The Research Of Removing Coal From Slag In Fertilizer Factory And Feasibility Study On The Project

Slag is a by-product of the fertilizer gas production processing, seprate the C from slag is the precondition of multipurpose use.The contains of C in slag is 22.65%,its existing form is amorphous carbon.the minerals of the slag are mullite category, quartz and potash feldspar, etc. Analysis them contact angle we can find out: The C's contact angle is increasing with the increasing of collector, the minerals is opposite, so them floatability is more distinguished. As a resultof this. we use the flotation to solve the slag.The result of theoretical analysis shows that: The strong attractive force between Cand collectors interface, but between gangue included in ash slag and collectors is repulsive force , so the collectors can lead to them easiest distinguished in floatability . The ascending condition of bubbles schlepping mineral particlesis D>d．((δ_固-δ_液)/δ_液)^1/3。The constraint condition of mineral particles adhering to bubblesfirmly is sinθ>gk³Î´_液/6γ_{液气}d²+d/4γ_{液气}(2γ_{液气}/R-hgδ_液).So in flotation the particles musthave a suitable size.Through flotation, the best optimal particle size is 0.2mm for the d₈₀. compared with the kerosene, light diesel oil and pinitol oil, butanol, octanol, determined the collecter is light diesel oil and frother is octanol. The process course is: In roughing collector (light diesel oil) is 180g/t, bubble agent (octanol) is 200g/t, the flotation time is 5min, the mineral density is 25%, gas filling volume is 0.35 m³/m² min, the sepration effciency of Newton is 52.6%; in refined light diesel oil is 24g/t, bubble agent (octanol) is 48g/t, the flotation time is 3min, yields of determination C is 83.53%, the recovery is 63.5%. According to laboratory data, the best program for industrial flotation is "a crude, sweeping away and a sperm." The milling equipment is the lattice-type Iongituba ball mill. Flotation machine is XJM-4. According to the actual situation of Shanxi-FengXi-fertilizer plant, analyzed the technical and economic of the flotation system. Its NPV is more larger than zero; Its fixed yield rate nearly 136.1%.So this programe is feasibility.