Reaction was carried out within 1h, modified molecular sieve waste Ca2 + absorption rate faster, significantly increased adsorption capacity and adsorption rate is high concentrations faster than a low concentration. With the increase of contact time, Yuyao molecular sieve adsorption rate decreased rapidly, the reaction for 2h, molecular sieves, two different initial concentrations in water samples Ca2 + absorption reached saturation, respectively 12.2mg / g and 17.8mg / g. The initial reaction, adsorption mainly in the outer surface of the adsorbent and some micropores, can be completed within a short time, the repulsive force increases as the amount of adsorption generated Ca2 + enhanced pore free metal ions further enhance internal resistance, After 2h reaction, adsorption balance. It can be seen, Yuhang molecular sieves, this modified molecular sieve adsorption saturation waste time 2h. According to the practical application of reverse osmosis water out of Ca2 + concentration, select Ca2 + concentrations were 50mg / L and 200mg / L of water two samples to inspect its adsorption conditions. 2.2.2 adsorption time of removal of Ca2 + were taken Ca2 + concentration of 50mg / L and 200mg / 100mL L solution in stoppered Erlenmeyer flask, Waste Molecular 1.0g / L was added into the modified constant shaking bed in shock, Fenghua molecular sieve shaker set temperature is 20 ℃, were investigated at different adsorption time on the adsorption of Ca2 +, the experimental results shown in Figure 1. Zeolite | new molecular sieve | molecular sieve by the Shanghai Fenghua new molecular sieve Limited. Zeolite | new molecular sieve | molecular sieve is Shanghai Fenghua new molecular sieve Limited (www.molsionms.com) this year introduced a new upgrade, the above picture is for reference only, please call Tel picture on this page or to obtain the latest information Contact: Mr. Pan.