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Efficient beneficiation method for low-grade titanic magnetite hard to select and smelt

A technology of titanomagnetite and ore dressing method, which is applied in the field of high-efficiency ore dressing of low-grade refractory titanomagnetite, which can solve the problems of large iron metal loss, loss, and less tailings

Active Publication Date: 2017-11-10
YUXI DAHONGSHAN MINING
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] (1) The iron grade of low-grade ore is extremely low, and the surrounding rock near the ore has a gradual relationship with the ore, and the boundary between the ore and the surrounding rock is unclear. The ore is selected by adopting the current mature large-block dry magnetic separation tailings or large-block jigging technology Generally, the grade is only increased by 2 percentage points, and at the same time, the amount of tailing is very small, and the loss of iron metal is very large
[0005] (2) During the mining process, the ore loss rate and waste rock mixing rate are difficult to control, resulting in difficult control of the grade of the selected ore
[0006] (3) Due to the low iron grade of the ore, relatively difficult grinding and separation, and large beneficiation ratio, if the conventional beneficiation technology is used to process it, it will result in high concentrate costs, poor economic benefits or losses in the mine
[0007] (4) Due to the limitation of the separation principle of dry magnetic separation equipment, the tailing effect of dry magnetic separation for finer ore is poor, and there is no mature high-efficiency wet magnetic separation equipment suitable for finely crushed products.
The principle of "selecting iron first and then titanium" includes relatively independent iron ore production lines and titanium ore production lines. After the minerals are processed through the iron ore production line, the minerals with low iron content enter the titanium ore production line for further processing. There are many equipment configurations, high construction investment, management and operation costs; in the principle of "iron and titanium co-grinding and separation", the separation of iron ore and titanium ore is basically carried out synchronously. In the grinding step, there are difficulties in controlling the particle size of minerals , resulting in serious over-grinding of ilmenite, the minerals in the mineral particles cannot be recovered well, and the utilization rate of titanium resources is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] like figure 1 As shown, the raw ore iron grade of Yuhezhai Iron Mine is 19.29%, TiO 2 The grade is 5.03%, and the moisture content of the raw ore is 3.3%. The above-mentioned raw ore is selected according to the following steps:

[0044] S100: Crushing the raw ore above through a PE900×1200 jaw crusher to a particle size of -10mm;

[0045] S200: Put the crushed raw ore through φ5.5×1.8 semi-automatic closed-circuit wet grinding to obtain pulp with a fineness of -200 mesh accounting for more than 70% and a concentration of 30.5%. The pulp is classified by a φ350 hydrocyclone I to obtain a concentration For 17.4% fine grain overflow Ⅰ and coarse grain pulp Ⅰ, the coarse grain pulp Ⅰ is wet re-grinded by φ3.2×5.4 ball mill and then returned to φ350 hydrocyclone Ⅰ for classification;

[0046] S300: Pass fine particle overflow I through weak magnetic separation I with a magnetic induction intensity of 200mT to obtain iron concentrate slurry I and tailings slurry I with a ...

Embodiment 2

[0052] like figure 2 As shown, the raw ore iron grade of Yuhezhai Iron Mine is 21.37%, TiO 2 The grade is 4.95%, and the moisture content of the raw ore is 3.5%. The above-mentioned raw ore is selected according to the following steps:

[0053] S100: Crushing the raw ore above through a PE900×1200 jaw crusher to a particle size of -10mm;

[0054] S200: Put the crushed raw ore through φ5.5×1.8 semi-automatic closed-circuit wet grinding to obtain pulp with a fineness of -200 mesh accounting for more than 70% and a concentration of 32.8%. The pulp is classified by a φ350 hydrocyclone I to obtain a concentration For 18.3% fine grain overflow Ⅰ and coarse grain pulp Ⅰ, the coarse grain pulp Ⅰ is wet re-grinded by φ3.2×5.4 ball mill and then returned to φ350 hydrocyclone Ⅰ for classification;

[0055] S300: Pass fine particle overflow I through weak magnetic separation I with a magnetic induction intensity of 150mT to obtain iron concentrate slurry I and tailings slurry I with a...

Embodiment 3

[0062] like figure 2 As shown, the raw ore iron grade of Yuhezhai Iron Mine is 18.86%, TiO 2 The grade is 5.11%, and the moisture content of the raw ore is 3.2%. The above-mentioned raw ore is selected according to the following steps:

[0063] S100: Crushing the raw ore above through a PE900×1200 jaw crusher to a particle size of -10mm;

[0064] S210: Put the crushed raw ore through a φ5.5×1.8 semi-automatic closed-circuit wet grinding to obtain a pulp with a fineness of -200 mesh accounting for more than 50%;

[0065] S220: The ore pulp obtained by S210 grinding is screened by a linear sieve to obtain under-sieve pulp and over-sieve coarse ore with a fineness of -200 mesh accounting for more than 70% and a concentration of 29.34%. 1.8 Semi-automatic closed circuit wet regrinding;

[0066] S230: Classify the under-screen pulp through φ350 hydrocyclone I to obtain fine particle overflow I and coarse pulp I with a concentration of 17.06%, and return the coarse pulp I to φ3...

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Abstract

The invention discloses an efficient beneficiation method for low-grade titanic magnetite hard to select and smelt. The method comprises the steps that in the crushing step, the low-grade titanic magnetite hard to select and smelt is crushed; in the first section ore grinding classification step, the titanic magnetite obtained after crushing is ground, first rotational flow classification is conducted, first fine particle overflow and first coarse grain pulp are obtained, and the first coarse grain pulp is subjected to first grinding again to return,; in the one-section low intensity magnetic separation step, the first fine particle overflow is subjected to first low intensity magnetic separation, and first iron concentrate pulp and first tailings pulp are obtained; in the screening classification step, the first iron concentrate pulp I is screened, and plus sieve coarse ore and minus sieve fine pulp are obtained; and in the second-section ore grinding classification step, the first iron concentrate pulp and the plus sieve coarse ore are combined and subjected to second rotational flow classification, second fine particle overflow and second coarse grain pulp II are obtained, and the second coarse particle pulp is subjected to second grinding to return to second rotational flow classification. For the low-grade titanic magnetite hard to select and smelt, the iron and titanium recycling rate is increased in combination of rotational flow classification and low intensity magnetic separation, and the method has the beneficial effects of being simple in technology, easy to operate and high in beneficiation efficiency.

Description

technical field [0001] The invention belongs to the technical field of ferrous metal beneficiation, and in particular relates to a high-efficiency beneficiation method for low-grade refractory titanomagnetite with simple process, easy operation, low cost, high beneficiation efficiency and high recovery rate of iron and titanium. Background technique [0002] More than 95% of my country's iron ore reserves are lean ore, with an average grade of only about 32.00%. Due to the constraints of technical level and economic benefits, on the one hand, a large number of ultra-poor off-surface ores and poor miscellaneous ores stripped from most existing iron mines during the mining process are piled up and unused; on the other hand, there are still a large number of Ultra-poor iron ore has not yet been developed and utilized. With the rapid development of the iron and steel industry, iron ore resources with good geological conditions, high resource grades, and good sorting properties ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03B7/00B03B9/00
CPCB03B7/00B03B9/00
Inventor 邓琴刑志华蔺朝晖宋钊刚朱冰龙蔡正鹏孙贵爱沙斌温合平温海滨董慧琳饶荣军焦栋詹忠杰
Owner YUXI DAHONGSHAN MINING
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