CN101723686A - Smoke-free micro-expansive anhydrous stemming - Google Patents

Abstract

The invention discloses smoke-free micro-expansive anhydrous stemming, comprising the following components in parts by weight: 10-30 parts of corundum, 15-25 parts of alumina, 10-20 parts of silicon carbide, 10-25 parts of coke, 15-25 parts of clay, 5-10 parts of expanding agent and 15-18 parts of phenolic resin binder. The invention has the advantages that: in the stemming using process, yellow smoke is not generated, pungent smell is less, and the used phenolic resin binder has higher curing temperature and can meet the use requirements of the stemming. Because the expanding agent is added, the stemming can generate micro-expansion at the high temperature so as to fill cracks generated due to inside and outside stresses and modify the high temperature using performance of the stemming.

Description

Smoke-free micro-expansive anhydrous stemming

Technical field

The present invention is a kind of smoke-free micro-expansive anhydrous stemming that is applicable to that large-scale iron-smelting blast furnace iron notch is used.

Background technology

Stemming is one of most important expendable material in the operation of blast furnace, and its effect is when blast furnace is not slagged tap ferrous solution, is filled in the iron mouth, makes the iron mouth keep enough degree of depth; During blast furnace casting, the stemming in the iron mouth bores and opens, and scum solution passing hole channel discharges out of the furnace, every day, the iron notch of blast furnace all will be by repeated open and filling, it is 1800 tons of/blast furnaces that China consumes stemming every year, more than 3000 in the existing blast furnace of China, and the stemming demand is more than 5,000,000 tons/year.

The feature of environmental protection of stemming is mainly reflected in the selection to wedding agent.At present, waterless taphole mix for blast furnace taphole mainly is that coal tar is made wedding agent both at home and abroad, this stemming in use can produce a large amount of tobacco, polynuclear aromatics (being called for short PAH) as tar and bituminous main component is identified as carcinogenic substance, its content in coal tar bonded stemming can reach 3%, produce and use in the pollution that causes can't solve always, and severe contamination environment.Along with the continuous enhancing of people's environmental consciousness, press for a kind of low toxicity even nontoxic wedding agent substitutes.

Because red-hot molten iron and solution flow out from the iron mouth, make stemming bear high temperature more than 1500 ℃ when tapping a blast furnace.When scum has gone out, with stemming stifled iron notch again.The new stemming that the contact of old stemming is blocked up, temperature drop to 100 ℃ from 1500 ℃ suddenly, act on so repeatedly that old stemming cover is inner to produce huge thermal stresses, and easily generation is the circular arc tiny crack in the center of circle with the iron mouth.On the contact surface of new and old stemming, also can shrink and produce the slit, so just make fused slag iron liquid easily infiltrate in these slits, when next iron mouth is opened, wash away down, make the stemming damage that comes off at molten stream intensive owing to the sintering of new stemming.In addition, newly blocked stemming is subjected to the effect of iron mouth internal and external temperature, the stemming sintering rate is not waited, in stemming, produce thermal stresses, tiny crack and expansion gradually occur, if disconnected iron lip reflex, will appear to whole Tie Kou cross section in crack propagation, can seriously have influence on taps a blast furnace produces and operation.

Summary of the invention

The present invention proposes a kind of smoke-free micro-expansive anhydrous stemming.

Smoke-free micro-expansive anhydrous stemming of the present invention comprises following component and content according to the mass fraction:

10～30 parts in corundum

15～25 parts in alumina

10～20 parts in silicon carbide

10～25 parts in coke

15～25 parts of clays

5～10 parts of swelling agents

15～18 parts of phenolic resin binders.

Described phenolic resin binder is the higher phenolic resin binder of solidification value.

Action principle of the present invention: clay is to adjust the indispensable plastic agent of stemming plasticity-.Coke has the void content height, heat conduction and good conductivity, and loading texturing temperature height, anti-slag, heat-shock resistance are stablized, and make stemming in use keep reducing atmosphere, and silicon carbide, carbonization network, carbon material are shielded.Added swelling agent, can make stemming at high temperature produce microdilatancy.

The invention has the beneficial effects as follows: stemming in use can not produce tobacco, and irritating smell is also very little, and the phenolic resin binder that uses has higher solidification value, can satisfy the service requirements of stemming.Owing to also added swelling agent in the present invention, can make stemming at high temperature produce microdilatancy, fill the crackle that produces owing to interior external stress thereby play, improve the high temperature use properties of stemming.Its performance comparison experiment sees Table 1.

Traditional stemming of table 1 and smoke-free micro-expansive anhydrous stemming of the present invention contrast

Embodiment

Further specify the present invention below in conjunction with specific embodiment, following each embodiment only is used to the present invention is described but not limitation of the present invention.

The raw material of each embodiment of smoke-free micro-expansive anhydrous stemming of the present invention and listed by content, basic mechanical design feature index such as the table 2 of mass parts metering.

Each embodiment of table 2 and performance

The manufacture method of each embodiment is identical, and its method is as follows:

1, at first according to mass parts metered proportions in the table 2, take by weighing various refractory raw materials such as alumina, corundum, clay, silicon carbide, coke, swelling agent, standby in the bag of packing into after mixing.

2, mixed raw materials is poured into test with in the edge runner-wet mill, added an amount of phenolic resin binder mixed grind, mixed grind is about 30 minutes, wedding agent to raw material wetting evenly after, with stemming constant temperature to 50 ℃, measure horse summer value with Ma Xiayi, and record stemming temperature at that time.Just can be in the Standard Module of 40mm * 40mm * 160mm when having suitable plasticity-with its ramming process, and band mould baking, in electric furnace, bury charcoal thermal treatment after the demoulding, measure performance index such as anti-folding, compressive strength, line velocity of variation, volume density and apparent porosity according to the regulation in the national standard what 1000 ℃ and 1450 ℃ were carried out in test block.

Claims (2)

1. a smoke-free micro-expansive anhydrous stemming is characterized in that, comprises following component and content according to the mass fraction:

10～30 parts in corundum

15～25 parts in alumina

10～20 parts in silicon carbide

10～25 parts in coke

15～25 parts of clays

5～10 parts of swelling agents

15～18 parts of phenolic resin binders.

2. smoke-free micro-expansive anhydrous stemming as claimed in claim 1 is characterized in that, described phenolic resin binder is the higher phenolic resin binder of solidification value.