Nature protection technologies

3.5.6. Obtaining different substances from coal combustion by-products

Part 3. ASH AND SLAG HANDLING

3.5. Applications of ash and slag from power coals

3.5.6. Obtaining different substances from coal combustion by-products

3.5.6.1. Manufacture and properties of magnetite dust from coal combustion products

J. J. Hycnar, Ecocoal Consulting Center Katowice, Poland

B. Kochański, Wyższa Szkoła Zarządzania Marketingowego i Języków Obcych, Katowice, Poland

B. Tora AGH - University of Science and Technology, Poland

 Hard and brown coal combustion in a pulverized-fuel boiler is accompanied by forming ferromagnetic compounds contained in fly ash and slag. The ferromagnetic compounds can be found as follows: the highest quantity in the ash of silicate kind, lower quantity in the ash of aluminum kind, and the lowest quantity in the calcium kind of ash. On the basis of test results on the content of magnetic compounds and total content of iron compounds and two-valued iron there were prepared technical and economic criteria regarding the separation of magnetite dust from fly ash.

Part 3. ASH AND SLAG HANDLING

3.5. Applications of ash and slag from power coals

3.5.6. Obtaining different substances from coal combustion by-products

3.5.6.2. Integrated recycling of ash and slag of Ekibastuz coals into aluminum oxide, aluminium salts, ferrosilicon and cement

S.S.Nurkeyev, D.T.Matayeva, Kazakh National Technical University named after K.I.Satpayev, Almaty, Kazakhstan

 The paper contains the results of the designed alkaline and acidic methods of integrated recycling of power and self-disintegrated calcium aluminate slags, anorthite cakes and ash of low-temperature combustion of Ekibastuz coals with the output of end products. It shows the advisability of reorientation of the raw materials base of the Pavlodar aluminium plant from bauxites to self-disintegrated slags produced from ash slag of Ekibastuz coals, and of using released capacities of sintering process stage for the production of construction materials.