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Sponge iron for furnace charge and its manufacturing method

A technology of sponge iron and charge, applied in fluidized bed furnaces and other directions, can solve the problems of increasing the variety of steel, unable to exert the quality of sponge iron, and achieve the effect of reducing the number of charging times, reducing the amount of industrial waste, and weakening the secondary oxidation.

Inactive Publication Date: 2006-01-11
张和起
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It cannot reflect the man-made advantages of sponge iron, let alone give full play to the advantages of sponge iron to improve the quality of steel and increase the variety of steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of sponge iron for charge, its composition and weight content are as follows:

[0023] Concentrate powder 90% of total iron content 67%,

[0024] Additive 10%,

[0025] The composition and weight content of the additive are as follows:

[0026] Toner 80% with less than 2 parts per thousand sulfur,

[0027] Na 2 CO 3 10%,

[0028] NaCl 10%,

[0029] Mix the above three powders and serve:

[0030] The manufacturing method of sponge iron is as follows:

[0031] 1. Concentrate powder and additives are mixed and formed by pressing;

[0032] 2. The molded products are filled into a 50-meter tunnel kiln, and run at a speed of 2M / hour under the condition of 1250°C, and the kiln is ready.

Embodiment 2

[0034] A kind of sponge iron for charge, its composition and weight content are as follows:

[0035] 98% concentrate powder with 68.8% total iron content,

[0036] Additive 2%,

[0037] The composition and weight content of the additive are as follows:

[0038] Toner 90% with less than two thousandths of sulfur,

[0039] Na 2 CO 3 7%,

[0040] NaCl 3%,

[0041] Mix the above three powders and serve.

[0042] How to make sponge iron:

[0043] 1. The concentrate powder and additives are mixed and formed through hardness;

[0044] 2. The formed main product is filled into a 60-meter tunnel kiln, and run at a speed of 2.5 m / h under the condition of 1150 ° C, and it is ready when it comes out of the kiln.

Embodiment 3

[0046] A kind of sponge iron for charge, its composition and weight content are as follows:

[0047] 95% concentrate powder with 68% total iron content,

[0048] Additive 5%,

[0049] The composition and weight content of the additive are as follows:

[0050] Toner 70% with less than two thousandths of sulfur,

[0051] Na 2 CO 3 25%,

[0052] CaF 2 5%,

[0053] Mix the above three powders and serve.

[0054] How to make sponge iron:

[0055] 1. The concentrate powder and additives are mixed and formed by pressing.

[0056] 2. The molded products are filled into a 60-meter tunnel kiln, and run at a speed of 2 meters per hour under the condition of 1280 ° C, and the kiln is ready.

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PUM

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Abstract

A spongy iron for burden is proportionally prepared from the iron ore concentrate powder with iron content more than 66%, or iron scales and spongy iron additive prepared proportionally from carbon powder, carbonate of alkali metal or alkali-earth metal and the halide of alkali metal or alkali-earth metal.

Description

Technical field: [0001] The invention belongs to raw materials for steelmaking, and in particular relates to a sponge iron used for furnace charges and a manufacturing method thereof. Background technique: [0002] The existing sponge iron production process is: after artificial filling or forming of iron-based raw materials (concentrated ore powder or iron scale), it is reduced at high temperature in a tunnel kiln or a rotary kiln to make a product. The sponge iron products produced by this process not only have high energy consumption and high pollution, but more importantly, the products produced have low density, low metallization rate, high melting point, and are easily secondary oxidized in the high-temperature smelting process, which seriously affects Metal recovery. Not suitable for use as metallurgical charge. Can not embody the man-made advantage of sponge iron, more can't bring into play sponge iron to improve steel quality, increase the advantage of steel produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C22B1/14
Inventor 张和起张玉立张立伟张立德
Owner 张和起
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