CN103449484A - Method for continuously producing pseudoboehmite - Google Patents

Method for continuously producing pseudoboehmite Download PDF

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CN103449484A
CN103449484A CN 201310374043 CN201310374043A CN103449484A CN 103449484 A CN103449484 A CN 103449484A CN 201310374043 CN201310374043 CN 201310374043 CN 201310374043 A CN201310374043 A CN 201310374043A CN 103449484 A CN103449484 A CN 103449484A
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pseudoboehmite
method
gas
continuously
metaaluminate
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CN 201310374043
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CN103449484B (en )
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丁安平
武建生
薛文忠
朱小龙
高晓辉
张红莉
李超
樊文贞
刘淑清
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中国铝业股份有限公司
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P20/00Technologies relating to chemical industry
    • Y02P20/10General improvement of production processes causing greenhouse gases [GHG] emissions
    • Y02P20/12Energy input
    • Y02P20/121Energy efficiency measures, e.g. energy management

Abstract

The invention discloses a method for continuously producing pseudoboehmite, belonging to the technical field of boehmite preparation. The method comprises the following steps: continuously adding a sodium metaaluminate solution into a reactor while introducing an air-carbon dioxide gas mixture, and forming a strong liquid flow of the sodium metaaluminate solution to be thoroughly mixed with the carbon dioxide gas; controlling the flow rates of the gas mixture and the sodium metaaluminate solution to control the temperature of the slurry generated by reaction at 25-55 DEG C and the pH value at 9.5-11; and after the slurry passes through a pipeline with a plurality of U-shaped bends, aging the slurry, filtering, washing with water, and drying to obtain the pseudoboehmite. The pseudoboehmite prepared by the method has the characteristics of large specific area and pore volume, reasonable peptization, continuous production, simple technique, high production efficiency, stable product quality, low equipment investment, reliable operation, low energy consumption, low labor intensity and the like, is convenient to operate and maintain, and is especially suitable for producing common pseudoboehmite, superfine aluminum hydroxide or aluminum oxide.

Description

一种连续生产拟薄水铝石的方法 A continuous quasi boehmite production method

技术领域 FIELD

[0001] 本发明涉及铝石制备技术领域,特别涉及一种连续生产拟薄水铝石的方法。 [0001] Technical Field The present invention relates to the preparation of boehmite, in particular, relates to a process for the continuous production of boehmite is pseudoboehmite.

背景技术 Background technique

[0002] 拟薄水铝石又称一水合氧化铝、假一水软铝石,无毒、无味、无臭、白色胶体状(湿品)或粉末(干品),晶相纯度高、胶溶性能好,粘结性强,具有比表面高、孔容大等特点,其含水态为触变性凝胶。 [0002] Also known as pseudoboehmite alumina monohydrate boehmite, pseudo boehmite a non-toxic, tasteless, odorless, white colloidal (wet) or a powder (dry product), high-crystal phase purity, gum good melting properties, strong adhesion, having a high specific surface area, pore volume and other characteristics, which form the aqueous thixotropic gel.

[0003] 拟薄水铝石的生产方法有多种:目前国外常采用醇铝法,产品质量高且孔结构很容易控制,但是生产成本高,存在环境污染;目前国内最经济、应用最广的是酸法或碱法。 [0003] The method of producing quasi boehmite are more of: aluminum alkoxides in foreign countries, often used method, high product quality and pore structure is easily controlled, but the high production costs, the presence of environmental pollution; currently the most economical and most widely It is acid or soda process. 工业上拟薄水铝石的生产方法主要包括如下三种: The method of producing quasi boehmite in the industry includes the following three types:

[0004] (I)铝盐和碱的中和: [0004] (I) and the aluminum salt and a base:

[0005] A1C13+3NH30H->A1 (OH) 3+3NH4Cl [0005] A1C13 + 3NH30H-> A1 (OH) 3 + 3NH4Cl

[0006] (2)铝盐和偏铝酸钠的复分解反应法: [0006] (2) an aluminum salt and sodium aluminate metathesis reaction method:

[0007] Al2 (SO4) 3+6NaA102 + 12H20->8A1 (OH) 3 + 3Na2S04 [0007] Al2 (SO4) 3 + 6NaA102 + 12H20-> 8A1 (OH) 3 + 3Na2S04

[0008] (3)偏铝酸钠和酸的中和,如碳化法: [0008] (3) sodium aluminate and acid neutralization, as carbonization:

[0009] 2NaA102 + CO2 + 3H20->2A1 (OH) 3 + Na2CO3 [0009] 2NaA102 + CO2 + 3H20-> 2A1 (OH) 3 + Na2CO3

[0010] 其中,碳化法生产拟薄水铝石的过程如下:以低温低浓度的工业铝酸钠溶液为原料,快速通入高浓度CO2气体作为沉淀剂中和成胶,控制成胶温度及终点的pH值,然后经升温、老化、洗涤、干燥,得到普通拟薄水铝石产品。 [0010] wherein carbonization quasi boehmite production process is as follows: the industrial sodium aluminate solution to low temperature and low concentration of raw material, into a high concentration of fast CO2 gas as a precipitating agent and gelation, and control the gelation temperature the pH of the end point, and then by heating, aging, washed, and dried, to give ordinary quasi boehmite product.

[0011] 碳化法制备拟薄水铝石可以依托氧化铝厂,原料来源广泛、生产成本低,生产中的废液可以返回氧化铝生产流程再利用,基本无废料排出,环境污染小,由此得到了广泛的应用。 Pseudo [0011] SYSTEM carbonation can rely boehmite alumina plant, widely available raw material, low production cost, the waste liquid produced in the production process can be recycled to return alumina, substantially no waste discharge, environmental pollution, thereby It has been widely used. 但是,碳化法制备拟薄水铝石的过程多为间断生产,设备投资大、人员劳动强度大、生产率低,产品质量波动大。 However, the process of carbonization Preparation Method quasi boehmite more intermittent production, equipment investment, high labor intensity, low productivity, large fluctuations in product quality.

发明内容 SUMMARY

[0012] 为了解决现有碳化法制备拟薄水铝石的间断生产,劳动强度大、生产率低,以及产品质量波动大等问题,本发明提供了一种连续生产拟薄水铝石的方法,包括: [0012] In order to solve the conventional quasi prepared by carbonization of discontinuous boehmite production, labor-intensive, low productivity, and fluctuations in product quality and other issues, the present invention provides a method for the continuous production of quasi boehmite, include:

[0013] 将偏铝酸钠溶液连续地加入到反应装置中,并将空气和二氧化碳的混合气体通入到所述反应装置中,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合;控制混合气体和偏铝酸钠溶液的流量,使反应生成的料浆温度为25-55°C,pH值为9.5-11 ;将反应所得的料浆通过具有多个u型弯的管道输送至老化槽,料浆进行老化、过滤、水洗至中性及干燥处理,得到拟薄水铝石。 [0013] The sodium aluminate solution was continuously added to the reaction apparatus, and the mixed gas of air and carbon dioxide into the reaction unit to the sodium aluminate solution stream and form a strong carbon dioxide gas sufficiently mixing; and controlling the mixed gas flow rate of the sodium aluminate solution, the slurry produced by the reaction temperature is 25-55 ° C, pH value of 9.5-11; the resulting reaction slurry through a conduit having a plurality of u-bend delivered to the aging tank, the slurry was aged, filtered, washed with water until neutral and dried to give a quasi boehmite.

[0014] 所述偏铝酸钠溶液的氧化铝浓度为15-80g/L。 [0014] The concentration of alumina is sodium aluminate solution 15-80g / L.

[0015] 所述料浆经过老化、过滤、水洗至中性及干燥处理的步骤具体包括: [0015] After the slurry aged, filtered, washed with water until neutral and drying process step comprises:

[0016] 料浆经过含有多个u型弯的管道后进入老化槽升温,控制老化温度不低于90°C ; [0016] After the slurry containing a plurality of u-bend pipe into the aging tank temperature rise, controlling the aging temperature not lower than 90 ° C;

[0017] 将老化升温后的料浆过滤,滤饼水洗至中性;[0018] 将水洗后的滤饼进行干燥处理。 [0017] The heated slurry after aging was filtered, the filter cake was washed with water until neutral; [0018] The filter cake was washed with water after the drying process.

[0019] 所述干燥处理的干燥温度为100-120°C。 The [0019] drying temperature of the drying treatment is 100-120 ° C.

[0020] 所述混合气体中二氧化碳的体积百分数为30%-100%,所述混合气体的压力为0.1MPa -0.3MPa。 [0020] The volume percentage of carbon dioxide in the mixed gas of 30% to 100%, the mixed gas pressure was 0.1MPa -0.3MPa.

[0021] 所述混合气体和偏铝酸钠溶液的流量比值为10-100。 The [0021] mixture gas flow rate ratio and the sodium aluminate solution is 10-100.

[0022] 本发明的方法具有连续生产、工艺简单、生产效率高、产品质量稳定、设备投资少、操作维护简便、运行可靠、能耗低及劳动强度小等特点,特别适用于普通拟薄水铝石或超细氢氧化铝、氧化铝的生产。 [0022] The method of the present invention having a continuous production process is simple, high production efficiency, product quality and stability, low investment, operation and maintenance is simple, reliable, low energy consumption and labor intensity and other characteristics, especially suitable for general pseudoboehmite ultrafine boehmite or aluminum hydroxide, alumina production. 通过本发明方法所制备的拟薄水铝石,比表面积大、孔容、胶溶合理。 Quasi-boehmite prepared by the process of the present invention, large specific surface area, pore volume, peptization reasonable.

附图说明 BRIEF DESCRIPTION

[0023] 图1是本发明实施例的连续生产拟薄水铝石的方法流程图。 [0023] FIG. 1 is a quasi boehmite method flowchart continuous production of an embodiment of the present invention.

具体实施方式 detailed description

[0024] 下面结合附图和实施例,对本发明技术方案作进一步描述。 [0024] accompanying drawings and the following embodiments, the technical solutions of the present invention will be further described.

[0025] 参见图1,本发明实施例提供了一种连续生产拟薄水铝石的方法,该方法包括如下步骤: [0025] Referring to Figure 1, embodiments of the present invention provides a process for the continuous production of quasi boehmite, the method comprising the steps of:

[0026] 步骤101:将偏铝酸钠溶液连续地加入到反应装置中,并将空气和二氧化碳的混合气体通入到该反应装置中,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合,产生多而细腻的气泡; [0026] Step 101: The sodium aluminate solution was continuously added to the reaction apparatus, and the mixed gas of air and carbon dioxide into the reaction apparatus to the sodium aluminate solution stream and form a strong carbon dioxide gas thoroughly mixed, and multiple fine bubbles generated;

[0027] 本实施例中,偏铝酸钠溶液的氧化铝浓度为15-80g/L ;混合气体中二氧化碳的体积百分数为30%-100%,混合气体的压力为0.1MPa-0.3MPa ; [0027] In this embodiment, the alumina concentration of sodium aluminate solution is 15-80g / L; volume percentage of carbon dioxide in the mixed gas of 30% to 100%, pressure of the mixed gas is 0.1MPa-0.3MPa;

[0028] 步骤102:控制混合气体和偏铝酸钠溶液的流量比值在10-100,使反应生成的料浆温度为25-55°C,pH值为9.5-11,停止成胶; [0028] Step 102: the control gas mixture and sodium aluminate solution flow rate ratio of 10-100, the temperature of the slurry produced by the reaction is 25-55 ° C, pH value of 9.5 to 11, stopping gelation;

[0029] 步骤103:将反应所得的料浆通过足够长且具有多个u型弯的管道输送至老化槽,料浆经过老化、过滤、水洗至中性及干燥处理,得到拟薄水铝石。 [0029] Step 103: The resulting reaction slurry was transported through sufficiently long and having a plurality of u-bend pipe to the aging tank, the slurry after the aging was filtered, washed with water until neutral and dried to give a quasi boehmite .

[0030] 本实施例中,将料浆通过足够长且具有多个U型弯的管道输送至老化槽升温,控制老化温度不低于90°C;将老化升温后的料浆过滤,滤饼水洗至中性;再将水洗后的滤饼进行干燥处理,干燥温度为100-120°C,最终得到拟薄水铝石。 [0030] In this embodiment, the slurry is conveyed by means of sufficient length and having a plurality of U-bend tubing to the aging tank temperature rise control aging temperature not lower than 90 ° C; the slurry after the aging was filtered warm and the filter cake washed with water until neutral; cake was washed with water and then dried, the drying temperature is 100-120 ° C, to give the final quasi boehmite.

[0031] 为了更加清楚地阐述本发明实施例的连续生产拟薄水铝石的方法,下面通过几个典型的应用实施例来进一步说明。 [0031] In order to more clearly set forth in the continuous production method of an embodiment of the present invention is intended to boehmite, by the following examples several typical application is further illustrated.

[0032] 实施例1 [0032] Example 1

[0033] 将氧化铝浓度为15.3g/L的偏铝酸钠溶液通过泵连续地加入到反应装置中,通入空气和二氧化碳的混合气体,混合气体中二氧化碳的体积百分数为30%,混合气体的压力为0.1MPa,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合,产生多而细腻的气泡;控制混合气体和偏铝酸钠溶液的流量比值为10,使反应生成的料浆温度为25°C及pH值为9.5时,停止成胶;将反应所得的料浆通过足够长且具有多个u型弯的管道输送至老化槽,浆料在老化槽内升温,老化温度为90°C;将老化后的料浆过滤,滤饼水洗至中性;将水洗后的滤饼进行烘干处理,烘干温度为100°C,最终得到普通拟薄水铝石产品,其物化性质见下表I。 [0033] The alumina concentration of 15.3g / L of sodium aluminate solution was continuously added to the reaction means via a pump, through a mixed gas of air and carbon dioxide, the volume percentage of the mixed gas of 30% carbon dioxide, a mixed gas a pressure of 0.1MPa, to make a solution of sodium aluminate with carbon dioxide to form a strong flow of mixed gas, and produce multiple fine bubbles; and controlling the flow rate ratio of a mixed gas of sodium aluminate solution was 10, that the reaction of the slurry temperature was 25 ° C and a pH of 9.5, the gelation is stopped; the resulting reaction slurry delivered to the aging tank by having a sufficient length and a plurality of u-bend pipe, heating the slurry in the aging tank, the aging temperature of 90 ° C; the slurry after aging was filtered, the filter cake was washed with water to neutrality; the filter cake was washed with water after the drying process, the drying temperature is 100 ° C, to give the final ordinary quasi boehmite product, its physical and chemical properties following table I.

[0034] 实施例2 [0034] Example 2

[0035] 将氧化铝浓度为23.5g/L的偏铝酸钠溶液通过泵连续地加入到反应装置中,通入空气和二氧化碳的混合气体,混合气体中二氧化碳的体积百分数为40%,混合气体的压力为0.12MPa,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合,产生多而细腻的气泡;控制混合气体和偏铝酸钠溶液的流量比值为30,使反应生成的料浆温度为30°C及pH值为9.5时,停止成胶;将反应所得的料浆通过足够长且具有多个u型弯的管道输送至老化槽,浆料在老化槽内升温,老化温度为95°C;将老化后的料浆过滤,滤饼水洗至中性;将水洗后的滤饼进行烘干处理,烘干温度为102°C,最终得到普通拟薄水铝石产品,其物化性质见下表I。 [0035] The alumina concentration of 23.5g / L of sodium aluminate solution was added to the reaction system continuously by a pump, the mixed gas into carbon dioxide and air, the volume percentage of the mixed gas of 40% carbon dioxide, a mixed gas pressure of 0.12MPa, so that a solution of sodium aluminate with carbon dioxide to form a strong flow of mixed gas, and produce multiple fine bubbles; and controlling the flow rate ratio of a mixed gas of sodium aluminate solution at 30 the reaction of the slurry temperature was 30 ° C and a pH of 9.5, the gelation is stopped; the resulting reaction slurry delivered to the aging tank by having a sufficient length and a plurality of u-bend pipe, heating the slurry in the aging tank, the aging temperature of 95 ° C; the slurry after aging was filtered, the filter cake was washed with water to neutrality; the filter cake was washed with water after the drying process, the drying temperature is 102 ° C, to give the final ordinary quasi boehmite product, its physical and chemical properties following table I.

[0036] 实施例3 [0036] Example 3

[0037] 将氧化铝浓度为35.3g/L的偏铝酸钠溶液通过泵连续地加入到反应装置中,通入空气和二氧化碳的混合气体,混合气体中二氧化碳的体积百分数为50%,混合气体的压力为 [0037] The alumina concentration of 35.3g / L of sodium aluminate solution was continuously added to the reaction means via a pump, through a mixed gas of air and carbon dioxide, the volume percentage of the mixed gas of 50% carbon dioxide, a mixed gas pressure of

0.15MPa,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合,产生多而细腻的气泡;控制混合气体和偏铝酸钠溶液的流量比值为40,使反应生成的料浆温度为35°C及pH值为10时,停止成胶;将反应所得的料浆通过足够长且具有多个u型弯的管道输送至老化槽,浆料在老化槽内升温,老化温度为100°C ;将老化后的料浆过滤,滤饼水洗至中性;将水洗后的滤饼进行烘干处理,烘干温度为102°C,最终得到普通拟薄水铝石产品,其物化性质见下表I。 Of 0.15 MPa, so that a solution of sodium aluminate with carbon dioxide to form a strong flow of mixed gas, and produce multiple fine bubbles; and controlling the flow rate ratio of a mixed gas of sodium aluminate solution was 40, the temperature of the slurry resulting reaction value of 35 ° C and pH 10 is stopped when the gelation; the resulting reaction slurry by a sufficient length and having a plurality of u-bend piped to the aging tank, heating the slurry in the aging tank, the aging temperature is 100 ° C; the slurry after aging was filtered, the filter cake was washed with water to neutrality; the filter cake was washed with water after the drying process, the drying temperature is 102 ° C, to give the final ordinary quasi boehmite product which physicochemical properties the following table I.

[0038] 实施例4 [0038] Example 4

[0039] 将氧化铝浓度为43.lg/L的偏铝酸钠溶液通过泵连续地加入到反应装置中,通入空气和二氧化碳的混合气体,混合气体中二氧化碳的体积百分数为60%,混合气体的压力为 [0039] The alumina concentration of 43.lg / L of sodium aluminate solution added continuously via a pump into the reaction apparatus, a gas mixture of air and carbon dioxide, the volume percentage of the mixed gas of 60% carbon dioxide, mixed pressure gas is

0.2MPa,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合,产生多而细腻的气泡;控制混合气体和偏铝酸钠溶液的流量比值为50,使反应生成的料浆温度为40°C及pH值为10时,停止成胶;将反应所得的料浆通过足够长且具有多个u型弯的管道输送至老化槽,浆料在老化槽内升温,老化温度为98°C;将老化后的料浆过滤,滤饼水洗至中性;将水洗后的滤饼进行烘干处理,烘干温度为110°C,最终得到普通拟薄水铝石产品,其物化性质见下表I。 0.2MPa, so that a solution of sodium aluminate with carbon dioxide to form a strong flow of mixed gas, and produce multiple fine bubbles; and controlling the flow rate ratio of a mixed gas of sodium aluminate solution was 50, the temperature of the slurry resulting reaction 40 ° C for a value of pH 10 and is stopped when gelation; the resulting reaction slurry by a sufficient length and having a plurality of u-bend piped to the aging tank, heating the slurry in the aging tank, the aging temperature is 98 ° C; the slurry after aging was filtered, the filter cake was washed with water to neutrality; the filter cake was washed with water after the drying process, the drying temperature is 110 ° C, to give the final ordinary quasi boehmite product which physicochemical properties the following table I.

[0040] 实施例5 [0040] Example 5

[0041] 将氧化铝浓度为51.9g/L的偏铝酸钠溶液通过泵连续地加入到反应装置中,通入空气和二氧化碳的混合气体,混合气体中二氧化碳的体积百分数为70%,混合气体的压力为 [0041] The alumina concentration of 51.9g / L of sodium aluminate solution was continuously added to the reaction means via a pump, through a mixed gas of air and carbon dioxide, the volume percentage of the mixed gas of 70% carbon dioxide, a mixed gas pressure of

0.25MPa,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合,产生多而细腻的气泡;控制混合气体和偏铝酸钠溶液的流量比值为60,使反应生成的料浆温度为45°C和pH值为11时,停止成胶;将反应所得的料浆通过足够长且具有多个u型弯的管道输送至老化槽,浆料在老化槽内升温,老化温度为97°C;将老化后的料浆过滤,滤饼水洗至中性;将水洗后的滤饼进行烘干处理,烘干温度为115°C,最终得到普通拟薄水铝石产品,其物化性质见下表I。 0.25MPa, so that a solution of sodium aluminate with carbon dioxide to form a strong flow of mixed gas, and produce multiple fine bubbles; and controlling the flow rate ratio of a mixed gas of sodium aluminate solution was 60, the temperature of the slurry resulting reaction to 45 ° C and a pH of 11, to stop acacia; the resulting slurry was delivered to the reaction tank by aging is sufficiently long and having a plurality of u-bend pipe, heating the slurry in the aging tank, the aging temperature is 97 ° C; the slurry after aging was filtered, the filter cake was washed with water to neutrality; the filter cake was washed with water after the drying process, the drying temperature is 115 ° C, to give the final ordinary quasi boehmite product which physicochemical properties the following table I.

[0042] 实施例6 [0042] Example 6

[0043] 将氧化铝浓度为67.4g/L的偏铝酸钠溶液通过泵连续地加入到反应装置中,通入空气和二氧化碳的混合气体,混合气体中二氧化碳的体积百分数为80%,混合气体的压力为 [0043] The alumina concentration of 67.4g / L of sodium aluminate solution was continuously added to the reaction means via a pump, through a mixed gas of air and carbon dioxide, the volume percentage of the mixed gas of 80% carbon dioxide, a mixed gas pressure of

0.3MPa,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合,产生多而细腻的气泡;控制混合气体和偏铝酸钠溶液的流量比值为80,使反应生成的料浆温度为50°C及pH值为11时,停止成胶;将反应所得的料浆通过足够长且具有多个u型弯的管道输送至老化槽,浆料在老化槽内升温,老化温度为93°C;将老化后的料浆过滤,滤饼水洗至中性;将水洗后的滤饼进行烘干处理,烘干温度为120°C,最终得到普通拟薄水铝石产品,其物化性质见下表I。 0.3MPa, so that a solution of sodium aluminate with carbon dioxide to form a strong flow of mixed gas, and produce multiple fine bubbles; and controlling the flow rate ratio of a mixed gas of sodium aluminate solution was 80, the temperature of the slurry resulting reaction to 50 ° C and a pH of 11, to stop acacia; the resulting slurry was delivered to the reaction tank by aging is sufficiently long and having a plurality of u-bend pipe, heating the slurry in the aging tank, the aging temperature is 93 ° C; the slurry after aging was filtered, the filter cake was washed with water to neutrality; the filter cake was washed with water after the drying process, the drying temperature is 120 ° C, to give the final ordinary quasi boehmite product which physicochemical properties the following table I.

[0044] 实施例7 [0044] Example 7

[0045] 将氧化铝浓度为78.83g/L的偏铝酸钠溶液通过泵连续地加入到反应装置中,通入空气和二氧化碳的混合气体,混合气体中二氧化碳的体积百分数为100%,混合气体的压力为0.3MPa,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合,产生多而细腻的气泡;控制混合气体和偏铝酸钠溶液的流量比值为100,使反应生成的料浆温度为55°C及pH值为10.5时,停止成胶;将反应所得的料浆通过足够长且具有多个u型弯的管道输送至老化槽,浆料在老化槽内升温,老化温度为94°C ;将老化后的料浆过滤,滤饼水洗至中性;将水洗后的滤饼进行烘干处理,烘干温度为120°C,最终得到普通拟薄水铝石产品,其物化性质见下表I。 [0045] The alumina concentration of 78.83g / L of sodium aluminate solution was continuously added to the reaction means via a pump, through a mixed gas of air and carbon dioxide, the volume percentage of the mixed gas is 100% carbon dioxide, a mixed gas a pressure of 0.3MPa, to make a solution of sodium aluminate with carbon dioxide to form a strong flow of mixed gas, and produce multiple fine bubbles; and controlling the flow rate ratio of a mixed gas of sodium aluminate solution was 100, the reaction generated the slurry temperature was 55 ° C and a pH of 10.5, stopping gelation; the resulting reaction slurry delivered to the aging tank by having a sufficient length and a plurality of u-bend pipe, heating the slurry in the aging tank, the aging temperature of 94 ° C; the slurry after aging was filtered, the filter cake was washed with water to neutrality; the filter cake was washed with water after the drying process, the drying temperature is 120 ° C, to give the final ordinary quasi boehmite product, its physical and chemical properties following table I.

[0046]表 I [0046] TABLE I

[0047] [0047]

Figure CN103449484AD00061

[0048] 由表I可以看出,通过本实施例的方法所制备的拟薄水铝石,比表面积大、孔容、胶溶合理。 [0048] As can be seen from Table I, quasi-boehmite prepared by the method of the present embodiment, the large specific surface area, pore volume, peptization reasonable. 表I中孔容和比表面积的分析,可以采用低温液氮吸附法来完成。 Table I pore volume and specific surface area analysis can be employed to complete the N2 adsorption method. (注:普通拟薄水铝石质量标准Q/Chalco A020—2004中,胶溶≥95%,比表面≥250m2/g,孔容≥0.3ml/L) (Note: Quasi Normal standard boehmite mass Q / Chalco A020-2004, the peptized ≥95%, specific surface ≥250m2 / g, a pore volume ≥0.3ml / L)

[0049] 本实施例用泵连续地将偏铝酸钠溶液加入到反应装置中,足够长且具有多个U型弯的输送管道保证了碳化反应的充分进行,克服了拟薄水铝石间断生产的缺陷,具有连续生产、工艺简单、设备投资少、操作维护简便、运行可靠、能耗低及劳动强度小等特点,提高了劳动生成率,稳定了产品质量,特别适用于普通拟薄水铝石或超细氢氧化铝、氧化铝的生产。 [0049] The embodiment of a pump according to the present embodiment continuously sodium aluminate solution was added to the reaction apparatus, having a sufficient length and a plurality of U-bend of the pipeline to ensure that the carbonation reaction sufficiently, to overcome the quasi boehmite intermittent defect production, continuous production process is simple, less equipment investment, operation and maintenance is simple, reliable, low energy consumption and labor intensity and other characteristics, improve labor production rate, stable product quality, especially for general pseudoboehmite ultrafine boehmite or aluminum hydroxide, alumina production.

[0050] 以上所述的具体实施例,对本发明的目的、技术方案和有益效果进行了进一步详细说明,所应理解的是,以上所述仅为本发明的具体实施例而已,并不用于限制本发明,凡在本发明的精神和原则之内,所做的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。 Specific Example [0050] above, the objectives, technical solutions, and beneficial effects of the present invention will be further described in detail, it should be understood that the above descriptions are merely embodiments of the present invention, but not intended to limit the present invention, within the spirit and principle of the present invention, any modifications, equivalent replacements, improvements, etc., should be included within the scope of the present invention.

Claims (6)

  1. 1.一种连续生产拟薄水铝石的方法,其特征在于,包括: 将偏铝酸钠溶液连续地加入到反应装置中,并将空气和二氧化碳的混合气体通入到所述反应装置中,使偏铝酸钠溶液形成强劲的液流与二氧化碳气体进行充分混合;控制混合气体和偏铝酸钠溶液的流量,使反应生成的料浆温度为25-55°C,pH值为9.5-11 ;将反应所得的料浆通过具有多个u型弯的管道输送至老化槽,料浆经过老化、过滤、水洗至中性及干燥处理,得到拟薄水铝石。 1. A continuous process for producing quasi boehmite, characterized in that, comprising: a sodium aluminate solution are continuously added to the reactor, and the mixed gas of air and carbon dioxide passed into the reaction unit the sodium aluminate solution with carbon dioxide to form a strong flow of mixed gas; gas flow rate and controlling the mixing sodium aluminate solution, the slurry produced by the reaction temperature is 25-55 ° C, pH value 9.5 11; the resulting reaction slurry through a conduit having a plurality of transport u-bend to the aging tank, the slurry after the aging was filtered, washed with water until neutral and dried to give a quasi boehmite.
  2. 2.如权利要求1所述的连续生产拟薄水铝石的方法,其特征在于,所述偏铝酸钠溶液的氧化铝浓度为15-80g/L。 2. The method of quasi boehmite continuous production according to claim 1, wherein said biasing sodium aluminate solution alumina concentration of 15-80g / L.
  3. 3.如权利要求1所述的连续生产拟薄水铝石的方法,其特征在于,所述料浆经过老化、过滤、水洗至中性及干燥处理的步骤具体包括: 将料浆通入老化槽升温,控制老化温度不低于90°C ; 将老化升温后的料浆过滤,滤饼水洗至中性; 将水洗后的滤饼进行干燥处理。 Continuous production as claimed in claim 1 and Pseudo boehmite claims, characterized in that, after the slurry aged, filtered, washed with water until neutral and drying process comprises the step of: aging the slurry into heating tank, controlling the aging temperature not lower than 90 ° C; the slurry after the aging was filtered warm and the filter cake washed with water to neutrality; the filter cake was washed with water after the drying process.
  4. 4.如权利要求3所述的连续生产拟薄水铝石的方法,其特征在于,所述干燥处理的干燥温度为100-120°C。 4. The method of quasi boehmite continuous production according to claim 3, wherein the drying temperature of the drying treatment is 100-120 ° C.
  5. 5.如权利要求1所述的连续生产拟薄水铝石的方法,其特征在于,所述混合气体中二氧化碳的体积百分数为30%-100% ,所述混合气体的压力为0.1MPa-0.3MPa。 5. The method of quasi boehmite continuous production according to claim 1, wherein the volume percentage of carbon dioxide in the mixed gas of 30% to 100%, the mixed gas pressure of 0.1MPa-0.3 MPa.
  6. 6.如权利要求1所述的连续生产拟薄水铝石的方法,其特征在于,所述混合气体和偏铝酸钠溶液的流量比值为10-100。 The continuous production method of a quasi boehmite as claimed in claim 6., characterized in that the mixing ratio of gas and the flow rate of the sodium aluminate solution is 10-100.
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CN104959091A (en) * 2015-06-08 2015-10-07 辽宁石油化工大学 Carbonization synthesis system and application of same in preparation of pseudo-boehmite, and preparation method for pseudo-boehmite
CN104973613A (en) * 2015-06-25 2015-10-14 厦门大学 Method for continuously producing aluminum oxide by using carbonation method
CN105600812A (en) * 2015-12-24 2016-05-25 江苏晶晶新材料有限公司 Method for preparing high-viscosity and superfine pseudo boehmite coating adhesive

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CN2616525Y (en) * 2003-03-10 2004-05-19 中国石油化工股份有限公司 Reactor for preparing aluminium hydroxide
CN1583568A (en) * 2004-06-03 2005-02-23 山东铝业股份有限公司 Preparation of pseudo thinolite
CN101172631A (en) * 2007-11-09 2008-05-07 中国铝业股份有限公司 Method of producing pseudo boehmite

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US4492682A (en) * 1982-01-29 1985-01-08 Rhone-Poulenc Specialites Chimiques Preparation of ultrapure boehmites and/or pseudo-boehmites
CN85100161A (en) * 1985-04-01 1986-07-30 山东省铝厂 Carbonation process (co2 process) for producing pseudoboehmite
CN2616525Y (en) * 2003-03-10 2004-05-19 中国石油化工股份有限公司 Reactor for preparing aluminium hydroxide
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Publication number Priority date Publication date Assignee Title
CN104959091A (en) * 2015-06-08 2015-10-07 辽宁石油化工大学 Carbonization synthesis system and application of same in preparation of pseudo-boehmite, and preparation method for pseudo-boehmite
CN104973613A (en) * 2015-06-25 2015-10-14 厦门大学 Method for continuously producing aluminum oxide by using carbonation method
CN105600812A (en) * 2015-12-24 2016-05-25 江苏晶晶新材料有限公司 Method for preparing high-viscosity and superfine pseudo boehmite coating adhesive

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