CN104437827B - Specularite dust ore dressing technology - Google Patents

Specularite dust ore dressing technology Download PDF

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Publication number
CN104437827B
CN104437827B CN201410467518.6A CN201410467518A CN104437827B CN 104437827 B CN104437827 B CN 104437827B CN 201410467518 A CN201410467518 A CN 201410467518A CN 104437827 B CN104437827 B CN 104437827B
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ring
grade
response rate
cyclone
ore
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CN104437827A (en
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李国洲
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MCC North Dalian Engineering Technology Co Ltd
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MCC North Dalian Engineering Technology Co Ltd
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B7/00Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03BSEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B1/00Conditioning for facilitating separation by altering physical properties of the matter to be treated

Abstract

The invention belongs to the technical field of ore dressing and particularly relates to a specularite dust ore dressing technology. The specularite dust ore dressing technology is characterized by comprising an ore grinding and grading system and a magnetic separation and dressing system. The grade of input raw ore is 33%, and the granularity is 0-15 mm. The specularite dust ore dressing technology comprises specific steps that firstly, specularite dust ore passes through two segments of continuous closed circuits for grinding until specularite is dissociated from gangue monomers, wherein the ball mill-cyclone-fine screen closed circuit is adopted for each segment of ore grinding; the products of which the grading size is 0.074 mm, the grade is 33% and the productivity is 100% in the two segments of closed circuits for grinding are fed into a medium-intensity magnetic separator, a roughing vertical-ring high-intensity magnetic separator, a concentration vertical-ring high-intensity magnetic separator, a roughing flat-ring high-intensity magnetic separator, a concentration vertical-ring high-intensity magnetic separator and two segments of scavenging flat-ring high-intensity magnetic separators for magnetic separation. The grade of final iron ore concentrate can be improved to 50%-52%, and the recovery rate can be increased to 70%-72%. Accordingly, economic benefits of a dressing plant are greatly increased, and the loss of iron resources is lowered.

Description

A kind of speculum iron fine ore sorting process
Technical field
The invention belongs to iron ore dressing technical field, particularly a kind of speculum iron fine ore sorting process.
Background technology
China Gansu the Jiayu Pass area is contained abundant spiegel Ore, and this area's Ore industrial type is mainly speculum iron Stone, speculum iron siderite mixed ore and speculum iron limonite mixed ore.Speculum iron and limonite are one kind of bloodstone, tool There is weak magnetic, be directly selected in, need higher field intensity could be sorted out with the method for magnetic separation.For sorting speculum iron, lead to The method reducing the degree of oxidation of iron in ore mineral frequently with reduction roasting to increase the magnetic of speculum iron, and then uses low intensity magnetic separation Method sorting speculum iron, the concentrate grade of speculum iron can be brought up to 60% about by this method, and the response rate can reach 80%.But the fine ore hole of the 0-15mm after being crushed due to speculum iron few it is impossible to be used for reduction roasting, so this part spiegel Ore deposit mostly processes as barren rock and is not selected in, even if the grade being selected in final iron ore concentrate also only has 45%-47%, the response rate is generally below 60%, grade is low, and the response rate is low, deficiency in economic performance.It is necessary that developing one kind effectively can be selected to 0-15mm speculum iron fine ore Not, improve a kind of speculum iron fine ore sorting process of final iron concentrate grade and the response rate.
Content of the invention
It is an object of the invention to provide one kind effectively can be sorted to speculum iron fine ore, can the final iron ore concentrate of larger raising Grade and the response rate, increase a kind of speculum iron fine ore sorting process selecting factory's benefit.
The purpose of the present invention is realized by following technical proposals:
The present invention'sOneKind of speculum iron fine ore sorting process it is characterised in that:Sort including grinding classification system and magnetic separation System, enters to grind head grade 33%, and granularity is 0-15mm, comprises the following steps that:
A, speculum iron fine ore first pass through two sections of continuous closed circuit grindings and are directly ground to speculum iron and stone-like pulse monomer dissociation;Every section of mill Ore deposit is all closed circuit using ball milling-cyclone-dusting cover, and the grading sifter partition size in two sections of closed circuit grindings is 0.074mm;
One section of cyclone overflow fineness during first paragraph ball milling-cyclone-dusting cover I is closed circuit is -0.074mm content 55%- 60%, one section of cyclone overflow feeds one section of dusting cover I, and one section of dusting cover I yield is that 40% oversize feeds second segment ball milling-rotation The closed circuit cyclone of stream device-dusting cover II;
Two-stage nitration cyclone overflow fineness during second segment ball milling-cyclone-dusting cover II is closed circuit is -0.074mm content 75%- 80%, two-stage nitration cyclone overflow feeds two-stage nitration dusting cover II, and two-stage nitration dusting cover II yield is 23% oversize return second segment eddy flow Device, one section of dusting cover undersize of -0.074mm and two-stage nitration dusting cover II undersize merge into grade 33%, the product of yield 100% Product feed the middle magnetic separator that magnetic separation sorts system;
B, grade 32.7%, the middle magnetic separator mine tailing of the response rate 98% feeds roughly selects the strong magnetomechanical of vertical ring;
C, grade 26%, the mine tailing roughly selecting the strong magnetomechanical of vertical ring of the response rate 57% feeds thickness grading cyclone;Thickness grading The P80=60 micron of cyclone, the underflow coarse fraction product of the response rate 18% feeds two sections and continuously scans the strong magnetomechanical of vertical ring;Thickness is divided The P80=28 micron of level cyclone, the overflow fine fraction product of the response rate 39% feeds roughly selects the strong magnetomechanical of flat ring;
D, grade 40%, the concentrate roughly selecting the strong magnetomechanical of flat ring of the response rate 12% feeds the strong magnetomechanical of selected vertical ring, grade 32%, The mine tailing of the strong magnetomechanical of selected vertical ring of the response rate 8% returns and roughly selects Horizontal ring high intensity magnetic separator, grade 25%, and roughly selecting of the response rate 35% is flat The mine tailing of the strong magnetomechanical of ring feeds two sections and continuously scans the strong magnetomechanical of flat ring;
E, grade are 42%, one section of the response rate 27% scan the strong magnetomechanical of flat ring and two-stage nitration scans the comprehensive essence of the strong magnetomechanical of flat ring Ore deposit returns to the strong magnetomechanical of selected vertical ring;
F, grade be 53%, the middle magnetic separator concentrate of the response rate 2%, grade be 52%, the response rate 41% roughly select the strong magnetic of vertical ring The concentrate of machine, grade are 44%, and the comprehensive concentrate that two sections of continuous vertical rings of response rate 14%-15% are scanned and grade are 49%, return The concentrate of the selected Verticle ring high intensity magnetic separator of yield 12%-13% collectively forms finally comprehensive iron ore concentrate;Two sweep the strong magnetomechanical of vertical ring and two The mine tailing putting down the strong magnetomechanical of ring constitutes comprehensive mine tailing;
G, described comprehensive iron concentrate grade are 50-52%, and the response rate reaches 70%-72%;Comprehensive tailings grade is 16%- 20%.
Described roughly selects the two-layer ring that Horizontal ring high intensity magnetic separator separation ring is upper and lower arranged concentric, and two-layer separation ring is all carried out slightly It is elected to be industry.
Described scans the two-layer ring that Horizontal ring high intensity magnetic separator separation ring is also upper and lower arranged concentric, and two-layer separation ring respectively executes Scan operation for one section, and lower floor's ring field intensity is higher than upper strata ring field intensity.
It is an advantage of the invention that:
1)Speculum iron fine ore is first passed through two sections of continuous closed circuit grindings and is directly ground to speculum iron and stone-like pulse by the technique of the present invention Monomer dissociation, this mode avoids that speculum iron magnetic is weak, iron loss larger situation when fully dissociation just sorts ferrum, The higher recovery of ferrum be ensure that on source;
2)Every section of ore grinding of the technique of the present invention is all closed circuit using ball milling-cyclone-dusting cover, and classification is joined with granularity using gravity Close the mode of classification.The preliminary gravity classification of this mode cyclone, the not only big small investment for the treatment of capacity, and also underflow density can be directly Meet the requirement of this section of ball mill concentration for the treatment of;The strict control undersize degree of dusting cover Inspection graduation energy, effectiveness of classification is high, under being Duan Zuoye creates favourable granularity condition;
3)The technique of the present invention, the mine tailing roughly selecting the strong magnetomechanical of vertical ring feeds thickness grading cyclone, and coarse fraction sorts system Continuously scan vertical ring strong magnetic technique using two sections, fine fraction sorts using roughly selecting the strong magnetic of the vertical ring of the strong magnetic of flat ring-selected-scan flat ring Strong magnetic technique.The method of this preparation of sized raw coal sufficiently make use of vertical ring price to be less than flat ring, and field intensity is applied to back less than flat ring Receive the feature of the higher coarse fraction iron ore concentrate of magnetic, though and flat ring price is applied to back also above vertical ring higher than founding ring, field intensity Receive the feature of fine fraction iron ore concentrate, be conducive to improving grade and the response rate of final iron ore concentrate, increase and select factory's benefit;
4)The technique of the present invention, scans the two-layer ring that Horizontal ring high intensity magnetic separator separation ring is also upper and lower arranged concentric, and two-layer is divided Operation is scanned in one section of each execution of ring selection, and lower floor's ring field intensity is higher than upper strata ring field intensity, and a kind of equipment completes two sections and scans operation, has Beneficial to reduction equipment and capital expenditure;
5)The technique of the present invention, the grade of final iron ore concentrate can bring up to 50-52%, and the response rate can bring up to 70%-72%, Greatly increased the economic benefit in ore dressing plant, reduce the loss of iron resource.
Brief description
Fig. 1 is the schematic flow sheet of the present invention.
Specific embodiment
Further illustrate the specific embodiment of the present invention below in conjunction with the accompanying drawings:
As shown in figure 1, the present invention of the present inventionOneKind of speculum iron fine ore sorting process it is characterised in that:Including ore grinding Hierarchy system and magnetic separation sort system, enter to grind head grade 33%, and granularity is 0-15mm, comprises the following steps that:
A, speculum iron fine ore first pass through two sections of continuous closed circuit grindings and are directly ground to speculum iron and stone-like pulse monomer dissociation;Every section of mill Ore deposit is all closed circuit using ball milling-cyclone-dusting cover, and the grading sifter partition size in two sections of closed circuit grindings is 0.074mm;
One section of cyclone overflow fineness during first paragraph ball milling-cyclone-dusting cover I is closed circuit is -0.074mm content 55%- 60%, one section of cyclone overflow feeds one section of dusting cover I, and one section of dusting cover I yield is that 40% oversize feeds second segment ball milling-rotation The closed circuit cyclone of stream device-dusting cover II;
One section of described dusting cover adopts five road eclipsed form high frequency fine screen machines.Its five roads eclipsed form high frequency fine screen machine up and down totally five Layer arranged superposed, sieve side 5 feed ports of corresponding arrangement side by side, so it is greatly improved the disposal ability of sieve;
Two-stage nitration cyclone overflow fineness during second segment ball milling-cyclone-dusting cover II is closed circuit is -0.074mm content 75%- 80%, two-stage nitration cyclone overflow feeds two-stage nitration dusting cover II, and two-stage nitration dusting cover II yield is 23% oversize return second segment eddy flow Device, one section of dusting cover undersize of -0.074mm and two-stage nitration dusting cover II undersize merge into grade 33%, the product of yield 100% Product feed the middle magnetic separator that magnetic separation sorts system;
Speculum iron fine ore is first passed through two sections of continuous closed circuit grindings and is directly ground to speculum iron and stone-like pulse list by the technique of the present invention Body dissociates, and this mode avoids that speculum iron magnetic is weak, and iron loss larger situation when fully dissociation just sorts ferrum, in source The higher recovery of ferrum be ensure that on head, be that hypomere magnetic concentration working creates favourable granularity condition;
B, grade 32.7%, the middle magnetic separator mine tailing of the response rate 98% feeds roughly selects the strong magnetomechanical of vertical ring;
C, grade 26%, the mine tailing roughly selecting the strong magnetomechanical of vertical ring of the response rate 57% feeds thickness grading cyclone;Thickness grading The P80=60 micron of cyclone, the underflow coarse fraction product of the response rate 18% feeds two sections and continuously scans the strong magnetomechanical of vertical ring;Thickness is divided The P80=28 micron of level cyclone, the overflow fine fraction product of the response rate 39% feeds roughly selects the strong magnetomechanical of flat ring;
D, grade 40%, the concentrate roughly selecting the strong magnetomechanical of flat ring of the response rate 12% feeds the strong magnetomechanical of selected vertical ring, grade 32%, The mine tailing of the strong magnetomechanical of selected vertical ring of the response rate 8% returns and roughly selects Horizontal ring high intensity magnetic separator, grade 25%, and roughly selecting of the response rate 35% is flat The mine tailing of the strong magnetomechanical of ring feeds two sections and continuously scans the strong magnetomechanical of flat ring;
E, grade are 42%, one section of the response rate 27% scan the strong magnetomechanical of flat ring and two-stage nitration scans the comprehensive essence of the strong magnetomechanical of flat ring Ore deposit returns to the strong magnetomechanical of selected vertical ring;
F, grade be 53%, the middle magnetic separator concentrate of the response rate 2%, grade be 52%, the response rate 41% roughly select the strong magnetic of vertical ring The concentrate of machine, grade are 44%, and the comprehensive concentrate that two sections of continuous vertical rings of response rate 14%-15% are scanned and grade are 49%, return The concentrate of the selected Verticle ring high intensity magnetic separator of yield 12%-13% collectively forms finally comprehensive iron ore concentrate;Two sweep the strong magnetomechanical of vertical ring and two The mine tailing putting down the strong magnetomechanical of ring constitutes comprehensive mine tailing;
G, described comprehensive iron concentrate grade are 50-52%, and the response rate reaches 70%-72%;Comprehensive tailings grade is 16%- 20%.
Preferably, of the present invention the two-layer ring that Horizontal ring high intensity magnetic separator separation ring is upper and lower arranged concentric, two-layer are roughly selected Separation ring all carries out roughly selecting operation.
Preferably, of the present invention scan Horizontal ring high intensity magnetic separator separation ring also be upper and lower arranged concentric two-layer ring, two Operation is scanned in one section of each execution of layer separation ring, and lower floor's ring field intensity is higher than upper strata ring field intensity.Complete two sections using a kind of equipment to sweep It is elected to be industry, advantageously reduce equipment and capital expenditure.
The technique of the present invention, the grade of final iron ore concentrate can bring up to 50-52%, and the response rate can bring up to 70%-72%, greatly The big economic benefit that increased ore dressing plant, reduces the loss of iron resource.

Claims (2)

1.OnePlant speculum iron fine ore sorting process it is characterised in that inclusion grinding classification system and magnetic separation sort system, enter to grind former Ore deposit grade 33%, granularity is 0-15mm, comprises the following steps that:
A, speculum iron fine ore first pass through two sections of continuous closed circuit grindings and are directly ground to speculum iron and stone-like pulse monomer dissociation;Every section of ore grinding is equal Closed circuit using ball milling-cyclone-dusting cover, the grading sifter partition size in two sections of continuous closed circuit grindings is 0.074mm;
One section of cyclone overflow fineness during first paragraph ball milling-cyclone-dusting cover I is closed circuit is -0.074mm content 55%-60%, one Section cyclone overflow feeds one section of dusting cover I, and one section of dusting cover I yield is that 40% oversize feeds second segment ball milling-cyclone- The closed circuit cyclone of dusting cover II;
Two-stage nitration cyclone overflow fineness during second segment ball milling-cyclone-dusting cover II is closed circuit is -0.074mm content 75%-80%, Two-stage nitration cyclone overflow feeds two-stage nitration dusting cover II, and two-stage nitration dusting cover II yield is 23% oversize return second segment cyclone ,- One section of dusting cover I undersize of 0.074mm and two-stage nitration dusting cover II undersize merge into grade 33%, and the product of yield 100% is given Enter the middle magnetic separator that magnetic separation sorts system;
B, grade 32.7%, the middle magnetic separator mine tailing of the response rate 98% feeds roughly selects the strong magnetomechanical of vertical ring;
C, grade 26%, the mine tailing roughly selecting the strong magnetomechanical of vertical ring of the response rate 57% feeds thickness grading cyclone;Thickness grading eddy flow The P80=60 micron of device, the underflow coarse fraction product of the response rate 18% feeds two sections and continuously scans the strong magnetomechanical of vertical ring;Thickness grading is revolved The P80=28 micron of stream device, the overflow fine fraction product of the response rate 39% feeds roughly selects the strong magnetomechanical of flat ring;
D, grade 40%, the concentrate roughly selecting the strong magnetomechanical of flat ring of the response rate 12% feeds the strong magnetomechanical of selected vertical ring, grade 32%, reclaims The mine tailing of the strong magnetomechanical of selected vertical ring of rate 8% returns roughly selects the strong magnetomechanical of flat ring, grade 25%, the response rate 35% roughly select the strong magnetic of flat ring The mine tailing of machine feeds two sections and continuously scans the strong magnetomechanical of flat ring;
E, grade are 42%, one section of the response rate 27% scan the strong magnetomechanical of flat ring and two-stage nitration is scanned the comprehensive concentrate of the strong magnetomechanical of flat ring and returned Return to the strong magnetomechanical of selected vertical ring;
F, grade are 53%, and the middle magnetic separator concentrate of the response rate 2%, grade are 52%, the response rate 41% roughly select the strong magnetomechanical of vertical ring Concentrate, grade are 44%, and the comprehensive concentrate that two sections of continuous vertical rings of response rate 14%-15% are scanned and grade are 49%, the response rate The concentrate of the selected Verticle ring high intensity magnetic separator of 12%-13% collectively forms finally comprehensive iron ore concentrate;Continuously scan the strong magnetomechanical of vertical ring for two sections Second segment scan vertical ring strong magnetomechanical mine tailing and two-stage nitration is put down the mine tailing of the strong magnetomechanical of ring and constituted comprehensive mine tailing;
G, described comprehensive iron concentrate grade are 50-52%, and the response rate reaches 70%-72%;Comprehensive tailings grade is 16%-20%.
2. speculum iron fine ore sorting process according to claim 1 is it is characterised in that described roughly selects Horizontal ring high intensity magnetic separator Separation ring is the two-layer ring of upper and lower arranged concentric, and two-layer separation ring all carries out roughly selecting operation.
Speculum iron fine ore sorting process according to claim 1 is it is characterised in that described Horizontal ring high intensity magnetic separator of scanning divides Ring selection is also the two-layer ring of upper and lower arranged concentric, and operation is scanned in one section of each execution of two-layer separation ring, i.e. upper strata separation ring execution the One section of flat ring scans operation, and lower floor's separation ring execution second segment flat ring scans operation, and lower floor's ring field intensity is higher than upper strata ring field intensity.
Speculum iron fine ore sorting process according to claim 1 is it is characterised in that one section of described dusting cover adopts five road weights Stacked high frequency fine screen machine.
CN201410467518.6A 2014-09-15 2014-09-15 Specularite dust ore dressing technology Active CN104437827B (en)

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