无催化氧化煤油对低阶煤泥的浮选效果研究

Study on flotation effect of low-rank coal slime with oxidized kerosene without catalyzing

为了解决传统浮选药剂浮选低阶煤时出现的捕收能力差、药剂消耗高的缺点,采用无催化氧化的方式制备了氧化煤油捕收剂,对煤油难以浮选的鄂尔多斯葫芦素煤进行了浮选试验。结果表明:在氧化煤油用量2 000 g/t,仲辛醇用量100 g/t时,可燃体回收率达90.62%,精煤灰分为11.89%;作为复合型浮选剂单独使用,其用量在1 500 g/t时,可燃体回收率达81.02%,精煤灰分为7.72%,浮选效果良好。按照官能团种类将氧化煤油分离成4种:非极性烃类组分、极性非酸类(羟基、羰基)组分、游离酸(羧基)组分和结合酸(酯水解酸)组分,并通过红外光谱手段对氧化煤油及各分离组分的主要官能团种类进行测定,发现氧化煤油中各可测分离组分的浮选性能从大到小依次为游离酸组分>极性非酸类组分>非极性烃类组分,结合酸组分须进一步验证。

In order to solve the disadvantages of traditional flotation agents,such as poor collection ability and high chemical consumption,the oxidized kerosene collector was prepared through non-catalytic oxidation,and flotation tests were performed on Hulusu coal which was difficult to floate by kerosene. The results showed,when the amount of oxidized kerosene was 2 000 g/t and the amount of secondary octanol was 100 g/t,the combustible recovery rate reached 90.62%,and the clean coal ash was 11.89%. As a composite flotation agent used alone,when the amount of oxidized kerosene was 1 500 g/t,the combustible recovery rate reached 81.02%,and the clean coal ash was7.72%. The oxidized kerosene is separated into four components according to the type of functional group： non-polar hydrocarbons components,polar non-acids components（ hydroxyl and carbonyl groups）,free acid components（ carboxyl group） and bound acid components（ ester group）,the oxidized kerosene and its separated components are determined by infrared spectroscopy. The flotation performance of each separated component of oxidized kerosene was measured and analyzed,the results showed that the collection ability from strong to weak was free acid components,polar non-acids components,non-polar hydrocarbons components,bound acid components should be further verified.