The Preparation Of The Xinjiang Coal-based Activated Carbon/Magnetic Activated Carbon And Adsorptivity Research

The coal resources are rich in xinjiang has already proven reserves of100,8billion tons, the vision ofreserves as high as2.19trillion tons, accounts for about40%of the national total reserves. Relying on theadvantage resources in xinjiang, coal produce electricity, coal producer gas, and coal produce oil projecthas been a succession of commencement or put into production. Activated carbons have high qualityadsorbent, the sources of the raw materials can be easily found. Using xinjiang coal as raw material topreparation high performance coal-based activated carbon can increase the utilization of coal and have theimportant meaning to developing economy.The coal have complicated composition and high ash content, Use physical method producecoal-based activated carbons hardly get high performance products. Although using KOH as activatingagent can improve the performance, but it also bring about high production costs and equipment corrosionproblems due to the large amount of KOH. In addition to common active carbons, after using the separationrecycling is difficult. The magnetic activated carbons can easily recycling but produce magnetic activatedcarbons is a hard work. Therefore this paper aim at these problems mainly takes the research work.（1） With Wucaiwan and LiuHuangGou coal as raw material, Using KOH as activating agent,investigate the potassium hydroxide dosage, terminal temperature, heating rate and constant temperaturetime influence to activated carbons specific surface area and pore structure. Confirm LiuHuangGou coalsuitable for preparation high surface area activated carbons, the best preparation conditions is weight ofKOH/weight of coal is3, terminal temperature is800℃, heating rate is6℃/min, constant temperaturetime is60min, in this conditions the sample specific surface area as high as3038m²g^-1,and pore volume is1.840cm³g^-1.（2） Research K2CO3played the role in KOH activation coal process; Through the XRD analysisconfirmed the presence of K2CO3, use thermogravimetric analysis makesure K₂CO₃decompositiontemperature. Investigate the activity and status of K₂CO₃in activation process. Propose multi-stage heattreatment can improve the efficiency of KOH to achieve reduce the potassium hydroxide dosage.Preliminary discussed the possibility of use K₂CO₃to replace of KOH.（3） By three different ways preparation magnetic activated carbon （adsorption method, solvothermal synthesis and high temperature firing method）, focusing on high temperature firing method, compare withthe other two methods this method have the simplest process. By this method samples in weight of KOH/weight of coal is1, temperature of1200℃, the magnetic activated carbon specific surface area is1554m²g^-1,and pore volume is1.567cm³g^-1, the samples has good magnetic can resistance acid corrode.（4） Using magnetic activated carbon as adsorbent, select4heavy metal ions (Cu²⁺, Pb²⁺, Cr⁶⁺and Cd²⁺)as adsorbents. Calculate the adsorption capacity and strainaway rate under different adsorption conditions.Investigated the relationship between time and concentration in activated carbon adsorption process. Theexperimental results show that the magnetic activated carbons adsorption of Cu²⁺, Cr⁶⁺, Pb²⁺is better,especially the Cu²⁺, Cd²⁺adsorption is less effective, the results that may be related to the pore structure ofactivated carbon itself.