WO2007009378A1 - Procede de dissolution de gibbsite a forte teneur en fer - Google Patents

Procede de dissolution de gibbsite a forte teneur en fer Download PDF

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Publication number
WO2007009378A1
WO2007009378A1 PCT/CN2006/001744 CN2006001744W WO2007009378A1 WO 2007009378 A1 WO2007009378 A1 WO 2007009378A1 CN 2006001744 W CN2006001744 W CN 2006001744W WO 2007009378 A1 WO2007009378 A1 WO 2007009378A1
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Prior art keywords
dissolution
pressure
dissolving
temperature
gibbsite
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PCT/CN2006/001744
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English (en)
French (fr)
Inventor
De Chen
Shutao Xu
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China Aluminum International Engineering Corporation Limited
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Publication date
Application filed by China Aluminum International Engineering Corporation Limited filed Critical China Aluminum International Engineering Corporation Limited
Publication of WO2007009378A1 publication Critical patent/WO2007009378A1/zh

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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
    • C01F7/06—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

Definitions

  • the present invention relates to an alumina production process for the dissolution process of high-iron trihydrate bauxite.
  • China's alumina plants mainly use diaspore as raw materials, and some alumina plants also use foreign trihydrate bauxite as raw materials.
  • the dissolution performance is quite different. In general, the dissolution performance of the gibbsite is better than that of diaspore.
  • the dissolution conditions of the use of diaspore in domestic alumina plants are generally "three highs", that is, high temperature, high pressure and high alkali concentration.
  • the specific dissolution conditions are: circulating mother liquor alkali concentration
  • the dissolution conditions using imported gibbsite are generally "three,,, ie, medium temperature, medium pressure, medium alkali concentration, the specific dissolution conditions are: circulating mother liquor alkali concentration Na 2 O K 170 ⁇ 190g / l, temperature 142 ⁇ 145 inches, pressure: ⁇ 0.6Mpa.
  • Guangxi High-speed Railway Sanshui Bauxite Mine is a new type of mineral resource discovered in China. It is different from the diaspore and imported gibbsite used in the alumina plant. It is characterized by: Ore and oxidation in the ore. Iron has two useful minerals, and the iron oxide content in the ore is greater than the alumina content. It is necessary to consider the simultaneous recovery of iron and aluminum in order to have economic benefits when formulating technical solutions. Other countries such as Vietnam also have similar high-speed rail trihydrate bauxite mines.
  • the object of the invention is: aiming at the characteristics of high-iron trihydrate bauxite ore, a new low-temperature, normal-pressure and low-alkali concentration dissolution technology of bauxite is proposed, which can meet the requirements of high-iron trihydrate bauxite dissolution and greatly save engineering. Investment, saving steam consumption.
  • the present invention is achieved by: taking low temperature, normal pressure, low alkali concentration dissolution, dissolution
  • the artistic conditions are as follows: the alkali concentration of the circulating mother liquor is Na 2 O K 140 ⁇ 150g/l, the dissolution temperature is 105 ⁇ 108 ⁇ , the dissolution pressure is normal pressure, the dissolution time is 10 ⁇ 15min, and the fineness of the raw slurry into the dissolution passes through the 20 mesh sieve, heating steam The pressure is 0.6Mpa.
  • the dissolution technique of the present invention is much simpler than the existing high temperature or high temperature medium pressure dissolution technique of the alumina plant, and the dissolution process can be completed in a conventional mechanical agitation tank without the pressure vessel, the steam pressure used. It is also low, so the investment in the dissolution device is very low, and the investment in the boiler room is also small. It is not necessary to build a high-pressure boiler, and only a low-pressure boiler with a pressure of 1.2 MPa can be built.
  • the dissolution results achieved by the bauxite are:
  • a solution of silicon volume index 40 ⁇ 60.
  • the dissolution temperature is only 105 to 108 ⁇ , and the dissolution temperature of the existing alumina plant in the country is 142 to 280 ° C, the temperature rise of the raw ore slurry to be heated is low, so the heat consumption of the dissolution is also low.
  • the elution solution obtained by the present dissolution technique has a silicon content index of only 40 to 60. This solution should be added with a desiliconization step in the subsequent sedimentation process, so that the amount of semen silicon to be decomposed is between 180 and 250.
  • the beneficial effects of the invention are as follows: It can meet the dissolution requirements of the domestic high-speed iron trihydrate bauxite mine, greatly save engineering investment and save steam consumption.
  • the raw ore slurry from the raw material grinding step is directly sent to the mechanical stirring dissolution tank in the dissolution step, and is subjected to atmospheric pressure dissolution.
  • the dissolution conditions are as follows: the circulating mother liquor alkali concentration Na 2 O K 140 to 150 g/l
  • the dissolution temperature is 105 ⁇ 108 °C
  • the dissolution pressure is normal pressure
  • the dissolution time is 10 ⁇ 15min
  • the fineness of the raw slurry to be dissolved is required to pass 100% through 20 mesh sieve
  • the heating steam pressure is 0.6Mpa.
  • the original slurry can be heated by a casing preheater or by heating pipes provided in the dissolution agitation tank. After the dissolution, the slurry is pumped to the red mud classification process.
  • Embodiment 2 of the present invention The dissolution condition of the embodiment 1 is used, and the mechanical agitation tank is replaced by an insulated pipe.
  • the length of the pipe is determined by the residence time of the original slurry for 10 to 15 minutes, and the same dissolution effect can be achieved.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Nutrition Science (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Inorganic Chemistry (AREA)
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Description

高铁三水铝土矿溶出技术 技术领域：
本发明涉及一种氧化铝生产工艺， 用于高铁三水铝土矿的溶出工 序。
背景技术-.
我国氧化铝厂主要以一水硬铝石为原料，有些氧化铝厂也使用国外 三水铝土矿为原料。 在生产过程中， 由于矿石类型不同，溶出性能差别 较大，总体来说， 三水铝土矿溶出性能优于一水硬铝石。
国内氧化铝厂使用一水硬铝石的溶出条件总体来说是 "三高" ， 即为高温、 高压、 高碱浓度， 具体溶出条件为： 循环母液碱浓度
Na2OK210 ~ 250g/l, 温度 260 ~ 280°C , 压力： 40 ~ 70Mpa。
使用进口三水铝石的溶出条件总体来说是 "三中，， ， 即为中温、 中压、 中等碱浓度， 具体溶出条件为： 循环母液碱浓度 Na2OK170 ~ 190g/l, 温度 142 ~ 145Ό， 压力： ~ 0.6Mpa。
广西高铁三水铝土矿是我国发现的一种新型矿产资源,与目前氧化 铝厂使用的一水硬铝石和进口的三水铝石不一样，其特点是： 矿石中同 时含氧化铝和氧化铁两种有用矿物，且矿石中氧化铁含量大于氧化铝含 量， 在制定技术方案时需考虑铁和铝同时回收才有经济效益。 越南等 其他国家也有类似的高铁三水铝土矿。
经试验发现，由于矿物中部分铝是以铝针铁矿的形式存在的,加之 铁对铝包裹严重，现有的溶出条件不能将这部分矿石中氧化铝溶出来， 提高温度和压力只能是白白消耗蒸汽和投资，反而使矿石中的硅矿物参 与化学反应，降低氧化铝溶出率和造成碱耗增加。
通过多年的研究发现，矿石中的三水铝也是能够溶出的，在低温、 低碱、 常压条件下，矿石中的氧化铝溶出率可达 58 ~ 60%; 但是， 提高 溶出温度和压力，对氧化铝溶出率没有效果。
发明内容：
本发明的目的在于： 针对高铁三水铝土矿的特点， 提出一种新的 铝土矿低温、 常压、 低碱浓度溶出技术，能够满足高铁三水铝土矿溶出 要求，大幅度节约工程投资， 节约蒸汽消耗。
本发明是这样实现的： 采取低温、 常压、 低碱浓度溶出， 溶出工 艺条件为： 循环母液碱浓度 Na2OK140~ 150g/l， 溶出温度 105 ~ 108Ό， 溶出压力为常压， 溶出时间 10~ 15min， 进溶出的原矿浆细度通过 20 目筛， 加热蒸汽压力 0.6Mpa。
采用本发明的溶出技术， 与氧化铝厂现有的高温高压或中温中压 溶出技术相比要简单得多， 可在常规的机械搅拌槽中完成溶出过程， 不需要压力容器， 所用的蒸汽压力也较低， 所以说溶出装置的投资很 低， 锅炉房的投资也较少， 不需要建高压锅炉， 只建压力为 1.2Mpa的 低压锅炉即可。
采用本发明， 铝土矿达到的溶出结果为：
—矿石中氧化铝溶出率： 58~60%
一溶出液 ctK: 1.80 ~ 1.82。
一溶出液硅量指数： 40~60。
—溶出赤泥中含碱 Na20: 1.8%。
由于本溶出温度仅 105 ~ 108 Ό， 而国内现有氧化铝厂的溶出温度 为 142~ 280°C， 原矿浆需要加温的温升低， 因而溶出的热耗也很低。
采用本溶出技术得到的溶出液， 硅量指数仅 40~60， 此溶液应在 后序的沉降工序增设脱硅工序， 使送去分解的精液硅量指数达到 180 - 250之间。
本发明的有益效果是： 能够满足国产高铁三水铝土矿溶出要求,大 幅度节约工程投资， 节约蒸汽消耗。
具体实施方式：
本发明的实施例 1: 从原料磨工序来的原矿浆， 直接送到溶出工 序的机械搅拌溶出槽中， 进行常压溶出， 溶出条件为： 循环母液碱浓 度 Na2OK140~ 150g/l, 溶出温度 105 ~ 108°C， 溶出压力为常压， 溶出 时间 10~ 15min， 进溶出的原矿浆细度要求 100%通过 20目筛， 加热蒸 汽压力 0.6Mpa。
原矿浆可以采用套管预热器加热， 也可以采用在溶出搅拌槽内设 置加热管道的方式加热， 溶出后料浆用泵送往赤泥分级工序。
本发明的实施例 2: 采用实施例 1 的溶出条件， 用保温管道取代 机械搅拌槽， 管道长度按原矿浆停留 10~ 15min时间确定， 也可达到 同样的溶出效果。

Claims

权 利 要 求 一种高铁三水铝土矿溶出技术， 其特征在于： 采取低温、 常压、 低碱浓度溶出， 溶出工艺条件为： 循环母液碱浓度 Na2OK140~150g/l, 溶出温度 105~108Ό， 溶出压力为常压， 溶出时间 10~15min, 进溶 出的原矿浆细度通过 20目筛， 加热蒸汽压力 0.6Mpa。
PCT/CN2006/001744 2005-07-18 2006-07-18 Procede de dissolution de gibbsite a forte teneur en fer WO2007009378A1 (fr)

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CN200510200399.9A CN1730393A (zh) 2005-07-18 2005-07-18 高铁三水铝土矿溶出技术
CN200510200399.9 2005-07-18

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116002730A (zh) * 2022-12-27 2023-04-25 广西大学 一种高铁三水铝石矿的溶出方法
CN116354372A (zh) * 2022-12-27 2023-06-30 广西大学 一种高铁三水铝石矿中铁铝的分离方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4650653A (en) * 1985-04-30 1987-03-17 Aluminium Pechiney Production of alumina from gibbsite-bearing bauxite of low reactive silica content
US5653947A (en) * 1995-03-31 1997-08-05 Aluminium Pechiney Method of treating alumina trihydrate containing bauxite of low reactive silica content to form supersaturated sodium aluminate liquor
CN1597524A (zh) * 2004-07-23 2005-03-23 山东铝业股份有限公司 铝土矿低温连续溶出工艺

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4650653A (en) * 1985-04-30 1987-03-17 Aluminium Pechiney Production of alumina from gibbsite-bearing bauxite of low reactive silica content
US5653947A (en) * 1995-03-31 1997-08-05 Aluminium Pechiney Method of treating alumina trihydrate containing bauxite of low reactive silica content to form supersaturated sodium aluminate liquor
CN1597524A (zh) * 2004-07-23 2005-03-23 山东铝业股份有限公司 铝土矿低温连续溶出工艺

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116002730A (zh) * 2022-12-27 2023-04-25 广西大学 一种高铁三水铝石矿的溶出方法
CN116354372A (zh) * 2022-12-27 2023-06-30 广西大学 一种高铁三水铝石矿中铁铝的分离方法

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