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High-sulfur complex iron ore quality-improving and impurity-decreasing separation technology

A technology for iron ore quality improvement, which is applied in the field of high-sulfur composite iron ore quality improvement and impurity-reduction beneficiation technology, can solve the problems of large amount of flotation reagents, large equipment corrosion, no sulfur recovery, etc., to save reagent consumption, The effect of reducing the amount of ore and reducing the sulfur content

Active Publication Date: 2017-11-28
马钢集团设计研究院有限责任公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Aiming at the problems existing in the prior art that the desulfurization of high-sulfur composite iron ore causes great corrosion to equipment, large dosage of flotation agents, and no recovery of sulfur, the present invention provides a high-sulfur composite iron ore beneficiation for improving quality and reducing impurities. craft

Method used

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  • High-sulfur complex iron ore quality-improving and impurity-decreasing separation technology
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  • High-sulfur complex iron ore quality-improving and impurity-decreasing separation technology

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Experimental program
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Effect test

Embodiment 1

[0057] For the above ores, traditional methods such as figure 2 The composite iron ore is processed by the process of "floating first - then magnetic" shown, that is, after a stage of grinding in the laboratory XMQ-67 type 240×90mm conical ball mill, the particle size -0.074mm accounts for 55% (that is, 200 Mesh sieve sieve accounted for 55%), ore feed rate 200g, did the condition test of different collector consumption, test result is shown in Table 4:

[0058] Table 4 Experimental results of collector dosage conditions in the process of "floating first - magnetism later" (%)

[0059]

[0060] According to the above table, with the increase of collector dosage, the total sulfur grade decreased slightly, and the recovery rate increased. When the amount of AT708 increases from 300g / t to 350g / t, the TS grade decreases from 39.18% to 39.06%, and the recovery rate increases from 47.95% to 48.30%, with a small increase. Therefore, 300g / t of AT708 is the best condition.

Embodiment 2

[0062] Adopt the present invention such as above ore figure 1 The "magnetic first - float after" process shown, that is, the tailings after the stage magnetic separation (the content of the second stage grinding -0.074mm accounts for 80%, the tailings after the two stage magnetic separation) is used as the flotation sample , TFe content 21.29%, TFe recovery rate 44.55%, TS content 8.268%, TS recovery rate 99.16%. The condition test of different collectors was carried out, and the test results are shown in Table 5:

[0063] Table 5 Experimental results of collector dosage conditions in the process of "magnetism first - floatation later" (%)

[0064]

[0065]

[0066] It can be seen from the above table that with the increase of the amount of AT708, the grade of TS decreases greatly, while the recovery rate of TS increases slowly. When the amount of AT708 increased from 250g / t to 300g / t, the TS grade decreased from 37.95% to 36.64%, and the recovery rate increased from 4...

Embodiment 3

[0068] For the above ores, adopt the traditional "float first - then magnetic" process to process the composite iron ore for sulfur separation treatment, such as image 3 As shown, the steps are:

[0069] Step 1. After the composite ore is crushed, the crushed ore product is controlled to have a grinding particle size below 2mm, and then undergoes a stage of grinding, and the grinding fineness is controlled at -200 mesh by cyclone classification, accounting for 55%;

[0070] Step 2. Flow the ore pulp to the flotation stirring tank for stirring. The amount of coarse collector AT708 is 250g / t, and the foaming agent 2# oil (ROH) is 30g / t to obtain sulfur concentrate. After testing, the grade of sulfur concentrate is TS 39.18% and tailings; carry out secondary flotation and primary scavenging on the tailings to obtain medium sulfur ore with TS grade of 28.45% and final tailings (TS grade 2.99%).

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Abstract

The invention discloses a high-sulfur complex iron ore quality-improving and impurity-decreasing separation technology and belongs to the technical field of shaft furnace transforming construction. After complex ores are crushed, products undergo primary grinding; then low intensity magnetic separation is conducted on ore pulp to obtain low intensity concentrates and tailings; secondary grinding is conducted on the low intensity concentrates; staged low intensity magnetic separation is conducted on the ore pulp, and then elutriation is performed by an elutriation and magnetic separation machine to obtain iron concentrates and tailings; the tailings are concentrated and then are floated to obtain sulfur concentrates and tailings. The industrial prejudice of a 'floatation and then magnetic separation' process in existing ore separation is overcome, a 'magnetic separation, floatation and re-separation' process is adopted during desulfurization of high-sulfur complex iron ores, a variety of useful ores are recovered, the purposes of improving precision, decreasing sulfur and reducing energy consumption are achieved, and economic benefits are increased. The technical problems of large device corrosion, large floatation agent using amount and no sulfur recovery during desulfurization of the high-sulfur complex iron ores are solved.

Description

technical field [0001] The invention relates to the technical field of mineral processing, in particular to a mineral processing process for improving the quality and reducing impurities of high-sulfur composite iron ore. Background technique [0002] Energy saving and consumption reduction means saving energy, reducing consumption, and using the least investment to obtain the greatest economic benefits. Energy conservation and consumption reduction has become a basic national policy of our country. Guided by the scientific concept of development, our country is accelerating the development of modern energy industry, adhering to the basic national policy of saving resources and protecting the environment, and placing the construction of a resource-saving and environment-friendly society on the industrialization and modernization The prominent position of the development strategy, strive to enhance the ability of sustainable development, build an innovative country, and conti...

Claims

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Application Information

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IPC IPC(8): B03B7/00B03B9/00
CPCB03B7/00B03B9/00
Inventor 孙业长刘建华束剑姚卫红江斌耿希华李美鲜邓秀兰
Owner 马钢集团设计研究院有限责任公司
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