CN85102276A - The method of making sandy alumina from refined solution of sintering process - Google Patents

The method of making sandy alumina from refined solution of sintering process Download PDF

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Publication number
CN85102276A
CN85102276A CN198585102276A CN85102276A CN85102276A CN 85102276 A CN85102276 A CN 85102276A CN 198585102276 A CN198585102276 A CN 198585102276A CN 85102276 A CN85102276 A CN 85102276A CN 85102276 A CN85102276 A CN 85102276A
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China
Prior art keywords
aluminium hydroxide
seed
carbon
sandy
accordance
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CN198585102276A
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平文正
周忠禹
邢曙亚
黎培章
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ZHENGZHOU LIGHT METAL INST
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ZHENGZHOU LIGHT METAL INST
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Priority to CN198585102276A priority Critical patent/CN85102276A/en
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F7/00—Compounds of aluminium
    • C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
    • C01F7/04—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom
    • C01F7/14—Aluminium oxide or hydroxide from alkali metal aluminates
    • C01F7/141—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent
    • C01F7/142—Aluminium oxide or hydroxide from alkali metal aluminates from aqueous aluminate solutions by neutralisation with an acidic agent with carbon dioxide
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00—Technologies relating to chemical industry
    • Y02P20/141—Feedstock

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)

Abstract

The method of making sandy alumina from refined solution of sintering process belongs to makes a kind of sandy alumina that modern aluminum tank uses that is suitable for.Here provide a kind of new carbonating to decompose and seed stirring decomposition technique flow process, can produce out the high sandy aluminium hydroxide of intensity from the sintering process seminal fluid.This flow process mainly is included in 75～90 ℃ of preparation of carbonate decomposition seed, and add the above-mentioned seeds that make at 65～85 ℃ and carry out preparation of carbonization of sand-like aluminum hydroxide, and to add above-mentioned sandy aluminium hydroxides at 50～75 ℃ be that seed stirs and decomposes three processes.

Description

The method of making sandy alumina from refined solution of sintering process
Method of the present invention belongs to makes a kind of sandy alumina that modern aluminum tank uses that is suitable for.
Current, China's alumina producing is about 32% lime furnace gas at sintering process carbonation decomposition process system carbonated, carbon divided about 3 hours under 85 ℃ of temperature, the gained hydroxide particle-size is thick, but intensity difference, its coefficient of wear of the aluminum oxide after the roasting is 51.5～56.0%.The Guizhou Aluminum Factory laboratory test adds the aluminum oxide that makes behind the Aluminium hydroxide roasting of aluminium hydroxide crystal seed gained at carbonation decomposition course, though intensity makes moderate progress, coefficient of wear still is that " your aluminum aluminum oxide second phase integrated process is produced the sandy alumina laboratory report " Guizhou Aluminum Factory aluminum oxide subsidiary factory, Guiyang Institute of Al-Mg-Design 19834 are delivered in the appraisal meeting of 25～30%(1983 China Nonferrous Metals Industry Corporation in July).Institute of Shandong Aluminum Plant also once carried out adding the carbon separating tests that carbon divides the aluminium hydroxide product to make crystal seed, the coefficient of wear of gained Aluminium hydroxide roasting rear oxidation aluminium is 26.7%(" Shanxi Aluminium Plant carbon divides production sandy alumina trial report ", institute of Shandong Aluminum Plant 198210).
The carbon dioxide that Soviet Union's sintering process seminal fluid carbonating resolving system adopts chamotte kiln to produce, CO 212～14%, carbon divides 70～80 ℃ of temperature, and often adds aluminium hydroxide crystal seed.Carbon divides the time to reach 6～8 hours, and prepared hydroxide particle-size is thicker, but the intensity no data can be looked into.Western countries produce at the carbon branch does not see reported in literature aspect the sandy alumina.
Sintering process seminal fluid seed stirs and decomposes, having only China to produce at present adopts, producing product at present is powdery aluminum, Guizhou Aluminum Factory is produced sandy aluminium hydroxide to sintering process seminal fluid seed stirring decomposition and was once carried out laboratory test, adopting seed stirring analytical product aluminium hydroxide to return as seed decomposes, seed coefficient 1.0～1.5, granularity-45 μ that obtains sandy aluminium hydroxide is 6～10%, the coefficient of wear of roasting oxidation aluminium is 12～14%, illustrates that the granularity of sandy alumina and intensity all are good.But reaching 50%, kind branch rate of decomposition needs to decompose about 60 hours, will be than the existing production resolving time above one times, production efficiency greatly reduces (19837 China Nonferrous Metals Industry Corporation hold data " your aluminium second phase integrated process is produced the sandy alumina trial report "-Guizhou Aluminum Factory aluminum oxide subsidiary factory, the Guiyang Institute of Al-Mg-Design 19834 that appraisal meeting is sent out).
The objective of the invention is under the situation that does not reduce the existing installation production capacity, decompose and seed stirs to decompose and produces epigranular, sandy aluminium hydroxide that intensity is high from sintering process seminal fluid carbonating, roasting rear oxidation aluminium coefficient of wear can be less than 16%.
Technical characterictic of the present invention is to add to give earlier special crystal seed in sintering process seminal fluid carbonation decomposition course, and this activity of crystal seed is big, and granularity is suitable.The method for preparing crystal seed is:
It is common sintering process seminal fluid that crystal seed prepares used solution, and concentration is preferably Al of 60～120 grams per liters 2O 390～100 grams per liters, α k1.45～1.55, decomposition temperature can be controlled 70～95 ℃, should be 85～90 ℃, and carbon divides the time can control 2～6 hours, should be 3 hours.It can be the suitable carbon dioxide gas of concentration in lime furnace gas or other source that carbon divides used carbonic acid gas, carbon branch rate of decomposition is controlled routinely, can be according to seminal fluid desiliconization index and select rate of decomposition to the aluminium hydroxide specification of quality, adopts such processing condition just can obtain activity greatly, granularity suits, agglomeration aluminium hydroxide seed preferably.
The crystal seed preparation can prepare separately with a special-purpose trough for preparing crystal seed, can also divide groove to prepare a part of aluminium hydroxide crystal seed earlier by the smart decomposition condition of planting of preparation at production aluminium hydroxide carbon and carry out carbon branch production sandy aluminium hydroxide then.Carry out carbonating decomposition for producing sand-like aluminium hydroxide with above-mentioned special crystal seed as seed.
Carbon divides employing lower decomposition temperature, to reduce agglomeration, increases bonding, improve the intensity of product aluminium hydroxide, 60～85 ℃ of temperature controls, the most suitable 73～77 ℃, temperature is crossed to hang down and a large amount of fine-grained aluminum hydroxides will be occurred, and the too high bonding that will cause of temperature is relatively poor, and intensity is lower.The ratio that above-mentioned special seed crystal of aluminium hydroxide is added in the carbon timesharing is, seed coefficient 0.1～0.4, the most suitable 0.15～0.25, the time that carbonating is decomposed can be controlled 2～6 hours, should be about 3 hours, carbon branch rate of decomposition is controlled routinely, requires to select rate of decomposition according to the seminal fluid desiliconization index and to quality product, thereby the aluminium hydroxide that adopts carbon branch novel process to make is basic identical with the quality of existing production aluminium hydroxide with regard to its Chemical Composition.The hydroxide aluminium paste is classified or not classified directly to carry out thick dense filtration, gained carbon sub-sand shape aluminium hydroxide can be partly or entirely as seed, carry out sintering process seminal fluid seed and stir decomposition, the seed coefficient is 0.5～1.5, be preferably 0.8～1.0, decompose 65～75 ℃ of initial temperature, decompose warm 50～60 ℃ eventually, 20～30 hours resolving times, decomposition nut liquid α k2.8～3.2, decompose gained hydroxide aluminium paste and can classifiedly or not classified directly carry out thick dense filtration, and obtain epigranular, sandy aluminium hydroxide that intensity is good.Carbon sub-sand shape aluminium hydroxide and plant sub-sand shape aluminium hydroxide through washing 1000～1100 ℃ of temperature roastings, just can produce intensity height, epigranular, sandy alumina that specific surface area is big.
The present invention compares with existing production technology, do not reducing under carbonizer and seed stirring decomposer production capacity and the rate of decomposition situation, epigranular, intensity is good, specific surface area is big sandy alumina have been obtained, compare with the technical process that other unit delivers, the intensity of carbon sub-sand shape aluminum oxide is obviously much better, it is over half that sintering process seminal fluid kind divides the time to shorten, and strengthened to plant to divide and produced.
Example:
Sintering process seminal fluid composition: TNa 2The O104.4 grams per liter, Al 2O 393.4g/l,
αk1.50，Al 2O 3/SiO 2＝445。
1, carbon divides used crystal seed preparation:
In the crystal seed preparation vessel, add the sintering process seminal fluid and feed carbon dioxide gas (CO at 85 ℃ 231%), mechanical stirring, carbon divided 3 hours, and carbon divides rate of decomposition 87%, obtains the seed aluminum hydroxide granularity after filtration :+150 μ account for 0.2%, and-150 μ～45 μ account for 84.3%, and-45 μ account for 15.5%.Seed aluminum hydroxide B, E, T specific surface area 25m 2/ g.
2, carbonating is decomposed
Divide to carbon that the sintering process seminal fluid adds above-mentioned seed aluminum hydroxide in the groove, seed coefficient 0.2 feeds carbon dioxide gas (CO at 75 ℃ 231%), mechanical stirring, carbon divided 3 hours, and carbon divides rate of decomposition 87%, and not classified direct filtration obtains carbon sub-sand shape aluminium hydroxide.At 1000～1100 ℃ of rotary kiln bakings, obtain intensity height, epigranular, sandy alumina that specific surface area is big.The sandy alumina granularity :+150 μ account for 0.1%, and-150 μ～45 μ account for 92%, and-45 μ account for 8.4 %, aluminum oxide coefficient of wear 13.4%, aluminum oxide B, E, T specific surface area 60m 2/ g, igloss 0.7%, this sandy alumina is suitable for flue gas dry cleaning and large-scale centre is put the use that the roasting groove is given in blanking automatically.
3, seed stirs and decomposes
(1) the sintering process seminal fluid adds the carbon sub-sand shape aluminium hydroxide of above-mentioned 2 preparations as crystal seed in seed precipitation tank, crystal seed coefficient 0.5, decompose 69 ℃ of initial temperature, temperature is 55 ℃ eventually, decompose 23.5 hours decomposition nut liquid α k2.88, rate of decomposition 47.6%, the not classified direct filtration of decomposed product, washing, after 1080 ℃ of roastings, gained aluminum oxide Main physical character is as follows:
Aluminum oxide grain size :+150 μ account for 6.4%, and-150 μ～45 μ account for 89.2%,
-45 μ account for 4.4%.
Aluminum oxide coefficient of wear: 10.6%.
(2) adding the above-mentioned 2 carbon sub-sand shape aluminium hydroxides that prepare to seed precipitation tank sintering process seminal fluid is crystal seed crystal seed coefficient 1.0, decompose 67.6 ℃ of initial temperature, temperature is 55 ℃ eventually, decomposed 22 hours, decomposition nut liquid α k3.12, the not classified direct filtration of rate of decomposition 52%, decomposed product, washing, gained aluminum oxide Main physical character is as follows after 1080 ℃ of roastings:
Aluminum oxide grain size :+150 μ account for 4.0%, and-150 μ～45 μ account for 89.1%,
-45 μ account for 6.8%.
Aluminum oxide coefficient of wear: 14.3%.
4, the main physico-chemical property of sintering process sandy alumina:
According to different alumina production process flows, it is inequality that carbon when sending to roasting divides aluminium hydroxide and the ratio of planting branch aluminium hydroxide, the two ratio can be 0～1.5: 1, so some physico-chemical property row of roasting gained sintering process sandy alumina is a scope.
The Chemical Composition of sandy alumina: (%) SiO 20.055～0.03, Fe 2O 30.016,
NaO0.55, igloss (110～1100 ℃) 0.7.
The granularity of aluminum oxide :+150 μ account for 2.6～6.4%, and-150 μ～45 μ account for
88～92% ,-45 μ account for 5～7%.
The coefficient of wear of aluminum oxide: 10.6～14.3%.
The specific surface area of aluminum oxide: 50～60 meters squared per gram.

Claims (13)

1, a kind ofly decompose and seed stirs and decomposes the method for producing sandy alumina and it is characterized in that adding in carbonation decomposition course and give earlier special crystal seed with sintering process seminal fluid carbonating, this crystal seed is to carry out the carbonating decomposition by common sintering process seminal fluid feeding carbon dioxide to make, the crystal seed that this is special joins carbon by a certain percentage and divides in the groove, under lower temperature, carry out the carbon branch, obtain the hydroxide aluminium paste, can classified or directly carry out thick dense filtration, washing and produce even-grained sandy aluminium hydroxide, do the seed stirring decomposition that seed carries out the sintering process seminal fluid with part or all of this sandy aluminium hydroxide again, obtain the hydroxide aluminium paste and can classified or directly carry out thick dense filtration, washing.Carbon sub-sand shape aluminium hydroxide divides aluminium hydroxide to mix with kind or carries out roasting separately, makes sandy alumina through roasting.
2, in accordance with the method for claim 1, it is characterized in that preparing the concentration Al of the brilliant liquid of sintering process that crystal seed adopts 2O 360～120 grams per liters, optimum concn Al 2O 390～100 grams per liters, α k1.45～1.55.
3, in accordance with the method for claim 1, it is characterized in that preparing crystal seed carbon, to divide used concentration of carbon dioxide be 12～35%, and it can be a limestone kiln gas, also can be the suitable carbon dioxide of concentration in other source.
4, in accordance with the method for claim 1, it is characterized in that preparing the temperature that crystal seed carbon divides is 70～95 ℃, 85～90 ℃ of optimum tempss.
5, in accordance with the method for claim 1, it is characterized in that preparing crystal seed can prepare separately with a crystal seed preparation vessel, can also divide groove to give earlier at carbon and prepare crystal seed by the decomposition condition for preparing crystal seed, carry out preparation of carbonization of sand-like aluminum hydroxide again.
6, in accordance with the method for claim 1, the decomposition temperature that it is characterized in that preparation of carbonization of sand-like aluminum hydroxide is 60～85 ℃, 73～77 ℃ of optimum tempss.
7, in accordance with the method for claim 1, when it is characterized in that the carbon branch is produced sandy aluminium hydroxide, the seed coefficient is 0.1～0.4, with 0.15～0.25 the best.
8, in accordance with the method for claim 1, it is characterized in that the sandy aluminium hydroxide slurry that the carbon branch makes, can classifiedly or not classified directly carry out thick dense filtration, washing and produce even-grained sandy aluminium hydroxide.
9, in accordance with the method for claim 1, it is characterized in that in the timesharing of sintering process seminal fluid kind that adding the sandy aluminium hydroxide that above-mentioned carbon branch makes is seed, the seed coefficient is 0.5～1.5, the most suitable 0.8～1.0.
10, in accordance with the method for claim 1, it is characterized in that initial temperature adopts 65～75 ℃ in kind of a timesharing, 70 ℃ of the most suitable employings, temperature adopts 50～60 ℃ eventually, 55 ℃ of the most suitable employings.
11, in accordance with the method for claim 1, it is characterized in that sandy aluminium hydroxide slurry that kind of branch makes can classifiedly or not classified directly carry out thick dense filtration, washing and produce even-grained sandy aluminium hydroxide.
12, in accordance with the method for claim 1, it is characterized in that aluminium hydroxide that the carbon branch makes divides the aluminium hydroxide that makes to mix or carries out roasting separately with planting.
13, in accordance with the method for claim 1, the maturing temperature that it is characterized in that aluminium hydroxide is 1000～1100 ℃.
CN198585102276A 1985-04-01 1985-04-01 The method of making sandy alumina from refined solution of sintering process Pending CN85102276A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102515218A (en) * 2011-11-22 2012-06-27 河南神火新材料有限公司 Production method of aluminum hydroxide
CN106241844A (en) * 2016-07-15 2016-12-21 牛太同 A kind of sandy alumina seeded precipitation additive

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102515218A (en) * 2011-11-22 2012-06-27 河南神火新材料有限公司 Production method of aluminum hydroxide
CN106241844A (en) * 2016-07-15 2016-12-21 牛太同 A kind of sandy alumina seeded precipitation additive

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