炼焦煤干法预排矸工艺研究

Study of the coking coal predeshaling process using dry method

为了研究干法预排矸工艺对炼焦煤选煤厂生产的影响,以石壕煤矿原煤分选工艺系统为研究对象,在分析直接水洗时高灰细泥对重介、浮选工艺效果影响的基础上,采用复合式干选机对原煤进行了预排矸效果的研究。研究结果表明:当>3 mm原煤预排矸后再回掺入<3 mm原煤,可使50~1 mm原煤灰分从63.76%降至46.08%,重介系统入料灰分大幅度降低;浮选入料中所含<0.25mm粒级产率和灰分分别从22.77%、40.06%降至21.58%、37.53%,浮选入料质量得到改善;在总精煤灰分为10.38%的前提下,精煤产率由34.88%提高到37.76%。因此,炼焦煤干法预排矸工艺具有可行性。

In order to explore the effect on the operation of coking coal preparation plant produced by the use of the raw coal dry predeshaling process,a study is made with the raw coal washing system of Shihao Mine's coal preparation plant as the object.It is found that the existing heavy medium washing system and flotation system all work with an unstatisfactory performance due to the presence of high-ash fine slime produced in the direct wet cleaning process.Based on the analysis of the adverse effect,the effect of coking coal predeshaling process using compound dry cleaning machine is investigated.As revealed by test result,when the predeshaled>3 mm raw coal is mixed with the<3 mm raw coal,the ash of the 50~1 mm raw coal is reduced from 63.76%to 46.08%,enabling the feed to heavy medium washing sys-tem to be dramatically decreased in ash;the feed to flotation system is improved in quality as the yield and ash of the<0.25 mm size in feed drop respectively from 22.77%to 21.58%and from 40.06%to 37.53%;and while ensuring that the total clean coal product has an ash value of 10.38%,the yield of clean coal can see a rise from 34.88%to 37.76%.It proves that the use of the proposed deshaling process is technically feasible.