CN108623291A - A kind of technique preparing refractory castable for ladle coproduction acid - Google Patents
A kind of technique preparing refractory castable for ladle coproduction acid Download PDFInfo
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- CN108623291A CN108623291A CN201810713866.5A CN201810713866A CN108623291A CN 108623291 A CN108623291 A CN 108623291A CN 201810713866 A CN201810713866 A CN 201810713866A CN 108623291 A CN108623291 A CN 108623291A
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- ladle
- refractory castable
- gahnite
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
- C04B35/101—Refractories from grain sized mixtures
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/69—Sulfur trioxide; Sulfuric acid
- C01B17/74—Preparation
- C01B17/76—Preparation by contact processes
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
- C04B2235/3206—Magnesium oxides or oxide-forming salts thereof
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3217—Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
- C04B2235/3222—Aluminates other than alumino-silicates, e.g. spinel (MgAl2O4)
Abstract
The present invention provides a kind of techniques preparing refractory castable for ladle coproduction acid, include the following steps：Raw material are made in ardealite, red mud, additive and modifying agent mixed grinding, is sent into kiln and roasts to obtain clinker；Clinker is dissolved out, and carries out being separated by solid-liquid separation isolated solution and prepares aluminium oxide；Aluminium oxide obtained and calcium hexaluminate, magnesia mixed grinding are obtained into mixed powder, refractory castable for ladle is uniformly mixed to obtain by corundum, hercynite and gahnite are added in mixed powder；Isolated residue is obtained into sulfide through flotation；Sulfuric acid is made in sulfide processing.The present invention, which has, prepares refractory castable for ladle and relieving haperacidity is at low cost, waste residue utilization rate is high, the refractory castable for ladle compressive resistance of preparation is high, heating when permanent Linear change rate is small, bulk density is larger, so that the feature that castable high volume stability is strong, thermal shock resistance is high, resistance to slag is good, simple for process.
Description
Technical field
The present invention relates to a kind of techniques preparing refractory castable for ladle coproduction acid, belong to field of metallurgy and chemical engineering.
Background technology
Corundum, hercynite and gahnite are utilized for the existing existing inner lining refractory for ladle
As aggregate to improve the intensity of castable refractory, ensure that castable refractory is fast after coated in aluminium melting furnace using magnesium phosphate cement
Rapid hardening knot is shaped, and magnesia of the castable at the same time in magnesia powder, magnesium phosphate cement also react generation magnalium with alumina powder
Spinelle so improves castable refractory to be combined with corundum, hercynite and gahnite, calcium hexaluminate
Resistance to slag.But in the production of existing refractory castable for ladle, added using a large amount of aluminium oxide and other raw materials mostly
Work is prepared, and the complex manufacturing technology of existing aluminium oxide, production cost are high, cause price of aluminium oxide expensive, greatly increase
The production cost of refractory castable for ladle.
Red mud is to refine the waste generated in alumina process with bauxite.It is in crimson color muddy because it is rich in iron
And it gains the name.1 ton of aluminium oxide is often produced, 1.0-2.0 tons of red mud is about generated.The year yield of China's red mud is about 1.0 hundred million tons, is tired out
It is about 500,000,000 tons to count volume of cargo in storage.
Ardealite refer in phosphoric acid production with sulfuric acid treating phosphorite when the solid slag that generates, main component is sulfuric acid
Calcium（CaSO4）, content generally can reach 70-90% or so.In addition, ardealite also contains plurality of impurities：Undecomposed phosphorus ore,
Phosphoric acid, calcirm-fluoride, iron, aluminium compound, acid non-soluble substance, organic matter of non-washes clean etc..Ardealite is discharged every year about in China
20000000 tons, add up nearly hundred million tons of discharge capacity.For utilization rate of the ardealite in terms of building materials less than 5%, a large amount of gypsum stacks occupy soil
Ground seriously pollutes environment.
It is now currently, seldom for the technology of the comprehensive utilization of ardealite and red mud, it is substantially focused on building materials and paves the way
Traditional field, which results in the waste of a large amount of high value ingredients in ardealite and red mud, added value is very low.And by ardealite and
Red mud comprehensively utilizes come refractory castable for ladle processed, while the technique of coproduction acid, has not been reported.
Goal of the invention
The object of the present invention is to provide a kind of techniques preparing refractory castable for ladle coproduction acid.The present invention has system
Standby refractory castable for ladle and relieving haperacidity are at low cost, and waste residue utilization rate is high, the resistance to pressure of refractory castable for ladle of preparation
Degree is high, heating when permanent Linear change rate is small, bulk density is larger so that castable high volume stability is strong, thermal shock resistance
Feature high, resistance to slag is good, simple for process.
Technical scheme of the present invention
A kind of technique preparing refractory castable for ladle coproduction acid, includes the following steps：
A, ardealite, red mud, additive and modifying agent are mixed and is ground and raw material are made, be sent into roasting in kiln, clinker is made；
B, clinker made from step A is dissolved out, and is separated by solid-liquid separation；
C, CO is added into solution isolated step B2It is no longer generated to white precipitate, it is clear after then filtering out white precipitate
Drying and calcination are washed, aluminium oxide is obtained；
D, aluminium oxide made from step C and calcium hexaluminate, magnesia mixed grinding are obtained into mixed powder, it is rigid by being added in mixed powder
Beautiful, hercynite and gahnite are uniformly mixed to obtain refractory castable for ladle；
E, by residue isolated step B through flotation, sulfide is detached to obtain；
F, the step E sulfide isolated is placed under the oxygen-enriched environment of 30-50%, 3-5h is roasted at 800-1200 DEG C, roasted
The flue gas of generation is absorbed using the concentrated sulfuric acid after vanadic anhydride catalysis reaction, sulfuric acid is made.
In the technique above-mentioned for preparing refractory castable for ladle coproduction acid, in step A, the red mud is Bayer process
Produce the red mud that aluminium oxide generates；The additive is sodium carbonate, sodium sulphate or caustic soda；The modifying agent be anthracite, carbon or
Gangue.
In the technique above-mentioned for preparing refractory castable for ladle coproduction acid, in step A, in the raw material, phosphorus stone
Cream and red mud are according to 1:The ratio of 0.7-2 weight ratios mixes, and additive adding proportion presses contained Na in raw material2O and A12O3+Fe2O3
The molecular proportion of summation is 1:1 addition, the mixed proportion of modifying agent are the 10-25% of raw material total weight.
In the technique above-mentioned for preparing refractory castable for ladle coproduction acid, in step A, the kiln is that industry is turned round
Kiln, Industry Tunnel Kiln or industrial shaft kiln.
It is in temperature 1000-1350 in step A in the technique above-mentioned for preparing refractory castable for ladle coproduction acid
Roasting time 1-2h at DEG C.
It is molten after clinker elder generation water mill in step B in the technique above-mentioned for preparing refractory castable for ladle coproduction acid
Go out；It is 4-6 that liquid when dissolution, which consolidates volume ratio,:1.
In the technique above-mentioned for preparing refractory castable for ladle coproduction acid, in step C, calcination is in temperature 800-
Calcination time 3-5h at 1200 DEG C.
In the technique above-mentioned for preparing refractory castable for ladle coproduction acid, in step D, by weight, the iron
Water packet with castable refractory include 50-60 parts of aluminium oxide, 30-35 parts of corundum, calcium hexaluminate be 20-25 parts, 30-35 parts of magnesia,
20-25 parts of 20-25 parts of hercynite and gahnite.
In the technique above-mentioned for preparing refractory castable for ladle coproduction acid, in step D, the corundum, iron aluminium point are brilliant
Stone and gahnite are aggregate, and calcium hexaluminate, magnesia, aluminium oxide are powder.
In the technique above-mentioned for preparing refractory castable for ladle coproduction acid, in step D, a diameter of 2- of the corundum
3mm, a diameter of 1-1.5mm of gahnite, a diameter of 0.1-0.5mm of gahnite.
The present invention is by by ardealite and red mud reaction, recombination, making utility.The net reaction of principle is：
CaSO4（Ardealite）+ Na2O·SiO2·Al2O3（Red mud）→ Na2O·Al2O3 + CaO·SiO2↓+[sulphur]
From the reaction equation it is found that with the SiO in the CaO and red mud in ardealite2Generate calcium orthosilicate（ CaO·SiO2↓）Afterwards,
Obtain soluble fabulous sodium aluminate（Na2O·Al2O3）.[sulphur] in reaction equation refers to by raw material doping and modification
Agent technique, the metal sulfide of generation；After leaching the sodium aluminate in clinker, obtained sediment flotation be can be obtained into metal sulphur
Compound.
Advantageous effect
1, the present invention and is added after additive and modifying agent by using ardealite and red mud as raw material, in high-temperature roasting
Technique under obtain the clinker of main silicate-containing, aluminate and sulfide, and the main component of the aluminate is sodium aluminate, will
Sodium aluminate it is water-soluble go out after may be recovered, and after solid residue flotation, obtain sulfide, sulfuric acid prepared using sulfide,
Aluminium oxide is prepared by the sodium aluminate of recycling, aluminium oxide and other raw materials are prepared into refractory castable for ladle, due to
Mainly using ardealite and red mud as raw material in entire technique, add other a small amount of substances, therefore, greatly reduce relieving haperacidity and
The cost input of refractory castable for ladle.The utilization rate for also greatly increasing ardealite and waste red mud residues, to alleviate phosphorus stone
Cream and red mud have important contribution to the pollution of environment.
2, the present invention by raw material by roasting after, obtained ingredient is clearly demarcated, aluminium mainly with aluminic acid na form exist, profit
The characteristic of water is highly soluble in sodium aluminate, can be simple and quick be isolated and be used to prepare aluminium oxide, by aluminium oxide with it is other
Raw material prepares refractory castable for ladle, refractory castable for ladle compressive resistance is high, heating when permanent Linear change rate it is small,
Bulk density is larger so that castable high volume stability is strong, thermal shock resistance is high, and resistance to slag is good, and foundry ladle fire resisting
Castable is at low cost.
3, the present invention obtains after the solid residue flotation in technique sulfide, sulfuric acid, relieving haperacidity is prepared using sulfide
Cost it is low, acid-making process is simple.
Further to prove that the effect of the present invention, inventor have done following experiment.
1, the experiment of refractory castable for ladle
Inventor is respectively to the refractory castable for ladle in following five groups of embodiments, using existing magnesium phosphate cement by iron
Water packet is shaped with castable refractory, and carries out performance detection, and testing result is shown in Table 1；
It is obtained by 1 refractory castable for ladle testing result table analysis of the present invention of table, foundry ladle fire resisting of the invention is poured
Material feeding compressive resistance is high, and permanent Linear change rate is small when heating, larger in 1500 DEG C of compressive resistance height, bulk densities, has good
Volume stability so that castable high volume stability is strong, thermal shock resistance is high, and resistance to slag is good.
Specific implementation mode
With reference to embodiment, the present invention is further illustrated, but is not intended as the foundation limited the present invention.
The embodiment of the present invention
Embodiment 1：A kind of technique preparing refractory castable for ladle coproduction acid, steps are as follows：
A, ardealite, Bayer red mud, sodium carbonate and anthracite are mixed and is ground and raw material are made, be sent into industrial rotary kiln in temperature
Clinker is made in roasting time 1.5h at 1000 DEG C of degree；Wherein, ardealite and Bayer red mud are according to 1:The ratio of 0.7 weight ratio is mixed
It closes, sodium carbonate adding proportion presses contained Na in raw material2O and A12O3+Fe2O3The molecular proportion of summation is 1:1 addition, it is anthracitic mixed
Composition and division in a proportion example is the 10% of raw material total weight；
B, clinker made from step A is consolidated into volume ratio as 4 with liquid:1 carries out water mill dissolution, and is separated by solid-liquid separation；
C, by residue isolated step B through flotation, sulfide is detached to obtain；
D, the step C sulfide isolated is placed under 30% oxygen-enriched environment, 5h is roasted at 800 DEG C, roast the flue gas of generation
After vanadic anhydride catalysis reaction, is absorbed using the concentrated sulfuric acid, sulfuric acid is made；
E, CO is added into solution isolated step B2It is no longer generated to white precipitate, it is clear after then filtering out white precipitate
Drying is washed, calcination time 5h obtains aluminium oxide at 800 DEG C of temperature；
F, aluminium oxide made from step E and calcium hexaluminate, magnesia mixed grinding are obtained into mixed powder, it is rigid by being added in mixed powder
Beautiful, hercynite and gahnite are uniformly mixed to obtain refractory castable for ladle；Wherein by weight, the molten iron
Packet castable refractory include 50 parts of aluminium oxide, 30 parts of corundum, calcium hexaluminate be 20 parts, 30 parts of magnesia, 20 parts of hercynite
With 20 parts of gahnite；The wherein described corundum, hercynite and gahnite are aggregate, calcium hexaluminate, magnesia, oxidation
Aluminium is powder；A diameter of 2-3mm of corundum, a diameter of 1-1.5mm of gahnite, a diameter of 0.1- of gahnite
0.5mm。
Embodiment 2：A kind of technique preparing refractory castable for ladle coproduction acid, steps are as follows：
A, ardealite, Bayer red mud, sodium sulphate and carbon are mixed and is ground and raw material are made, be sent into industrial rotary kiln in temperature
Clinker is made in roasting time 2h at 1200 DEG C；Wherein, ardealite and Bayer red mud are according to 1:The ratio of 1 weight ratio mixes, caustic soda
Adding proportion presses contained Na in raw material2O and A12O3+Fe2O3The molecular proportion of summation is 1:The mixed proportion of 1 addition, carbon is that raw material are total
The 15% of weight；
B, clinker made from step A is consolidated into volume ratio as 5 with liquid:1 carries out water mill dissolution, and is separated by solid-liquid separation；
C, by residue isolated step B through flotation, sulfide is detached to obtain；
D, the step C sulfide isolated is placed under 35% oxygen-enriched environment, 4h is roasted at 900 DEG C, roast the flue gas of generation
After vanadic anhydride catalysis reaction, is absorbed using the concentrated sulfuric acid, sulfuric acid is made；
E, CO is added into solution isolated step B2It is no longer generated to white precipitate, it is clear after then filtering out white precipitate
Drying is washed, calcination time 4h obtains aluminium oxide at 1000 DEG C of temperature；
F, aluminium oxide made from step E and calcium hexaluminate, magnesia mixed grinding are obtained into mixed powder, it is rigid by being added in mixed powder
Beautiful, hercynite and gahnite are uniformly mixed to obtain refractory castable for ladle；Wherein by weight, the molten iron
Packet castable refractory include 60 parts of aluminium oxide, 30 parts of corundum, calcium hexaluminate be 25 parts, 30 parts of magnesia, 25 parts of hercynite
With 20 parts of gahnite；The wherein described corundum, hercynite and gahnite are aggregate, calcium hexaluminate, magnesia, oxidation
Aluminium is powder；A diameter of 2-3mm of corundum, a diameter of 1-1.5mm of gahnite, a diameter of 0.1- of gahnite
0.5mm。
Embodiment 3：A kind of technique preparing refractory castable for ladle coproduction acid, steps are as follows：
A, ardealite, Bayer red mud, caustic soda and gangue are mixed and is ground and raw material are made, be sent into industrial rotary kiln in temperature
Clinker is made in roasting time 1.5h at 1300 DEG C；Wherein, ardealite and Bayer red mud are according to 1:The ratio of 1.3 weight ratios mixes,
Sodium carbonate adding proportion presses contained Na in raw material2O and A12O3+Fe2O3The molecular proportion of summation is 1:1 addition, the mixing ratio of gangue
Example is the 20% of raw material total weight；
B, clinker made from step A is consolidated into volume ratio as 6 with liquid:1 carries out water mill dissolution, and is separated by solid-liquid separation；
C, by residue isolated step B through flotation, sulfide is detached to obtain；
D, the step C sulfide isolated is placed under 45% oxygen-enriched environment, 3h is roasted at 1000 DEG C, roast the cigarette of generation
Gas is absorbed using the concentrated sulfuric acid after vanadic anhydride catalysis reaction, sulfuric acid is made；
E, CO is added into solution isolated step B2It is no longer generated to white precipitate, it is clear after then filtering out white precipitate
Drying is washed, calcination time 3h obtains aluminium oxide at 1100 DEG C of temperature；
F, aluminium oxide made from step E and calcium hexaluminate, magnesia mixed grinding are obtained into mixed powder, it is rigid by being added in mixed powder
Beautiful, hercynite and gahnite are uniformly mixed to obtain refractory castable for ladle；Wherein by weight, the molten iron
Packet castable refractory include 55 parts of aluminium oxide, 32 parts of corundum, calcium hexaluminate be 22 parts, 32 parts of magnesia, 23 parts of hercynite
With 20 parts of gahnite；The wherein described corundum, hercynite and gahnite are aggregate, calcium hexaluminate, magnesia, oxidation
Aluminium is powder；A diameter of 2-3mm of corundum, a diameter of 1-1.5mm of gahnite, a diameter of 0.1- of gahnite
0.5mm。
Embodiment 4：A kind of technique preparing refractory castable for ladle coproduction acid, steps are as follows：
A, ardealite, Bayer red mud, sodium carbonate and gangue are mixed and is ground and raw material are made, be sent into industrial rotary kiln in temperature
Clinker is made in roasting time 1h at 1350 DEG C of degree；Wherein, ardealite and Bayer red mud are according to 1:The ratio of 1.6 weight ratios mixes,
Caustic soda adding proportion presses contained Na in raw material2O and A12O3+Fe2O3The molecular proportion of summation is 1:1 addition, the mixed proportion of gangue
It is the 25% of raw material total weight；
B, clinker made from step A is consolidated into volume ratio as 5 with liquid:1 carries out water mill dissolution, and is separated by solid-liquid separation；
C, by residue isolated step B through flotation, sulfide is detached to obtain；
D, the step C sulfide isolated is placed under 45% oxygen-enriched environment, 3h is roasted at 1200 DEG C, roast the cigarette of generation
Gas is absorbed using the concentrated sulfuric acid after vanadic anhydride catalysis reaction, sulfuric acid is made；
E, CO is added into solution isolated step B2It is no longer generated to white precipitate, it is clear after then filtering out white precipitate
Drying is washed, calcination time 3h obtains aluminium oxide at 1200 DEG C of temperature；
F, aluminium oxide made from step E and calcium hexaluminate, magnesia mixed grinding are obtained into mixed powder, it is rigid by being added in mixed powder
Beautiful, hercynite and gahnite are uniformly mixed to obtain refractory castable for ladle；Wherein by weight, the molten iron
Packet castable refractory include 50 parts of aluminium oxide, 32 parts of corundum, calcium hexaluminate be 22 parts, 30 parts of magnesia, 23 parts of hercynite
With 25 parts of gahnite；The wherein described corundum, hercynite and gahnite are aggregate, calcium hexaluminate, magnesia, oxidation
Aluminium is powder；A diameter of 2-3mm of corundum, a diameter of 1-1.5mm of gahnite, a diameter of 0.1- of gahnite
0.5mm。
Embodiment 5：A kind of technique preparing refractory castable for ladle coproduction acid, steps are as follows：
A, ardealite, Bayer red mud, sodium sulphate and anthracite are mixed and is ground and raw material are made, be sent into industrial rotary kiln in temperature
Clinker is made in roasting time 2h at 1200 DEG C of degree；Wherein, ardealite and Bayer red mud are according to 1:The ratio of 2 weight ratios mixes, and burns
Alkali adding proportion presses contained Na in raw material2O and A12O3+Fe2O3The molecular proportion of summation is 1:1 addition, anthracitic mixed proportion are
The 20% of raw material total weight；
B, clinker made from step A is consolidated into volume ratio as 4 with liquid:1 carries out water mill dissolution, and is separated by solid-liquid separation；
C, by residue isolated step B through flotation, sulfide is detached to obtain；
D, the step C sulfide isolated is placed under 50% oxygen-enriched environment, 4h is roasted at 1100 DEG C, roast the cigarette of generation
Gas is absorbed using the concentrated sulfuric acid after vanadic anhydride catalysis reaction, sulfuric acid is made；
E, CO is added into solution isolated step B2It is no longer generated to white precipitate, it is clear after then filtering out white precipitate
Drying is washed, calcination time 5h obtains aluminium oxide at 1200 DEG C of temperature；
F, aluminium oxide made from step E and calcium hexaluminate, magnesia mixed grinding are obtained into mixed powder, it is rigid by being added in mixed powder
Beautiful, hercynite and gahnite are uniformly mixed to obtain refractory castable for ladle；Wherein by weight, the molten iron
Packet castable refractory include 50 parts of aluminium oxide, 35 parts of corundum, calcium hexaluminate be 25 parts, 35 parts of magnesia, 25 parts of hercynite
With 25 parts of gahnite；The wherein described corundum, hercynite and gahnite are aggregate, calcium hexaluminate, magnesia, oxidation
Aluminium is powder；A diameter of 2-3mm of corundum, a diameter of 1-1.5mm of gahnite, a diameter of 0.1- of gahnite
0.5mm。
Claims (10)
1. a kind of technique preparing refractory castable for ladle coproduction acid, which is characterized in that include the following steps：
A, ardealite, red mud, additive and modifying agent are mixed and is ground and raw material are made, be sent into roasting in kiln, clinker is made；
B, clinker made from step A is dissolved out, and is separated by solid-liquid separation；
C, CO is added into solution isolated step B2It is no longer generated to white precipitate, it is clear after then filtering out white precipitate
Drying and calcination are washed, aluminium oxide is obtained；
D, aluminium oxide made from step C and calcium hexaluminate, magnesia mixed grinding are obtained into mixed powder, it is rigid by being added in mixed powder
Beautiful, hercynite and gahnite are uniformly mixed to obtain refractory castable for ladle；
E, by residue isolated step B through flotation, sulfide is detached to obtain；
F, the step E sulfide isolated is placed under the oxygen-enriched environment of 30-50%, 3-5h is roasted at 800-1200 DEG C, roasted
The flue gas of generation is absorbed using the concentrated sulfuric acid after vanadic anhydride catalysis reaction, sulfuric acid is made.
2. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step A
In, the red mud is the red mud that alumina producing Bayer process generates；The additive is sodium carbonate, sodium sulphate or caustic soda；Institute
It is anthracite, carbon or gangue to state modifying agent.
3. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step A
In, in the raw material, ardealite and red mud are according to 1:The ratio of 0.7-2 weight ratios mixes, and additive adding proportion presses raw material
In contained Na2O and A12O3+Fe2O3The molecular proportion of summation is 1:1 addition, the mixed proportion of modifying agent are the 10- of raw material total weight
25%。
4. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step A
In, the kiln is industrial rotary kiln, Industry Tunnel Kiln or industrial shaft kiln.
5. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step A
In, it is the roasting time 1-2h at 1000-1350 DEG C of temperature.
6. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step B
In, it is dissolved out after clinker elder generation water mill；It is 4-6 that liquid when dissolution, which consolidates volume ratio,:1.
7. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step C
In, calcination is the calcination time 3-5h at 800-1200 DEG C of temperature.
8. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step D
In, by weight, the refractory castable for ladle is comprising 50-60 parts of aluminium oxide, 30-35 parts of corundum, calcium hexaluminate
20-25 parts of 20-25 parts, 30-35 parts of magnesia, 20-25 parts of hercynite and gahnite.
9. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step D
In, the corundum, hercynite and gahnite are aggregate, and calcium hexaluminate, magnesia, aluminium oxide are powder.
10. the technique according to claim 1 for preparing refractory castable for ladle coproduction acid, it is characterised in that：Step D
In, a diameter of 2-3mm of the corundum, a diameter of 1-1.5mm of gahnite, a diameter of 0.1- of gahnite
0.5mm。
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| Publication number | Priority date | Publication date | Assignee | Title |
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