CN107502735A - A kind of iron ore low temperature sintering technology - Google Patents

Abstract

The invention discloses a kind of iron ore low temperature sintering technology, comprise the steps of：Step 1：After iron ore is broken, granularity accounts for more than 90% less than 8mm contents in Iron Ore Powder；Solid fuel selects coke powder, solvent selection quick lime, then three is uniformly mixed by quality dosing method, is mixed after being passed through vapor；Step 2：By wide belt feeder on sintering pallet uniform layer overlay bed material, then as round roller material distributing machine by step it is a kind of obtained by compound be layered on bed material, thickness of feed layer is 500 ~ 600mm；Step 3：Firing temperature is controlled at 1050 ± 50 DEG C, sintering maximum temperature control is between 1250 ~ 1270 DEG C, and more than 1100 DEG C of high-temperature time is in more than 6min；Step 4：After the completion of sintering, single roller is carried out to agglomerate and crushed, after cooling, product is sieved.The present invention strengthens the preparation of raw materials for sintering, improves the thickness of the bed of material, maximum temperature when reducing sintering, can effectively protect the cementing phase needle-like calcium carbonate of sintering deposit not to be destroyed, so as to substantially increase the quality of sintering deposit.

Description

A kind of iron ore low temperature sintering technology

Technical field

The present invention relates to a kind of iron ore low temperature sintering technology, applied to iron ore sintering field.

Background technology

Iron ore powder sintering, exactly particulate ferrous material and particulate fuel, particulate solvent are coordinated by a certain percentage, in Jia Shui Sintering feed is mixed and be granulation into, is added on agglomerating plant, igniting, air-supply, by high temperature caused by fuel combustion and a series of things Physicochemical changes, generating portion low melting point, and softens melting and produce a number of liquid phase, and iron mineral wetting is bonded Come, after cooling, become porous block product-sintering deposit of some strength, the cementing phase of sintering deposit using needle-like calcium carbonate as Main, iron ore mainly uses high temperature sintering in the market, and sintering temperature causes needle-like calcium carbonate to be changed into column more than 1300 DEG C Or decompose, quantity strongly reduces, ultimately results in sintering quality and be greatly reduced.

The content of the invention

It is above-mentioned to solve the problems, such as, the invention discloses a kind of iron ore low temperature sintering technology, comprise the steps of：

Step 1：After iron ore is broken, granularity accounts for more than 90% less than 8mm contents in Iron Ore Powder；Solid fuel selects coke powder, grain Coke powder content of the degree less than 3mm is 88 ~ 90%；Solvent selects quick lime, and quick lime content of the granularity less than 3mm accounts for more than 90%, Then three is uniformly mixed by quality dosing method, mixed after being passed through vapor；

Step 2：By wide belt feeder, uniform layer overlay bed material, bed material are fritter sintering deposit on sintering pallet, grain Spend for 10 ~ 20mm, bed material thickness in 25mm, then as round roller material distributing machine by step it is a kind of obtained by compound be layered on bed material On, thickness of feed layer is 500 ~ 600mm；

Step 3：Firing temperature is controlled at 1050 ± 50 DEG C, sintering maximum temperature control is between 1250 ~ 1270 DEG C, 1100 DEG C High-temperature time above is in more than 6min；

Step 4：After the completion of sintering, single roller being carried out to agglomerate and crushed, after cooling, product is sieved, granularity is in 10 ~ 20mm product is product, continues double sintering after the Product recycling less than 10mm.

Using the technical program, the beneficial effects of the invention are as follows：The present invention strengthens the preparation of raw materials for sintering, improves the bed of material Thickness, maximum temperature when reducing sintering, can effectively protect the cementing phase needle-like calcium carbonate of sintering deposit not to be destroyed, so as to carry significantly The high quality of sintering deposit.

Embodiment

In order that the technical means, the inventive features, the objects and the advantages of the present invention are easy to understand, tie below Specific embodiment is closed, the present invention is expanded on further.

The invention discloses a kind of iron ore low temperature sintering technology, comprise the steps of：

Step 1：After iron ore is broken, granularity accounts for more than 90% less than 8mm contents in Iron Ore Powder；Solid fuel selects coke powder, grain Coke powder content of the degree less than 3mm is 88 ~ 90%；Solvent selects quick lime, and quick lime content of the granularity less than 3mm accounts for more than 90%, Then three is uniformly mixed by quality dosing method, mixed after being passed through vapor；

Step 2：By wide belt feeder, uniform layer overlay bed material, bed material are fritter sintering deposit on sintering pallet, grain Spend for 10 ~ 20mm, bed material thickness in 25mm, then as round roller material distributing machine by step it is a kind of obtained by compound be layered on bed material On, thickness of feed layer is 500 ~ 600mm；

Step 3：Firing temperature is controlled at 1050 ± 50 DEG C, sintering maximum temperature control is between 1250 ~ 1270 DEG C, 1100 DEG C High-temperature time above is in more than 6min；

Step 4：After the completion of sintering, single roller being carried out to agglomerate and crushed, after cooling, product is sieved, granularity is in 10 ~ 20mm product is product, continues double sintering after the Product recycling less than 10mm.

Finally it should be noted that：Above example only not limits technology described in the invention to illustrate the present invention Scheme；Therefore, although this specification with reference to above-mentioned each embodiment to present invention has been detailed description, this Field it is to be appreciated by one skilled in the art that still can be modified to the present invention or equivalent substitution；And all do not depart from this The technical scheme of the spirit and scope of invention and its improvement, it all should cover in scope of the presently claimed invention.

Claims (1)

1. a kind of iron ore low temperature sintering technology, it is characterised in that comprise the steps of：

Step 1：After iron ore is broken, granularity accounts for more than 90% less than 8mm contents in Iron Ore Powder；Solid fuel selects coke powder, grain Coke powder content of the degree less than 3mm is 88 ~ 90%；Solvent selects quick lime, and quick lime content of the granularity less than 3mm accounts for more than 90%, Then three is uniformly mixed by quality dosing method, mixed after being passed through vapor；

Step 2：By wide belt feeder, uniform layer overlay bed material, bed material are fritter sintering deposit on sintering pallet, grain Spend for 10 ~ 20mm, bed material thickness in 25mm, then as round roller material distributing machine by step it is a kind of obtained by compound be layered on bed material On, thickness of feed layer is 500 ~ 600mm；

Step 3：Firing temperature is controlled at 1050 ± 50 DEG C, sintering maximum temperature control is between 1250 ~ 1270 DEG C, 1100 DEG C High-temperature time above is in more than 6min；

Step 4：After the completion of sintering, single roller being carried out to agglomerate and crushed, after cooling, product is sieved, granularity is in 10 ~ 20mm product is product, continues double sintering after the Product recycling less than 10mm.