A crushing and grinding process to reduce tungsten over-crushing and save energy

Abstract

The present invention discloses a crushing and grinding process for reducing tungsten over-crushing and energy conservation, comprising the following steps: S01: After the crushed ore is introduced into a high-pressure roller mill, the particle size of the crushed product is controlled to -3mm; S02: Then, grinding and grading operations are performed, with the ground ore product reaching 70% of -200 mesh, and the distribution of tungsten metal in the intermediate selectable particle size increases. The present invention achieves "more crushing and less grinding" by controlling the feed particle size of the ball mill to -3mm. In one grinding step, the fineness of the ground ore product is ensured to be 70% of -200 mesh. The distribution of tungsten metal in the intermediate selectable particle size increases, with the -800 mesh metal distribution accounting for 52%, a year-on-year decrease of 13.33%. The degree of tungsten over-crushing is significantly reduced, while the energy consumption of the crushing and grinding system is reduced by 30%. The crushed ore can be dispersed and its activity increased through treatment with a pretreatment liquid.

Description

Technical Field

[0001] The invention relates to the technical field of tungsten crushing and grinding, and in particular to a crushing and grinding process for reducing over-crushing of tungsten and saving energy. Background Art

[0002] A 3,000 t / d tungsten polymetallic ore concentrator has a 0.32% WO3 grade. The primary crushing process uses a feed size of 800 mm or less. A classic three-stage, closed-circuit crushing process is used to achieve a crushed product particle size of -12 mm. A two-stage, two-closed-circuit grinding process is then used to achieve a final grinding product particle size of -200 mesh, representing 70% of the product. This allows for the separation of tungsten and other associated metals. The main concentrator process consists of magnetic deironing, molybdenum, bismuth, and sulfur flotation, room-temperature mixed flotation of black and white tungsten, and fluorite flotation. The resulting tungsten concentrate has a 40% WO3 grade and a 70% recovery rate.

[0003] Tungsten ore is brittle and easily over-crushed during the grinding process. Screening tests revealed that the distribution of tungsten metal in the grinding product was -800 mesh, reaching 60%, and that the tailings of the floating tungsten tailings were also mainly concentrated in the -800 mesh size, accounting for nearly 60%. This shows that over-crushed tungsten in the fine particle size is a key factor restricting tungsten recovery. In addition, the grinding operation consumes a lot of energy. After a three-stage one-closed-circuit crushing and two-stage two-closed-circuit grinding process, tungsten is severely over-crushed, and the tailings are mainly concentrated in the -800 mesh fine particle size, making it difficult to further improve the tungsten recovery rate; the two-stage grinding operation consumes a lot of energy. Summary of the Invention

[0004] In view of the defects of the prior art, the purpose of the present invention is to provide a crushing and grinding process that reduces over-crushing of tungsten and saves energy, so as to solve the problems raised in the above background technology.

[0005] The present invention solves the technical problem by adopting the following technical solutions:

[0006] The present invention provides a crushing and grinding process for reducing over-crushing of tungsten and saving energy, comprising the following steps:

[0007] S01: After the crushed ore is introduced into the high pressure roller grinding mill, the particle size of the crushed product is controlled at -3mm;

[0008] S02: Then the grinding and classification operation is carried out. The grinding products reach -200 mesh, accounting for 70%. The distribution of the intermediate optional particle size of tungsten metal in the grinding products increases, while the fine particle size of -800 mesh decreases to 50%. The over-crushing of tungsten is significantly reduced. At the same time, the energy consumption of the crushing and grinding system is reduced by 32%;

[0009] The specific process of crushing and grinding ore in high pressure roller grinding mill is as follows:

[0010] S01: Place the crushed ore in 3-5 times the pretreatment liquid and stir to disperse it thoroughly, then wash and dry;

[0011] S02: Preparation of modification solution;

[0012] S03: Place the crushed ore pre-treated in S01 into 3-5 times the modified liquid, stir thoroughly, wash with water, dry, and then crush in a high-pressure roller mill.

[0013] Preferably, the pretreatment solution comprises the following raw materials in parts by weight:

[0014] 10-20 parts of sodium lauryl sulfate, 5-10 parts of silane coupling agent KH560, 1-3 parts of phosphate buffer solution and 20-25 parts of deionized water.

[0015] Preferably, the pH value of the phosphate buffer solution is 5.5.

[0016] Preferably, the preparation method of the modified liquid is:

[0017] S11: adding hydrochloric acid solution to sodium alginate solution at a weight ratio of 1:5, and then adding modified hydroxyapatite at 5-10% of the total amount of hydrochloric acid solution, and stirring evenly;

[0018] S12: adding chitosan to the lanthanum sulfate solution at a weight ratio of 1:5, and then adding sodium alkyl sulfonate, stirring thoroughly to obtain an additive;

[0019] S13: Add the additives to S11 in a weight ratio of 1:3 and stir thoroughly to obtain a modified solution.

[0020] Preferably, the mass fractions of the hydrochloric acid solution and the sodium alginate solution are 5-10% and 10-15% respectively.

[0021] Preferably, the mass fraction of the lanthanum sulfate solution is 10-15%.

[0022] Preferably, the mass fraction of the lanthanum sulfate solution is 12.5%.

[0023] Preferably, the modification method of the modified hydroxyapatite is:

[0024] The hydroxyapatite is placed at 110-120° C. for heat treatment for 5-10 minutes, then cooled to 55-65° C. at a rate of 3-5° C. / min, stirred and dispersed evenly in deionized water, and finally washed with water and dried to obtain the modified hydroxyapatite.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The present invention realizes "more crushing and less grinding" and controls the feed particle size fed into the ball mill at -3 mm. One-stage grinding can ensure that the fineness of the grinding product is -200 mesh, accounting for 70%. The distribution of tungsten metal in the grinding product is increased in the middle optional particle size, and the -800 mesh metal distribution accounts for 52%, which decreases by 13.33% year-on-year. The degree of tungsten over-crushing is significantly reduced. At the same time, the energy consumption of the crushing and grinding system is reduced by 30%. The crushed ore can be dispersed and the activity is improved through pretreatment liquid treatment. Due to the preparation of raw materials such as sodium lauryl sulfate and silane coupling agent KH560, the interface between the crushed ores is improved, which is beneficial to subsequent grinding. The modification effect is optimized by combining hydrochloric acid solution, sodium alginate solution and the like in the modifying liquid. The activity of hydroxyapatite is enhanced after treatment, and the tungsten ore can be coated in the modifying liquid, thereby optimizing the crushing and grinding process, avoiding excessive damage, improving the over-crushing phenomenon, and improving the recovery rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] A crushing and grinding process for reducing tungsten over-crushing and saving energy in this embodiment includes the following steps:

[0030] S01: After the crushed ore is introduced into the high pressure roller grinding mill, the particle size of the crushed product is controlled at -3mm;

[0031] S02: Then the grinding and classification operation is carried out. The grinding products reach -200 mesh, accounting for 70%. The distribution of the intermediate optional particle size of tungsten metal in the grinding products increases, while the fine particle size of -800 mesh decreases to 50%. The over-crushing of tungsten is significantly reduced. At the same time, the energy consumption of the crushing and grinding system is reduced by 32%;

[0032] The specific process of crushing and grinding ore in high pressure roller grinding mill is as follows:

[0033] S01: Place the crushed ore in 3-5 times the pretreatment liquid and stir to disperse it thoroughly, then wash and dry;

[0034] S02: Preparation of modification solution;

[0035] S03: Place the crushed ore pre-treated in S01 into 3-5 times the modified liquid, stir thoroughly, wash with water, dry, and then crush in a high-pressure roller mill.

[0036] The pretreatment solution of this embodiment includes the following raw materials in parts by weight:

[0037] 10-20 parts of sodium lauryl sulfate, 5-10 parts of silane coupling agent KH560, 1-3 parts of phosphate buffer solution and 20-25 parts of deionized water.

[0038] The pH value of the phosphate buffer solution in this example is 5.5.

[0039] The preparation method of the modified liquid of this embodiment is:

[0040] S11: adding hydrochloric acid solution to sodium alginate solution at a weight ratio of 1:5, and then adding modified hydroxyapatite at 5-10% of the total amount of hydrochloric acid solution, and stirring evenly;

[0041] S12: adding chitosan to the lanthanum sulfate solution at a weight ratio of 1:5, and then adding sodium alkyl sulfonate, stirring thoroughly to obtain an additive;

[0042] S13: Add the additives to S11 in a weight ratio of 1:3 and stir thoroughly to obtain a modified solution.

[0043] The mass fractions of the hydrochloric acid solution and the sodium alginate solution in this embodiment are 5-10% and 10-15% respectively.

[0044] The mass fraction of the lanthanum sulfate solution in this embodiment is 10-15%.

[0045] The mass fraction of the lanthanum sulfate solution in this embodiment is 12.5%.

[0046] The modification method of the modified hydroxyapatite in this embodiment is:

[0047] The hydroxyapatite is placed at 110-120° C. for heat treatment for 5-10 minutes, then cooled to 55-65° C. at a rate of 3-5° C. / min, stirred and dispersed evenly in deionized water, and finally washed with water and dried to obtain the modified hydroxyapatite.

[0048] Example 1:

[0049] A crushing and grinding process for reducing tungsten over-crushing and saving energy in this embodiment includes the following steps:

[0050] S01: After the crushed ore is introduced into the high pressure roller grinding mill, the particle size of the crushed product is controlled at -3mm;

[0051] S02: Then the grinding and classification operation is carried out. The grinding products reach -200 mesh, accounting for 70%. The distribution of the intermediate optional particle size of tungsten metal in the grinding products increases, while the fine particle size of -800 mesh decreases to 50%. The over-crushing of tungsten is significantly reduced. At the same time, the energy consumption of the crushing and grinding system is reduced by 32%;

[0052] The specific process of crushing and grinding ore in high pressure roller grinding mill is as follows:

[0053] S01: Place the crushed ore in 3 times the pretreatment liquid and stir to disperse it thoroughly, then wash and dry;

[0054] S02: Preparation of modification solution;

[0055] S03: Place the crushed ore pre-treated in S01 into 3 times the modified liquid, stir thoroughly, wash with water, dry, and then crush in a high-pressure roller mill.

[0056] The pretreatment solution of this embodiment includes the following raw materials in parts by weight:

[0057] 10 parts of sodium lauryl sulfate, 5 parts of silane coupling agent KH560, 1 part of phosphate buffer solution and 20 parts of deionized water.

[0058] The pH value of the phosphate buffer solution in this example is 5.5.

[0059] The preparation method of the modified liquid of this embodiment is:

[0060] S11: adding hydrochloric acid solution to sodium alginate solution at a weight ratio of 1:5, and then adding modified hydroxyapatite at 5% of the total amount of hydrochloric acid solution, and stirring evenly;

[0061] S12: adding chitosan to the lanthanum sulfate solution at a weight ratio of 1:5, and then adding sodium alkyl sulfonate, stirring thoroughly to obtain an additive;

[0062] S13: Add the additives to S11 in a weight ratio of 1:3 and stir thoroughly to obtain a modified solution.

[0063] The mass fractions of the hydrochloric acid solution and the sodium alginate solution in this embodiment are 5% and 10-15% respectively.

[0064] The mass fraction of the lanthanum sulfate solution in this embodiment is 10%.

[0065] The modification method of the modified hydroxyapatite in this embodiment is:

[0066] The hydroxyapatite was heat-treated at 110° C. for 5 minutes, then cooled to 55° C. at a rate of 3° C. / min, stirred and dispersed uniformly in deionized water, and finally washed with water and dried to obtain modified hydroxyapatite.

[0067] Example 2:

[0068] A crushing and grinding process for reducing tungsten over-crushing and saving energy in this embodiment includes the following steps:

[0069] S01: After the crushed ore is introduced into the high pressure roller grinding mill, the particle size of the crushed product is controlled at -3mm;

[0070] S02: Then the grinding and classification operation is carried out. The grinding products reach -200 mesh, accounting for 70%. The distribution of the intermediate optional particle size of tungsten metal in the grinding products increases, while the fine particle size of -800 mesh decreases to 50%. The over-crushing of tungsten is significantly reduced. At the same time, the energy consumption of the crushing and grinding system is reduced by 32%;

[0071] The specific process of crushing and grinding ore in high pressure roller grinding mill is as follows:

[0072] S01: Place the crushed ore in 5 times the pretreatment liquid and stir to disperse it thoroughly, then wash and dry;

[0073] S02: Preparation of modification solution;

[0074] S03: Place the crushed ore pre-treated in S01 into 5 times the modified liquid, stir thoroughly, wash with water, dry, and then crush in a high-pressure roller mill.

[0075] The pretreatment solution of this embodiment includes the following raw materials in parts by weight:

[0076] 20 parts of sodium lauryl sulfate, 10 parts of silane coupling agent KH560, 3 parts of phosphate buffer solution and 25 parts of deionized water.

[0077] The pH value of the phosphate buffer solution in this example is 5.5.

[0078] The preparation method of the modified liquid of this embodiment is:

[0079] S11: adding hydrochloric acid solution to sodium alginate solution at a weight ratio of 1:5, and then adding modified hydroxyapatite at 10% of the total amount of hydrochloric acid solution, and stirring evenly;

[0080] S12: adding chitosan to the lanthanum sulfate solution at a weight ratio of 1:5, and then adding sodium alkyl sulfonate, stirring thoroughly to obtain an additive;

[0081] S13: Add the additives to S11 in a weight ratio of 1:3 and stir thoroughly to obtain a modified solution.

[0082] The mass fractions of the hydrochloric acid solution and the sodium alginate solution in this embodiment are 10% and 10-15% respectively.

[0083] The mass fraction of the lanthanum sulfate solution in this embodiment is 15%.

[0084] The modification method of the modified hydroxyapatite in this embodiment is:

[0085] The hydroxyapatite was heat-treated at 120° C. for 10 minutes, then cooled to 65° C. at a rate of 5° C. / min, stirred and dispersed uniformly in deionized water, and finally washed with water and dried to obtain modified hydroxyapatite.

[0086] Example 3:

[0087] A crushing and grinding process for reducing tungsten over-crushing and saving energy in this embodiment includes the following steps:

[0088] S01: After the crushed ore is introduced into the high pressure roller grinding mill, the particle size of the crushed product is controlled at -3mm;

[0089] S02: Then the grinding and classification operation is carried out. The grinding products reach -200 mesh, accounting for 70%. The distribution of the intermediate optional particle size of tungsten metal in the grinding products increases, while the fine particle size of -800 mesh decreases to 50%. The over-crushing of tungsten is significantly reduced. At the same time, the energy consumption of the crushing and grinding system is reduced by 32%;

[0090] The specific process of crushing and grinding ore in high pressure roller grinding mill is as follows:

[0091] S01: Place the crushed ore in 4 times the pretreatment liquid and stir to disperse it thoroughly, then wash and dry;

[0092] S02: Preparation of modification solution;

[0093] S03: Place the crushed ore pre-treated in S01 into 4 times the modified liquid, stir thoroughly, wash with water, dry, and then crush in a high-pressure roller mill.

[0094] The pretreatment solution of this embodiment includes the following raw materials in parts by weight:

[0095] 15 parts of sodium lauryl sulfate, 7.5 parts of silane coupling agent KH560, 2 parts of phosphate buffer solution and 22.5 parts of deionized water.

[0096] The pH value of the phosphate buffer solution in this example is 5.5.

[0097] The preparation method of the modified liquid of this embodiment is:

[0098] S11: adding hydrochloric acid solution to sodium alginate solution at a weight ratio of 1:5, and then adding modified hydroxyapatite at 7.5% of the total amount of hydrochloric acid solution, and stirring evenly;

[0099] S12: adding chitosan to the lanthanum sulfate solution at a weight ratio of 1:5, and then adding sodium alkyl sulfonate, stirring thoroughly to obtain an additive;

[0100] S13: Add the additives to S11 in a weight ratio of 1:3 and stir thoroughly to obtain a modified solution.

[0101] The mass fractions of the hydrochloric acid solution and the sodium alginate solution in this embodiment are 5-10% and 12.5% ​​respectively.

[0102] The mass fraction of the lanthanum sulfate solution in this embodiment is 12.5%.

[0103] The modification method of the modified hydroxyapatite in this embodiment is:

[0104] The hydroxyapatite was heat-treated at 115° C. for 7.5 min, then cooled to 60° C. at a rate of 4° C. / min, stirred and dispersed uniformly in deionized water, and finally washed with water and dried to obtain modified hydroxyapatite.

[0105] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced therein.

[0106] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A crushing and grinding process for reducing tungsten over-crushing and saving energy, characterized in that: The following steps are involved: S01: After the crushed ore is introduced into the high pressure roller grinding mill, the particle size of the crushed product is controlled at -3mm; S02: Then the grinding and classification operation is carried out. The grinding products reach -200 mesh, accounting for 70%. The distribution of the intermediate optional particle size of tungsten metal in the grinding products increases, while the fine particle size of -800 mesh decreases to 50%. The over-crushing of tungsten is significantly reduced. At the same time, the energy consumption of the crushing and grinding system is reduced by 32%; The specific process of crushing and grinding ore in high pressure roller grinding mill is as follows: S01: Place the crushed ore in 3-5 times the pretreatment liquid and stir to disperse it thoroughly, then wash and dry; S02: Preparation of modification solution; S03: Place the crushed ore pre-treated in S01 into 3-5 times the modified liquid, stir thoroughly, wash with water, dry, and then crush in a high pressure roller mill; The pretreatment solution comprises the following raw materials in parts by weight: 10-20 parts of sodium lauryl sulfate, 5-10 parts of silane coupling agent KH560, 1-3 parts of phosphate buffer solution and 20-25 parts of deionized water; The pH value of the phosphate buffer solution is 5.5; The preparation method of the modified liquid is: S11: adding hydrochloric acid solution to sodium alginate solution at a weight ratio of 1:5, and then adding modified hydroxyapatite at 5-10% of the total amount of hydrochloric acid solution, and stirring evenly; S12: adding chitosan to the lanthanum sulfate solution at a weight ratio of 1:5, and then adding sodium alkyl sulfonate, stirring thoroughly to obtain an additive; S13: Add the additives to S11 in a weight ratio of 1:3 and stir thoroughly to obtain a modified solution.

2. A crushing and grinding process for reducing tungsten over-crushing and saving energy according to claim 1, characterized in that: The mass fractions of the hydrochloric acid solution and the sodium alginate solution are 5-10% and 10-15% respectively.

3. A crushing and grinding process for reducing tungsten over-crushing and saving energy according to claim 1, characterized in that: The mass fraction of the lanthanum sulfate solution is 10-15%.

4. A crushing and grinding process for reducing tungsten over-crushing and saving energy according to claim 3, characterized in that: The mass fraction of the lanthanum sulfate solution is 12.5%.

5. The crushing and grinding process for reducing tungsten over-crushing and saving energy according to claim 1, characterized in that: The modification method of the modified hydroxyapatite is: The hydroxyapatite is placed at 110-120° C. for heat treatment for 5-10 minutes, then cooled to 55-65° C. at a rate of 3-5° C. / min, stirred and dispersed evenly in deionized water, and finally washed with water and dried to obtain the modified hydroxyapatite.

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