JPS58159856A - Treatment for enriching iron in low-grade iron ore - Google Patents

Abstract

PURPOSE:To enrich ore and to efficiently selecting out concentrate high-grade ore in floatation separation of low-grade iron ore, by using a combination of a specified dimer acid and an aliphatic amine as a collector. CONSTITUTION:Low grade iron ore, such as hematite contg. quartz and veinstone is crushed, and when needed, treated with a magnetic separator. This raw concentrate is treated by floatation using a dimer acid or its salt obtd. by dimerizing an unsatd. aliphatic acid as a collector in the first step, and again treated by floatation using an aliphatic amine as a collector in the second step. In addition, when needed, a controller, such as starch is used, and a proper soluble Ca salt is used as an activator. This process permits enriching low grade iron ore having 40-50wt% iron grade, and obtaining concentrate high in iron grade efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention describes a method for mineralizing and enriching low-grade iron ore containing 0@ of gangue minerals on quartz by a flotation method.
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Iron ore has a higher I value than non-ferrous metal minerals, and is a relatively large-scale ore, 90 Kl, and has traditionally been used as a ttsv iron raw material without the need for special beneficiation. However, as the reserves of iron ore decrease, a situation arises in which even low-grade iron ore has to be used. development is progressing.

In addition, in order to cope with the shortage of iron ore and promote the effective use of domestic resources, trade is increasing to effectively utilize low-grade hemtite minerals, which have abundant reserves.

By the way, among low-grade iron ores, iron minerals with relatively coarse grains (more than 14111 degrees) are washed with water, have a specific gravity of I
It is possible to improve the shearing grade even with a relatively simple beneficiation method, as in low-grade hematite ore, where the hematite particle size is as small as 11%/h (almost 0.1 to 0.0%). 2■φ
In the case of (below), it is difficult to separate the ore into individual pieces without crushing it in a rut, and it is also easy to concentrate the ore after crushing.Currently, this purpose has been achieved by the flotation method. In flotation of low-grade hematite ore, either the method of concentrating the hematite on the earth side or the method of wrapping it on the Vnta side *0 is carried out, but at the initial stage O, fatty acids are used as a trapping agent. Or its fortune) @ the former method - occupied a tributary. However, this method was unable to combine the selectivity with the effect of sufficient iron content. On the other hand, the latter method uses scavenging agents such as aliphatic amines, which improves selectivity and yields relatively high-quality concentrate; therefore, the latter method is currently used. method has become mainstream. In this case, starch may also be used as an inhibitor.
Therefore, technology has been established to further improve the iron quality.

However, even if we make full use of the latest flotation technology mentioned above, it is difficult to efficiently separate high-grade minerals from low-grade hemamate ore. The most preferable weight bag tree is 62 to 68 weight III steel, and if you try to increase the iron quality any further, you will have to ignore productivity and lengthen the opening time of III steel or beneficiation. It is necessary to repeat lk times, and the actual yield also decreases as the number of times increases.

The present inventors have focused on the above-mentioned circumstances, and have developed a rich mineralization process f11 method that can efficiently separate high-grade iron ore from low-grade iron ore such as low-grade hematite mineral on an actual operational scale. We have been conducting research in anticipation of development. The present invention was completed as a result of such research.

Its composition is that low-grade iron ore containing quartz and other gangue minerals is mineralized by the flotation method, and unsaturated fatty acids are added as a P1 collector.
Using the dimer powder obtained by polymerization and/or its wood, the O magnetic selection effect was investigated when the air zero magnetic field O magnetic flux density was varied in the range of a, oao to s, o o o Gauss -k (as a magnetic element, (Using lA1 Engineering aFX Pantome Ik),
The results are shown in Table @1.

As is clear from Table 8, high magnetic force AM is extremely effective as a method of raising low-grade materials to medium-grade ones. However, it is impossible to obtain high-grade ore by high-magnetic magnetic separation, and Fig. 1 shows that if high-magnetic magnetic separation is carried out using the above method and v4-like method, the iron content is The relationship between O yield and iron grade (F content) is good.If the actual yield of iron is increased, the iron grade will decrease, and if the iron content is increased, the actual yield will be extremely reduced. The nine dice yield is 6
Even if the iron grade is kept to 0, the limit is about 60, but with lIM magnetic separation alone, the iron grade can be raised to 60 or more.
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According to these results), when mineralizing low-grade iron ore, the iron grade is raised to a certain level by using high-force magnetic separation, etc., and then high-grade ON ore is extracted by flotation. It is thought that the method of making light of it is effective.

Therefore, the present inventors conducted a preliminary experiment using IIL9 aliphatic acetate (beef tallow cyamine acetate) as a collecting agent, which obtained the best results in the supplementary test as a collector, targeting the crude concentrate obtained by high-magnetic magnetic separation as shown in Table 4. The performance as a collection agent was confirmed for the first time. Dimer acid or its derivatives obtained by polymerizing unsaturated fatty acids [especially Versadime (OJ mark: manufactured by Henkel Japan Co., Ltd.)]
We investigated the flotation effect when using 1 and 9, respectively.

■Therefore, if the material contains multiple types of gangue minerals other than quartz, as shown in Example O, the separation of gangue minerals other than quartz will be insufficient, which will impede the improvement of iron quality. ,
is possible.

By the way, Versadime does not necessarily have sufficient selectivity for quartz, as is clear from the experiments below.
It has been shown that it exhibits high selectivity for other gangue minerals such as fluorite.

That is, using the crude concentrate with the chemical composition shown in Table 4 above, maintaining the pulp pH at 1O05 to 11.31, adding ryokuko (22.5 to //) as an inhibitor, and adding 1 Versa Dim. When flotation was carried out by changing the additive warehouse and the contents of F, Sing and OF derived from fluorite in the V-lids were measured, the results shown in Fig. 8 were obtained. As is clear from Figure 8, Versadime hardly contributes to the selective removal of S i O2 (i.e. quartz), but
The selective removal effect on gangue (especially fluorite) is extremely excellent.

From these results, it is possible to effectively improve iron quality by using Versame Muthar aliphatic amine as a scavenger, removing gangue minerals other than quartz with Persadime, and removing quartz with aliphatic amine. It is thought that it will be slow. Therefore, with the above flotation, Versa Dime (the sound used is 22
．． 5my/l) was used, and aliphatic amine (addition amount: l~20〃/l) was used as the gripping steel.
Flotation was performed by adjusting the pulp pH to 105 to 11.8 using starch (addition t: 22J Misaki//) as an inhibitor.

The results are shown in Figure 4.

As is clear from Fig. 4, since the quartz contained in the V-nuc fraction obtained using Versadime as an extractant is removed by the aliphatic amine, the iron content in the final V-nuc fraction is reduced to 1/2. The rate increases to around 651.

In the above, first of all, by Versa Dime] CNjf other than quartz
, the procedure of removing the stone component and then removing the quartz (by aliphatic atom) was adopted, but the reverse procedure was adopted, □, 74.
□hl-E 1ijl (:Ta9,oe,8:
In some cases, both extractants may be added at the same time to remove quartz and other gangue fractions at once. However, in order to make maximum use of the function of each extractor, it is preferable to use a sequential flotation method in which each extractant is added individually.

In the floating j1 ore that suspends the same quartz, CNCl3
It has been confirmed that the suspension of quartz is made easier by adding a large amount of soluble Ca as an activator, and in the present invention, soluble Ca is used in conjunction with the quartz removal step. is extremely effective.

If the 0# content* of the raw material ore is extremely low, it is operationally and economically disadvantageous to increase the iron grade by flotation alone, as was demonstrated in the chicken, so extremely low-grade ore is The iron quality has been increased to 40qII by increasing the processing of high-magnetic cars, etc.
It is better to carry out the iron-rich treatment of the present invention after increasing the iron content to a certain level, and if the raw material ore has an iron grade of about 40 to 60, it is sufficient to carry out the . For example, the Hh diagram shows the rich mineralization rate (7O-V-) used for relatively iron-grade III raw material ore Kl#I, and Figure 6 shows the rich mineralization % field that is used for extremely low-grade raw material ore. 70-F-). However, the present invention is controlled by these flows &-).
(Of course, it is possible to change it to 1 and implement it to the extent that it violates the purpose of the above and below).

The present invention is generally constructed as described above, and uses dimer acid and/or
Or, by using the wood and aliphatic amine in combination, even from low-grade iron ore containing quartz and other polyphyte gangue minerals,
It became possible to efficiently obtain concentrate with high iron quality. Therefore, due to the depletion of high-grade iron ore, active p@ of low-grade iron ore is unavoidable now and in the future.
The practical value of the mouse is extremely great.

Next, examples will be shown.

Example: A low-grade hematite ore containing quartz, fluorite, nijilin, orchidite, amphibole, etc. as gangue minerals and having an iron grade of 26.60 or higher is crushed to a particle size of 44 μm or less, and then processed using a high-magnetic magnetic separator. (Magnetic flux density Ji of empty/D magnetic field: 50
00 Gauss), and the iron grade is 4. The figure shows the amount of aliphatic amine added in the second stage flotation after the first stage flotation using Versatile and the amount of aliphatic amine in the V-ac.・, Sing and y
Figure 5.6 is a flowchart showing the relationship between the content of and the content rate of S/-) illustrating the rich mineralization treatment method of the present invention.

Applicant: Kobe Steel, Ltd. Actual iron yield (%) 6 7 8 9 10 11 12 pH of bulb Figure 3 Persadime addition amount C'19. 'e) ; Figure 4 Addition amount of aliphatic amine ('19.'e) Figure 5

Claims (1)

[Scope of Claims] (1) In processing low-grade iron ore containing quartz and other IMltite minerals into a rich mineralization process by the float ore method,
A method for mineralizing low-grade iron ore, which is characterized by using dimer acid and/or its base obtained by polymerizing a fusible fatty stirrup as a scavenger and an aliphatic amine. (In claim 1, the mineralization treatment method uses starch as an inhibitor. (3) In claim 1 or 2, the pH of the pulp is adjusted to 9.6 to 11.6. A rich mineralization treatment method that is carried out by holding the mineral.
A rich mineralization treatment plant method that uses a soluble bottle as an activator. (6) In any one of claims 1 to 4,
The rich mineralization processing method uses low-grade iron ore with an iron grade of 40 to 50. (6) In claim 1, there is provided a method for mineralization and processing that uses magnetic separation to increase the iron grade and use up low-grade iron ore.