WO2007045154A1 - Alumina digesting apparatus - Google Patents

Alumina digesting apparatus Download PDF

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Publication number
WO2007045154A1
WO2007045154A1 PCT/CN2006/002701 CN2006002701W WO2007045154A1 WO 2007045154 A1 WO2007045154 A1 WO 2007045154A1 CN 2006002701 W CN2006002701 W CN 2006002701W WO 2007045154 A1 WO2007045154 A1 WO 2007045154A1
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Prior art keywords
pressure
dissolution
specifications
flasher
alumina
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PCT/CN2006/002701
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French (fr)
Chinese (zh)
Inventor
De Chen
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China Aluminum International Engineering Corporation Limited
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Priority to BRPI0617714-0B1A priority Critical patent/BRPI0617714B1/en
Publication of WO2007045154A1 publication Critical patent/WO2007045154A1/en

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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B3/00—Extraction of metal compounds from ores or concentrates by wet processes
    • C22B3/02—Apparatus therefor
    • 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
    • C01F7/06—Preparation of alkali metal aluminates; Aluminium oxide or hydroxide therefrom by treating aluminous minerals or waste-like raw materials with alkali hydroxide, e.g. leaching of bauxite according to the Bayer process
    • C01F7/062—Digestion
    • C01F7/064—Apparatus for digestion, e.g. digestor vessels or heat exchangers
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B21/00—Obtaining aluminium
    • C22B21/0015—Obtaining aluminium by wet processes
    • 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
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Definitions

  • This invention relates to alumina production equipment, and more particularly to dissolution apparatus for alumina production.
  • the large-scale equipment is the development trend of the alumina industry at home and abroad. It can increase the alumina plant capacity, automation equipment level and labor productivity, improve technical and economic indicators, and reduce consumption.
  • the Bayer process alumina plant which is newly built using Sanshui bauxite as a raw material, has a production capacity of 700-900 kt/year alumina.
  • Dissolution is the core process in the alumina production process.
  • the domestic alumina plant Bayer process production system uses a maximum capacity of 450kt/year.
  • a set of original pulp by volume dissolution apparatus is 460 ⁇ 470m 3 / h, the two dissolution apparatus for producing alumina a year, more than 900,000 Tuen p.
  • alumina plant can be further developed in the direction of large-scale is the key to whether the dissolution device can be further enlarged.
  • the invention combines the current alumina production situation and the development trend of the alumina industry, studies the dissolution device, and proposes a new large-scale dissolution device and a matching scheme, and the raw slurry amount that the dissolution device can pass is 52 0 ⁇ 550 m 3 /h, can increase alumina production capacity to 500kt / year.
  • the object of the present invention is to provide a new large-scale dissolution apparatus which can increase the existing dissolution apparatus having an alumina capacity of 450 kt/year to 500 kt/year, thereby further increasing the size of the dissolution apparatus.
  • the invention is implemented as follows: It comprises the following equipment:
  • heating tube bundle cooker 15 or 16 units (with 13 or 14 units, 2 units), design pressure 5.2Mpa, pressure cooker specifications: ⁇ 3 X 18m;
  • cooker 4 or 5 sets, design pressure 5.2Mpa, cooker specifications: ⁇ 3> ⁇ 18 ⁇ ;
  • the above equipment is connected by pipes in the order of the dissolution process.
  • the equipment given above contains the necessary equipment for the process, including: 1 high-pressure diaphragm pump; 2 sets of boilers with heating tube bundles, 2 sets of flashers (so 2 sets of 12 flashers) Form a ten-level flash process).
  • the main technical indicators of the new dissolution apparatus are: circulating mother liquor: Na 2 0 K 230 ⁇ 250g/l, R P 0.53 - 0.60; raw pulp temperature: 85 ⁇ 96 dissolution temperature: 255-262 °C; dissolution time: 30 ⁇ 60min; Alumina dissolution rate: >93%; Eluent R P : 1.15- 1.20; Dissolution red mud-base ratio: 0.28 ⁇ 0.40; Last stage self-evaporation temperature: 127-135; Dissolution apparatus operating rate: >9 3 %; Diluent The residence time of the tank after dissolution: 3.5 ⁇ 4.5h.
  • the alumina capacity can reach 450 kt / year. If the raw slurry of the dissolution device passes With a capacity of 525 m 3 /h, the alumina capacity can reach 500 kt/year.
  • the novel dissolution apparatus of the invention can pass the raw slurry of 5 2 5 ⁇ 5 50 m 3 / h, and the basis thereof is as follows:
  • high-pressure diaphragm pump the domestic alumina industry in the Netherlands GEHO this process usually produced by high pressure diaphragm pumps, now the company's new diaphragm pump its maximum flow up to 550m 3 / h, can meet this primary section Pulp flow requirements; diaphragm pumps with flow rates of 250 ⁇ 300m 3 /h can also be used, and two pumps can be used to feed the dissolution device at the same time; domestic pumps of the same type can also be used.
  • casing preheater ⁇ , inner casing diameter D325xl3, when passing 525 ⁇ 550m 3 /h raw slurry, the slurry flow rate is 2.08 ⁇ 2.18m / s, according to the principles of fluid mechanics and Industry experience, when the original slurry in the tube flow rate is in the range of 2.0 ⁇ 2.5m / s, the casing preheater can achieve the best heat transfer effect, and it is not easy to generate scars in the pipe.
  • the heat transfer area, the jacket preheater, the total heat transfer area (calculated as the inner diameter of the inner tube) is 3174 m 2 , and the total heat transfer area of the original 450 kt / year casing preheater is 2595 m 2 , increasing The size is 22.3%, so the heat transfer area is sufficient to meet the 500kt/year alumina scale.
  • pulse buffer The volume increased by 17.3%, which can meet the 500kt/year alumina production requirements.
  • the volume of the cooker is 100m 3 /set
  • the volume of the existing cooker is 8:3 m 3 /set
  • each volume increases by 20.5%.
  • the heat transfer area of the cooker with heating tube is 540m 2
  • the heat transfer area of the cooker is 610m 2
  • the volume of the cooker and the heat transfer area are both Can meet the 500kt / year alumina production requirements.
  • Flash evaporator There are 12 flash evaporators in this dissolution apparatus.
  • the existing 450kt/year dissolution apparatus has a flasher size of (
  • the flasher of this dissolution apparatus adjusts it to ⁇ 3.5 ⁇ 5.5 9.7m, the cross-sectional area of each flasher increased by 21.0 - 36.1%, which can meet the 500kt / year alumina production requirements.
  • the main equipment of the novel dissolution apparatus of the present invention is subjected to capacity review, and its alumina production capacity can fully meet the needs of 500 kt/year.
  • the raw slurry from the raw material mill or atmospheric desiliconization process is pumped into the high pressure diaphragm pump, and the raw slurry is sent to the first pulse buffer through the high pressure diaphragm pump, and then into the 5-6 stage casing preheater.
  • the original slurry enters the 4 ⁇ 5 preheating cooker, preheating the original slurry temperature to about 200 ,, and then heating it into the reaction digester with new steam, and the temperature is raised to 255 ⁇ 262 ⁇ normal dissolution temperature requirements, followed by thermal insulation dissolution residence time 30 ⁇ 60min, after the dissolution, the slurry enters the slurry from the evaporator, and the temperature is reduced from 255 ⁇ 260 "C to 127 ⁇ 135 ⁇ , and then the temperature is from 255 ⁇ 260 "C to 127 ⁇ 135 ⁇ , and then sent to the dilution tank, and the red mud washing liquid from the sedimentation workshop.
  • the post-dissolution trough is sent, and the diluted slurry is left in the trough after the dissolution for about 4 hours to remove impurities such as silicon and iron in the solution, and then sent to the sedimentation workshop.
  • connection mode of each device of the dissolution device is:
  • the high pressure diaphragm pump is connected with the first pulse buffer (pressure 7.0Mpa)
  • the first pulse buffer is connected with the casing preheater
  • the casing preheater and the second buffers pulse (pressure 5 .2Mpa) is connected
  • a second set of buffers pulse tube bundle with a heating boiler pressure connection with a tube bundle heat Autoclave Autoclave connected with, autoclaving with a set of flash
  • the steamer and the flasher outlet are connected to the dilution tank.
  • the invention has the beneficial effects of: increasing the 450kt/year alumina production scale of each existing dissolution device to 500kt/year or more, which makes the alumina industry of China take a big step forward in the large-scale equipment, further improving China Alumina technical equipment level.
  • Figure 1 is a schematic view of the process flow of the present invention.
  • Embodiments of the invention The following equipment is selected according to the alumina capacity of 500 kt/year:
  • casing preheater preheating with six-stage casing, six per stage, each casing length is 90m, the total length of casing is 3240m; inner casing specification is: D325 x l3 ⁇ 14, outer casing specification is: D402 9 ⁇ 10;
  • pulse buffer 2 sets, the pressure is 5.2Mpa and 7.0Mpa respectively, equipment specifications: ⁇ 2.6 10m, volume 42m 3 ;
  • heating tube bundle cooker 16 sets, design pressure 5.2Mpa, pressure cooker specifications: ⁇ 3 X 18m, volume 100m 3 , heating area 610m 2 ;
  • 5 pressure cooker 5 sets, design pressure 5.2Mpa, cooker specifications: ⁇ 3 ⁇ 18 ⁇ , volume 100m 3 ;
  • the above equipment is connected in series according to the dissolution process sequence to form a complete process of the dissolution process.
  • the main technical indicators of the new dissolution apparatus are: circulating mother liquor: Na 2 0 K 235 ⁇ 245g/l, R P 0.53 - 0.55; raw pulp temperature: 90 ⁇ ; dissolution temperature: 258 ⁇ 262 ⁇ ; dissolution time: 40min; alumina dissolution rate : 93% ⁇ 95%; eluent R P : 1.18 ⁇ 1.20; dissolution ratio of red mud to alkali: 0.28 - 0.38;
  • the final stage self-evaporation temperature 130 ⁇ i: 32°C; the dissolution rate of the dissolution device: 93 % ⁇ 9 6%; the residence time of the solution after the dissolution of the diluent: 4h.

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  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Manufacturing & Machinery (AREA)
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  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
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  • Health & Medical Sciences (AREA)
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Abstract

An alumina digesting apparatus, comprises the following devices: high pressure diaphragm pumps, double-pipe preheaters, pulse buffers, autoclaves with heating tube bundles, autoclaves and flash evaporators. The devices are connected successively by pipes according to leaching process. The apparatus enhances the output of alumina from 450kt/year by existing apparatus to above 500kt/year, so that productivity could be enhanced.

Description

氧化铝溶出装置 技术领域：  Alumina dissolution device Technical field:
本发明涉及氧化铝生产设备， 特别是涉及氧化铝生产的溶出装 置。  This invention relates to alumina production equipment, and more particularly to dissolution apparatus for alumina production.
背景技术：  Background technique:
近十多年来， 我国氧化铝工业在设备大型化方面取得了长足进 步， 目前对于拜尔法氧化铝生产***， 一个生产系列最高产能可达 In the past ten years, China's alumina industry has made great progress in the large-scale equipment. Currently, for the Bayer process alumina production system, the highest production capacity of a production series can be achieved.
400 ~ 450kt/年氧化铝， 比八十年代提高了 5倍以上。 设备的大型化使 我国氧化铝厂产能和技术装备水平大幅度提高， 经济效益明显改善。 400 ~ 450kt / year of alumina, more than 5 times than in the 1980s. The large-scale equipment has greatly improved the production capacity and technical equipment level of China's alumina plants, and the economic benefits have improved significantly.
设备大型化是国内外氧化铝工业发展的趋势， 它能提高氧化铝厂 产能、 自动化装备水平和劳动生产率， 改善技术经济指标、 降低消耗。 国外采用三水铝土矿为原料新建的拜尔法氧化铝厂， 一个生产系列的 产能可达 700 ~ 900kt/年氧化铝。  The large-scale equipment is the development trend of the alumina industry at home and abroad. It can increase the alumina plant capacity, automation equipment level and labor productivity, improve technical and economic indicators, and reduce consumption. The Bayer process alumina plant, which is newly built using Sanshui bauxite as a raw material, has a production capacity of 700-900 kt/year alumina.
近几年来， 国内氧化铝厂通过大量的技术改造， 在原拜尔法一个 生产系列 300kt/年产能的基硇上， 在主体设备未增大的情况下， 已逐 步将产能提高到目前的 400 - 450kt/年。 若要进一步提高产量将非常困 难， 必须开发更大型的设备及装置。  In recent years, the domestic alumina plant has undergone a large number of technological transformations. On the basis of a production capacity of 300 kt/year in the original Bayer process, the production capacity has been gradually increased to the current 400 in the case that the main equipment has not increased. 450 kt / year. It will be very difficult to further increase production, and larger equipment and devices must be developed.
溶出是氧化铝生产过程中的核心工序。 目前国内氧化铝厂拜尔法 生产***， 使用的最大溶出装置产能为 450kt/年 .组。 一组溶出装置 通过的原矿浆量为 460 ~ 470m3/h， 两组溶出装置一年生产氧化铝 90余 万 p屯。 Dissolution is the core process in the alumina production process. At present, the domestic alumina plant Bayer process production system uses a maximum capacity of 450kt/year. A set of original pulp by volume dissolution apparatus is 460 ~ 470m 3 / h, the two dissolution apparatus for producing alumina a year, more than 900,000 Tuen p.
氧化铝厂能否进一步向大型化方向发展， 关键在溶出装置能否进 一步大型化。  Whether the alumina plant can be further developed in the direction of large-scale is the key to whether the dissolution device can be further enlarged.
本发明结合目前氧化铝生产情况和氧化铝工业的发展趋势， 对溶 出装置进行研究， 提出了一种新的大型溶出装置及配套方案， 此溶出 装置能通过的原矿浆量为 520 ~ 550m3/h,可将氧化铝产能提高到 500kt/ 年以上。 The invention combines the current alumina production situation and the development trend of the alumina industry, studies the dissolution device, and proposes a new large-scale dissolution device and a matching scheme, and the raw slurry amount that the dissolution device can pass is 52 0 ~ 550 m 3 /h, can increase alumina production capacity to 500kt / year.
发明内容：  Summary of the invention:
本发明的目的在于： 提出一种新的大型溶出装置， 将现有氧化铝 产能为 450kt/年的溶出装置提高到 500kt/年， 实现溶出装置的进一步大 型化。 本发明是这样实现的： 它包括以下设备： SUMMARY OF THE INVENTION The object of the present invention is to provide a new large-scale dissolution apparatus which can increase the existing dissolution apparatus having an alumina capacity of 450 kt/year to 500 kt/year, thereby further increasing the size of the dissolution apparatus. The invention is implemented as follows: It comprises the following equipment:
①溶出进料泵： 选用高压隔膜泵 2台 （用 1备 1) ， 流量 Q=480 550m3/h, P=6.0 - 7.0 Mpa; (或选择高压隔膜泵 3台， 流量 Q=250 ~ 300m3/h, P=6.0~7.0 Mpa, 生产中用 2备 1。 ) 1 Dissolution feed pump: 2 sets of high pressure diaphragm pump (with 1 preparation 1), flow rate Q=480 550m3/h, P=6.0 - 7.0 Mpa; (or select 3 high pressure diaphragm pumps, flow rate Q=250 ~ 300m 3 /h, P=6.0~7.0 Mpa, 2 in the production.
②套管预热器： 采用六级套管预热， 内套管规格为： D325xl3~ 14, 外套管规格为： D402x9~10;  2 casing preheater: Preheating with six-stage casing, the inner casing specification is: D325xl3~ 14, the outer casing specification is: D402x9~10;
③脉冲緩冲器： 2台， 压力分别为 5.2Mpa和 7.0Mpa， 设备规格： Φ2.6 10m;  3 pulse buffer: 2 sets, the pressure is 5.2Mpa and 7.0Mpa respectively, equipment specifications: Φ2.6 10m;
④带加热管束压煮器： 15或 16台 （用 13或 14台， 备 2台） , 设计 压力 5.2Mpa， 压煮器规格： φ 3 X 18m;  4 with heating tube bundle cooker: 15 or 16 units (with 13 or 14 units, 2 units), design pressure 5.2Mpa, pressure cooker specifications: φ 3 X 18m;
⑤压煮器： 4或 5台， 设计压力 5.2Mpa， 压煮器规格： φ3><18ηι; 5 cooker: 4 or 5 sets, design pressure 5.2Mpa, cooker specifications: φ3><18ηι;
⑥闪蒸器： 共 12台 （用 10台备 2台） ， 6 flasher: a total of 12 sets (with 10 sets of 2 sets),
12 #、 11 #闪蒸器规格: Φ3.5 X 9.7m 压力 3.2Mpa  12 #, 11 #Flasher Specifications: Φ3.5 X 9.7m Pressure 3.2Mpa
10#、 9#闪蒸器规格： Φ3.5 X 9.7m 压力 2.8Mpa  10#, 9# flasher specifications: Φ3.5 X 9.7m pressure 2.8Mpa
8 #闪蒸器规格： Φ3.5 X 9.7m 压力 2.4Mpa  8 #Flasher Specifications: Φ3.5 X 9.7m Pressure 2.4Mpa
7 #闪蒸器规格： Φ4.5 X 9.7m 压力 2.0Mpa  7 #Flasher Specifications: Φ4.5 X 9.7m Pressure 2.0Mpa
6 #闪蒸器规格： Φ4.5 X 9.7m 压力 1.6Mpa  6 #Flasher Specifications: Φ4.5 X 9.7m Pressure 1.6Mpa
5 #闪蒸器规格： Φ4.5 X 9.7m 压力 1.3Mpa  5 #Flasher Specifications: Φ4.5 X 9.7m Pressure 1.3Mpa
4 #闪蒸器规格： Φ4.5 X 9.7m 压力 l.OMpa  4 #Flasher Specifications: Φ4.5 X 9.7m Pressure l.OMpa
3 #闪蒸器规格： Φ5.5 X 9.7m 压力 0.8Mpa  3 #Flasher Specifications: Φ5.5 X 9.7m Pressure 0.8Mpa
2#、 1#闪蒸器规格： φ 5.5 x 9.7m 压力 0.6Mpa  2#, 1# flasher specifications: φ 5.5 x 9.7m pressure 0.6Mpa
以上设备用管道按溶出工艺流程顺序依次连接。  The above equipment is connected by pipes in the order of the dissolution process.
在以上给出的设备中含有工艺上必须的备用设备， 包括： 高压隔 膜泵备 1台； 带加热管束的压煮器备 2台， 闪蒸器备 2台 （故 12台闪蒸 器备 2台后组成十级闪蒸工艺） 。  The equipment given above contains the necessary equipment for the process, including: 1 high-pressure diaphragm pump; 2 sets of boilers with heating tube bundles, 2 sets of flashers (so 2 sets of 12 flashers) Form a ten-level flash process).
新型溶出装置主要技术指标为， 循环母液： Na20K 230~250g/l, RP 0.53 - 0.60; 原矿浆温度： 85 ~ 96 溶出温度： 255- 262 °C; 溶出时间： 30~60min; 氧化铝溶出率： >93%； 溶出液 RP: 1.15- 1.20; 溶出赤泥碱比： 0.28 ~ 0.40; 末级自蒸发温度： 127-135 ; 溶 出装置运转率： >93%； 稀释液溶出后槽停留时间： 3.5~4.5h。 The main technical indicators of the new dissolution apparatus are: circulating mother liquor: Na 2 0 K 230~250g/l, R P 0.53 - 0.60; raw pulp temperature: 85 ~ 96 dissolution temperature: 255-262 °C; dissolution time: 30~60min; Alumina dissolution rate: >93%; Eluent R P : 1.15- 1.20; Dissolution red mud-base ratio: 0.28 ~ 0.40; Last stage self-evaporation temperature: 127-135; Dissolution apparatus operating rate: >9 3 %; Diluent The residence time of the tank after dissolution: 3.5~4.5h.
根据目前拜尔法氧化铝厂的工艺技术指标， 当溶出装置原矿浆通 过量为 470m3/h时， 氧化铝产能可达 450kt/年。 若溶出装置原矿浆通过 量为 525m3/h, 则氧化铝产能可达 500kt/年。 According to the current technical specifications of the Bayer process alumina plant, when the raw slurry throughput of the dissolution plant is 470 m 3 /h, the alumina capacity can reach 450 kt / year. If the raw slurry of the dissolution device passes With a capacity of 525 m 3 /h, the alumina capacity can reach 500 kt/year.
本发明的新型溶出装置， 能够通过 525~550m3/h的原矿浆， 其依 据如下： The novel dissolution apparatus of the invention can pass the raw slurry of 5 2 5 ~ 5 50 m 3 / h, and the basis thereof is as follows:
(1)、高压隔膜泵：国内氧化铝行业在本工序通常采用荷兰 GEHO 公司生产的高压隔膜泵， 现该公司最新推出的隔膜泵其最大流量可达 550m3/h, 完全能满足本工段原矿浆流量要求； 也可采用流量为 250 ~ 300m3/h的隔膜泵， 用 2台泵同时向溶出装置供料； 也可选用国内同类 型泵。 (1), high-pressure diaphragm pump: the domestic alumina industry in the Netherlands GEHO this process usually produced by high pressure diaphragm pumps, now the company's new diaphragm pump its maximum flow up to 550m 3 / h, can meet this primary section Pulp flow requirements; diaphragm pumps with flow rates of 250 ~ 300m 3 /h can also be used, and two pumps can be used to feed the dissolution device at the same time; domestic pumps of the same type can also be used.
(2)、套管预热器： 笫一， 内套管的管径 D325xl3, 当通过 525~ 550m3/h原矿浆时， 其矿浆流速为 2.08 ~2.18m/s， 根据流体力学原理 和本行业的经验， 当原矿浆在管内流速为 2.0~2.5m/s范围内时， 套管 预热器既可达到最佳的传热效果， 又不易在管内生成结疤。 第二， 传 热面积， 本套管预热器， 总传热面积 （以内管中径计算） 为 3174m2, 而原 450kt/年规模的套管预热器总传热面积为 2595m2， 增大 22.3 %， 故传热面积足够满足 500kt/年氧化铝规模的要求。 (2), casing preheater: 笫一, inner casing diameter D325xl3, when passing 525~ 550m 3 /h raw slurry, the slurry flow rate is 2.08 ~ 2.18m / s, according to the principles of fluid mechanics and Industry experience, when the original slurry in the tube flow rate is in the range of 2.0 ~ 2.5m / s, the casing preheater can achieve the best heat transfer effect, and it is not easy to generate scars in the pipe. Second, the heat transfer area, the jacket preheater, the total heat transfer area (calculated as the inner diameter of the inner tube) is 3174 m 2 , and the total heat transfer area of the original 450 kt / year casing preheater is 2595 m 2 , increasing The size is 22.3%, so the heat transfer area is sufficient to meet the 500kt/year alumina scale.
(3) 、 脉冲緩冲器： 容积增加 17.3%, 可满足 500kt/年氧化铝生 产要求。  (3), pulse buffer: The volume increased by 17.3%, which can meet the 500kt/year alumina production requirements.
(4) 、 压煮器： 第一， 本圧煮器容积 100m3/台， 现有压煮器容 积 8：3 m3/台， 每台容积增加 20.5%。 第二， 带加热管的压煮器传热面 积， 现有压煮器传热面积为 540m2, 本压煮器传热面积为 610m2， 增加 13.0%, 压煮器容积和传热面积均可满足 500kt/年氧化铝生产要求。 (4), cooker: First, the volume of the cooker is 100m 3 /set, the volume of the existing cooker is 8:3 m 3 /set, each volume increases by 20.5%. Second, the heat transfer area of the cooker with heating tube, the heat transfer area of the existing cooker is 540m 2 , the heat transfer area of the cooker is 610m 2 , an increase of 13.0%, the volume of the cooker and the heat transfer area are both Can meet the 500kt / year alumina production requirements.
(6) 、 闪蒸器： 本溶出装置共设 12台闪蒸器， 现有 450kt/年规模 的溶出装置， 其闪蒸器规格为（|)3.0~5.0 9.7111， 本溶出装置的闪蒸 器将其调整为 Φ 3.5 ~ 5.5 9.7m, 各台闪蒸器截面积分别增加 21.0 - 36.1%, 可满足 500kt/年氧化铝生产要求。  (6) Flash evaporator: There are 12 flash evaporators in this dissolution apparatus. The existing 450kt/year dissolution apparatus has a flasher size of (|) 3.0~5.0 9.7111. The flasher of this dissolution apparatus adjusts it to Φ 3.5 ~ 5.5 9.7m, the cross-sectional area of each flasher increased by 21.0 - 36.1%, which can meet the 500kt / year alumina production requirements.
经对本发明的新型溶出装置各主要设备进行产能复核， 其氧化铝 产能完全能满足 500kt/年的需要。  The main equipment of the novel dissolution apparatus of the present invention is subjected to capacity review, and its alumina production capacity can fully meet the needs of 500 kt/year.
工作时， 从原料磨或常压脱硅工序来的原矿浆进高压隔膜泵， 通 过高压隔膜泵将原矿浆送到第一个脉冲緩冲器， 然后进 5 ~ 6级套管预 热器， 原矿浆经第二个脉冲緩冲器后进入 4 ~ 5级预热压煮器， 将原矿 浆温度预热到 200Ό左右， 再进反应压煮器中用新蒸汽加热， 温度提 高到 255 ~ 262 Ό正常溶出温度的要求， 随后进行保温溶出停留时间约 30 ~ 60min , 溶出后矿浆进矿浆自蒸发器， 经十级闪蒸降温降压， 温 度从 255 ~ 260 "C降为 127 ~ 135 Ό , 然后送稀释槽， 与沉降车间来的赤 泥洗液汇合后送溶出后槽， 稀释料浆在溶出后槽停留约 4小时以脱除 溶液中的硅、 铁等杂质， 然后送往沉降车间。 During operation, the raw slurry from the raw material mill or atmospheric desiliconization process is pumped into the high pressure diaphragm pump, and the raw slurry is sent to the first pulse buffer through the high pressure diaphragm pump, and then into the 5-6 stage casing preheater. After the second pulse buffer, the original slurry enters the 4~5 preheating cooker, preheating the original slurry temperature to about 200 ,, and then heating it into the reaction digester with new steam, and the temperature is raised to 255~ 262 Ό normal dissolution temperature requirements, followed by thermal insulation dissolution residence time 30 ~ 60min, after the dissolution, the slurry enters the slurry from the evaporator, and the temperature is reduced from 255 ~ 260 "C to 127 ~ 135 经, and then the temperature is from 255 ~ 260 "C to 127 ~ 135 Ό, and then sent to the dilution tank, and the red mud washing liquid from the sedimentation workshop. After the confluence, the post-dissolution trough is sent, and the diluted slurry is left in the trough after the dissolution for about 4 hours to remove impurities such as silicon and iron in the solution, and then sent to the sedimentation workshop.
本溶出装置各设备连接方式为： 高压隔膜泵与第一个脉冲緩冲器 (压力 7.0Mpa )连接， 第一个脉冲緩冲器与套管预热器连接， 套管预 热器与第二个脉冲緩冲器 （压力 5.2Mpa )连接， 第二个脉冲緩冲器与 一组带加热管束压煮器连接， 带加热管束压煮器与压煮器连接， 压煮 器与一组闪蒸器， 闪蒸器出料口与稀释槽连接。 具体连接流程可参见 本专利附的流程图。 The connection mode of each device of the dissolution device is: The high pressure diaphragm pump is connected with the first pulse buffer (pressure 7.0Mpa), the first pulse buffer is connected with the casing preheater, the casing preheater and the second buffers pulse (pressure 5 .2Mpa) is connected, and a second set of buffers pulse tube bundle with a heating boiler pressure connection, with a tube bundle heat Autoclave Autoclave connected with, autoclaving with a set of flash The steamer and the flasher outlet are connected to the dilution tank. For the specific connection process, refer to the flowchart attached to this patent.
本发明的有益效果是： 将现有每组溶出装置 450kt/年氧化铝生产 规模提高到 500kt/年以上， 使我国氧化铝工业在设备大型化方面又向 前迈出一大步， 进一步提高我国氧化铝技术装备水平。  The invention has the beneficial effects of: increasing the 450kt/year alumina production scale of each existing dissolution device to 500kt/year or more, which makes the alumina industry of China take a big step forward in the large-scale equipment, further improving China Alumina technical equipment level.
附图说明：  BRIEF DESCRIPTION OF THE DRAWINGS:
图 1为本发明的工艺流程示意图。  Figure 1 is a schematic view of the process flow of the present invention.
具体实施方式：  detailed description:
本发明的实施例： 按照氧化铝产能为 500kt/年选择以下设备进行 配套：  Embodiments of the invention: The following equipment is selected according to the alumina capacity of 500 kt/year:
①溶出进料泵：选用高压隔膜泵 2台， 流量 Q=550m3/h， P=6.0 - 7.0 Mpa; 也可采用流量为 250 ~ 300m3/h， Ρ=6·0 ~ 7.0 Mpa的隔膜泵 3台。 1 Dissolution feed pump: 2 high-pressure diaphragm pumps are used, flow rate Q=550m 3 /h, P=6.0 - 7.0 Mpa; diaphragm with flow rate of 250 ~ 300m 3 /h, Ρ=6·0 ~ 7.0 Mpa 3 pumps.
②套管预热器：采用六级套管预热，每级六根，每根套管长度 90m， 套管总长度 3240m; 内套管规格为： D325 x l3 ~ 14、 外套管规格为： D402 9 ~ 10;  2 casing preheater: preheating with six-stage casing, six per stage, each casing length is 90m, the total length of casing is 3240m; inner casing specification is: D325 x l3 ~ 14, outer casing specification is: D402 9 ~ 10;
③脉冲緩冲器： 2台， 压力分别为 5.2Mpa和 7.0Mpa， 设备规格： φ 2.6 10m, 容积 42m3; 3 pulse buffer: 2 sets, the pressure is 5.2Mpa and 7.0Mpa respectively, equipment specifications: φ 2.6 10m, volume 42m 3 ;
④带加热管束压煮器： 16台， 设计压力 5.2Mpa， 压煮器规格： φ 3 X 18m, 容积 100m3， 加热面积 610m2; 4 with heating tube bundle cooker: 16 sets, design pressure 5.2Mpa, pressure cooker specifications: φ 3 X 18m, volume 100m 3 , heating area 610m 2 ;
⑤压煮器： 5台， 设计压力 5.2Mpa， 圧煮器规格： φ 3 χ 18ιη， 容 积 100m3; 5 pressure cooker: 5 sets, design pressure 5.2Mpa, cooker specifications: φ 3 χ 18ιη, volume 100m 3 ;
⑥闪蒸器： 共 12台，  6 flashers: a total of 12 sets,
12 #、 11 #闪蒸器规格： φ 3.5 9.7m, 压力 3.2Mpa;  12 #, 11 #flasher specifications: φ 3.5 9.7m, pressure 3.2Mpa;
10 #、 9 #闪蒸器规格： φ 3.5 X 9.7m, 压力 2.8Mpa; 8 #闪蒸器规格 Φ3.5 X 9.7m 压力 2.4Mpa 10 #, 9 #Flasher specifications: φ 3.5 X 9.7m, pressure 2.8Mpa; 8 #Flasher specification Φ3.5 X 9.7m Pressure 2.4Mpa
7 #闪蒸器规格 Φ4.5 X 9.7m 压力 2.0Mpa  7 #Flasher Specifications Φ4.5 X 9.7m Pressure 2.0Mpa
6 #闪蒸器规格 Φ4.5 X 9.7m 压力 1.6Mpa  6 #Flasher Specifications Φ4.5 X 9.7m Pressure 1.6Mpa
5 #闪蒸器规格 Φ4.5 X 9.7m 压力 1.3Mpa  5 #Flasher Specifications Φ4.5 X 9.7m Pressure 1.3Mpa
4 #闪蒸器规格 Φ4.5 X 9.7m 压力 l.OMpa  4 #Flasher Specifications Φ4.5 X 9.7m Pressure l.OMpa
3 #闪蒸器规格 Φ5.5 X 9.7m 压力 0.8Mpa  3 #Flasher Specifications Φ5.5 X 9.7m Pressure 0.8Mpa
2#、 1#闪蒸器规格 φ 5.5 X 9.7m 压力 0.6Mpa  2#, 1# flasher specifications φ 5.5 X 9.7m pressure 0.6Mpa
以上设备用管道按照溶出工艺流程顺序依次连接， 组成溶出工序 的完整流程。  The above equipment is connected in series according to the dissolution process sequence to form a complete process of the dissolution process.
新溶出装置主要技术指标为， 循环母液： Na20K 235~245g/l, RP 0.53 - 0.55; 原矿浆温度： 90Ό; 溶出温度： 258 ~ 262 Ό; 溶出 时间： 40min; 氧化铝溶出率： 93%~95%； 溶出液 RP: 1.18 ~ 1.20; 溶出赤泥碱比： 0.28 - 0.38; The main technical indicators of the new dissolution apparatus are: circulating mother liquor: Na 2 0 K 235~245g/l, R P 0.53 - 0.55; raw pulp temperature: 90Ό; dissolution temperature: 258 ~ 262 Ό; dissolution time: 40min; alumina dissolution rate : 93%~95%; eluent R P : 1.18 ~ 1.20; dissolution ratio of red mud to alkali: 0.28 - 0.38;
末级自蒸发温度： 130~i:32°C; 溶出装置运转率： 93%~96%； 稀 释液溶出后槽停留时间： 4h。 The final stage self-evaporation temperature: 130~i: 32°C; the dissolution rate of the dissolution device: 93 %~ 9 6%; the residence time of the solution after the dissolution of the diluent: 4h.

Claims

权 利 要 求 Rights request
1. 一种氧化铝溶出装置， 其特征在于： 它包括以下设备：An alumina dissolution apparatus characterized in that it comprises the following equipment:
①溶出进料泵： 选用高压隔膜泵 2台， 流量 Q=480 ~ 550m3/h， P=6.0~7.0 Mpa; 或选择高压隔膜泵 3台， 流量 Q=250 ~ 300m3/h， P=6.0 - 7.0 Mpa。 1 Dissolution feed pump: 2 high pressure diaphragm pumps are used, flow rate Q=480 ~ 55 0m 3 /h, P=6.0~7.0 Mpa; or 3 high pressure diaphragm pumps, flow rate Q=250 ~ 300m 3 /h, P =6.0 - 7.0 Mpa.
②套管预热器： 采用六级套管预热， 内套管规格为0；325 ><13~14， 外套管规格为 D402 X 9 ~ 10; 2 casing preheater: preheating with six-stage casing, inner casing specification is 0; 32 5 ><1 3 ~14, outer casing specification is D402 X 9 ~ 10;
③脉冲緩冲器： 2台， 压力分别为 5.2Mpa和 7.0Mpa, 设备规格 φ 2.6 10m; ③ Pulse Buffer: 2, and pressures of 5.2Mpa 7 .0Mpa, equipment specifications φ 2.6 10m;
④带加热管束压煮器： 15或 16台， 设计压力 5.2Mpa， 压煮器规格 φ 3 X 18m;  4 with heating tube bundle cooker: 15 or 16 units, design pressure 5.2Mpa, pressure cooker specifications φ 3 X 18m;
⑤压煮器： 4或 5台， 设计压力 5.2Mpa， 压煮器规格 φ 3 χ 18m; 5 pressure cooker: 4 or 5 sets, design pressure 5.2Mpa, pressure cooker specifications φ 3 χ 18m;
⑥闪蒸器： 共 12台， 规格如下： 6 flashers: a total of 12 units, the specifications are as follows:
12 #、 11 #闪蒸器规格: Φ3.5 X 9.7m, 压力 3.2Mpa  12 #, 11 #flasher specifications: Φ3.5 X 9.7m, pressure 3.2Mpa
10#、 9#闪蒸器规格： Φ3.5 X 9.7m, 压力 2.8Mpa  10#, 9# flasher specifications: Φ3.5 X 9.7m, pressure 2.8Mpa
8 #闪蒸器规格 Φ3.5 X 9.7m, 压力 2.4Mpa  8 #Flasher Specifications Φ3.5 X 9.7m, Pressure 2.4Mpa
7 #闪蒸器规格 Φ4.5 X 9.7m, 压力 2.0Mpa  7 #Flasher Specifications Φ4.5 X 9.7m, Pressure 2.0Mpa
6 #闪蒸器规格 Φ4.5 X 9.7m， 压力 1.6Mpa  6 #Flasher specification Φ4.5 X 9.7m, pressure 1.6Mpa
5 #闪蒸器规格 Φ4.5 X 9.7m, 压力 1.3Mpa  5 #Flasher Specifications Φ4.5 X 9.7m, Pressure 1.3Mpa
4 #闪蒸器规格 Φ4.5 X 9.7m， 压力 l.OMpa  4 #Flasher Specifications Φ4.5 X 9.7m, Pressure l.OMpa
3 #闪蒸器规格 Φ5.5 X 9.7m， 压力 0.8Mpa  3 #Flasher Specifications Φ5.5 X 9.7m, pressure 0.8Mpa
2#、 1#闪蒸器规格： Φ5.5 X 9.7m， 压力 0.6Mpa 以上设备用管道按溶出工艺流程顺序如下依次连接： 高压隔膜泵 与第一个脉冲緩冲器 （压力 7.0Mpa)连接， 第一个脉冲緩冲器与套管 预热器连接， 套管预热器与第二个脉冲緩冲器 （压力 5.2Mpa) 连接， 第二个脉冲緩冲器与一组带加热管束压煮器连接， 带加热管束压煮器 与压煮器连接， 压煮器与一组闪蒸器， 闪蒸器出料口与稀释槽连接。  2#, 1# flasher specifications: Φ5.5 X 9.7m, pressure 0.6Mpa or more The equipment pipelines are connected in the following order according to the dissolution process sequence: The high pressure diaphragm pump is connected with the first pulse buffer (pressure 7.0Mpa). The first pulse buffer is connected to the casing preheater, the casing preheater is connected to the second pulse buffer (pressure 5.2 MPa), and the second pulse buffer is combined with a group of heating tube bundles. Connected, with a heating tube bundle cooker connected to the cooker, the cooker is connected to a set of flashers, and the flasher discharge port is connected to the dilution tank.
2. 根据权利要求 1所述的氧化铝溶出装置， 其特征在于： 它的主 要技术指标为， 循环母液： Na20K 230~250g/l, RP 0.53 - 0.60; 原矿浆温度： 85-96Ό;溶出温度： 255 ~ 262 溶出时间： 30 ~ 60min; 氧化铝溶出率： >93%；溶出液 RP: 1.15 ~ 1.20;溶出赤泥碱比： 0.28~ 2. The alumina dissolution apparatus according to claim 1, wherein: the main technical index is: circulating mother liquor: Na 2 0 K 230-250 g/l, R P 0.53 - 0.60; raw pulp temperature: 85- 96Ό; dissolution temperature: 255 ~ 262 dissolution time: 30 ~ 60min; alumina dissolution rate: >93%; eluent R P : 1.15 ~ 1.20; dissolution red mud alkali ratio: 0. 28 ~
0.40; 末级自蒸发温度： 127~135°C; 溶出装置运转率： 稀 释液溶出后槽停留时间： 3.5~4.5h。 0.40; The final stage self-evaporation temperature: 127~135°C; The dissolution rate of the dissolution device: The residence time of the solution after the dissolution of the diluent: 3.5~4.5h.
3. 根据权利要求 1或 2所述的氧化铝溶出装置， 其特征在于： 它 的主要技术指标为，循环母液： Na20K 235 - 245g/l, RP 0.53 - 0.55; 原矿浆温度： 90C; 溶出温度： 258 ~ 262 "C; 溶出时间： 40min; 氧 化铝溶出率： 93%~95%； 溶出液 RP: 1.18-1.20; 溶出赤泥碱比： 0.28-0.38; 末级自蒸发温度： 130~132*C; 溶出装置运转率： 93% ~ 96%; 稀释液溶出后槽停留时间： 4h。 The alumina dissolution apparatus according to claim 1 or 2, characterized in that: the main technical index is: circulating mother liquor: Na 2 0 K 235 - 245 g / l, R P 0.53 - 0.55; raw pulp temperature: 90C; Dissolution temperature: 258 ~ 262 "C; Dissolution time: 40min; Alumina dissolution rate: 93%~95%; Eluent R P : 1.18-1.20; Dissolution red mud-base ratio: 0.28-0.38; Temperature: 130~132*C; Dissolution device operating rate: 93% ~ 96%; Tank residence time after dilution solution: 4h.
PCT/CN2006/002701 2005-10-19 2006-10-13 Alumina digesting apparatus WO2007045154A1 (en)

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