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Sponge iron ocntained nickle and its preparation process, process for producing nickle alloy steel blank

A technology of sponge iron and iron scale, which is applied in the production of nickel-containing sponge iron, the manufacture of nickel alloy billets, and the field of nickel-containing sponge iron, which can solve the problems of resource waste, environmental pollution, and large vacant space occupation, and reduce production costs , Save precious resources, reduce the effect of adding amount

Inactive Publication Date: 2005-06-08
李增元
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] On the one hand, the supply and demand of nickel, one of the important raw materials for the production of stainless steel, is tight all over the world; on the other hand, by-products such as flue dust, layer mud, and iron scale produced during the production of stainless steel in my country have not yet been produced. A suitable recycling method is piled up and discarded in large quantities, and cannot be recycled and reused
Pile up and discard these wastes, not only need to occupy a lot of free space, but also cause serious environmental pollution
Especially since these wastes contain about 1 to 4% of the precious metal nickel, as well as many other elements such as chromium, titanium, manganese, molybdenum, copper, niobium, phosphorus, etc., and these elements are used in the smelting of stainless steel If the elements that need to be added are discarded directly and not recycled, it will inevitably cause a great waste of resources, which is not conducive to the further development of my country's stainless steel industry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take the waste flue ash from smelting stainless steel, crush it to the required fineness, add an appropriate amount of water, put it into an extruder, and extrude it into a rough billet with a pressure of 0.2t.

[0025] Coal coke powder and limestone are pulverized into fine powder respectively, and mixed uniformly according to the weight ratio of 3:1 to make the reducing agent.

[0026] Put the extruded rough billet into the reduction tank, each tank is filled with 25Kg, and then add 6.5Kg of the above-mentioned reducing agent, fill the gap in the reduction tank, and add a cover.

[0027] Bring all the installed reduction tanks together into a tunnel kiln that has been heated to 1000°C and kept at a constant temperature. After roasting at a constant temperature for 6 hours, leave the kiln to cool, pour out the product from the reduction tank, and clean up the residual reducing agent attached to the surface. , to obtain nickel-containing sponge iron products.

[0028] ...

Embodiment 2

[0030] Take the waste flue ash and iron scale from smelting stainless steel, grind them to the required fineness respectively, mix them evenly according to the weight ratio of 6:4, add an appropriate amount of water, put them into an extruder, and extrude them with a pressure of 0.8t into a rough billet.

[0031] Coal coke powder and limestone are pulverized into fine powder respectively, and mixed uniformly according to the weight ratio of 5:1 to make the reducing agent.

[0032] Put the extruded rough billet into the reducing tank, and put 25Kg into each tank, then add 4Kg of the above-mentioned reducing agent, fill in the gap in the reducing tank, and add a cover.

[0033] Bring all the installed reduction tanks together into a tunnel kiln that has been heated to 1300°C and kept at constant temperature. After roasting at a constant temperature for 5 hours, leave the kiln to cool, pour out the product from the reduction tank, and clean up the residual reducing agent attached...

Embodiment 3

[0036] Take the waste iron scale from smelting stainless steel and stainless steel cutting slag, grind them to the required fineness respectively, mix them evenly according to the weight ratio of 7:3, add an appropriate amount of water, put them into an extruder, and extrude them with a pressure of 3t into a rough billet.

[0037] Coke powder and limestone are pulverized into fine powder respectively, and then mixed evenly according to the weight ratio of 5.5:1 to make the reducing agent.

[0038] Put the extruded rough billet into reduction tanks, each tank is filled with 25Kg, and then add 4.5Kg of the above-mentioned reducing agent, fill in the gaps in the reduction tank, and add a cover.

[0039] Bring all the installed reduction tanks together into a tunnel kiln that has been heated to 1350°C and kept at a constant temperature. After roasting at a constant temperature for 6 hours, leave the kiln to cool, pour out the product from the reduction tank, and clean up the resid...

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PUM

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Abstract

A process for preparing the Ni-contained sponge iron includes such steps as proportionally mixing the rejected substances generated by smelting stainless steel, such as flue ash, dust deposit and iron scale, die pressing, loading in reductor, adding reducing agent, and calcining at 1000-1500 deg.C. A process for preparing Ni-alloy steel billet from said sponge iron includes such steps as adding said Ni-contained sponge iron, ferrosilicon powder, lime stone powder, and carbon powder into electric arc furnace, and conventional smelting to obtain Ni-alloy steel billet sued to smelt stainless steel.

Description

Technical field [0001] The invention relates to sponge iron in iron and steel smelting, in particular to a nickel-containing sponge iron and a production method of the nickel-containing sponge iron. The invention also relates to a method for manufacturing a nickel alloy billet by utilizing the nickel-containing sponge iron. Background technique [0002] Nickel is an excellent corrosion-resistant material and an important alloying element in alloy steel, especially nickel is an element that forms austenite in steel and is an important part of stainless steel. [0003] With the large-scale development and application of nickel-based heat-resistant alloys and high-strength steels containing less than 20% nickel, and the rapid development of the chemical industry, the demand for stainless steel is increasing, and the demand for metal nickel is also increasing day by day, especially in China. The stainless steel industry is developing rapidly. In 2003, China's stainless steel co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/04C22C1/02C22C19/03
Inventor 李增元
Owner 李增元
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