CN103979976A - Blast-furnace high-quality waterless stemming prepared from coke-dry-quenching dedusting ash by grinding - Google Patents

Abstract

The invention provides blast-furnace high-quality waterless stemming prepared from coke-dry-quenching dedusting ash by grinding. The raw materials employ coke-dry-quenching dedusting ash with the water content less than 0.5%, and also the raw material compositions tar, sericite, high-temperature asphalt powder, brown corundum fine powder, brown corundum particles, kyanite and the like are controlled. The compositions for preparing the stemming comprise 40-50 parts of Al2O3, 25-30 parts of SiO2, 15-20 parts of SiC and 25 parts of dissociated C. The volume density of the stemming at 150 DEG C for 24 h is 2.1 g/cm<3>, and the linear change rate is -1%. The stemming is obtained by performing grinding fro 50+/-5 min by employing a stemming grinder, and the stemming is placed for 72 h for usage after being subjected to grinding molding; after blast-furnace casting is finished, a hydraulic stemming machine injecting the stemming into a taphole channel with the injection pressure of 25-30 MPa, after the taphole is blocked for 30 min, stemming separating is performed, and sintering is performed for 45 +/- 5 min, so that the requirement for another-time casting is satisfied.

Description

A kind of blast furnace high-quality anhydrous stemming that utilizes dry coke quenching dedusting ash to grind system

Technical field

The present invention relates to blast furnace iron-making process, especially after tapping a blast furnace, block the method for iron mouth with stemming, it is rigid that the stemming of development has speed, the feature that volume stability is good.

Background technology

At present blast furnace stifled iron notch all adopts anhydrous stemming substantially, in anhydrous stemming use procedure, conventionally all exist stemming not the iron of resistance to slag wash away, grind and make highly, the splash of iron mouth, causes the problems such as environmental pollution accident.

Utilize dry coke quenching dedusting ash as grinding the raw material of making without stemming, turn waste into wealth, emphasis grinds the moisture content of mud raw material and starts with from adjusting stemming formula and control, requirement coke powder moisture content must be lower than 0.5%, tradition stone roller technique processed has been used the coke powder of 1-3mm, its moisture reaches as high as 5%, and dry coke quenching dedusting ash is almost anhydrous, solve well because of the exceed standard problem of the iron mouth splash causing of raw material moisture content, eliminate the dust pollution that tapping outlet operation causes, in addition for to prevent that meticulous coke powder dedusting ash is unfavorable for opening, suitably strengthen the amount of the bauxites aggregate that refractoriness is high, reduce the high silicon carbide consumption of finding it difficult to bring the matter up of price.

High-quality anhydrous stemming prepared by the present invention, the speed of use rigid good, opening performance is good, volume stability, grinds and makes lowly, has important production promotional value.

Summary of the invention

The object of the invention is to: the novel environment friendly providing, efficient, low cost anhydrous stemming, guarantee that blast furnace casting safety is smooth and easy.

The object of the present invention is achieved like this: a kind of blast furnace high-quality anhydrous stemming that utilizes dry coke quenching dedusting ash to grind system, implement step by step;

Step 1 stemming raw material: select dry coke quenching dedusting ash, its water content is less than 0.5%;

Wherein material composition control criterion:

Tar: moisture≤1%, C content >=80%, density 1.15-1.21, viscosity≤5;

Sericite: refractoriness 1320-1480 DEG C, SiO ₂71-77%, water < 2%, Al ₂o ₃14-18%, Fe ₂o ₃< 1.1%, K ₂o < 4%, granularity 200 orders;

Hard pitch powder: C content > 75%, ash < 0.4%, 125 DEG C of softening temperature >, granularity 60-150 order;

Palm fibre corundum fine powder: Al ₂o ₃>=92%, CaO≤0.45%, granularity 180 orders;

Palm fibre corundum in granules: Al ₂o ₃>=95%, CaO < 0.45%, granularity 1-3mm;

Silicon carbide: SiC > 92%, granularity 0.01-100 order;

Kyanite: Al ₂o ₃> 58%, Fe ₂o ₃< 0.8%, TiO ₂< 1.5%, K ₂o+Na ₂o < 0.3%, igloss≤1.5%, refractoriness>=1790 DEG C, moisture≤1%, granularity 80-100 order;

Step 2 is ground stemming processed:

The component of stemming: Al ₂o ₃40-50 part, SiO ₂25-30 part, SiC15-20 part, free C are 25 parts; Wherein volume density is 150 DEG C, 24h, 2.1g/cm ³, line velocity of variation-1%; Adopt pug mill to grind stemming processed, time 50 ± 5min, grinds after the type of making is placed 72h and uses;

The use of step 3 stemming: blast furnace casting finishes, squeezes into iron mouth passage with Hydraulic clay gun machine by stemming, beats mud pressure 25-30MPa, and after blocking up, 30min moves back big gun, sintering, and time 45 ± 5min, meets the requirement of again tapping a blast furnace.

Mechanism of the present invention and effect: emphasis grinds the moisture content of mud raw material and starts with from adjusting stemming formula and control; in addition for to prevent that meticulous coke powder dedusting ash is unfavorable for opening; the amount that suitably strengthens the bauxites aggregate that refractoriness is high, reduces the high silicon carbide consumption of finding it difficult to bring the matter up of price; The dry coke quenching dedusting ash of selecting is replaced macrobead coke powder, becomes Fei Weibao, has reduced the stone roller of stemming and make this in the quality that promotes stemming, shows technical progress.

Embodiment

The present invention is described further in conjunction with the embodiments.

Embodiment

This product is applicable to the blast furnace of 450-2500 volume.

1) replace coke powder by dry coke quenching dedusting ash, strictly control coke powder moisture content below 0.5%;

Its raw material quality control index is as follows:

Tar: moisture≤1%, C content >=80%, density 1.15-1.21, viscosity≤5;

Sericite: refractoriness 1320-1480 DEG C, SiO ₂71-77%, water < 2%, Al ₂o ₃14-18%, Fe ₂o ₃< 1.1%, K ₂o < 4%, granularity 200 orders;

Hard pitch powder: C content > 75%, ash < 0.4%, 125 DEG C of softening temperature >, granularity 60-150 order;

Palm fibre corundum fine powder: Al ₂o ₃>=92%, CaO≤0.45%, granularity 180 orders;

Palm fibre corundum in granules: Al ₂o ₃>=95%; CaO < 0.45%; Granularity 1-3mm;

Silicon carbide: SiC > 92%; Granularity 0.01-100 order;

Kyanite: Al ₂o ₃> 58%; Fe ₂o ₃< 0.8%; TiO ₂< 1.5%; K ₂o+Na ₂o < 0.3%; Igloss≤1.5%; Refractoriness>=1790 DEG C; Moisture≤1%; Granularity 80-100 order.

2) bauxites aggregate that adjustment refractoriness is high and the consumption of silicon carbide, suitably strengthen the one-level bauxites aggregate consumption that refractoriness is high, reduces the consumption of the high silicon carbide of finding it difficult to bring the matter up of price, guarantees stemming high-temperature behavior, prepares stemming component as follows:

Component 1:Al ₂o ₃40 parts, SiO ₂25 parts, SiC15 part, free C25 part;

Component 2:Al ₂o ₃50 parts, SiO ₂30 parts, SiC20 part, free C25 part;

Component 3:Al ₂o ₃45 parts, SiO ₂27.5 parts, SiC17.5 part, free C25 part;

The volume density of above-mentioned stemming is 150 DEG C, 24h, 2.1g/cm ³, line velocity of variation-1%.

3) select above-mentioned 2) in component 1,2,3 arbitrary groups: adopt pug mill to grind stemming processed, grinds the time processed to be controlled at 50 ± 5min, stone roller is made after type placement 72h, uses for blast furnace.

4) blast furnace, tapping a blast furnace after end, is enabled Hydraulic clay gun machine stemming is squeezed into iron mouth passage, requires to beat mud pressure at 28MPa, and after blocking up, 30min moves back big gun, and sintering, time 45 ± 5min, can meet the requirement of again tapping a blast furnace.

5) production effect checking

Since grinding anhydrous stemming processed since in April, 2009 by dry coke quenching dedusting ash, eight steel blast furnace taphole qualification rates significantly promote, iron notch portion index General Promotion, and by contrast, 800 yuan of anhydrous stemming ton mud costs are per ton, economic benefit highly significant.

Claims (1)

1. utilize dry coke quenching dedusting ash to grind a blast furnace high-quality anhydrous stemming for system, it is characterized in that: implement step by step;

Step 1 stemming raw material: dry coke quenching dedusting ash, its water content is less than 0.5%;

Wherein material composition control criterion:

Tar: moisture≤1%, C content >=80%, density 1.15-1.21, viscosity≤5;

Sericite: refractoriness 1320-1480 DEG C, SiO ₂71-77%, water < 2%, Al ₂o ₃14-18%, Fe ₂o ₃< 1.1%, K ₂o < 4%, granularity 200 orders;

Hard pitch powder: C content > 75%, ash < 0.4%, 125 DEG C of softening temperature >, granularity 60-150 order;

Palm fibre corundum fine powder: Al ₂o ₃>=92%, CaO≤0.45%, granularity 180 orders;

Palm fibre corundum in granules: Al ₂o ₃>=95%, CaO < 0.45%, granularity 1-3mm;

Silicon carbide: SiC > 92%, granularity 0.01-100 order;

Kyanite: Al ₂o ₃> 58%, Fe ₂o ₃< 0.8%, TiO ₂< 1.5%, K ₂o+Na ₂o < 0.3%, igloss≤1.5%, refractoriness>=1790 DEG C, moisture≤1%, granularity 80-100 order;

Step 2 is ground stemming processed:

The component of stemming: Al ₂o ₃40-50 part, SiO ₂25 parts of 25-30 part, SiC 15-20 part, free C, wherein volume density is 150 DEG C, 24h, 2.1g/cm ³, line velocity of variation-1%; Stemming adopts pug mill to grind system, and time 50 ± 5min grinds after the type of making is placed 72h and uses;

The use of step 3 stemming: blast furnace casting finishes, squeezes into iron mouth passage with Hydraulic clay gun machine by stemming, beats mud pressure 25-30MPa, and after blocking up, 30min moves back big gun, sintering, and time 45 ± 5min, meets the requirement of again tapping a blast furnace.