Method for reducing chlorine ion content in circulating water in chlor-alkali chemical industry
A technology of chlorine ion content and chlor-alkali chemical industry, which is applied in chemical instruments and methods, water pollutants, natural water treatment, etc., can solve problems such as lack of solutions, achieve good chlorine removal effect, simple operation, and small environmental pollution.
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Embodiment 1
[0020] First add a certain amount of calcium carbide slag to the supernatant of high chlorine circulating water, then add sodium hydroxide to aluminum hydroxide (molar ratio NaOH:Al(OH) 3 =1:1) in a supersaturated solution, stir until the aluminum hydroxide solid disappears, and then add this mixture to the high chlorine circulating water supernatant containing carbide slag in the chlor-alkali chemical industry, so that the Ca of the system 2+ 、Al 3+ , Cl - The molar ratio is 5:3:1. After stirring for 30 minutes and settling, the supernatant can be obtained as circulating water with reduced chloride ion content.
Embodiment 2
[0022] First add a certain amount of calcium carbide slag to the supernatant of high chlorine circulating water, then add sodium hydroxide to aluminum hydroxide (molar ratio NaOH:Al(OH) 3 =1:1) in a supersaturated solution, stir until the aluminum hydroxide solid disappears, and then add this mixture to the high chlorine circulating water supernatant containing carbide slag in the chlor-alkali chemical industry, so that Ca 2+ 、Al 3+ , Cl - The molar ratio is 5:2:1. After stirring for 40 minutes and settling, the supernatant can be obtained as circulating water with reduced chloride ion content.
Embodiment 3
[0024] First add a certain amount of calcium carbide slag to the supernatant of high chlorine circulating water, then add sodium hydroxide to aluminum hydroxide (molar ratio NaOH:Al(OH) 3 =1:1) in a supersaturated solution, stir until the aluminum hydroxide solid disappears, and then add this mixture to the high chlorine circulating water supernatant containing carbide slag in the chlor-alkali chemical industry, so that Ca 2+ 、Al 3+ , Cl - The molar ratio is 5:3:2. After stirring for 30 minutes, the supernatant can be obtained after settling, which is circulating water with reduced chloride ion content.
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