JPS6047329B2 - Production method of uncalcined agglomerate ore - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing non-calcined agglomerate ore for charging fine ore containing metal oxides into a metal smelting furnace as a raw material, which agglomerates quickly. The purpose of this invention is to provide a manufacturing method that can be carried out to obtain strong agglomerated ore.

Conventionally, converting fine ore into unfired agglomerate ore as a charging material for metal smelting furnaces has been a non-pollution, energy-saving, and one-kTE method.
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A large number of manufacturing methods have been proposed.

One example is CO using slaked lime as a binder.

Carbonation granulation method that utilizes calcium carbonate bonds produced by reaction with gas (Special Publication No. 19024/1989,
JP 54-25887, JP 53-41694, JP 48-23613, JP 50-45714
Another example is a method of mixing hydraulic cement and slaked lime as a binder and utilizing both hardening by hydration and hardening by carbonation (Japanese Patent Laid-Open No. 52-5
6m) is proposed. However, since all of the binders shown in these proposals basically use slaked lime as the binder, they have the drawback of being expensive to manufacture.

In addition, it is said that the carbonation reaction of slaked lime proceeds relatively quickly, but in order to achieve rapid and continuous carbonation hardening, it is necessary for the carbonation reaction to be even faster and to form a strong bond. There was a need to develop a manufacturing method, especially a new binder. In order to meet the above-mentioned demands, the inventors focused on the Fe-11 manganese slag and conducted extensive research, resulting in the completion of the present invention.

In general, ferromanganese slags include high, medium, and low carbon ferromanganese slags, and their analytical values (weight%)
and basicity (CaO/5100) are as follows.

As mentioned above, the CaO content in the ferromanganese slag is
Compared to conventional binders, high carbon ferromanganese lag is 12-14% and medium-low carbon ferromanganese lag is 29-35%, compared to conventional binders of 50% or more, respectively, and the basicity is low.
It is characterized by high MnO content.

These ferromanganese slags do not have hydraulic properties by themselves, but if they can be used as a binder, the MnO content in the ferromanganese slags is high, and they can be used as fine ore containing metal oxides. When used as a binder for finely divided manganese ore, the manganese in the slag will be effectively utilized. Therefore, the present inventor conducted research on the use of agglomerated ferromanganese slag, which is inexpensive and effective for manganese, and found that high-carbon ferromanganese slag has a low CaO content and low basicity. , and the progress of crystallization of Nese silicate (Ca.Mn)2/SjO2 is also poor, so it is not suitable as a binder for agglomeration, but medium-low carbon ferromanganese slag is hardened by carbonation It was discovered that it can be used as an agglomeration binder after treatment. When medium-low carbon ferromanganese slag is blended with powdered ore containing metal oxides, then granulated, and the granulated product is hardened with CO2 gas containing water vapor, the carbonation reaction occurs rapidly, resulting in lumps. The formation is rapid and strong agglomerate ore can be obtained.

That is, the present invention involves granulating fine ore containing a metal oxide containing medium-low carbon ferromanganese slag or a slag compound having a similar composition as a binder in an amount of 3 to 15% by weight into pellets or prickets. , a method for producing uncalcined agglomerates characterized by carrying out a hardening treatment with a gas containing 3% by volume or more of CO2 and water vapor, and a second invention of the present invention is Slag or a slag compound with a similar composition
A metal oxide containing 3 to 15% by weight of Boltland cement as a binder is granulated into pellets or prickets, and after wet atmosphere treatment, CO2
This is a method for producing non-calcined agglomerate ore, which is characterized by performing hardening treatment with a gas containing 3% or more of.

In the present invention, the reason for adding medium-low carbon ferromanganese slag or a slag blend having a similar composition as a binder is that after carbonation treatment, as shown in Example 1 below, The crushing strength of the agglomerate ore is high, the carbonation reaction is relatively fast, it is excellent as a binder, it is inexpensive, and the manganese it contains can be used effectively.

In the second aspect of the present invention, the reason for adding medium-low carbon ferromanganese slag plus Boltland cement as a binder is as shown in Example 2 below. Those that have been subjected to both wet atmosphere treatment and hardening treatment using gas containing CO2 containing water vapor have higher crushing strength, are excellent as binders, are inexpensive, and contain manganese. This is due to the effective use of resources.

In the present invention, the addition ratio of the binder is set at 3 to 15% because if it is less than 3% by weight, the binding effect is insufficient and crushing strength cannot be achieved, and if it exceeds 15% by weight, the original purpose of the binder is lost. This is due to the occurrence of other adverse effects and the saturation of crushing strength.

The reason why the CO2 gas concentration was set to 3% by volume or more is that
If it is less than that, agglomeration during carbonation treatment is insufficient,
The reason why water vapor is contained is that it is effective in carbonation treatment.

Next, examples of the present invention will be shown in comparison with conventional examples, and the description of the present invention will be supplemented.

Example 1 10% by weight medium carbon ferromanganese slag as binder
was mixed with finely powdered manganese ore, 7% by weight of water was added, and the sample was granulated using a 17nφ pelletizer into pellets with a diameter of 14±1 mm.

The compositions of the medium carbon ferromanganese slag used as a binder and other minerals used as binders in comparative examples are shown in Table 1. For the carbonation reaction, CO2 containing about 2 volume% of water vapor is used.
Using 3 volume % gas, the reaction was carried out at 65°C for 9 hours. The crush strength of 22 pellets after the reaction was measured and the average value is also shown in Table 1. As is clear from Table 1, the medium-carbon ferromanganese slag used in the present invention has a higher crushing strength after hardening treatment than slaked lime, which has conventionally been used as a binder in carbonation reactions, and it can be used as a binder. It's worth it. Example 2 The same fine powder manganese ore as in Example 1 was used as a raw material, and 5% by weight of medium carbon ferromanganese slag and 5% of Boltland cement were mixed as binders. Pellets with the same specifications were made by the same method as in Example 1. The granulated material was used as a sample.

This sample was hydrated by being kept in a humid atmosphere at 65°C for 5 hours, and then kept in the same reaction gas under the same temperature conditions as in Example 1 for 4 hours. For comparison, 1 weight percent of Boltland cement was mixed as a binder, and pellets with the same specifications were granulated using the same method as above, and then cured at 65°C for 9 hours with only hydration. Comparative samples were obtained by holding the same pellets under the above carbonation treatment conditions for 9 hours.

The crush strength of each of 22 pellets after the reaction was measured and the average value is shown in Table 2.

As is clear from Table 2, when the bovine carbon ferromanganese slag used in the present invention and Boltland cement are combined as binders, only Boltland cement can be used by sequentially performing both hydration and carbonation treatments. A higher crushing strength than that used as a binder was obtained, and it was confirmed that this product was excellent as a binder.

Example 3 SiO2 and MnO are added to converter slag, and MnO, Si
The molar concentration ratio of O2 and CaO is 1:1:1 (calculated as a total composition ratio: CaO: 30% by weight, SiO2: 32% by weight, M
nO: 38% by weight), cooled and pulverized, and mixed with finely powdered manganese ore in % by weight as a binder, and then granulated into pellets with the same specifications by the same method as in Example 1. This sample was subjected to a carbonation reaction under the same conditions as in Example 1.

The crushing strength of 22 pellets after the reaction was measured and the average value was found to be 159k91p. As shown in the examples above, according to the method for producing uncalcined agglomerates of the present invention, a cost-effective medium-low carbon ferromanganese or a slag compound having a similar composition to this is used as a binder. The main purpose is to agglomerate quickly and obtain strong agglomerated ore, and to effectively utilize manganese in the slag.

Claims (1)

[Scope of Claims] 1. Granulation into pellets or briquettes of metal oxide-containing ore containing 3 to 15% by weight of medium-low carbon ferromanganese slag or a slag compound having a similar composition as a binder. A method for producing uncalcined agglomerate ore, which is characterized by performing a hardening treatment with a gas containing 3% by volume or more of CO_2 and water vapor. 2 Pelletized ore containing metal oxides prepared by adding 3 to 15% by weight of Portland cement to medium-low carbon ferromanganese slag or a slag mixture with a similar composition as a binder. A method for producing uncalcined agglomerated ore, which comprises granulating and performing a wet atmosphere treatment, followed by hardening treatment with a gas containing 3% by volume or more of CO_2 and water vapor.