A crushing and pre-selection process for muddy magma mixed ore

Abstract

The present invention discloses a crushing and preselection process for mixed magma containing mud, belonging to the field of mineral processing technology. The process adopts a three-stage, two-closed-circuit crushing-pre-washing and grading-dry pre-selection and tailings discarding-high-pressure roller semi-open-circuit wet tailings discarding process. The coarse and medium crushed products are pre-washed and graded using a double-layer ore washing screen. The graded products are subjected to fine crushing and weak magnetic-strong magnetic dry preselection to obtain weak magnetic concentrate and strong magnetic concentrate. The strong magnetic block concentrate is sold as the final block concentrate. The strong magnetic dry preselection tailings are subjected to strong magnetic scavenging and tailings discarding to obtain strong magnetic middlings and strong magnetic scavenging block tailings. The weak magnetic concentrate and strong magnetic middlings are subjected to ultra-fine crushing by high-pressure roller closed-circuit or semi-open-circuit. The ultra-fine crushed products are subjected to wet weak magnetic and strong magnetic composite magnetic separation and tailings discarding. The composite magnetic separation concentrate enters the grinding process. The composite magnetic separation tailings are screened to obtain coarse sand and fine tailings. The present invention fully realizes the concepts of "early collection when possible", "early disposal when possible", and "early disposal when possible", and achieves efficient crushing and preselection of mixed magma containing mud.

Description

Technical Field

[0001] The invention relates to the technical field of ore dressing, in particular to a crushing and pre-selection process for mud-containing magma mixed ore. Background Art

[0002] Muddy maghemite mixed ore, a mineral resource with significant potential, contains both magnetite and hematite, along with a significant amount of mud. Existing pre-selection processes for single magnetite or high-mud hematite ores are unable to effectively address the processing needs of muddy maghemite mixed ore. Due to the high mud content and moisture content, muddy maghemite mixed ore can cause blockage in the hopper, crusher, and screen during the crushing and pre-selection process, reducing crushing and screening efficiency and severely impacting separation results, resulting in unstable concentrate grade and low recovery. Summary of the Invention

[0003] The purpose of the present invention is to provide a crushing and preselection process for mud-containing magnetic mixed ore to solve the problems existing in the crushing and preselection of mud-containing magnetic mixed ore in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A crushing and pre-selection process for muddy magma mixed ore, comprising the following steps:

[0006] S1: Coarse crushing of the ore from the stope;

[0007] S2: The coarsely crushed product obtained in S1 is screened and graded to obtain products of two particle sizes: -250+75mm and -75+0mm;

[0008] S3: The -250+75mm particle size product obtained in S2 is subjected to secondary crushing, and the secondary crushed product is returned to S2 for screening and grading;

[0009] S4: The -75+0mm particle size product obtained in S2 is pre-washed and graded through a double-layer ore washing screen to obtain products of three particle sizes: +40mm, -40+3mm, and -3mm;

[0010] S5: The +40mm particle size product obtained in S4 is finely crushed, and the finely crushed product is returned to S4 for washing and classification;

[0011] S6: The -40+3mm particle size product obtained in S4 is subjected to weak magnetic-strong magnetic dry pre-selection-strong magnetic tail sweeping and tailing removal;

[0012] S7: The -3mm particle size product obtained in S4 is subjected to step S11;

[0013] S8: subjecting the weak magnetic concentrate obtained in S4 and the strong magnetic middlings obtained in S6 to high pressure roller grinding;

[0014] S9: Screening and grading the high-pressure roller grinding product obtained in S8 to obtain two particle size products of +3 mm and -3 mm;

[0015] S10: returning the +3mm particle size product obtained in S9 to S8 for high pressure roller grinding;

[0016] S11: The -3mm particle size products obtained in S4 and S9 and the products after high pressure roller grinding are subjected to weak magnetic and strong magnetic composite wet tailings disposal. The concentrate enters the grinding operation, and the tailings proceed to the next step S12;

[0017] S12: The tailings obtained in S11 are screened and graded to obtain two products: coarse sand and fine tailings.

[0018] Furthermore, the strong magnetic dry pre-selected concentrate in S6 is a lump concentrate, and the obtained weak magnetic concentrate enters step S8 to sweep and select the lump tailings for storage and comprehensive utilization.

[0019] Furthermore, in S9, the edge material of the high pressure roller grinding mill can be taken out and returned to S8 to form a semi-open circuit process.

[0020] Furthermore, the coarsely crushed products in S2 are pre-washed and graded using a double-layer washing screen.

[0021] Furthermore, the high pressure roller grinding mill in S8 and the weak magnetic and strong magnetic composite concentrator in S11 form a high pressure roller closed circuit or semi-open circuit wet tailings throwing.

[0022] Furthermore, in S11, the tailings are screened and graded after weak magnetic and strong magnetic composite dressing, and both coarse sand and fine tailings products can be utilized as resources.

[0023] Furthermore, a three-stage two-closed-circuit crushing - pre-washing and classification - weak magnetic and strong magnetic dry pre-selection and tailings discarding - high-pressure roller semi-open circuit composite wet tailings discarding process is adopted.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The crushing and preselection process of the muddy maghemite mixed ore of the present invention is to pre-wash and classify the muddy maghemite mixed ore under coarse and medium crushing particle size conditions (0-75mm) using a double-layer ore washing screen, so as to avoid the water-containing powder ore from clogging the crushing system.

[0026] 2. The crushing and pre-selection process of muddy magma mixed ore of the present invention is to carry out weak magnetic-strong magnetic dry pre-selection and strong magnetic tailing sweeping and discarding of the intermediate ore products (-40+3mm) after pre-washing and classification, so as to obtain lump concentrate and discard the lump tailing, thereby improving the grade of the ore entering the mill and realizing the concept of "early collection if possible" and "early discard if possible".

[0027] 3. The crushing and pre-selection process of muddy magnetic hematite mixed ore of the present invention, wherein the high-pressure roller and the weak magnetic and strong magnetic composite concentrator form a high-pressure roller closed-circuit or semi-open-circuit wet tailings discarding, not only reduces the particle size of the material entering the mill, but also improves the grade of the material entering the mill, reduces the amount of material entering the mill, and reduces the energy consumption of the grinding and selection operation.

[0028] 4. The crushing and pre-selection process of muddy magma mixed ore of the present invention screens and grades the weak magnetic and strong magnetic composite beneficiation tailings to obtain two products, coarse sand and fine tailings, both of which can be utilized as resources.

[0029] 5. The present invention's crushing and pre-selection process for muddy magma mixed ore efficiently integrates pre-washing and grading, lump ore pre-selection, strong magnetic tailings discarding, and high-pressure roller closed-circuit or semi-open-circuit wet composite tailings discarding. This fully implements the concepts of "early collection when possible," "early discard when possible," and "early discard when possible," thereby improving the mill grade and reducing energy consumption during the grinding and pre-selection process. During the crushing and pre-selection process, the present invention can produce both lump concentrate and lump tailings, coarse sand, and fine tailings for comprehensive utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a process flow chart of the present invention. DETAILED DESCRIPTION

[0031] 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.

[0032] like Figure 1 As shown, a crushing and pre-selection process for muddy magma mixed ore provided in an embodiment of the present invention includes the following steps:

[0033] S1: Coarse crushing of the ore from the stope;

[0034] S2: The coarsely crushed product obtained in step S1 is screened and graded to obtain products of two particle sizes: -250+75mm and -75+0mm;

[0035] S3: The -250+75mm particle size product obtained in step S2 is subjected to secondary crushing, and the secondary crushed product is subjected to step S2;

[0036] S4: The -75+0mm particle size product obtained in step S2 is pre-washed and classified through a double-layer ore washing screen to obtain products of three particle sizes: +40mm, -40+3mm, and -3mm;

[0037] S5: The +40mm particle size product obtained in step S4 is finely crushed, and the finely crushed product is returned to step S4 for washing and classification;

[0038] S6: The -40+3mm particle size product obtained in step S4 is subjected to weak magnetic-strong magnetic dry pre-selection and strong magnetic tailing scavenging and discarding. The strong magnetic dry pre-selection concentrate is a lump concentrate, and the obtained weak magnetic concentrate is subjected to step S8, where the tailings are scavenged and stored for comprehensive utilization;

[0039] S7: The -3mm particle size product obtained in S4 is subjected to step S11;

[0040] S8: The weak magnetic concentrate obtained in S4 and the strong magnetic middlings obtained in S6 are subjected to high pressure roller grinding; the high pressure roller grinding in S8 and the weak magnetic and strong magnetic composite concentrator in S11 form a high pressure roller closed circuit or semi-open circuit wet tailings throwing;

[0041] S9: The high pressure roller milled product obtained in S8 is screened and graded to obtain two particle size products of +3mm and -3mm. The edge material of the high pressure roller mill can also be returned to S8 to form a semi-open circuit process.

[0042] S10: returning the +3mm particle size product obtained in S9 to S8 for high pressure roller grinding;

[0043] S11: The -3mm particle size products obtained in S4 and S9 and the products after high-pressure roller grinding are subjected to weak magnetic and strong magnetic composite wet tailings disposal. The concentrate enters the grinding operation and the tailings are sent to the next step;

[0044] S12: The tailings obtained in S11 are screened and graded to obtain two products: coarse sand and fine tailings.

[0045] In the above embodiment: the present invention first pre-washes and grades the muddy magma mixed ore under coarse and medium crushing conditions (0-75mm) using a double-layer ore washing screen, which can avoid the water-containing powdered ore from clogging the crushing system.

[0046] Secondly, the intermediate ore products (-40+3mm) after pre-washing and classification of the present invention are subjected to weak magnetic-strong magnetic dry pre-selection-strong magnetic tailing sweeping and discarding, which can not only obtain lump concentrate, but also discard the lump tailings, improve the grade entering the mill, and realize the concept of "collect as early as possible" and "discard as early as possible".

[0047] Again, the high-pressure roller mill in the embodiment of the present invention and the weak magnetic and strong magnetic composite ore concentrator form a high-pressure roller closed-circuit or semi-open-circuit wet tailings discarding, which not only reduces the particle size of the material entering the mill, but also improves the grade of the material entering the mill, reduces the amount of material entering the mill, and reduces the energy consumption of the grinding and selection operation.

[0048] In addition, the weak magnetic and strong magnetic composite beneficiation tailings of the present invention are screened and graded to obtain two products, coarse sand and fine tailings, and both the coarse sand and the fine tailings can be utilized as resources.

[0049] In summary: The embodiment of the present invention provides a crushing and pre-selection process for muddy magma mixed ore, which adopts a three-stage two-closed-circuit crushing-pre-washing and grading-dry pre-selection and tailings discarding-high-pressure roller closed-circuit or semi-open-circuit wet tailings discarding process. The coarse and medium crushed products (0-75mm) are pre-washed and graded using a double-layer ore washing screen. The graded products are +40mm, -40+3mm, and -3mm. The +40mm particle size is finely crushed, and the -40+3mm is subjected to weak magnetic-strong magnetic dry pre-selection to obtain lump concentrate. The strong magnetic dry pre-selection tailings are subjected to strong magnetic scavenging and tailings discarding to obtain strong magnetic medium ore and strong magnetic scavenging block tailings. The weak magnetic concentrate and strong magnetic medium ore are subjected to high-pressure roller closed-circuit or semi-open-circuit wet tailings discarding, and the composite magnetic separation concentrate enters the grinding process. The composite magnetic separation tailings are screened to obtain coarse sand and fine tailings. The present invention efficiently integrates the processes of pre-washing and grading, lump ore preselection, strong magnetic tailings discarding, high-pressure roller closed-circuit or semi-open-circuit wet composite tailings discarding, etc., fully realizing the concepts of "early collection if possible", "early disposal if possible", and "early disposal if possible", and achieving efficient crushing and preselection of mud-containing magnetic mixed ore.

[0050] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A crushing and pre-selection process for mixed ore containing mud and red iron, characterized in that: The following steps are involved: S1: Coarse crushing of the ore from the stope; S2: The coarsely crushed product obtained in S1 is screened and graded to obtain products of two particle sizes: -250+75mm and -75+0mm; S3: The -250+75mm particle size product obtained in S2 is subjected to secondary crushing, and the secondary crushed product is returned to S2 for screening and grading; S4: The -75+0mm particle size product obtained in S2 is pre-washed and graded through a double-layer ore washing screen to obtain products of three particle sizes: +40mm, -40+3mm, and -3mm; S5: The +40mm particle size product obtained in S4 is finely crushed, and the finely crushed product is returned to S4 for washing and classification; S6: The -40+3mm particle size product obtained in S4 is subjected to weak magnetic-strong magnetic dry pre-selection-strong magnetic tail sweeping and tailing removal; S7: The -3mm particle size product obtained in S4 is subjected to step S11; S8: subjecting the weak magnetic concentrate obtained in S4 and the strong magnetic middlings obtained in S6 to high pressure roller grinding; S9: Screening and grading the high-pressure roller grinding product obtained in S8 to obtain two particle size products of +3 mm and -3 mm; S10: returning the +3mm particle size product obtained in S9 to S8 for high pressure roller grinding; S11: The -3mm particle size products obtained in S4 and S9 and the products after high-pressure roller grinding are subjected to weak magnetic and strong magnetic composite wet tailings disposal. The concentrate enters the grinding operation and the tailings are sent to the next step; S12: The tailings obtained in S11 are screened and graded to obtain two products: coarse sand and fine tailings.

2. A crushing and pre-selection process for muddy magma mixed ore according to claim 1, characterized in that: The strong magnetic dry pre-selected concentrate in step S6 is a lump concentrate, and the obtained weak magnetic concentrate enters step S8, where the lump tails are swept and stored for comprehensive utilization.

3. The crushing and pre-selection process for muddy magma mixed ore according to claim 1, characterized in that: In S9, the edge material of the high pressure roller mill can be taken out and returned to S8 to form a semi-open circuit process.

4. The crushing and pre-selection process for muddy magma mixed ore according to claim 1, characterized in that: The coarse crushed products in S2 are pre-washed and graded using a double-layer washing screen.

5. The crushing and pre-selection process for muddy magma mixed ore according to claim 1, characterized in that: The high pressure roller grinding mill in S8 and the weak magnetic and strong magnetic composite concentrator in S11 form a high pressure roller closed circuit or semi-open circuit wet tailings throwing system.

6. A crushing and pre-selection process for muddy magma mixed ore according to claim 2, characterized in that: In S11, the tailings are screened and graded after weak magnetic and strong magnetic composite dressing, and both coarse sand and fine tailings products can be used as resources.

7. The crushing and pre-selection process for muddy magma mixed ore according to claim 1, characterized in that: The process flow is three-stage two-closed circuit crushing - pre-washing and classification - dry pre-selection and tailings discarding - high-pressure roller semi-open circuit composite wet tailings discarding.

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