CN1057442A - A kind of production method of aluminium hydroxide used as filling material - Google Patents
A kind of production method of aluminium hydroxide used as filling material Download PDFInfo
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- CN1057442A CN1057442A CN 90105316 CN90105316A CN1057442A CN 1057442 A CN1057442 A CN 1057442A CN 90105316 CN90105316 CN 90105316 CN 90105316 A CN90105316 A CN 90105316A CN 1057442 A CN1057442 A CN 1057442A
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- aluminium hydroxide
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- oven dry
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Abstract
A kind of production method of aluminium hydroxide used as filling material.The production field that belongs to the aluminum oxide chemical preparations.The main technique feature is that the refined sodium aluminate solution of a desiliconization of alkali-lime sinter process is made raw material, adds the CaO deironing, uses CO
2Method is decomposed, the aluminum oxide of separating out after filtration, washing, oven dry, obtain product.This product does not have organic impurity and pollutes, and iron level is low generally can to reach 0.004-0.005%, is suitable for doing the filler of artificial agate.
Description
The invention belongs to the production field of aluminum oxide chemical preparations.
As artificial agate filler's aluminium hydroxide, its quality specification mainly comprises whiteness, water soluble alkali content, moisture content etc.The external this filler of producing is use Bayer process, promptly presses to boil and leaches bauxite and prepare sodium aluminate solution, then this solution is carried out purifying treatment, and solution stirs decomposition method with crystal seed after handling, and separates out aluminium hydroxide.Can not remove organic impurity in the sodium aluminate solution fully because of purifying treatment, so the aluminium hydroxide of separating out is polluted by organic impurity, this aluminium hydroxide still contains organism after chemical treatment, has influenced the whiteness of product.Be used as artificial agate filler's aluminium hydroxide in addition, its iron level should be controlled at 0.004～0.005%, it is the leaf filtration process of medium that method for removing iron abroad mainly adopts with milk of lime, to reduce the iron level of sodium aluminate solution, but the result is undesirable, and the iron of product aluminium hydroxide is generally still between 0.007-0.008.
The objective of the invention is, provide a kind of release organic impurity to pollute, and iron level is used production of aluminum hydroxide technology 0.004～0.005% artificial agate filler.
In process program of the present invention,, adopt alkali-lime sinter process Al for exempting the pollution of organic impurity to product
2O
3Wrought aluminum acid solution in the production process after the desiliconization is made raw material, and the main technical points of this technology is: add CaO in the material solution, fully stir, with CaO and solution, reaction generates 3CaOAl
2O
36H
2O makes iron removing reagent, to finish the deironing operation of solution, and after the slurries liquid-solid phase of gained is separated, its solution CO
2Method is decomposed, the aluminium hydroxide of separating out after filtration, the washing and the oven dry, obtain product aluminium hydroxide.
The composition of wrought aluminum acid sodium solution is generally after the used desiliconization: Al
2O
3The 70-110 grams per liter, Na
2The O80-120 grams per liter, SiO
20.2～0.3 grams per liter, Fe
2O
3Trace.
The addition of its CaO can be the 2-10 grams per liter, is preferably the 3-5 grams per liter.The CO that adopts
2The condition of method apportioned effort can be: temperature 80-100 ℃, and the CO of feeding
2Gas concentration is generally 30-42%, is preferably 38-40%, aeration time 2-6 hour, is preferably 3-4 hour.
Decompose back aluminium hydroxide particulate slurries, can be without subsider filtering separation, the purpose of making is to avoid aluminium hydroxide classification in settling process like this, particulate is taken away by overflow.
After the filtering separation, the bath water of aluminium hydroxide can be that hardness is 0, and basicity is less than 12 mg/litre, temperature 80-100 ℃.
Aluminium hydroxide after the oven dry can carry out cyclone dust collection, and fines directly enters feed bin, and coarse aluminium hydroxide sieves, and removes that caking and other foreign material are laggard goes into feed bin.The sieve network No. is generally the 40-100 order, is preferably the 60-80 order.
For the quality that further improves product can be established alnico magnets to remove the ferromagnetic material in the finished product at dryer and finished bin exit.
Technology of the present invention is made raw material with the wrought aluminum acid sodium solution after the desiliconization of alkali-lime sinter process, thereby exempts Organic pollutants, uses the tricalcium aluminate good iron removal effect, makes the iron level of product reach 0.004-0.005%, is suitable for doing the filler of artificial agate.
Example: the wrought aluminum acid sodium solution of getting after the desiliconization of alkali-lime sinter process is made raw material, and composition is Al
2O
388 grams per liters, Na
2The O100 grams per liter, SiO
20.26 grams per liter, Fe
2O
3Trace.Add milk of lime 6 grams per liters in tempering tank, stir through thorough mixing, slurries filter with the energy storage type filter, to finish the deironing operation of material solution, the A/S(Al of the material solution after the deironing
2O
3With SiO
2Weight ratio) be 780, seston＜0.016 grams per liter, above-mentioned stoste enters carbonizer, uses CO
2Gas decomposes, the CO of ventilation
2Concentration is 38%, aeration time 3 hours, 85 ℃ of temperature.The aluminium hydroxide of separating out directly filters with filter without subsider, and filter cake is by washing and filtering machine and pressure filter washing, and its wash water hardness is 0, and basicity is less than 12 grams per liters.Send into rake formula drying machine drying from the moisture content that pressure filter obtains less than 8% aluminium hydroxide, dryer outlet material moisture content has dropped to 0.1%, deliver to the formula of falling vertebra tornado dust collector with air again, particulate is gone into finished bin after bagroom captures, coarse grain removes residual on the sieve through 60 mesh sieves, and undersize material is gone into finished bin.Dryer exit and finished bin exit all are provided with permanent magnet, so that ferromagnetic material is removed.The specification of the finished product is: Al
2O
3Greater than 64%, Fe
2O
30.003%, Na
2O
Entirely＜0.45%, Na
2O(is solvable)＜0.02% free-water＜0.3%, whiteness is greater than 95.
Claims (13)
1, a kind of aluminium hydroxide manufacture method as the artificial agate filler is with alkali one lime sinter process Al
2O
3Wrought aluminum acid sodium solution in the production process after the desiliconization is made raw material, it is characterized in that adding in the material solution CaO, fully stirs, after gained slurries liquid-solid phase is separated, and its solution CO
2Method is decomposed, and the aluminium hydroxide of separating out filters, washs and oven dry.
2, in accordance with the method for claim 1, it is characterized in that the CaO addition is the 2-10 grams per liter in the described material solution, described CO
2The condition that method is decomposed is temperature 80-100 ℃, the CO of feeding
2Gas concentration 30-42%, aeration time 2-6 hour.
3, in accordance with the method for claim 1, it is characterized in that the CaO addition is the 3-5 grams per liter in the described material solution, described CO
2The condition that method is decomposed is temperature 80-100 ℃, the CO of feeding
2Gas concentration 38-40%, aeration time 3-4 hour.
4, according to claim 1 or 2 or 3 described methods, it is characterized in that said CO
2Slurries after method is decomposed directly carry out filtering separation.
5, according to claim 1 or 2 or 3 described methods, the hardness that it is characterized in that described aluminium hydroxide bath water is 0, basicity＜12 mg/litre, temperature 80-100 ℃.
6, in accordance with the method for claim 4, the hardness that it is characterized in that described aluminium hydroxide bath water is 0, and basicity is less than 12 mg/litre.Temperature 80-100 ℃.
7, according to claim 1 or 2 or 3 or 6 described methods, it is characterized in that carrying out cyclone dust collection after the aluminium hydroxide oven dry, with the coarse aluminium hydroxide screening that obtains, screen cloth is the 40-100 order, is preferably the 60-80 order.
8, in accordance with the method for claim 4, it is characterized in that carrying out cyclone dust collection after the aluminium hydroxide oven dry, with the coarse aluminium hydroxide screening that obtains, screen cloth is the 40-100 order, is preferably the 60-80 order.
9, in accordance with the method for claim 6, it is characterized in that carrying out cyclone dust collection after the aluminium hydroxide oven dry, with the coarse aluminium hydroxide screening that obtains, screen cloth is the 40-100 order, is preferably the 60-80 order.
10,, it is characterized in that dryer outlet and finished bin outlet are provided with permanent magnet according to claim 1 or 2 or 3 or 6 or 8 or 9 described methods.
11, in accordance with the method for claim 4, it is characterized in that dryer outlet and finished bin outlet are provided with permanent magnet.
12, in accordance with the method for claim 5, it is characterized in that dryer outlet and finished bin outlet are provided with permanent magnet.
13, in accordance with the method for claim 7, it is characterized in that dryer outlet and finished bin outlet are provided with permanent magnet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105316 CN1057442A (en) | 1990-06-19 | 1990-06-19 | A kind of production method of aluminium hydroxide used as filling material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 90105316 CN1057442A (en) | 1990-06-19 | 1990-06-19 | A kind of production method of aluminium hydroxide used as filling material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1057442A true CN1057442A (en) | 1992-01-01 |
Family
ID=4879141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 90105316 Pending CN1057442A (en) | 1990-06-19 | 1990-06-19 | A kind of production method of aluminium hydroxide used as filling material |
Country Status (1)
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| CN (1) | CN1057442A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113038C (en) * | 2000-11-09 | 2003-07-02 | 中国铝业股份有限公司 | Process for preparing beta-aluminium hydroxide |
| CN102320637A (en) * | 2011-08-18 | 2012-01-18 | 中国铝业股份有限公司 | Production method of aluminium hydroxide for artificial stone filler |
| CN102390850A (en) * | 2011-08-04 | 2012-03-28 | 中国铝业股份有限公司 | Carbon-decomposing high-whiteness aluminum hydroxide filler and chromaticity control method thereof |
| CN102390851A (en) * | 2011-08-18 | 2012-03-28 | 中国铝业股份有限公司 | Production method for high-whiteness aluminum hydroxide |
| CN103787392A (en) * | 2014-02-12 | 2014-05-14 | 内蒙古蒙西鄂尔多斯铝业有限公司 | Method for producing aluminium oxide by using clinker dissolving-out liquid subjected to lime desilicication treatment |
-
1990
- 1990-06-19 CN CN 90105316 patent/CN1057442A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1113038C (en) * | 2000-11-09 | 2003-07-02 | 中国铝业股份有限公司 | Process for preparing beta-aluminium hydroxide |
| CN102390850A (en) * | 2011-08-04 | 2012-03-28 | 中国铝业股份有限公司 | Carbon-decomposing high-whiteness aluminum hydroxide filler and chromaticity control method thereof |
| CN102320637A (en) * | 2011-08-18 | 2012-01-18 | 中国铝业股份有限公司 | Production method of aluminium hydroxide for artificial stone filler |
| CN102390851A (en) * | 2011-08-18 | 2012-03-28 | 中国铝业股份有限公司 | Production method for high-whiteness aluminum hydroxide |
| CN103787392A (en) * | 2014-02-12 | 2014-05-14 | 内蒙古蒙西鄂尔多斯铝业有限公司 | Method for producing aluminium oxide by using clinker dissolving-out liquid subjected to lime desilicication treatment |
| CN103787392B (en) * | 2014-02-12 | 2015-02-04 | 内蒙古蒙西鄂尔多斯铝业有限公司 | Method for producing aluminium oxide by using clinker dissolving-out liquid subjected to lime desilicication treatment |
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