Preparation method of low-temperature solidified metallurgical pellets

Abstract

The invention belongs to the field of comprehensive utilization of metallurgical residue resources and specifically relates to a preparation method of low-temperature solidified metallurgical pellets.In order to solve the problems that when steel and iron scrap powder are adopted for making pellets, the generated pellets are poor in forming performance, low in sintering intensity, likely to be pulverized and the like. The provided preparation method of the low-temperature solidified metallurgical pellets includes the following steps of a, taking and weighing vanadium titano-magnetite concentrates, steel and iron scraps and a compound bonding agent according to a mass ratio of (28-65):(34-68):(2-4), adding water, uniformly mixing the mixture, and conducting pelleting to obtain raw pellets;b, drying the raw pellets obtained in step a until the moisture content is lower than or equal to 1%, and obtaining dry pellets; c, preheating the dry pellets and conducting sintering to obtain finished pellet products. The preparation method is simple in operation, the prepared pellet products are high in strength, MFe of the finished pellet products is 55-58%, the compressive strength of each pellet is 2,600-3,100 N, the drum index is 90.0-93.5%, and the production cost is low. The new method is provided for comprehensive utilization of the steel and iron scrap powder, and obvious economicbenefits are obtained.

Description

technical field

[0001] The invention belongs to the field of comprehensive utilization of metallurgical slag resources, in particular to a method for preparing low-temperature solidified metallurgical pellets. Background technique

[0002] Metallurgical slag is an inevitable by-product in the process of iron and steel smelting. Slag steel slag iron refers to the wrapped iron and steel materials in the process of iron and steel smelting slag. After the molten metallurgical slag is cooled by water, it is selected by the method of "crushing + ball milling + magnetic separation" Iron-containing materials whose metallic iron content is 50-60% in MFe and particle size is 0-3mm. After iron-containing materials are selected, tailings (containing less than 2% metallic iron) are generally used as building materials. The metallic iron in slag-steel slag-iron has a fine particle size and is wrapped in slag-iron, making it difficult to separate. Currently, it is mainly used as a raw mat...

Examples

preparation example Construction

[0028] The invention provides a method for preparing low-temperature consolidated metallurgical pellets, comprising the following steps:

[0029] a. Weigh vanadium-titanium-magnetite concentrate, slag steel slag iron, and composite binder according to the mass ratio of 28-65:34-68:2-4, add water, mix well, and press balls to obtain raw ball;

[0030] b. drying the green balls obtained in step a until the water content is ≤1%, to obtain dry balls;

[0031] c. Preheating and sintering the dry pellets to obtain finished pellets.

[0032] Wherein, in the preparation method of the above-mentioned low-temperature consolidation metallurgical pellets, the composition of the vanadium-titanium-magnetite concentrate described in step a is: by weight percentage, TFe 55-57%, SiO 2 3~3.5%, FeO 25~30%, TiO 2 2.7~10.9%, V 2 o 5 0.3-0.6%, the balance is unavoidable impurities.

[0033] Further, in order to better prepare into pellets, the particle size of the vanadium-titanium magnetite...

Embodiment 1

[0061] Example 1 Preparation of low-temperature consolidated vanadium-titanium pellets by the method of the present invention

[0062] Include the following steps:

[0063] (1) Composite binder according to 60wt% sodium bentonite, 6.5wt% lightly burned dolomite, 30wt% solid sodium silicate powder, 0.5wt% carboxymethyl cellulose, 2.0wt% polyvinyl alcohol, modifier 1.0wt% ratio was weighed. The modifying agent includes: 10 parts by weight of potassium permanganate and 90 parts by weight of fluorite. After weighing according to the proportion, put it into a high-speed mixer for mixing. When the material is uniform, discharge it, seal it with a packaging machine, and set it aside. The weighed polyvinyl alcohol (PVA for short) is placed separately for future use.

[0064] (2) Put the weighed PVA into an appropriate amount of room temperature water, stir slowly, and heat to about 80°C until the PVA is completely melted. spare.

[0065] (3) Weigh slag steel slag iron, vanadium-t...

Embodiment 2

[0069] Example 2 Preparation of low-temperature consolidated vanadium-titanium pellets by the method of the present invention

[0070] Include the following steps:

[0071] (1) Composite binder is according to 45wt% sodium bentonite, 2.0wt% lightly burned dolomite, 50wt% solid sodium silicate powder, 0.7wt% carboxymethyl cellulose, 1.5wt% polyvinyl alcohol (PVA for short) , the modifier is weighed in proportion of 0.8wt%. Wherein, the modifying agent includes: 8 parts by weight of potassium permanganate, 25 parts by weight of sodium fluorosilicate, and 67 parts by weight of fluorite. After weighing according to the proportion, put it into a high-speed mixer for mixing. When the material is uniform, discharge it, seal it with a packaging machine, and set it aside. The weighed polyvinyl alcohol (PVA for short) is placed separately for future use.

[0072] (2) Put the weighed PVA into an appropriate amount of room temperature water, stir slowly, and heat to about 80°C until th...

technical field

[0001] The invention belongs to the field of comprehensive utilization of metallurgical slag resources, in particular to a method for preparing low-temperature solidified metallurgical pellets. Background technique

[0002] Metallurgical slag is an inevitable by-product in the process of iron and steel smelting. Slag steel slag iron refers to the wrapped iron and steel materials in the process of iron and steel smelting slag. After the molten metallurgical slag is cooled by water, it is selected by the method of "crushing + ball milling + magnetic separation" Iron-containing materials whose metallic iron content is 50-60% in MFe and particle size is 0-3mm. After iron-containing materials are selected, tailings (containing less than 2% metallic iron) are generally used as building materials. The metallic iron in slag-steel slag-iron has a fine particle size and is wrapped in slag-iron, making it difficult to separate. Currently, it is mainly used as a raw mat...

Examples

preparation example Construction

[0028] The invention provides a method for preparing low-temperature consolidated metallurgical pellets, comprising the following steps:

[0029] a. Weigh vanadium-titanium-magnetite concentrate, slag steel slag iron, and composite binder according to the mass ratio of 28-65:34-68:2-4, add water, mix well, and press balls to obtain raw ball;

[0030] b. drying the green balls obtained in step a until the water content is ≤1%, to obtain dry balls;

[0031] c. Preheating and sintering the dry pellets to obtain finished pellets.

[0032] Wherein, in the preparation method of the above-mentioned low-temperature consolidation metallurgical pellets, the composition of the vanadium-titanium-magnetite concentrate described in step a is: by weight percentage, TFe 55-57%, SiO 2 3~3.5%, FeO 25~30%, TiO 2 2.7~10.9%, V 2 o 5 0.3-0.6%, the balance is unavoidable impurities.

[0033] Further, in order to better prepare into pellets, the particle size of the vanadium-titanium magnetite...

Embodiment 1

[0061] Example 1 Preparation of low-temperature consolidated vanadium-titanium pellets by the method of the present invention

[0062] Include the following steps:

[0063] (1) Composite binder according to 60wt% sodium bentonite, 6.5wt% lightly burned dolomite, 30wt% solid sodium silicate powder, 0.5wt% carboxymethyl cellulose, 2.0wt% polyvinyl alcohol, modifier 1.0wt% ratio was weighed. The modifying agent includes: 10 parts by weight of potassium permanganate and 90 parts by weight of fluorite. After weighing according to the proportion, put it into a high-speed mixer for mixing. When the material is uniform, discharge it, seal it with a packaging machine, and set it aside. The weighed polyvinyl alcohol (PVA for short) is placed separately for future use.

[0064] (2) Put the weighed PVA into an appropriate amount of room temperature water, stir slowly, and heat to about 80°C until the PVA is completely melted. spare.

[0065] (3) Weigh slag steel slag iron, vanadium-t...

Embodiment 2

[0069] Example 2 Preparation of low-temperature consolidated vanadium-titanium pellets by the method of the present invention

[0070] Include the following steps:

[0071] (1) Composite binder is according to 45wt% sodium bentonite, 2.0wt% lightly burned dolomite, 50wt% solid sodium silicate powder, 0.7wt% carboxymethyl cellulose, 1.5wt% polyvinyl alcohol (PVA for short) , the modifier is weighed in proportion of 0.8wt%. Wherein, the modifying agent includes: 8 parts by weight of potassium permanganate, 25 parts by weight of sodium fluorosilicate, and 67 parts by weight of fluorite. After weighing according to the proportion, put it into a high-speed mixer for mixing. When the material is uniform, discharge it, seal it with a packaging machine, and set it aside. The weighed polyvinyl alcohol (PVA for short) is placed separately for future use.

[0072] (2) Put the weighed PVA into an appropriate amount of room temperature water, stir slowly, and heat to about 80°C until th...

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