JPS58133334A - Preparation of non-sintered finished briquette - Google Patents

Abstract

PURPOSE:To prepare a strong non-sintered finished briquette rapidly and inexpensively, by a method wherein intermediate and low carbon ferromanganese slag is added to metal oxide as a binder and the obtained mixture is granulated to be subjected to hardening treatment by a CO2-gas. CONSTITUTION:Intermediate and low carbon ferromanganese slag or a slag compound having a composition similar thereto is added to metal oxide such as a powdery ore in an amount of 3-15% as a binder and a small amount of water is added to the resulting mixture to granulate the same into a pellet or a briquette form. The obtained granule is subjected to hardening treatment by a gas containing 3% or more CO2 to rapidly advance lump formation to obtain a massive ore with high compression strength. In addition, in order to obtain the finished briquette with high compression strength, it is pref. that the granule obtained by adding Portland cement to the aforementioned binder is treated under a wet atmosphere and the treated granule is subjected to hardening treatment by the gas containing 3% or more CO2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to (1) a method for producing rounded uncalcined agglomerate ore by charging fine ore into a metal smelting furnace as a raw material, in which agglomeration is performed quickly; The object of the present invention is to provide a production method that can produce strong agglomerated ore.

Conventionally, it has been preferable to use fine ore as the raw material for charging a metal smelting furnace into unfired agglomerate ore from the viewpoint of pollution-free and energy saving, and many methods for producing this unfired agglomerate have been proposed. ing.

As an example, a carbonation granulation method using slaked lime as a binder and carbonized calcium bond produced by reacting with 00W gas <*8 No. 1973-H'024, Hours 1I8
No. 54-25887, Special Publication No. 53-41694, 1?
25613/1986, 45714/1972), the proposal was made by mixing hydraulic cement and slaked lime as a binder, hardening by water use and hardening by vertical oxidation. The friend method (JP-A-52-56)
10) 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. 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 to have a rapid carbonation reaction and a strong bond. New manufacturing methods, especially new ones.

There was a demand for the development of a suitable binder.

As a result of extensive research to meet the above requirements, the inventors have developed a method for bonding non-calcined agglomerates with medium- and low-carbon ferro-onganes, which have a rapid carbonation reaction, provide a strong bond, and are inexpensive. The present invention was developed based on the knowledge that by using KC (h gas) as a hardening agent, agglomeration can be carried out quickly and a strong agglomerated ore can be obtained.

That is, in the present invention, a medium-low carbon ferromanganese slag or a slag compound having a similar composition tWi is added as a mixture of metal oxides for 3 to 15 seconds, and the metal oxides are granulated into briquettes containing COmt5- or more. The 211th invention of the present invention is based on a method for producing non-calcined agglomerate characterized by performing hardening treatment with a gas, and the 211th invention of the present invention is a method for producing non-calcined agglomerated ore characterized by performing a hardening treatment with a gas. Gold Jilt oxide with 3-15% of Portland cement added as a binder is granulated into pellets or briquettes, and after wet atmosphere treatment, a slag composition containing Cot k 54 or more is prepared. This is a method for producing uncalcined agglomerate ore, which is characterized by performing hardening treatment using gas.

In the present invention, the reason for adding a medium-low carbon ferromanganese slag or a slag composition having a similar composition as a binder is as shown in Example 1 below. This is because the crushing strength of the subsequent agglomerate ore is high, the carbonation reaction is relatively fast, it is excellent as a binder, and it is inexpensive.

In the second aspect of the present invention, the reason for adding medium-low carbon ferromanganese slag plus Portland cement as a binder is that, as shown in Example 2 below, these components are used in combination, Wet atmosphere treatment and CO
This is due to the fact that those which are subjected to both the curing treatment and the curing treatment using a gas containing m t have a higher crushing strength and are excellent as binders.

In the present invention, the addition ratio of the binder is set at 5 to 15. If the ratio is less than 5, the binding effect is insufficient and crushing strength cannot be achieved, and if it exceeds 1S*t, the original purpose of the binder is
This is because the crushing strength is saturated, and the crushing strength is saturated.

Next, an embodiment of the present invention will be shown in comparison with a conventional example to supplement the explanation of the present invention.

Implementation N1: A sample was prepared by mixing 10- with manganese ore using medium carbon ferromanganese slag as a binder, adding 7 ml of water, and granulating it into pellets of 14±1 ml+- using a 1 m pelletizer. And so. 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, Cot gas containing about 20% of water vapor was used, and 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 the slaked lime slag conventionally used as a binder for carbonation reactions, and the binder It is excellent as.

Example 2: Using the same finely divided manganese ore as in Example 1 as a raw material, 5 ounces of medium carbon ferromanganese slag and 5 ounces of Portland cement were used.
It was blended as an St-binder and granulated into pellets with the same specifications using the same method as in Example 1 to obtain a good t sample. This sample was hydrated by being held at 65° C. in a humid atmosphere for 5 hours, and then kept in the same reaction gas at the same temperature conditions as in Jlli Example 1 for 4 hours.

For comparison, 10 grams of Portland cement was mixed as a binder, granulated into pellets with the same specifications using the same method as above, and then cured at 65°C for 9 hours with water only, and the same pellets as above. Comparative samples were obtained by holding the samples under carbonation treatment conditions for 9 hours.

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

Table 2 As is clear from Table 2, when medium carbon ferromanganese slag and Portland cement used in the present invention are blended as a binder, the following treatment is performed after both hydration and carbonation treatment t1. A higher crushing strength was obtained than that using only Boltland cement as a binder, and it was confirmed that this product is an excellent binder.

Example 3: 8101 and MnO were added to the converter slag, and Mn01Sl
oz and CaO in a molar concentration ratio of 1:1:1, cooled, crushed, and used as a binder.
was mixed with finely powdered manganese ore and granulated into pellets with the same specifications using the same method as in Example 1.Nine samples were used, and the carbonation reaction was performed on this sample under the same conditions as in Example 1. I made it. The crush strength ft#J of 22 pellets after the reaction was determined and the average value was determined to be 1599/p.

As shown in the examples above, according to the method for producing non-calcined agglomerates of the present invention, a cost-effective medium-low carbon ferromanganese or a slag metal alloy having a composition similar to this is used as a binder. The agglomeration is carried out quickly and strong agglomerate ore can be obtained. In addition, in the above example, an example of uncalcined agglomerate to which a reducing agent such as coke powder was added was not shown; do not have.

Agent: Patent Attorney Masatoshi Sato Same as Saburo Kimura Same Same as Souji Sasaki

Claims (2)

[Claims] (1) Using medium-low carbon ferromanganese slag or a slag blend having a similar composition as a binder,
15 Added metal oxide into pellets
A method for producing non-calcined agglomerate ore, which comprises granulating K and hardening with a gas containing 5% or more of CO. (2) Medium-low carbon ferromanganese slag or a slag mixture with a similar composition to which 3 to 15 grams of Portland cement is added as a binder is added to form a metal oxide, which is then granulated into pellets or briquettes, and wet-processed. A method for producing uncalcined agglomerate ore, which comprises performing atmospheric treatment and then hardening treatment with a gas containing at least 5 capsules of CO3t'5.