Adsorption ability of chromium in wastewater by purified diatomite as the adsorbent material was studied. The influence of the diatomite dosage, adsorption time, chromium concentration, pH value and reaction temperature to chromium removal rate was got. The results show that under the condition of the diatomite dosage of 9.0g, adsorption time of 90 min, chromium concentration in wastewater of 5mg/L, wastewater pH of 6, and temperature of 30°C, diatomite adsorption removal rate to hexavalent chromium can reach 91.6%. The main adsorption mechanism is the combination of physical adsorption and chemical adsorption, and the latter is dominant. The cost of diatomite as adsorbent is low, and a good removal rate of chromium can be reached, which provides a solid theoretical basis for the removal of chromium in wastewater.
Wet centrifugal separation process is used to purify diatomite by analyzing the properties of diatomite raw ore in Linjiang city, Jilin province. Experimental results determine the affecting sorting important indicators, including scrubbing agent and dosage, sieving mesh, centrifugal separation. The concentration of SiO2in the final diatomite is 86.76%, reaching primary soil standard. Compared with gravity sedimentation purification process, new technology method saves much time and achieves the ideal separation effect.
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