The Sepiolite Purify Fumes From Its Activation Of The Comprehensive Utilization Of Waste Acid Of Research

Cooking fume is one of important pollutant sources in affecting urban air quality. It does harm to people and appearance of city. The aim of the paper is to produce a kind of effective and economical adsorbent for removing cooking fume and to pave a new way for the development and utilization of sepiolite ore.Sepiolite is a kind of magnesium and silicate clay mineral with abundant water. It has big surface area and strong adsorption on oil. However, the purity of original sepiolite is low, it can't be used directly. The paper introduced a new process flow "disperse, purification, activition and shaped" which could make sepiolite grain adsorbent from original ore; Furthermore, the key process "purification and activition" were studied during the experiments. The results of research showed that purity of sepiolite could add from 27.1% to 74.4% after it had been dispersed and puritified; We achived the better process conditions of acid activation by orthogonal experiment. Sulfuric concentration was 4%; Activition time was 8h; Ratio of liquid and solid was 10:1(ml/g). The surface area of sepiolite could add more than twice on better process conditions.The key influence factors on adsorption of cooking fume were determined. The experiments on adsorption of cooking fume by sepiolite grain adsorbent were also done. In the experiments, we made researchs on the impacts of entrance concentration of oil fume, gas speed, height of adsorption layer and granularity of adsorbent on adsorption efficency and resistance. The breakthrough curve was achived and experiments on regeneration and contrast were done. Experimental results proved that cleaning efficency of oil fume dropped when gas speed of oil fume and partical size of adsorbent augmented, while cleaning efficency of oil fume increased when height of adsorption bed arised. When inlet concentration of oil fume was 100-150mg/L, gas speed of oil fume was 0.3~0.4m/s, partical sizes of adsorbent was 0.6-1.5mm and 1.5-2.8mm, height of adsorbent bed was 6cm, the removal efficency of oil fume could amount to 85-90% and 75-80%, system resistances were totally below 350Pa, when removal efficency of oil fume reached 30%, time of breakthrough of sepiolite adsorbent(partical size: 1.5-2.8mm) was 50h, average removal efficency was around 70% within first 20h, one gram sepiolite adsorbent could hold 0.415g oil fume.Regeneration of sepiolite could be done by heating and reducing pressure. When temperature reached 420 , the ratio of desorption of oil fume could attain around 90%. In the experiment, we made out a kind of new agent of composite flocculate from waste water which was produced in the cource of activition of sepiolite. It had good effect in treating printing and dyeing waste water.According to the results of experiments and considering actual production, the paper introduced application method on sepiolite grain adsorbent in industry and analysis of economic and benefit was also finished. We conclude that sepiolite grain adsorbent is a kind of good adsorbent in treating cooking fume because its cost is low, its removing efficency on oil fume is high and even it can be utilized repeatly.