Shanxi Fenxi Xinyu Coal Industry Co., Ltd. Xinyu Coal Preparation Plant
Type: Coking coal preparation plant
Scale: 3.00Mt/a
Contracting mode: partial contracting and renovation projects
Process: The 50-0mm raw coal is fed into a three product heavy medium cyclone without desliming, classification, and pressure. The coarse coal slurry is sorted by the coal slurry heavy medium cyclone, the fine coal slurry is sorted by a jet flotation machine, and the flotation clean coal is dehydrated and recovered by a combination of a pressure filter and a pressure filter. The tail coal slurry water is concentrated in a thickener and then dehydrated and recovered by a fast opening pressure filter. The washing water is closed loop and designed to be environmentally friendly.
Special note:
New processes such as non classification and non desliming selection of raw coal, coal slurry heavy medium cyclone separation technology and process, two-stage flotation of coal slurry, two-stage dewatering of clean coal slurry, two-stage concentration and recovery of tail coal slurry water, and desliming flotation are designed by Guohua.
Compared with the original design of raw coal desliming and selection, two product heavy medium cyclone roughing and selection, and Jamson flotation column separation process, the sales revenue of one ton of raw coal after selection increased by 60.83 yuan, and the annual profit and tax increased by 18.8145 million yuan.
The Xinyu Coal Preparation Plant consists of two production systems, the first and second workshops. The process and equipment are shown in Table 1.
After testing, the technical indicators of two heavy medium coal preparation processes and two flotation processes are listed in Tables 2 and 3.
(Table 1) Two processes and equipment
车间 | 工艺 | 重介质分选设备及型号 | 煤泥分选设备 | 处理能力 Mt/a | 投产 日期 | 设计单位 |
一 | 原料煤脱泥 | 两段有压给料两产品重介质旋流器（LA1150) | RC分选机(1800)、杰姆逊浮选柱粗、扫选(4500/52) | 2 | 2005.1 | 某外国公司 |
二 | 原料煤不脱泥 | 无压给料三产品重介质旋流器(3GHMC1500/1100) | 煤泥重介旋流器(SHMC550)、喷射式浮选机(FJC44) | 3 | 2011.1 | 国华科技 |
(表2) 两种工艺重选技术指标
车间 | 原料煤 灰分% | 精煤 灰分% | 中煤，% | 矸石，% | 分选密度，kg/L | 介耗 kg/t | 重介旋流器电耗 kw·h/t | 处理能力,t/h | |||
灰分 | 带精 | 灰分 | 带煤 | 矸石段 | 精煤段 | ||||||
一 | 34.51 | 9.67 | 26.47 | 11.57 | 62.8 | 20.82 | 1.545 | 1.538 | 2.7 | ＞1.55 | ≤270 |
二 | 37.94 | 9.56 | 38.24 | 7.02 | 75.36 | 0.3 | 1.834 | 1.5 | 1.7 | 0.72 | 615 |
(表3) 两种工艺浮选技术经济指标
车间 | 入料灰分,% | 精煤，% | 尾煤灰分，% | 完善指标，% | 浮选机型号 | 统计时间 | |
产率 | 灰分 | ||||||
一 | 18.5 | 26.62 | 9.65 | 21.71 | 15.63 | JMECELL | 2011.07-09 |
二 | 23.91 | 69.56 | 10.11 | 55.44 | 52.76 | FJC44-4 | 2012.02-09 |
Under the condition that there is no obvious difference in ash content of commercial clean coal, the production rate of commercial clean coal in Workshop 2 is 6.97 percentage points higher than that in Workshop 1, 4.55 percentage points lower than that in middling coal belt, and 20.53 percentage points lower than that in gangue belt. According to statistics from January to August 2012, the water consumption per ton of coal in Workshop 2 was 0.075m3, and the electricity consumption per ton of coal was 5.06kw/h.