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Dry preconcentration tailing discarding method for low-grade lava magnetite

A magnetite, low-grade technology, applied in chemical instruments and methods, magnetic separation, solid separation, etc., can solve the problems of high energy consumption for grinding, increase grinding cost, and unsatisfactory separation effect, and save equipment. and civil construction investment, reducing energy consumption and steel ball consumption, and pre-selection and discarding have significant effects.

Inactive Publication Date: 2017-12-15
YUXI DAHONGSHAN MINING
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low magnetite content of low-grade lava magnetite and the fine particle size of embedded distribution, if the ore is crushed and the particle size is coarse, it is difficult to achieve a good monomer dissociation degree, which will affect the magnetic separation effect
In the existing low-grade lava magnetite beneficiation technology, when the amount of pre-selected tailings is small, the amount of ore entering the grinding is large and the grade of the grinding is low, resulting in high energy consumption for grinding and increasing the cost of grinding, or pre-selecting the tailings When the amount is too large, the loss rate of magnetite is large, resulting in waste of resources and increased beneficiation costs. These are the key problems in the development and utilization of low-grade lava magnetite containing magnetite
In addition, the separation effect of the existing dry magnetite powder ore separation equipment is not ideal. Due to the magnetic agglomeration, wrapping, adhesion and other reasons of the magnetite powder ore, the separation and enrichment ratio of the magnetite powder ore is low. , the grade of beneficiation concentrate is limited, the amount of tailings is small, the grade of tailings magnetic iron is high, and the loss of metallic iron is serious
In order to solve the problem of magnetic agglomeration, wet magnetic separation is used for pre-selection and tailings of low-grade magnetite, which is currently more effective, but it will be limited by water resources, and water pollution and treatment costs are high.

Method used

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  • Dry preconcentration tailing discarding method for low-grade lava magnetite
  • Dry preconcentration tailing discarding method for low-grade lava magnetite
  • Dry preconcentration tailing discarding method for low-grade lava magnetite

Examples

Experimental program
Comparison scheme
Effect test

experiment example 1

[0038] The open-pit lava mine of the main ore body of Dahongshan Iron-copper Mine was sampled and analyzed. The results of multi-element chemical analysis are shown in Table 1, and the results of iron phase analysis in the ore samples are shown in Table 2.

[0039] Table 1 Multi-element chemical analysis results (%)

[0040]

[0041] Table 2 Analysis results of iron phase in ore samples (%)

[0042]

[0043] From the chemical analysis results of the raw ore in Table 1, it can be seen that the raw ore contains 19.08% iron, which belongs to low-grade ore, and the SiO in the ore 2 、Al 2 o 3 The content is high, and the content of harmful element S is low.

[0044]From the chemical analysis results of the raw ore in Table 2, it can be seen that the main metal mineral of the lava iron ore is magnetite, accounting for 70.94%, red limonite and siderite accounting for 15.53% in total, and the iron content in the refractory silicate reaches 12.68%.

[0045] Taking ore at 910-...

Embodiment 1

[0050] The raw ore in Table 3 of Experimental Example 1 is carried out dry pre-selection and tailings, and the steps are as follows:

[0051] S100: The raw ore above is subjected to primary crushing by a PE750×1060 jaw crusher and secondary crushing by a CF300 cone crusher in sequence to obtain secondary crushing ore particles;

[0052] S200: Sieve the above-mentioned medium crushed ore particles through 3YK-1860 circular vibrating sieve Ⅰ with amplitude 7mm, amplitude frequency 730 times / min, sieve surface inclination 26 degrees, sieve hole size 25×30, to obtain under-sieve product I and on-sieve product Product I;

[0053] S300: return the above-mentioned product I on the sieve to the circular vibrating sieve in step B after finely crushing it through the S155D cone crusher;

[0054] S400: The above-mentioned under-screen product I is further crushed by a vertical shaft impact crusher to obtain ultra-fine crushed ore particles;

[0055] S500: Sieve the above ultra-fine cru...

Embodiment 2

[0062] The raw ore in Table 3 of Experimental Example 1 is carried out dry pre-selection and tailings, and the steps are as follows:

[0063] S100: The raw ore above is subjected to primary crushing by a PE750×1060 jaw crusher and secondary crushing by a CF300 cone crusher in sequence to obtain secondary crushing ore particles;

[0064] S200: Sieve the above-mentioned medium crushed ore particles through a 2YA2460 vibrating sieve I with a sieve size of 20×20mm to obtain an under-sieve product I and an over-sieve product I;

[0065] S300: return the above-mentioned product I on the sieve to the circular vibrating sieve in step B after finely crushing it through the S155D cone crusher;

[0066] S400: The above-mentioned under-screen product I is further crushed by a high-pressure roller mill to obtain ultra-fine crushed ore particles;

[0067] S500: Sieve the above ultra-fine crushed ore particles through the 2YA2460 vibrating screen II with a sieve size of 7.5×10mm to obtain t...

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Abstract

The invention discloses a low-grade lava magnetite dry-type pre-selection tailings method, which comprises the steps of sequentially passing the raw ore of the low-grade lava magnetite through a jaw crusher for primary crushing and a cone crusher I for secondary crushing to obtain medium crushed ore particles; The above-mentioned medium crushed ore particles are sieved through the sieving machine I with a sieve size of 20-30mm to obtain the under-sieve product I and the over-sieve product I; the above-mentioned over-sieve product I is finely crushed by the cone crusher II and then returned to step B. Screening machine Ⅰ; the above-mentioned under-sieve product I is further crushed by ultra-fine crushing equipment to obtain ultra-fine crushed ore particles; the above-mentioned ultra-fine crushed ore particles are screened by a sieve machine II with a sieve size of 5-10 mm to obtain under-sieve products II and On-sieve product II, the above-sieve product II is returned to step D and combined with the under-sieve product I; the above-mentioned under-sieve product II is magnetically separated by a dry-type weak magnetic separator to obtain pre-selected concentrate and pre-selected tailings, and the pre-selected tailings Mine tailings. The invention has the characteristics of short process, energy saving and environmental protection, strong adaptability and high mineral processing technical index.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal beneficiation, and in particular relates to a low-grade lava magnetite dry-type pre-selection tailing method with short process, energy saving and environmental protection, strong adaptability and high mineral beneficiation technical index. Background technique [0002] Lava iron ore belongs to a single magnetite ore, the main metal minerals are magnetite, hematite, limonite, a small amount of siderite, and the main gangue minerals are albite, quartz, mica, chlorite and so on. [0003] The Dahongshan-type iron ore deposit, which accounts for about 18% of my country's iron ore resources, is a typical representative of volcanic rock-type deposits, with a large proportion of red limonite, high content of silicate and iron silicate minerals, high content of fine particles, The characteristics of high silicon content in iron concentrate and high iron content in tailings. In particular, it has the...

Claims

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Application Information

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IPC IPC(8): B02C21/00B02C23/14B07B1/28B07B1/46B03C1/10
CPCB02C21/00B02C23/14B03C1/10B07B1/28B07B1/4609B07B2201/04
Inventor 焦栋刑志华蔺朝晖宋钊刚蔡正鹏温海滨浦猛詹忠杰
Owner YUXI DAHONGSHAN MINING
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