4≤conjoined bodies<3 / 4 is recorded as B2, the distribution rate of 1 / 4≤conjoined bodies<2 / 4 is recorded as B3, and the distribution rate of <1 / 4 is recorded as B4.

4. The method for determining the optimal grinding fineness for ore dressing according to claim 1, characterized in that: n=4, the constant corresponding to the monomer C0=1, the constant corresponding to 3 / 4≤conjoined<1 , the constant corresponding to 2 / 4≤conjoined body<3 / 4 , the constant corresponding to 1 / 4≤conjoined body<2 / 4 , the constant corresponding to the conjoined body <1 / 4 .

5. The method for determining the optimal grinding fineness for ore dressing according to claim 1, characterized in that: n=4， When only monomers are recovered, the calculation method for the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements ; When recovering monomers and ≥3 / 4 of intergrown bodies, the calculation method for the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements ; When recovering monomers and ≥2 / 4 of intergrown bodies, the calculation method for the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements ; When recovering monomers and ≥1 / 4 of intergrown bodies, the calculation method for the concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements ; Recover all particles containing target minerals. The calculation method of concentrate index at this fineness is: Yield ; The quality of the target element ; Recovery rate of target elements .

6. The method for determining the optimal grinding fineness for ore dressing and smelting according to claim 1, characterized in that: In step S4, the method for adjusting the concentrate yield and the recovery rate of the target element includes the following steps: by adjusting the value of the intergrowth distribution rate corresponding to the corresponding data that is closest to the industry standard but less than the industry standard at the fineness, the adjusted value of the intergrowth distribution rate is brought into the calculation method of the target element grade so that the target element grade reaches the industry standard, and correspondingly the adjusted value of the intergrowth distribution rate is brought into the corresponding calculation method of the concentrate yield and the recovery rate of the target element in the concentrate, so as to obtain a new concentrate yield and the recovery rate of the target element in the concentrate.

7. Application of the method for determining the optimal grinding fineness for ore dressing as described in any one of claims 1 to 6 in the recovery of minerals and ore dressing products.

8. A method for efficiently recovering associated fragile beneficial minerals and iron concentrate from primary iron ore, characterized in that: The following steps are involved: (1) Grind the raw ore into a powder sample without sand, select representative samples by reduction, and conduct chemical multi-element analysis to determine the grade α of the target element in the raw ore; (2) Grind the raw ore to different finenesses, make optical slices of samples of different finenesses, and then measure the weight content W of the target mineral to be processed, the content D of the target element in the target mineral, the particle size and dissociation degree of the target mineral in different samples; (3) Calculating the technical indicators of the concentrate at the corresponding fineness according to the data obtained in steps S1 and S2, the technical indicators include the concentrate yield , the grade of target element in the concentrate and the recovery rate of the target element ; (4) Benchmarking the concentrate indicators against the industry standards. When the concentrate grades at different finenesses all reach the values ​​of the industry standards, the fineness corresponding to the highest concentrate yield and target element recovery rate under each fineness condition is the optimal grinding fineness. When the concentrate grade at a particular fineness does not reach the value of the industry standard, the concentrate grade value is gradually adjusted to the value of the industry standard, and the concentrate yield and target element recovery rate are adjusted accordingly. After the adjustment, the fineness corresponding to the highest concentrate yield and target element recovery rate under each fineness condition is the optimal grinding fineness. (5) respectively obtaining the optimum grinding fineness of associated fragile beneficial minerals in primary iron ore and the optimum grinding fineness of magnetite / titanium magnetite in primary iron ore; (6) Grinding the primary iron ore to the optimal grinding fineness for selecting associated fragile beneficial minerals, and using weak magnetic separation to recover magnetite / titanium magnetite monomers and part of rich intergrowths to obtain ultra-pure iron concentrate / iron concentrate and iron tailings; (7) directly recovering the associated fragile beneficial minerals from the iron ore tailings obtained in step (6) to obtain associated mineral concentrate and iron coarse concentrate; (8) Grinding the rough iron concentrate obtained in step (7) to an optimum grinding fineness for selecting magnetite / titanium magnetite, and recovering the remaining qualified iron concentrate by weak magnetic separation.

9. The method for efficiently recovering associated fragile beneficial minerals and iron concentrate from primary iron ore according to claim 8, characterized in that: The iron minerals in the primary iron ore are selected from one or two of magnetite and titanomagnetite; the associated fragile beneficial minerals in the primary iron ore are selected from one or more of ilmenite, chalcopyrite, chalcocite, covellite, bornite, galena, molybdenite, wolframite, scheelite, fluorocarbon cerium or fluorite.

10. The method for efficiently recovering associated fragile beneficial minerals and iron concentrate from primary iron ore according to claim 8, characterized in that: In step (7), the recovery method is a combined magnetic separation-flotation method.

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