Application of activated aluminum oxide defluorination adsorbing material with different surface features
A technology of surface characteristics and adsorption materials, which is applied in the direction of adsorption of water/sewage treatment, other chemical processes, and purification of combustible gases. It can solve the problems of difference in fluoride ion adsorption effect, large reactor, and decrease in adsorption capacity, so as to improve the removal of fluoride. The effect of adsorption capacity
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Embodiment 1~5
[0048] Fluorine (F - ) concentration, total dissolved solids (TDS), alkalinity, Cl - Concentration, hardness and other different water quality chemical characteristics, determined the specific process parameters for the preparation of active aluminum oxide fluorine removal adsorption materials with different surface characteristics, as shown in Table 1:
[0049] Table 1
[0050]
[0051] The preparation method of the active aluminum oxide fluorine removal adsorption material with different surface characteristics is as follows:
[0052] (1) The prepared concentration is 12Kg / m 3 Al 2 (SO 4 ) 3 Aqueous solution with a concentration of 0.5Kg / m 3 NaCl aqueous solution is mixed to obtain Al 2 (SO 4 ) 3 An aqueous solution mixed with NaCl (the molar ratio of aluminum to chlorine in the mixed aqueous solution is 8.2:1), and the concentration is 2.5Kg / m 3 NaOH aqueous solution; under the condition of full stirring, slowly add NaOH aqueous solution to Al 2 SO 4 Fully mi...
Embodiment 6
[0057] Fluorine (F - ) concentration is 1~2mg / L, total dissolved solids (TDS) is 450mg / L, Cl - The concentration is >250mg / L, the hardness is >450mg / L, according to the water quality conditions, the preparation conditions of active aluminum oxide fluorine removal adsorption materials with different surface characteristics are as follows:
[0058] (1) The preparation concentration is 15Kg / m 3 KOH aqueous solution; the prepared concentration is 1Kg / m 3 MgCl 2 Aqueous solution and 20Kg / m 3 AlCl 3 aqueous solution is mixed to obtain MgCl 2 and AlCl 3 Mixed aqueous solution (the molar ratio of aluminum to chlorine in the mixed aqueous solution is 0.32:1); under fully stirred conditions, slowly add KOH aqueous solution to MgCl 2 and AlCl 3 Fully mix in the mixed aqueous solution to obtain a reaction system, and slowly add the KOH aqueous solution to the MgCl 2 and AlCl 3 Monitor the pH value of the reaction system during the mixing of the mixed aqueous solution, when the e...
Embodiment 7
[0063] Fluorine (F - ) concentration is 2~3mg / L, total dissolved solids (TDS) is - The concentration is <100mg / L, and the hardness is <250mg / L. According to the water quality conditions, the preparation conditions of active aluminum oxide fluorine removal adsorption materials with different surface characteristics are as follows:
[0064] (1) The preparation concentration is 15Kg / m 3 KOH aqueous solution; the prepared concentration is 1Kg / m 3 MgCl 2 Aqueous solution and 20Kg / m 3 AlCl 3 aqueous solution is mixed to obtain MgCl 2 and AlCl 3 Mixed aqueous solution (the molar ratio of aluminum element to chlorine element in the mixed aqueous solution is 0.32:1); under the condition of full stirring, MgCl 2 and AlCl 3 The mixed aqueous solution is slowly added to the KOH aqueous solution and fully mixed to obtain a reaction system, and the MgCl 2 and AlCl 3 The mixed aqueous solution is slowly added to the KOH aqueous solution and the pH value of the reaction system is mon...
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