Filter aid for refined filtration of sodium aluminate solution and production and use method of filter aid

A production method, sodium aluminate technology, applied in chemical instruments and methods, separation methods, aluminate/alumina/aluminum hydroxide purification, etc., can solve the problems of consuming bauxite resources and lime resources, and achieve cost reduction Low cost, good performance, and the effect of reducing secondary pollution

Active Publication Date: 2017-05-31
湖南诺兰蒂尔环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Aiming at the defects in the prior art, the present invention provides a filter aid for the fine filtration of sodium aluminate solution and its production and use method, the purpose of which is to solve the need to consume bauxite resources and The problem of lime resources, and at the same time provide an effective way for the resource utilization of coal-fired power plants or sintering flue gas desulfurization by-products of sulfur-containing minerals, and reduce the problem of secondary pollution of desulfurization by-products. The filter aid of the present invention has more superior performance. lower cost

Method used

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  • Filter aid for refined filtration of sodium aluminate solution and production and use method of filter aid
  • Filter aid for refined filtration of sodium aluminate solution and production and use method of filter aid

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Embodiment 1

[0030] The filter aid used in the fine filtration of sodium aluminate solution in this embodiment is the α-phase calcium sulfate whisker, and the CaSO in the α-phase calcium sulfate whisker 4 Weight content ≥98%, whisker diameter 1-2μm, length 70-140μm, aspect ratio 70, D50 15μm, D90 / D10 2, water solubility at 22°C 3 , its microscopic image as figure 1 with figure 2 shown.

[0031] Its production method is carried out according to the following steps:

[0032] (1) by-products of flue gas desulfurization in coal-fired power plants, i.e. desulfurized gypsum, are uniformly mixed with water to make a slurry with a solid weight content of 2%;

[0033](2) at 80 DEG C, under the stirring condition of 100 revs / min, feed oxygen to the slurry of step (1), stop feeding oxygen after reacting for 30 minutes;

[0034] (3) The slurry after the reaction in the step (2) is sent into the autoclave, after adding the crystal form stabilizer magnesium chloride accounting for 0.2% of the slurr...

Embodiment 2

[0037] The filter aid used in the fine filtration of sodium aluminate solution in this embodiment is the α-phase calcium sulfate whisker, and the CaSO in the α-phase calcium sulfate whisker 4 Weight content ≥98%, average whisker diameter 2-4μm, length 100-150μm, average aspect ratio 60, D50 10μm, D90 / D10 3, water solubility at 22°C 3 .

[0038] Its production method is carried out according to the following steps:

[0039] (1) mixing the flue gas desulfurization by-product of sulfur mineral sintering, i.e. desulfurization gypsum, with water to make a slurry with a solid weight content of 5%;

[0040] (2) at 80 DEG C, under the stirring condition of 100 revs / min, feed oxygen to the slurry of step (1), stop feeding oxygen after reacting for 30 minutes;

[0041] (3) The slurry after the reaction in step (2) is sent into the autoclave, after adding the crystal form stabilizer EDTA accounting for 1% of the weight of the slurry after the reaction in the autoclave, at 120 ° C, the s...

Embodiment 3

[0044] The filter aid used in the fine filtration of sodium aluminate solution in this embodiment is the α-phase calcium sulfate whisker, and the CaSO in the α-phase calcium sulfate whisker 4 Weight content ≥98%, average diameter 0.2-2μm, length 30-150μm, average aspect ratio 70, D50 20μm, D90 / D10 2, water solubility at 22°C 3 .

[0045] Its production method is carried out according to the following steps:

[0046] (1) Mix the flue gas desulfurization by-product of sulfur-containing mineral sintering, that is, desulfurization gypsum and water evenly, and make a slurry with a solid weight content of 8%;

[0047] (2) at 80 DEG C, under the stirring condition of 100 revs / min, feed oxygen to the slurry of step (1), stop feeding oxygen after reacting for 30 minutes;

[0048] (3) the slurry after the reaction in the step (2) is sent into the autoclave, after adding the crystal form stabilizer sodium dodecylbenzenesulfonate accounting for 2% of the slurry weight after the reaction ...

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Abstract

The invention belongs to the technical field of production of aluminum oxide and particularly relates to a filter aid for refined filtration of a sodium aluminate solution and a production and use method of the filter aid. The filter aid for refined filtration of the sodium aluminate solution is alpha-phase calcium sulfate whisker, and the weight content of CaSO4 in the alpha-phase calcium sulfate whisker is greater than or equal to 98 percent. The preparation method comprises the following steps: oxidizing coal-fired power plant or sulfide-containing mineral sintering flue gas desulphurization byproduct, carrying out hydrothermal synthesis reaction and then calcining, wherein the average diameter of the whisker is 0.2 to 4mu m, and the average length-diameter ratio is 30 to 150. The particle size distribution and the dissolving property of the filter aid disclosed by the invention both can meet the requirements of serving as a sodium aluminate filter aid; moreover, the filter aid also has the advantages of good performance and low cost, and is suitable for popularization and application in the production process of the aluminum oxide.

Description

technical field [0001] The invention belongs to the technical field of alumina production, and in particular relates to a filter aid for fine filtration of sodium aluminate solution and a production and use method thereof. Background technique [0002] In most alumina refineries, a Kelly (kelly) leaf filter is used to fine-filter the sodium aluminate solution to separate the residual red mud in order to prevent the residual red mud from polluting the alumina product. The leaf filter is composed of a filter plate covered with a filter medium cloth. In the absence of filter aids, the filter media in leaf filters would quickly clog. This is because the fine red mud particles suspended in the sodium aluminate solution will be trapped in the channel of the filter medium, and then form a mud layer with high resistance on the surface of the leaf filter. In order to avoid this phenomenon, filter aids are usually added to the feed slurry of the leaf filter. Filter aids usually inc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/04B01J20/30B01D37/02C01F11/46
CPCB01D37/02B01J20/045C01F7/47C01F11/46C01F11/468
Inventor 罗春
Owner 湖南诺兰蒂尔环保科技有限公司
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