CN105129827A - Production method for pseudo-boehmite - Google Patents
Production method for pseudo-boehmite Download PDFInfo
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- CN105129827A CN105129827A CN201510533861.0A CN201510533861A CN105129827A CN 105129827 A CN105129827 A CN 105129827A CN 201510533861 A CN201510533861 A CN 201510533861A CN 105129827 A CN105129827 A CN 105129827A
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Abstract
The present invention discloses a production method for pseudo-boehmite. The production method comprises: processing of primary red mud lotion, a gelling reaction, high temperature aging, washing, drying and obtaining of a finished product. The processing of primary red mud lotion comprises the following steps: heating primary red mud lotion produced during the production process of alumina to 90 to 100 DEG C, adding a calcium hydroxide solution, mechanically stirring for 30-60 minutes, then adding modified flocculant to polymerize polyferric silicate, mechanically stirring for 15-30 minutes, again adding red mud slurry produced during the production process of alumina to perporm a reaction and precipitation for 1-3 hours, sending the primary red mud slurry after the reaction and precipitation to a frame filter press through a pump to perform a filtration and a sodium metaaluminate solution with high alumina content, high cleanliness degree, high alumina-silica ratio and low silica content can be obtained. The production method provided by the present invention has the advantages of being simple in process, improving the utilization rate of alumina resources in red mud during the production process of alumina and reducing the production cost of pseudo-boehmite.
Description
Technical field
The present invention relates to a kind of production method of alumina product, specifically a kind of production method of pseudo-boehmite.
Background technology
Pseudo-boehmite, nontoxic, tasteless, odorless, white colloidal shape (wet product) or Powdered (dry product), crystalline phase purity is high, and peptization performance is good, and cohesiveness is strong, has the features such as specific surface is high, pore volume is large.The binding agent of semi-synthetic rare earth Y type molecular sieve cracking catalyst, the binding agent of aluminosilicate refractory fiber, dehydration of alcohol catalyst for making ethylene and epoxyethane catalyst etc. can be made, also can make the raw material of production support of the catalyst, activated alumina and other aluminium salt.Its product γ-Al2O3 of roasting between 400 ~ 700 DEG C is widely used as support of the catalyst, catalyzer and sorbent material etc.; It calcines between 1100 ~ 1200 DEG C can obtain nanometer alpha-Al2O3, being widely used as paint additive, high-grade ceramic, the effective catalyst of petrochemical complex, submicron/nanometer level abrasive substance and polishing material, makeup filler and inorganic material film etc., is the type material that a class has broad based growth future.
The production method of domestic pseudo-boehmite is generally carborization, carborization is the intermediate product with alumina producing---sodium aluminate solution (being seminal fluid again) is raw material, using the mixed gas of carbonic acid gas and air as precipitation agent, plastic reaction is carried out with sodium aluminate solution in glue bed, again at ageing tank through 85-90 DEG C of temperature, 2-2.5 hours high temperature ageings, subsequently through three press filtrations, washing, dry as finished product.There is due to sodium aluminate solution (seminal fluid) features such as alumina content high (AO=180g/l), cleanliness factor good (seston≤0.02g/l), alumina silica ratio high (A/S >=600), produce the good raw material of pseudo-boehmite, weak point is that price is high, causes the production cost of pseudo-boehmite high.
At present, the production technique of aluminum oxide is that bauxitic ore and sheet alkali, lime and circulating mother liquor add in raw material grinding mill in proportion and grind raw pulp, and continuous desiliconizing is carried out in the pre-desiliconizing workshop section heating that raw pulp is sent to digestion workshop.And at stripping pit, more than stop a few hours carry out deep desilication.Enter separation tank from stripping pit dilution slip out, the overflowing liquid of separation tank is thick liquid, and thick liquid becomes seminal fluid (i.e. sodium aluminate solution) after leaf filter filters.Seminal fluid delivers to the seminal fluid heat exchange operation of decomposing workshop, in this workshop section through three grades of heat exchange, then adds alumina seed and decomposes.Seed slurry is after the decomposition of 40 ~ 45 hours, and decomposer underflow is coarse particles aluminum hydroxide slime, and through hydraulic vortex flow devices classification unit, the calcination department that is sent to after classification carries out separation roasting, makes aluminum oxide finished product.The underflow (being red mud slurry again) of separation tank is sent to washing settling groove and washs, primary red mud slurry washing water are called a red mud wash liquor, this red mud wash liquor has alumina content low (AO=30-70g/l), cleanliness factor difference (seston about 0.3g/l), alumina silica ratio low (A/S=150-250), the high (SiO of dioxide-containing silica
2=0.18g/l-0.32g/l) etc. reason, in the production of aluminum oxide, usually evaporate reuse, this will increase enterprise's production cost.Or as discharge of wastewater, contaminate environment, also causes the wasting of resources.By the technology that the red mud wash liquor produced in aluminum oxide production process is raw material production pseudo-boehmite, also do not see relevant report.
Summary of the invention
Task of the present invention is to provide the method that the red mud wash liquor produced in a kind of aluminum oxide production process is raw material production pseudo-boehmite, to improve the utilization ratio of alumina resource in aluminum oxide production process red mud, reduces the production cost of pseudo-boehmite.
For realizing above-mentioned task, technical solution of the present invention is:
A kind of method of producing pseudo-boehmite, comprise the process of a red mud wash liquor, plastic is reacted, high temperature ageing, washing, dry, finished product, the process of a described red mud wash liquor comprises the following steps: in a reservoir the red mud wash liquor that aluminum oxide production process produces is heated to 90-100 DEG C, add aqua calcis, mechanical stirring 30-60 minutes, then modified flocculant polymerization Polyferric Sulfate silicon is added, mechanical stirring 15-30 minutes, add the red mud slurry produced in aluminum oxide production process again, carry out reaction precipitation 1-3 hours, good for a reaction precipitation red mud wash liquor is filtered by being pumped to plate and frame(type)filter press, namely alumina content is obtained high, cleanliness factor is high, alumina silica ratio is high, the sodium aluminate solution that dioxide-containing silica is low.
The production method of described a kind of pseudo-boehmite, the volume ratio of the aqua calcis added in the treating processes of a red mud wash liquor and a red mud wash liquor is 1:150-1:250.
The production method of described a kind of pseudo-boehmite, the volume ratio of the modified flocculant added in the treating processes of red mud wash liquor polymerization Polyferric Sulfate silicon and a red mud wash liquor is 1:10000-1:80000.
The production method of described a kind of pseudo-boehmite, the volume ratio of the red mud slurry produced in the aluminum oxide production process added in the treating processes of a red mud wash liquor and a red mud wash liquor is 1:100-1:120.
It is simple that the present invention has technique, improves the utilization ratio of alumina resource in aluminum oxide production process red mud, reduce the advantage of pseudo-boehmite production cost.
Embodiment
Embodiment 1, get the red mud wash liquor 100m3 produced in aluminum oxide production process and enter reaction subsider, sampling analysis, alumina content (AO=57.21g/l), seston (0.22g/l), alumina silica ratio (A/S=260), silicon-dioxide (0.22g/l), be heated to 90 DEG C, add aqua calcis 0.67m3(300g/l), mechanical stirring 30 minutes, then modified flocculant polymerization Polyferric Sulfate silicon 0.0125m3 is added, mechanical stirring 15 minutes, the routine added again in the red mud slurry 1.0m3(alumina producing produced in aluminum oxide production process contains 300g/l admittedly) do Desilication seed, carry out reaction precipitation 3 hours, good for a reaction precipitation red mud wash liquor is filtered by being pumped to plate and frame(type)filter press, namely alumina content high (AO=57.01g/l) is obtained, cleanliness factor high (seston 0.017g/l), alumina silica ratio high (A/S=648), the sodium aluminate solution of dioxide-containing silica low (0.088g/l), using the mixed gas of carbonic acid gas and air as precipitation agent, plastic reaction is carried out with sodium aluminate solution in glue bed, again at ageing tank through 85 DEG C of temperature, 2 hours high temperature ageings, subsequently through three press filtrations, washing, dry as finished product.
Embodiment 2, get the red mud wash liquor 100m3 produced in aluminum oxide production process and enter reaction subsider, sampling analysis, alumina content (AO=37.34g/l), seston (0.27g/l), alumina silica ratio (A/S=132), silicon-dioxide (0.28g/l), be heated to 100 DEG C, add aqua calcis 0.40m3(300g/l), mechanical stirring 45 minutes, then modified flocculant polymerization Polyferric Sulfate silicon 0.01m3 is added, mechanical stirring 30 minutes, the routine added again in the red mud slurry 0.83m3(alumina producing produced in aluminum oxide production process contains 300g/l admittedly) do Desilication seed, carry out reaction precipitation 1 hour, good for a reaction precipitation red mud wash liquor is filtered by being pumped to plate and frame(type)filter press, namely alumina content high (AO=37.34g/l) is obtained, cleanliness factor high (seston 0.012g/l), alumina silica ratio high (A/S=612), the sodium aluminate solution of dioxide-containing silica low (0.061g/l), using the mixed gas of carbonic acid gas and air as precipitation agent, plastic reaction is carried out with sodium aluminate solution in glue bed, again at ageing tank through 90 DEG C of temperature, 2.5 hours high temperature ageings, subsequently through three press filtrations, washing, dry as finished product.
Embodiment 3, get the red mud wash liquor 100m3 produced in aluminum oxide production process and enter reaction subsider, sampling analysis, alumina content (AO=59.78g/l), seston (0.34g/l), alumina silica ratio (A/S=186), silicon-dioxide (0.32g/l), be heated to 95 DEG C, add aqua calcis 0.5m3(300g/l), mechanical stirring 60 minutes, then modified flocculant polymerization Polyferric Sulfate silicon 0.0025m3 is added, mechanical stirring 20 minutes, the routine added again in the red mud slurry 0.91m3(alumina producing produced in aluminum oxide production process contains 300g/l admittedly) do Desilication seed, carry out reaction precipitation 2 hours, good for a reaction precipitation red mud wash liquor is filtered by being pumped to plate and frame(type)filter press, namely alumina content high (AO=58.53g/l) is obtained, cleanliness factor high (seston 0.018g/l), alumina silica ratio high (A/S=636), the sodium aluminate solution of dioxide-containing silica low (0.092g/l), using the mixed gas of carbonic acid gas and air as precipitation agent, plastic reaction is carried out with sodium aluminate solution in glue bed, again at ageing tank through 87 DEG C of temperature, 2.2 hours high temperature ageings, subsequently through three press filtrations, washing, dry as finished product.
Claims (4)
1. the production method of a pseudo-boehmite, comprise the process of a red mud wash liquor, plastic is reacted, high temperature ageing, washing, dry, finished product, the process of a described red mud wash liquor comprises the following steps: in a reservoir the red mud wash liquor that aluminum oxide production process produces is heated to 90-100 DEG C, add aqua calcis, mechanical stirring 30-60 minutes, then modified flocculant polymerization Polyferric Sulfate silicon is added, mechanical stirring 15-30 minutes, add the red mud slurry produced in aluminum oxide production process again, carry out reaction precipitation 1-3 hours, good for a reaction precipitation red mud wash liquor is filtered by being pumped to plate and frame(type)filter press, namely alumina content is obtained high, cleanliness factor is high, alumina silica ratio is high, the sodium aluminate solution that dioxide-containing silica is low.
2. the production method of a kind of pseudo-boehmite according to claim 1, is characterized in that: the volume ratio of the aqua calcis added in the treating processes of a red mud wash liquor and a red mud wash liquor is 1:150-1:250.
3. the production method of a kind of pseudo-boehmite according to claim 1, is characterized in that: the modified flocculant polymerization Polyferric Sulfate silicon added in the treating processes of a red mud wash liquor and the volume ratio of a red mud wash liquor are 1:10000-1:80000.
4. the production method of a kind of pseudo-boehmite according to claim 1, is characterized in that: the volume ratio of the red mud slurry produced in the aluminum oxide production process added in the treating processes of a red mud wash liquor and a red mud wash liquor is 1:100-1:120.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107973327A (en) * | 2017-11-29 | 2018-05-01 | 河南兴浩新材料科技股份有限公司 | A kind of impurity-removing method of red mud wash liquor and the production method of boehmite |
Citations (4)
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| CN1377828A (en) * | 2002-03-05 | 2002-11-06 | 平顶山市汇源化学工业公司 | Process for removing silicon dioxide from Bayer process sodium aluminate solution |
| CN101920978A (en) * | 2010-06-25 | 2010-12-22 | 山西铝厂科技化工公司 | Method for producing boehmite by using washing liquor |
| WO2011072323A1 (en) * | 2009-12-14 | 2011-06-23 | Xstrata Technology Pty Ltd | Process for treating red mud |
| CN103145161A (en) * | 2013-01-08 | 2013-06-12 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Method for preparing pseudo-boehmite co-preparation white carbon black by coal gangue |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1377828A (en) * | 2002-03-05 | 2002-11-06 | 平顶山市汇源化学工业公司 | Process for removing silicon dioxide from Bayer process sodium aluminate solution |
| WO2011072323A1 (en) * | 2009-12-14 | 2011-06-23 | Xstrata Technology Pty Ltd | Process for treating red mud |
| CN101920978A (en) * | 2010-06-25 | 2010-12-22 | 山西铝厂科技化工公司 | Method for producing boehmite by using washing liquor |
| CN103145161A (en) * | 2013-01-08 | 2013-06-12 | 大唐国际发电股份有限公司高铝煤炭资源开发利用研发中心 | Method for preparing pseudo-boehmite co-preparation white carbon black by coal gangue |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107973327A (en) * | 2017-11-29 | 2018-05-01 | 河南兴浩新材料科技股份有限公司 | A kind of impurity-removing method of red mud wash liquor and the production method of boehmite |
| CN107973327B (en) * | 2017-11-29 | 2019-06-28 | 河南兴浩新材料科技股份有限公司 | A kind of impurity-removing method of red mud wash liquor and the production method of boehmite |
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