The sample is the coal from Jiangjunmiao Xinjiang.At first

its appropriate conditions for direct liquefaction without catalysts were obtained by L9(34);then the influences of steelmaking flue dust and with the help of sulphur on the liquefaction performances were investigated;finally

the steelmaking flue dusts were composited with NiSO4 and CoSO4 respectively by methods of infusion and mechanical mixing

then

the influences of modified steelmaking flue dusts on the liquefaction performances were researched.The results are that

the sample has a characteristic of "four high and three low"

i.e.high volatile

vitrinite

sulphur and H/C as well as low inertinite

ash and moisture;according to the structure-chemical exponent calculating model in Russia

its unsaturation degree δ is 8.72

deoxidation exponent B is15.36

so the sample is suitable for liquefaction;without catalysts

on the appropriate liquefied conditions of P(H2) = 6.5MPa

T = 420 C and S / C(ratio of solvent to coal) = 2:1

its oil yield and conversion were 61% and 85%;as a catalyst of steelmaking flue dust and sulphur

its oil yield and conversion reached 72.10% and 88.20%;the catalyst of steelmaking flue dust/Ni has better action

its liquefaction yield was 80.36%;the action order of those catalysts is steelmaking flue dust /S ≈ steelmaking flue dust/S /Ni ≈ steelmaking flue dust /Ni>steelmaking flue dust.