种太西无烟煤的可选性分析

在分析了红梁原煤和白芨沟原煤煤质特征的基础上,采用筛分试验和浮沉试验分别研究了红梁原煤和白芨沟原煤的可选性。筛分试验表明:2种太西无烟煤具有较为相近的粒度组成,煤样以中间粒级为主,小粒级和大粒级相对较少,红梁原煤8～2mm产率最多为38.18%,白芨沟原煤20～8mm产率最多为31.74%;红梁原煤各粒级煤样灰分均明显小于同粒级的白芨沟原煤灰分,2种太西无烟煤均以中间粒级煤样灰分最低,红梁原煤20～8mm灰分最低为2.86%,白芨沟原煤20～8mm灰分最低为7.11%。浮沉试验表明:洗选灰分小于3.10%的超低灰洗精煤时,红梁原煤精煤理论产率可高达97.70%,δ±0.1含量仅为1.91%,属易选煤;洗选灰分小于3.10%的超低灰洗精煤时,白芨沟原煤精煤理论产率仅为79.80%,δ±0.1含量为21.90%,属较难选煤,如用于洗选灰分小于6.00%的低灰煤时,精煤理论产率可高达93.60%,δ±0.1含量为30.60%,属难选煤。 Based on the coal quality characteristics of Hongliang raw coal and Baijigou raw coal,carried out the screening and float-and-sink analysis to investigate their washability. The screening analysis show that those two Taixi coal possess similar granularity group,mainly in the middle of coal sample size,small and large sizes are relatively small. The highest yield of Hongliang raw coal whose granularity ranges from 8 mm to 2 mm is 38.18 percent,while that of Baijigou raw coal whose granularity ranges from 20 mm to 8 mm is 31.74 percent. Comparing those two coal with same granularity,the ash of various size for Hongliang raw coal are smaller than those for Baijigou raw coal and the ash of intermediate size fractions is the lowest. The minimum ash of 20 mm to 8 mm is 2.86 percent for Hongliang raw coal,7.11 percent for Baijigou raw coal. Float-and-sink analysis show that,if the ash content of ultralow ash clean coal is less than 3.10 percent,the theoretical yield of clean coal reaches up to 97.70 percent,and the "Easy choice" for δ ±0.1 content is only 1.91 percent,the theoretical yield of clean coal is only 79.80 percent,and the "Easy choice" for δ ±0.1 content is only 21.90 percent. The theoretical yield of clean coal reaches 93.60 percent,and it is "Difficult choice" for δ ±0.1 content is 30.60 percent while the ash content of lowash clean coal is less than 6.00 percent