Filtering aid for filtering aluminate solution and using method thereof
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A filter aid and aluminate technology, which is applied to the filter aid for filtering aluminate solution and its application field, can solve the problems of alumina loss, influence production capacity, increase evaporation energy consumption, etc., and achieve the effect of good permeability
Inactive Publication Date: 2012-06-13
GUIZHOU BRANCH CHINA ALUMINUM IND
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[0003] In the alumina production process, milk of lime is generally used as a filter aid, because it can improve the filtration performance of crude liquid and improve the quality of Bayer semen, but thi
Method used
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[0012] Example 1
[0013] In the alumina production process, the crude liquid is filtered without adding filter aids. The filtration rate of 2 liters of crude liquid is 2 minutes and 43 seconds, and the semen float content is 0.032g / l, SiO 2 The content is 1.11 g / l, Fe 2 O 3 The amount is 0.014 g / l; fly ash and fly ash slag are added to the coarse liquid as filter aids, the filtration speed of 2 liters of coarse liquid is 2 minutes and 27 seconds, and the semen float content is 0.020g / l, SiO 2 The content is 1.14 g / l, Fe 2 O 3 The amount is 0.014 g / l.
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[0014] Example 2
[0015] In the process of alumina production, the crude liquid is added with lime milk to aid filtration. The filtration rate of 2 liters of crude liquid is 2 minutes and 13 seconds, and the semen floating matter content is 0.029g / l, SiO 2 The content is 1.06 g / l, Fe 2 O 3 The amount is 0.012 g / l; the coarse liquid is added with fly ash and fly ash slag to aid filtration, the filtration rate of 2 liters of coarse liquid is 2 minutes and 27 seconds, and the semen float content is 0.020g / l, SiO 2 The content is 1.14 g / l, Fe 2 O 3 The amount is 0.014 g / l.
Example Embodiment
[0016] Example 3
[0017] In the process of alumina production, the coarse liquid is added with fly ash slag and fly ash (adding ratios of 0.3, 0.5, 0.7 respectively) to aid filtration. The filter aid is fly ash and fly ash slag from thermal power plants, and its chemical composition Is SiO 2 45%, Fe 2 O 3 About 7%, Al 2 O 3 About 22%, CaO Combine About 9%, the particle size D50 is 12μm, the mixing ratio is 0.3. The filtration rate of 2 liters of crude liquid is 2 minutes 27 seconds, 2 minutes 54 seconds, 3 minutes 09 seconds, and the semen floating matter content is 0.020g / l, 0.022g / l, 0.031g / l, SiO 2 The content is 1.14 g / l, 1.12 g / l, 1.17 g / l, Fe 2 O 3 The amounts are 0.014 g / l, 0.014 g / l, 0.013 g / l.
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Abstract
A filtering aid for filtering an aluminate solution and a using method of the filtering aid relate to a method of using pulverized coal ash and pulverized coal ash residue to serve as the filtering aid. The filtering aid is characterized in that the filtering aid is pulverized coal ash and pulverized coal ash residue of thermal power plants. According to the method, the source of raw materials for the filtering aid is stable and reliable, the preparation method is simple, convenient and practical, and the used raw materials are industrial waste and are low in price and convenient to use. The pulverized coal ash and pulverized coal ash residue have adsorption and entrapment effects on solid impurities and particles suspended in liquid due to different particle sizes and porous characteristics, thereby the purpose of liquid and solid seperation is achieved. The pulverized coal ash and pulverized coal ash residue are used as the filtering aid so that the filtering aid does not cause the loss of an aluminum element in the leaf filtration process, also does not introduce other impurity elements to the leaf filtration process, can keep chemical compositions of an original solution in stability and constant to the maximum limit and is easy to popularize and apply in industry.
Description
technical field [0001] A filter aid for filtering aluminate solution and a method for using the same, relating to a method for using fly ash and fly ash slag as a filter aid to filter aluminate solution. Background technique [0002] Aluminum salt (aluminate) solution is the most basic raw solution for producing alumina and aluminum. The purity of this solution directly affects the chemical purity and product quality indicators of the obtained product. Therefore, the leaf filtration of the floating matter in the aluminum salt (aluminate) crude liquid is an important link in the alumina production process. The addition of filter aids uses its sieving and adsorption effects to trap solid impurity particles suspended in the liquid on the surface and voids of the filter medium, thereby achieving the purpose of solid-liquid separation. [0003] In the alumina production process, milk of lime is generally used as a filter aid, because it can improve the crude liquid filtration pe...
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