CN102775162A

CN102775162A - Anti-skinning refractory casting material

Info

Publication number: CN102775162A
Application number: CN2012102429116A
Authority: CN
Inventors: 山国强
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-07-15
Filing date: 2012-07-15
Publication date: 2012-11-14

Abstract

The invention relates to an anti-skinning refractory casting material which is characterized by comprising 45-53% of 5-1mm silicon carbide, 17-28% of 1-0mm waste magnesia-alumina spinel brick, 10-16% of 325-mesh waste magnesia-alumina spinel brick, 0-8% of 200-mesh magnesia-alumina spinel fine powder, 0-8% of 200-mesh alpha-aluminum oxide micropowder, 2-6% of silicon ash, 0-6% of calcium aluminate cement, 0-0.3% of additional dispersant and 0-0.3% of admixture. The material, which is mainly composed of silicon carbide, waste magnesia-alumina spinel, magnesia-alumina spinel micropowder, aluminum oxide micropowder, silicon ash, calcium aluminate cement and dispersant, has the advantages of favorable formability, high stripping speed, satisfactory high-temperature properties and excellent chemical stability, and is suitable for novel quarternary and quinary cyclone preheaters for dry-method cement kilns, thereby being an anti-skinning refractory material with excellent properties.

Description

A kind of resistive connection skin refractory castable

Technical field

The present invention relates to a kind of unshape refractory; This material is mainly by silit; Useless magnesium-aluminium spinel and micro mist, alumina powder, silicon ash, aluminous cement and admixture are formed; Having good processability, stripping rate, satisfied high-temperature behavior, fabulous chemicalstability faster, be suitable for new type nonaqueous cement kiln level Four, five-stage cyclone preheater, is a kind of resistive connection skin refractory materials of excellent performance.

Background technology

In the 1970's, cement predecomposition production technology has appearred.This technology is separated the back kiln tail that moves to rotary kiln with dehydration, warm and the major part of cement slurry, accomplishes the heat transfer of waste gas and raw material at suspended preheater, and adds a fire realization CaCO at decomposing furnace ₃Decomposition, and then reduced the pressure of rotary kiln operating mode.Because of heat transfer efficiency increases, the predecomposition cement kiln has significantly improved output.In addition, area of dissipation reduces, and has reduced energy consumption, has practiced thrift resource, has just reduced cost.After this, nsp kiln is extensively adopted, and becomes the main flow kiln type of Cement industry.

In the new type nonaqueous cement kiln, whether level Four, five-stage cyclone preheater and four Pyatyi tremie pipes unimpeded affects production can normally carry out, therefore significant; Though use temperature is below 1100 ℃ here; But owing to have alkalescence or volatile matter such as alkaline-earth oxide and muriate system in kiln, motions such as the outer decomposing system of kiln are sent back in the kiln again at last, move in circles; After the circulation enrichment reaches balance; But alkaline earth basic oxide enrichment 3-5 is doubly, but 5 times of SO3 enrichments, but 100 times of muriate enrichments.Therefore, the existence of a large amount of volatile matter makes some material stick on the refractory materials, causes the space to narrow down, and finally hinders air-flow and stream flow, forms and stops up, and influences ordinary production.

Summary of the invention

The objective of the invention is to develop a kind of crusting resistant pouring material, make it have anti-SO ₂, R ₂O and RO erosive performance are difficult for sticking the kiln material and skinning take place, have good processability, can fast demoulding, have stable high-temperature performance, this material can improve existing Al ₂O ₃-SiO ₂The high temperature anti-scaling property of-SiC material.

Can know according to physical chemistry,The SiC oxidation produces the full-bodied material of one deck, and the pore of shutoff refractory surface intercepts R ₂O, RO, O ₂Deng the intrusion of material, reduce the kiln material and stick, reduce erosion rate, in addition, useless Mg-Al spinel brick belongs to alkalescence, does not contain free MgO and free Al ₂O ₃, have anti-SO ₂, R ₂O and RO erosive performance, thereby this product has good resistive connection bark effect.

In view of above analysis, mould material proportioning of the present invention is:

5-lmm silit 45-53%

The useless Mg-Al spinel brick of 1-0mm 17 one 28%

The useless Mg-Al spinel brick of 325 orders 10 one 16%

-200 order magnesium-aluminium spinel fine powders 0-8%

-200 order αYang Hualv micro mists 0-8%

Silicon ash 2-6%

Aluminous cement 0-6%

Add dispersion agent 0-0.3%

Admixture 0-0.3%.

The chemical content of silit is silit >=90%.

Useless Mg-Al spinel brick is chosen, and broken back granularity is selected 1-0mm for use, 325 orders, and its chemical ingredients is spinel >=85%.

Said magnesium-aluminium spinel refers to electric smelting or sintering processing production, MgO/Al ₂O ₃Magnesium-aluminium spinel marketable material independent or compound arbitrarily of the high-purity or alumina base of mole ≈ 1, wherein the staple of high-purity magnesium-aluminum spinel is Al ₂O ₃=67-73%, MgO=26-32%, the main chemical compositions of alumina base magnesium-aluminium spinel is Al ₂O ₃=55-60%, MgO=30-40%.SiO ₂≤3%.Said aluminous cement refers to CA to be the pure calcium aluminate cement of essential mineral composition, also can be to be the high-alumina cement of essential mineral composition with CA.

Said dispersion agent is a polyethylene glycols.

Said admixture refers to the arbitrary combination of carboxyl methyl cellulose or yellow starch gum.

Embodiment

Embodiment 1

5-lmm silit 45%

The 1-0mm Mg-Al spinel brick 23% that gives up

The 325 orders Mg-Al spinel brick 16% that gives up

-200 order magnesium-aluminium spinel fine powders 4%

-200 order αYang Hualv micro mists 4%

Silicon ash 4%

Aluminous cement 4%

Add dispersion agent 0.16%

Admixture 0%

Each raw material through weighing, mix and stir, cast, maintenance, the demoulding, ll0 ℃ * 24h is dry, traditional performance is surveyed in 1100 ℃ * 3h thermal treatment.The resistive connection skin test is tested with sandwich sample (1100 ℃ * 3h handles refractory materials+mix 8% anhydrous potassium sulfate cement slurry) and is calcined test at 1100 ℃ * 3h;

Test result is following:

[0013]Embodiment 2:

5-lmm silit 53%

The 1-0mm Mg-Al spinel brick 17% that gives up

The 325 orders Mg-Al spinel brick 10% that gives up

-200 order magnesium-aluminium spinel fine powders 8%

-200 order αYang Hualv micro mists 4%

Silicon ash 5%

Aluminous cement 3%

Add sodium hexametaphosphate dispersant 0.16%

Add carboxyl methyl cellulose 0.15%

Each raw material through weighing, mix and stir, cast, maintenance, the demoulding, 110 ℃ * 24h be dry, 1100 ℃ * 3h thermal treatment is surveyed traditional performance through 1100 ℃ * 3h thermal treatment again.The resistive connection skin test is tested with sandwich sample (1100 ℃ * 3h handles refractory materials+mix 8% anhydrous potassium sulfate cement slurry) and is calcined test at 1100 ℃ * 3h;

Test result is following:

Claims

1. resistive connection skin refractory castable, it is characterized in that: described casting material formula does

5-lmm silit 45-53%

The useless Mg-Al spinel brick of 1-0mm 17 one 28%

The useless Mg-Al spinel brick of 325 orders 10 one 16%

-200 order magnesium-aluminium spinel fine powders 0-8%

-200 order αYang Hualv micro mists 0-8%

Silicon ash 2-6%

Aluminous cement 0-6%

Add dispersion agent 0-0.3%

Admixture 0-0.3%.

2. silit chemistry content is >=90%.

3. useless Mg-Al spinel brick is chosen, and broken back granularity is selected 1-0mm for use, 325 orders, and its chemical ingredients is spinel >=85%.

4. said magnesium-aluminium spinel refers to electric smelting or sintering processing production, MgO/Al ₂O ₃Magnesium-aluminium spinel marketable material independent or compound arbitrarily of the high-purity or alumina base of mole ≈ 1, wherein the staple of high-purity magnesium-aluminum spinel is Al ₂O ₃=67-73%, MgO=26-32%, the main chemical compositions of alumina base magnesium-aluminium spinel is Al ₂O ₃=55-60%, MgO=30-40%.SiO ₂≤3%.

5. said aluminous cement refers to CA to be the pure calcium aluminate cement of essential mineral composition, also can be to be the high-alumina cement of essential mineral composition with CA.

6. said dispersion agent is a polyethylene glycols.

7. said admixture refers to the arbitrary combination of carboxyl methyl cellulose or yellow starch gum.