Crushing and pre-selecting process for mud-containing maghematite mixed ore

Abstract

The invention discloses a crushing and pre-selecting process for mud-containing maghematite mixed ore, and belongs to the technical field of ore dressing. The technological process of three-section two-closed-circuit crushing, pre-ore washing and grading, dry-type pre-concentration tailing discarding and high-pressure roller semi-open-circuit wet-type tailing discarding is adopted, coarse and intermediate crushed products are subjected to pre-ore washing and grading through a double-layer ore washing sieve, the graded products are subjected to fine crushing and weak magnetic-strong magnetic dry-type pre-concentration, and weak magnetic concentrate and strong magnetic concentrate are obtained; the strong magnetic block concentrates are sold as final block concentrates; and the strong magnetic dry-type pre-selected tailings are subjected to strong magnetic scavenging discarding, and strong magnetic middlings and strong magnetic scavenging block tailings are obtained. And performing high-pressure roller closed-circuit or semi-open-circuit ultrafine crushing on the weak magnetic concentrate and the strong magnetic middling, performing wet weak magnetic and strong magnetic composite magnetic separation tailings discarding on an ultrafine crushing product, feeding the composite magnetic separation concentrate into a grinding separation process, and screening the composite magnetic separation tailings to obtain coarse sand and fine tailings. According to the invention, the concepts of'collecting and early collecting ', 'throwing and early throwing', 'throwing and early throwing 'and the like are fully realized, and the efficient crushing and pre-selection of the mud-containing magnetic hematite mixed ore is realized.

Description

Technical Field

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

[0002] As a mineral resource with important potential value, muddy maghemite mixed ore contains both magnetite and hematite, and also contains a large amount of mud. The existing pre-selection processes for single magnetite or high-mud hematite cannot effectively meet the processing needs of muddy maghemite mixed ore. Due to the large mud content and high water content of muddy maghemite mixed ore, the hopper, crusher and screen will be blocked during the crushing and pre-selection process, which reduces the crushing efficiency and screening efficiency, and also seriously affects the sorting effect, resulting in unstable concentrate grade and low recovery rate. Summary of the invention

[0003] The purpose of the present invention is to provide a crushing and pre-selection process for mud-containing magnetic mixed ore to solve the problems in the existing crushing and pre-selection of mud-containing magnetic mixed ore in the above-mentioned 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 maghemitic mixed ore, comprising the following steps:

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

[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 discarding;

[0012] S7: the -3 mm 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 mill product obtained in S8 to obtain two particle size products of +3 mm and -3 mm;

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

[0016] S11: The -3mm particle size products obtained from 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 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 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 discarding.

[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 maghemitic mixed ore of the present invention is to pre-wash and classify the muddy maghemitic 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 clogging the crushing system.

[0026] 2. The crushing and pre-selection process of muddy magmatic mixed ore of the present invention is to carry out weak magnetic-strong magnetic dry pre-selection-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 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, the high-pressure roller and the weak magnetic and strong magnetic composite ore separator 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 entering the mill, reduces the amount entering the mill, and reduces the energy consumption of the grinding and selection operation.

[0028] 4. The crushing and pre-selection process of muddy magmatic 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 crushing and pre-selection process of the muddy magnetic hematite mixed ore of the present invention efficiently integrates the processes of pre-washing and grading, lump ore pre-selection, 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 when possible", "early discard when possible", "early discard when possible", etc., which not only improves the grade of entering the mill, but also reduces the energy consumption of the grinding and selection operation. In the crushing and pre-selection operation, the present invention can obtain lump concentrate, 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

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

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

[0034] S2: Screening and grading the coarsely crushed product obtained in step S1 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 graded through a double-layer ore washing screen to obtain products of three particle sizes: +40mm, -40+3mm, and -3mm;

[0037] S5: finely crush the +40 mm particle size product obtained in step S4, and return the finely crushed product 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-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, and the lump tailings are scavenged and stored for comprehensive utilization;

[0039] S7: the -3 mm 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 discarding;

[0041] S9: Screen and grade the high pressure roller mill product obtained in S8 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 +3 mm particle size product obtained in S9 to S8 for high pressure roller grinding;

[0043] S11: The -3mm particle size products obtained from 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;

[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 firstly washes and grades the muddy maghemitic mixed ore under coarse and medium crushing conditions (0-75mm) using a double-layer ore washing screen to pre-wash and grade the ore, so as to avoid the water-containing powder 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 "early collection if possible" and "early discard if 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 dressing 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 crushing and pre-selection process of muddy magma mixed ore provided by the embodiment of the present invention 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 flow, and the coarse and medium crushed products (0-75mm) are pre-washed and graded by a double-layer ore washing screen, and the graded products are +40mm, -40+3mm, and -3mm three particle sizes, +40mm particle size is finely crushed, -40+3mm is subjected to weak magnetic-strong magnetic dry pre-selection to obtain block concentrate, and the strong magnetic dry pre-selection tailings are subjected to strong magnetic sweeping and tailings discarding to obtain strong magnetic medium ore and strong magnetic sweeping block tailings. The weak magnetic concentrate and the strong magnetic medium ore are subjected to high-pressure roller closed-circuit or semi-open-circuit wet tailings discarding, the composite magnetic separation concentrate enters the grinding and selection process, and 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 pre-selection, 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 pre-selection of mud-containing magnetic hematite mixed ore.

[0050] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A crushing and pre-selection process for mixed ore containing mud and hematite, characterized in that: The following steps are involved: S1: Coarse crushing of the ore from the mine; S2: Screen and grade the coarsely crushed product obtained in S1 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 discarding; S7: the -3 mm 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 mill product obtained in S8 to obtain two particle size products of +3 mm and -3 mm; S10: returning the +3 mm particle size product obtained in S9 to S8 for high pressure roller grinding; S11: The -3mm particle size products obtained from 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: 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 maghemitic mixed ore according to claim 1, characterized in that: The strong magnetic dry pre-selected concentrate in S6 is a lump concentrate, and the obtained weak magnetic concentrate enters step S8, where the block tails are swept and stored for comprehensive utilization.

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

5. A crushing and pre-selection process for muddy maghemitic mixed ore according to claim 1, characterized in that: The high pressure roller 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 discarding.

6. A crushing and pre-selection process for muddy maghemitic 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 utilized as resources.

7. A crushing and pre-selection process for muddy maghemitic 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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