Investigation of acidic water generated coal washing plant tailing in central Alborz- Zirab in order to decrease its environmental effects
Subject Areas :سهیل Mashrafi 1 , M.B Eslami 2
1 - عضو هیات علمی دانشگاه آزاد اسلامی واحد سوادکوه
2 - عضو هیات علمی دانشگاه آزاد اسلامی واحد سوادکوه
Keywords: Coal, Coal washing plant, Static Test,
Abstract :
Residues of mining and coal processing are among the most important resources of acidic drainageproduction in most parts of the world. So, most of the activities for determining the acidic drainageproduction resources and also the controlling and neutralizing methods of these drainages are carriedout about coal. Central Alborz coal region produces a large amount of residues, which can produceacidic waste waters. Therefore, the said studies were carried out to investigate the capability of acidicwastewater production from these residues and their effect on surface waters of the region.In primary laboratory studies carried out on residues using modified ABA static test determined thatresidues of floatation and jig are in uncertain limits. So, dynamic test method on water samples wasused to investigate the probable production of acidic wastewater generated by residues of AnjirTangeh coal washing plant. In this method, the quality of water was analyzed and investigates undertwo climatologic conditions. Samples of flowing waters around the plant were taken using thestandard sampling method No. 2347 of Iran. The results show that there were no significant statisticaldifference between the amounts of these parameters and national standard amounts. The factors likehigh hardness of water in the region because of limy layers, low underground waters level, clayminerals forming coal ash like montmorillonite that prevents penetration of waters resulting fromprecipitations into the residues and low percentage of pyrite, as the origin of acidic wastewaterproduction, caused the acidic pollution of central Alborz coal washing plant not to be a threat forenvironment of this region.
