CN101913882B - Method for producing long-service-life wear-resistant blast furnace tuyere ceramic lining - Google Patents

Abstract

The invention relates to a method for producing a wear-resistant ceramic lining, solving the problems of short service life, high temperature resistance, poor corrosion resistance, poor abrasion resistance and poor burning loss property of the traditional blast furnace tuyere lining. The ceramic lining is produced by adopting the technical scheme of dispensing, pulping, moulding, forming, drying, fettling, sintering and finishing raw materials, wherein the raw materials comprise the following components in parts by weight: 50-70 parts of silicon carbide, 20-30 parts of simple substance silicon, 10-20 parts of carbon black, 22-35 parts of distilled water, 3-5 parts of polyving akohol of which the PH value is 6.5-7.3 and 0.2-0.5 part of wool grease. In the invention, all the raw materials can be localized, thereby the purchase cost is reduced; and the produced ceramic lining can normally work under the high-temperature working condition of 1,300 DEG C and has excellent properties of corrosion resistance, burning loss resistance, abrasion resistance and long service life of more than 100 days.

Description

Method for producing long-service-life wear-resistant blast furnace tuyere ceramic lining

Technical field

The present invention relates to a kind of working method of wear-resistant ceramic lining, the concrete working method that relates to a kind of long-service-life wear-resistant blast furnace tuyere ceramic lining.

Background technology

The air port lining is the consumption spare part that blast furnace is produced; The long-term wearing and tearing of in stove, bearing high temperature and bearing coal dust; The work working conditions is extremely abominable; Life-span length directly influences the normal operation of blast furnace, and air port lining life-span weak point brings following problem: (1) needs frequent change air port lining, causes the increase of cost of labor and production; Need the step-down damping down when (2) changing the air port lining, thereby influence production schedule, the problem of bringing energy consumption to increase.

In order to increase the service life, that the air port lining should satisfy is high temperature resistant, corrosion-resistant, the requirement of wearing and tearing, scaling loss.The air port lining that uses at present adopts fine copper manufacturing mostly, also has to adopt silicon nitride combined silicon carbide to produce, and also has plenty of in air port lining working-surface spraying one deck wear heat-resistant material.The air port lining resistance to elevated temperatures that is coated with wear heat-resistant material is poor, and wearing layer very easily comes off or washed away; And the air port lining of producing with red copper, fine copper and silicon nitride combined silicon carbide is because the materials used Effect on Performance; Production cost is high; Under the washing away of the erosion of molten iron and slag and furnace charge hot-air flow, work-ing life is not high yet, is merely 20 days the work-ing life of air port lining usually.

Summary of the invention

The invention solves above-mentioned technical problem, provide that a kind of technology is simple, production cost is low, the method for producing long-service-life wear-resistant blast furnace tuyere ceramic lining of high temperature resistant, corrosion-resistant, wearing and tearing, scaling loss.

Technical scheme is for being silit 50～70 with parts by weight; Elemental silicon is 20～30; Carbon black is 10～20; Zero(ppm) water 22～35, the pH value Z 150PH 3～5 between 6.5～7.3, the raw material of yolk 0.2～0.5 is processed through batching, slurrying, molding, moulding, drying, repaired biscuit, sintering, finishing.The preferred feedstock proportioning is: silit 70, elemental silicon are 20, and carbon black is 10, zero(ppm) water 27, Z 150PH 4, yolk 0.3.

Also add norbide weight part 0.1～0.4.Preferred 0.1 weight part.

Said working method is specially:

Batching: the raw material of preparing aforementioned part by weight; Preferred control powder component particle diameter is at 240 orders～1200 orders.

Slurrying: earlier silit is joined in the zero(ppm) water, stir after 3～7 hours, add elemental silicon again and stirred 3～5 hours; Add carbon black again, yolk, norbide stir, and add Z 150PH at last; Stirring is no less than 7～10 hours, and slip is mixed into paste;

Molding: according to outer mould in the lining of dimensioned air port, air port;

Moulding: adopt the solid casting method to carry out slip casting;

Dry: after the molding blank demoulding, 45 ℃～75 ℃ drying shed carries out oven dry in 60～72 hours;

Repaired biscuit: after the molding blank drying, the defective of billet surface is repaired;

Sintering: the base substrate that trims is put into vacuum oven, be warmed up to 1800 ℃～2000 ℃ and carry out vacuum reaction sintering, vacuum tightness is lower than 0.1Pa during sintering, the sintering time when 1560 ℃～1650 ℃ of temperature be 4～6 hours to guarantee fully carrying out of siliconising;

Finishing: will pass through the reacted base substrate of vacuum sintering through shot-peening or polishing, and process long-service-life wear-resistant blast furnace tuyere ceramic lining after removing the elemental silicon remain in billet surface and impurity.

Wear-resistant ceramic material is widely used in the every profession and trade owing to having the advantage that wear resistance is good, production cost is low; But the air port lining Working environment among the present invention is extremely abominable, high temperature resistant, the abrasive requirement is high, and the air port lining that adopts common wear-resistant ceramic material to make still is difficult to satisfy the long lifetime requirement; Moreover; The equal dependence on import of organic dispersing agent, leveler that needs adding in the common wear-resistant ceramic material raw material, all high in purchase cost, the problem that the haul-cycle time is long.

Adopt yolk to substitute existing organic dispersing agent, leveler simultaneously in the present invention's prescription; Raw material can all be domesticized; When having reduced purchase cost,, add in this prescription and reasonable control add-on because yolk has dispersion agent, leveler characteristic simultaneously; The homogeneity that can make each component in the finished product lining that makes increases each item performance index under the product high temperature greatly with dispersed better.

Further; In above-mentioned prescription, added norbide, because norbide has high temperature strength and the big characteristic of hardness, adding in the prescription significantly to increase the corrosion resistance under the product high temperature; Its add-on should be controlled between 0.1～0.4; Can not be too much or very few, cross and to cause the product cracking at most easily, cross that I haven't seen you for ages and do not have the effect and the erosion-resisting ability of corresponding increase hot strength.

Beneficial effect:

(1) blast-furnace tuyere lining of the present invention can temperature up to 1300 ℃ operating mode in works better, have the performance of excellent corrosion-resistant, scaling loss and wearing and tearing.

(2) existing blast-furnace tuyere lining is compared, and its working life is largely increased, and can reach more than 100 days, need not the frequent change lining, has reduced cost of labor and production cost, has reduced because the continuity of the energy consumption that the step-down damping down brings, assurance production.

(3) compare with existing wear-resistant ceramic material, have outstanding advantage aspect density, hardness, the fracture toughness property, density is by 2.65g/cm ³Bring up to 3.11g/cm ³, cold crushing strength is brought up to 243MPa by 160MPa; 1200 ℃ of hot modulus of rupture are brought up to 279MPa by 40MPa, and 1200 ℃ of thermal conductivitys are brought up to 41W/mK by 17.

(4) avoid the use of metallic substance, and raw material can domesticize all, when guaranteeing each item performance, reduce purchase cost, reduce, have wide market application prospect because use metallic substance to make the wasting of resources that the air port lining causes.

Embodiment

Embodiment 1

Raw material (parts by weight): silit 50, elemental silicon are 28, and carbon black is 20, zero(ppm) water 35, and pH value is at 6.5 Z 150PH 3, yolk 0.2, norbide 0.2.

Method:

Batching: the raw material of preparing aforementioned part by weight;

Slurrying: earlier silit is joined in the zero(ppm) water, stir after 3～7 hours, add elemental silicon again and stirred 3～5 hours; Add carbon black again, yolk, norbide stir, and add Z 150PH at last; Stirring is no less than 7～10 hours, and slip is mixed into paste;

Molding: according to outer mould in the lining of dimensioned air port, air port;

Moulding: adopt the solid casting method to carry out slip casting;

Dry: after the molding blank demoulding, 45 ℃～75 ℃ drying shed carries out oven dry in 60～72 hours;

Repaired biscuit: after the molding blank drying, the defective of billet surface is repaired;

Sintering: the base substrate that trims is put into vacuum oven, be warmed up to 1800 ℃～2000 ℃ and carry out vacuum reaction sintering, vacuum tightness is lower than 0.1Pa during sintering, and the sintering time of temperature in the time of 1560 ℃～1650 ℃ is 4～6 hours fully carrying out with the assurance siliconising; Finishing: will pass through the reacted base substrate of vacuum sintering through shot-peening or polishing, and process long-service-life wear-resistant blast furnace tuyere ceramic lining after removing the elemental silicon remain in billet surface and impurity.

Embodiment 2

Raw material (parts by weight): silit 70, elemental silicon are 20, and carbon black is 10, zero(ppm) water 27, the pH value Z 150PH 4 between 7.3, yolk 0.3, norbide 0.1.

Working method is with embodiment 1.

Embodiment 3

Raw material (parts by weight): silit 60, elemental silicon are 30, and carbon black is 10, zero(ppm) water 22, the pH value Z 150PH 5 between 7.3, yolk 0.4.

Working method is with embodiment 1.

Embodiment 4

Raw material (parts by weight): silit 55, elemental silicon are 27, and carbon black is 18, zero(ppm) water 30, the pH value Z 150PH 4 between 7.3, yolk 0.5, norbide 0.4.

Working method is with embodiment 1.

Table 1

In four examples implementing; Volume density is minimum also reaches 3.02g/cm3, and the compactness of material has had bigger raising, has strengthened the erosion resistance of ceramic chamber lining; The strength at normal temperature of these instances also was greatly improved more originally simultaneously; The more important thing is that high temperature break resistant intensity all is far longer than original parameter,, reached more than 2 times of existing wear-resistant ceramic material at 1200 ℃ thermal conductivity.

Claims (4)

1. method for producing long-service-life wear-resistant blast furnace tuyere ceramic lining; It is characterized in that, be silit 50～70 with parts by weight, and elemental silicon is 20～30; Carbon black is 10～20; Zero(ppm) water 22～35, the pH value Z 150PH 3～5 between 6.5～7.3, the raw material of yolk 0.2～0.5 is processed through batching, slurrying, molding, moulding, drying, repaired biscuit, sintering, finishing.

2. method for producing long-service-life wear-resistant blast furnace tuyere ceramic lining as claimed in claim 1 is characterized in that,

Batching: the raw material of preparing aforementioned part by weight;

Slurrying: earlier silit is joined in the zero(ppm) water, stir after 3～7 hours, add elemental silicon again and stirred 3～5 hours, add carbon black again, yolk stirs, and adds Z 150PH at last, stirs 7～10 hours, and slip is mixed into paste;

Molding: according to outer mould in the lining of dimensioned air port, air port;

Moulding: adopt the solid casting method to carry out slip casting;

Dry: as after the molding blank demoulding, to carry out oven dry in 60～72 hours at 45 ℃～75 ℃ drying sheds;

Repaired biscuit: after the molding blank drying, the defective of billet surface is repaired;

Sintering: the base substrate that trims is put into vacuum oven, be warmed up to 1800 ℃～2000 ℃ and carry out vacuum reaction sintering, vacuum tightness is lower than 0.1Pa during sintering, and the sintering time of temperature in the time of 1560 ℃～1650 ℃ is 4～10 hours fully carrying out with the assurance siliconising;

Finishing: will pass through the reacted base substrate of vacuum sintering through shot-peening or polishing, and process long-service-life wear-resistant blast furnace tuyere ceramic lining after removing the elemental silicon remain in billet surface and impurity.

3. method for producing long-service-life wear-resistant blast furnace tuyere ceramic lining; It is characterized in that, be silit 50～70 with parts by weight, and elemental silicon is 20～30; Carbon black is 10～20; Zero(ppm) water 22～35, the pH value Z 150PH 3～5 between 6.5～7.3, the raw material of yolk 0.2～0.5, norbide 0.1～0.4 weight part is processed through batching, slurrying, molding, moulding, drying, repaired biscuit, sintering, finishing.

4. method for producing long-service-life wear-resistant blast furnace tuyere ceramic lining as claimed in claim 3 is characterized in that,

Batching: the raw material of preparing aforementioned part by weight;

Slurrying: earlier silit is joined in the zero(ppm) water, stir after 3～7 hours, add elemental silicon again and stirred 3～5 hours, add carbon black again, yolk, norbide stir, and add Z 150PH at last, stir 7～10 hours, and slip is mixed into paste;

Molding: according to outer mould in the lining of dimensioned air port, air port;

Moulding: adopt the solid casting method to carry out slip casting;

Dry: as after the molding blank demoulding, to carry out oven dry in 60～72 hours at 45 ℃～75 ℃ drying sheds;

Repaired biscuit: after the molding blank drying, the defective of billet surface is repaired;

Sintering: the base substrate that trims is put into vacuum oven, be warmed up to 1800 ℃～2000 ℃ and carry out vacuum reaction sintering, vacuum tightness is lower than 0.1Pa during sintering, and the sintering time of temperature in the time of 1560 ℃～1650 ℃ is 4～10 hours fully carrying out with the assurance siliconising;

Finishing: will pass through the reacted base substrate of vacuum sintering through shot-peening or polishing, and process long-service-life wear-resistant blast furnace tuyere ceramic lining after removing the elemental silicon remain in billet surface and impurity.