Chemical and mineral composition of coal-series kaolin and the possibility of kaolinite purification
DOI:
https://doi.org/10.5564/bicct.v13i13.5217Keywords:
coal-series kaolin, kaolinite, particle size, dispersant, acid treatmentAbstract
In Mongolia, coal has long been utilized for power and heat generation through combustion, as well as for export after beneficiation. However, studies on the comprehensive and waste-free utilization of mineral resources associated with coal deposits have been limited. For this purpose, the chemical and mineral composition of coal-series kaolin and the dumpsite samples accompanying Mongolian coal deposits were investigated. X-ray diffraction analysis revealed that quartz, kaolinite, and muscovite are the dominant minerals, accompanied by albite and microcline. The target mineral, kaolinite, was present in the range of 2–26.2%. Sieve analysis showed that the -0.074 mm and - 0.045mm size fraction of the UH-S2 and UH-N4 samples contained the highest kaolinite contents, at 16% and 35.6%, respectively. Fractionation by particle size and beneficiation via sedimentation, followed by acid leaching, increased the kaolinite content up to 53%. Further examination of the crystal structure after acid treatment indicates slight variations in lattice parameters, leading to a change in the triclinic system of kaolinite from P1 ( a= 5.17Å; b= 8.98 Å; c= 7.35Å; α= 91.68о; β= 105.1о; γ= 89.75о) to C1 ( a= 5.15Å; b= 8.94Å; c= 7.40Å; α= 91.70о; β= 104.8о; γ= 89.82о).
Нүүрсний уурхайн хаягдал шаврын хими, эрдсийн найрлага ба каолинитыг цэвэршүүлэх боломж
Хураангуй: Манай улс нүүрсийг шатаах замаар эрчим хүч, дулаан үйлдвэрлэх, мөн баяжуулан экспортлох зэргээр ашиглаж ирсэн ч нүүрсний ордыг дагалдах эрдэс баялгийг ашиглах, хаягдалгүйгээр иж бүрэн боловсруулах судалгаа хангалтгүй байна. Иймд Монголын нүүрсний ордуудаас цуглуулсан каолинит агуулсан шавар болон хаягдлын дээжүүдийн эрдсийн болон химийн бүрэлдэхүүнийг судлав. Рентгендифрактометрийн шинжилгээгээр кварц, каолинит, мусковит зонхилж, альбит, микроклин зэрэг эрдсүүд дагалдан илэрсэн бөгөөд каолинитын агуулга 2-26.2% байв. Шигшүүрийн шинжилгээгээр UH-S2 болон UH-N4 дээжүүдийн -0.074 мм ба -0.045 мм ширхэглэлтэй фракцуудад каолинитын эрдсийн агуулга хамгийн өндөр буюу 16% ба 35.6% тус тус байсан. Ширхэглэгээр ангилан ялгаж, суспензжүүлэн тунаах аргаар баяжуулсан дээжийг хүчлийн уусгалтаар боловсруулахад каолинитын агуулга 53% хүртэл нэмэгдсэн. Хүчлийн уусгалтын дараа каолинитын талст бүтцийн оронт торын параметрүүд бага зэрэг өөрчлөгдөж, триклиник системийн P1 сингон (хавтгайн параметр: a=5.17Å; b=8.98 Å; c=7.35Å; α=91.68о; β=105.1о; γ=89.75о)-оос С1 сингон (хавтгайн параметр: a=5.15Å; b=8.94Å; c=7.40Å; α=91.70о; β=104.8о; γ= 89.82о) руу шилжсэн өөрчлөлт ажиглагдав.
Түлхүүр үг: нүүрсний уурхайн хаягдал шавар, каолинит, ширхэглэл, дисперсант, хүчлийн боловсруулалт
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