Utilization method of acid remelted iron powder

A technology for regenerating iron powder and iron scale with acid, applied in furnaces, furnace types, fluidized bed furnaces, etc., can solve the problems of environmental pollution metal yield and low cost, and achieve the effect of low cost and high efficiency

Inactive Publication Date: 2011-05-04
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to overcome the environmental pollution caused by direct smelting of acid-regenerated iron powder and the disadvantage

Method used

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  • Utilization method of acid remelted iron powder
  • Utilization method of acid remelted iron powder
  • Utilization method of acid remelted iron powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The embodiment of the method utilizing acid regenerated iron powder and iron scale to produce sponge iron is following successive steps:

[0027] (1) Mixing

[0028] Stir the acid regenerated iron powder and iron scale evenly according to the following mass ratio:

[0029] Acid Regenerated Iron Powder 40 Iron Scale 58 Coke Powder 6

[0030] Among them, the particle size of iron scale is ≤3mm, and the particle size of coke powder is ≤3mm;

[0031] Then add the binder of water 1 with a proportion of 4 by mass and mix evenly.

[0032] (2) Pressure ball

[0033] The above-mentioned mixed material is sent into a cake press machine with a belt, and is extruded into a cake under a pressure of 25MPa, (the cake diameter is 15cm, and the thickness is 5cm). The cake is naturally maintained for 3 days.

[0034] (3) into the kiln smelting

[0035] Put the pressed cake into the tank, fill and seal the material tank with coke, keep warm for 8 hours at 1300°C±10°C, cool for 6 hour...

Embodiment 2

[0042] The embodiment of the method utilizing acid regenerated iron powder and iron scale to produce sponge iron is following successive steps:

[0043] (1) Mixing

[0044] Stir the acid regenerated iron powder and iron scale evenly according to the following mass ratio:

[0045] Acid Regenerated Iron Powder 50 Iron Scale 45 Coke Powder 5

[0046] Among them, the particle size of iron scale is ≤3mm, and the particle size of coke powder is ≤3mm;

[0047] Then add the binder of water 1 with a proportion of 5 by mass and mix evenly.

[0048] (2) Pressure ball

[0049] The above-mentioned mixed material is sent into a cake press machine with a belt, and is extruded into a cake under a pressure of 23MPa, (the cake diameter is 15cm, and the thickness is 5cm). The cake is naturally maintained for 3 days.

[0050] (3) into the kiln smelting

[0051] Put the pressed cake into the tank, fill and seal the material tank with coke, keep warm for 8 hours at 1300°C±10°C, cool for 6 hour...

Embodiment 3

[0058] The embodiment of the method utilizing acid regenerated iron powder and iron scale to produce sponge iron is following successive steps:

[0059] (1) Mixing

[0060] Stir the acid regenerated iron powder and iron scale evenly according to the following mass ratio:

[0061] Acid Regenerated Iron Powder 50 Iron Scale 45

[0062] Among them, the particle size of iron scale is ≤3mm;

[0063] Then add the binder of water 2 with a proportion of 5 by mass and mix evenly.

[0064] (2) Pressure ball

[0065] The above-mentioned mixed material is sent into a cake press machine with a belt, and is extruded into a cake under a pressure of 30MPa, (the cake diameter is 15cm, and the thickness is 5cm) and the cake is naturally maintained for 3 days.

[0066] (3) into the kiln smelting

[0067] Put the pressed cake into the tank, fill and seal the material tank with coke, keep warm for 8h at 1300°C±10°C, cool for 6h, cool down to 200°C±10°C to form sponge iron, and leave the kiln....

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Abstract

The invention relates to a utilization method of acid remelted iron powder, which sequentially comprises the following steps of: (1) mixing materials: uniformly stirring 30-50 parts by mass of acid remelted iron powder, 50-70 parts by mass of iron scales and not more than 10 parts by mass of coke powder, adding 1-15 parts by mass of water and 3-5 parts by mass of binder humic acid, and uniformly mixing; (2) pressing cakes: sending the mixed material into a cake pressing machine by using a belt, extruding into pressed cakes under the pressure of 25+/-5 MPa, and baking or naturally airing the pressed cakes; and (3) delivering into a kiln: loading the pressed cakes in a pot, tamping the pot with coke, sealing the material pot, maintaining the temperature for 8+/-1 h at a temperature of 1300+/-100 DEG C, cooling for 6+/-1 h into sponge iron, and discharging out of the kiln. The utilization method of acid remelted iron powder has the advantages of low cost and high efficiency.

Description

technical field [0001] The invention relates to a utilization method of acid regenerated iron powder. Background technique [0002] With the continuous improvement of national environmental protection standards, iron and steel enterprises have vigorously promoted energy conservation and emission reduction, and reused various secondary resources in iron and steel enterprises, such as the recovery of waste acid after pickling of stainless steel. [0003] The by-product iron oxide powder (containing TFe 54%, Cr 8%, Ni 4.5%) after waste acid desiliconization is extremely fine in particle size, directly adding to electric furnace and other equipment will cause serious dust in the smelting process, and the utilization rate of acid regenerated iron powder is low. The metal yield is low, so it is difficult to use. However, if it is not used effectively, it will not only waste a lot of resources, but also cause serious environmental pollution. [0004] Therefore, how to use acid to...

Claims

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Application Information

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IPC IPC(8): C22B1/244C21B13/00
Inventor 叶文成史永林赵海泉李建军仪桂兰樊猛辉
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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