细嵌布高硫煤深度降灰脱硫的经济评价

采用先进的煤炭深度脱硫技术对细嵌布的四川磨心坡煤进行精选,得到满意的降硫和脱灰效果。这种技术的关键是煤炭的超细磨,先进的分选技术和细粒煤的脱水,首先对原料煤进行煤质和岩相分析,而后进行超细磨和深度分选研究,用先进的煤炭物理深度分选技术可将煤的灰分降低到６％,硫分降低到１．２％以下,可燃体固收率为６４％。常规浮选配合部分浮选原料直接深加工可以获得综合降灰和脱硫效果;常规浮选配合尾煤深加工也可以获得综     

超纯煤油团聚脱灰工艺的影响因素──超纯煤的选制工艺专题之二

本文在专题之一的基础上，论述了油团脱灰法制取超纯煤的一些主要影响因素，并指出了提高分选效果的途径。     

自生介质旋流器分选粉煤的初探

传统的粉煤处理设备，主要有浮选机，浮选过程中，电耗大，药耗大，且不易控制和管理，采用自生介质旋流器分选粉煤，同样能达到理想的效果，从而开辟了一条处理细粒煤的新途径。     

我国细粒煤脱水技术与设备研究现状

搞好细粒煤分选是生产洁净煤的重要途径,选煤厂出厂产品水分的高低直接受细粒煤水分高低的影响。本文就加强细粒煤脱水的重要性进行论述,并介绍了近期研制成功的应用于工业生产的细粒煤脱水技术与设备     

全国细粒煤分选技术及设备交流研讨会议在南京召开

随着我国采煤技术的发展及机械化、自动化水平的逐年提高,选煤厂入选原煤中的细粒煤含量越来越高,尤其是3～0．5mm的细粒煤逐渐成为炼焦煤选煤厂入选原煤的主导粒级,因此细粒煤分选技术及设备已目益成为选煤行业讨论的热点,受到选煤界的高度重视。为了促进细粒煤分选技术的发展,加快交流推广国内外先进适用的细粒煤分选技术、设备和工艺,2009年6月3—6日,中国煤炭加工利用协会在南京组织召开了全国细粒煤分选技术及设备交流研讨会议。中国煤炭加工利用协会副理事长兼中国煤炭工业协会选煤分会会长张绍强到会并作了报告,中国煤炭运销协会武承厚副会长出席了会议,来自国内外有关煤业集团公司、煤矿、选煤厂、选煤设备制造或经销公司的200多名代表参加了会议。     

细粒煤全氯乙烯脱灰实验研究

细粒煤全氯乙烯分选是一种新颖的燃前分选工艺。本文采用了全氯乙烯作为溶剂，对石台和七台河煤样进行了分选研究，取得了较好的效果。     

炼焦煤选煤厂提高选煤产率的新思路

结合古交某炼焦煤原煤煤质化验资料,提出对原煤进行初次低密度分选,分选完成后对低密度中煤进行超细磨矿,使煤与矸石充分解离,然后再采用絮团浮选的方式对其进行分选。在原有精煤灰分要求不变的情况下,将初次分选精煤与浮选精煤进行配比而得到最大精煤产量,达到提高精煤产率的目的。     

浮选尾煤中高附加值粗颗粒的回收研究

分析了某选煤厂浮选尾煤的性质,在磨机中将尾煤中的粗颗粒煤超细粉碎后,利用絮团浮选法进行分选,可得到灰分为8.58%~9.04%的精煤,产率为70.44%~73.53%;通过成本核算,发现将粗颗粒煤泥深加工后的经济效益远远高于尾煤直接出售。     

有关大型无压给料三产品重介质旋流器若干问题的探讨

本文对大型重介质旋流器的细粒煤分选效果、动力消耗等问题进行探讨 ,说明国华科技系列大型无压给料三产品重介质旋流器对细粒级煤也有良好的分选效果 ,所取得的经济效益远大于略有增高的动力消耗     

振动重介质流化床细粒焦渣混合物的分选

在间歇振动流化床中研究了细粒焦渣混合物的分离．通过考察细粒焦、细粒渣及细粒焦渣混合物的入选体积量对床层密度和分选效率的影响，得出适宜的操作条件．在此条件下对细粒焦渣混合物进行了分选实验，得到了较佳的分离效率。     

Flotation of Fine Gold Particles by the Assistance of Coal-Oil Agglomerates

This paper describes the use of coal-oil agglomerates in flotation to increase the gold recovery from an ore containing fine gold particles. The effects of operating parameters on gold flotation recovery such as oil type, particle size of agglomerating material, agglomerate/ore and oil/ore ratios were investigated. The studies showed that petroleum oils are more effective than vegetable oils in oil agglomeration of Kozlu coal and coal-oil assisted gold flotation. Gold recovery can be increased using a higher amount of agglomerates in the process; however, gold grade of the flotation concentrates is reduced significantly. The use of bridging oil at high concentrations in the agglomeration process provides high-grade gold concentrates, but lower recoveries. The utilization of coarser coal particles in the coal-oil agglomeration stage leads to higher selectivity and recovery values for gold particles.     

The enrichment of fine particles of coal by aggregation part II. The use of the selective aggreagation method

Tests on aggregation enrichement of fine particles of coal are presented. The selective aggregation process, named ‘shear flocculation’ by Warren [7, 8], was conducted in a cylindrical beaker. The aggregation of the coal grains results from the action of shear forces while the feed is mixing with the collector (diesel oil). The aggregates formed were then separated from gangue by aeration in a flotation machine. This allows for almost complete recovery of coal. Preliminary aggregation of coal grains made it possible to eliminate the frothing agents usually needed in such a process.     

Flotation response of coal washery reject fines: Characteristics,process optimization,and oxidation

The present paper outlines the characterization, electrokinetic behaviour, and flotation response of rejected coking coal fines with 32.5% ash generated in a coal washery in Eastern India. The response methodology and central composite rotatable design (RSM-CCRD) were used for the process modelling and optimization of the flotation process using diesel, methyl isobutyl carbinol (MIBC), and sodium hexametaphosphate as a collector, frother, and depressant to maximize ash reduction, yield, and combustible recovery. At optimum condition, a 9.7% clean ash coal was achieved with a 63% yield at collector, frother, and depressant dosages of 0.78, 0.31, and 0.80 kg/ton, respectively. The model prediction and experimental data corroborated sufficiently. Subsequently, within 1 year, the fines oxidized and did not float with the collector. Fourier-transform infrared spectroscopy (FTIR) confirmed surface oxidation on oxidized coal. The oxidized coal responded favourably to acid oil, a vegetable oil refinery waste. With acid oil as a collector, the oxidized coal can upgrade to 12% clean ash coal with a 60% yield; the combustible recovered is 80%. The work indicates successful upgradation of fresh and oxidized coal using the froth flotation process.     

Hydrophobic Flocculation Flotation for Beneficiating Fine Coal and Minerals

ABSTRACT

It is shown that hydrophobic flocculation flotation (HFF) is an effective process to treat finely ground ores and slimes so as to concentrate coal and mineral values at a fine size range. The process is based on first dispersing the fine particles suspension, followed by flocculation of fine mineral values or coal in the form of hydrophobic surfaces either induced by specifically adsorbed surfactants or from nature at the conditioning of the slurry with the shear field of sufficient magnitude. The flocculation is intensified by the addition of a small amount of nonpolar oil. Finely ground coals, ilmenite slimes, and gold finely disseminated in a slag have been treated by this process. Results are presented indicating that cleaned coal with low ash and sulfur remaining and high Btu recovery can be obtained, and the refractory ores of ilmenite slimes and fine gold-bearing slag can be reasonably concentrated, leading to better beneficiation results than other separation techniques. In addition, the main operating parameters affecting the HFF process are discussed.     

The Influence of Reagent Dosage on the Floatability of Pyrite During Coal Flotation

Abstract

In general, as the quantity of frother and/or coal collector is increased, so too, does the flotation of the undesired pyrite. The problem is particularly serious with oily reagents. For some coals, however, a collector, such as fuel oil, is required to achieve a high coal recovery. This requires a compromise between the competing desires of a high coal recovery and a high pyrite rejection. This study gives the quantitative effect of reagent dosage on coal and pyrite floatability and details several means of minimizing pyrite floatability during coal flotation. The effect of fuel oil on coal flotation is especially interesting in that the flotation process changes from froth flotation to emulsion or agglomerative flotation as the amount of oil is increased. This phenomenon provides an additional method of rejecting pyritic sulfur.     

聚丙烯酰胺作用下的煤泥絮凝浮选

用六偏磷酸钠做分散剂,煤油做捕收剂,进行了不同聚丙烯酰胺（ＰＡＭ）用量下的煤泥絮凝浮选,并在此基础上,对不同煤油用量下,ＰＡＭ对煤泥浮选效果的影响规律进行了对比研究。ＰＡＭ可明显提高浮选速度和精度产率,并节省煤油用量,１ｇＰＡＭ相当于１００ｇ煤油。     

煤油乳化捕收剂在细粒煤浮选中的研究

针对细粒煤泥的浮选特性,将选煤用煤油捕收剂乳化处理后使用,结果表明：乳化煤油具有捕收能力强、选择性高的特点,可以显著提高细粒煤的浮选效果,降低捕收剂消耗,具有显著的经济效益及社会效益,并从理论上对乳化剂的作用机理进行了阐述。     

An Electrokinetic Study on the Oil Flotation of Oxidized Coal

Abstract

The objective of this investigation was to study the electrokinetic behavior of oxidized coals and of hydrocarbon emulsion droplets of flotation reagents to indicate the feasibility of separating the oxidized coals from ash materials and pyrite by an oil flotation process. The effects of surfactants and hydrolyzed metal ions were also included. The electrokinetic behavior of the oxidized coals and the hydrocarbon emulsion droplets were studied by an electrophoresis technique. Generally the isoelectric point (IEP) of the coals decreased with increasing degree of oxidation.

A model of selective flotation of oxidized coal is postulated on the basis of the electrokinetic results. This model simply states that in the presence of a suitable amount of collector and frother, the optimal selective flotation of oxidized coal will occur at the IEP of the oxidized coal. To achieve this condition at the coal surface, it is necessary to adsorb heavy metal hydroxide ions prior to flotation and to absorb hydrocarbon oil droplets containing positively charged organic functional groups during flotation. Oxidized coal becomes more hydrophobic at its IEP because most of its surface is relatively non-polarizable. In contrast, pyrite and ash minerals have relatively polarizable surfaces and remain in suspension even when they are at an IEP.     

高硫煤浮选脱硫实验研究

采用浮选法研究了磨矿粒度、捕收剂用量、起泡剂用量、抑制剂用量等因素对高硫煤脱硅效果的影响,结果表明,磨矿粒度-200目占48.48%,捕收剂用量1.4kg/t,起泡剂90g/t,抑制剂1.5g/L,浮选时间5min,浮选温度为室温,可获得较好的脱硫效果,脱硫率达到50%左右。论文的研究为高硫煤的浮选法脱硫提供一定的参考依据。     

纳米气泡在微细粒矿物浮选中的应用研究现状

我国矿石资源禀赋差,很大一部分微细粒矿物资源难以回收.提高微细粒矿物资源的综合利用率是解决我国现阶段面临的矿产资源匮乏问题最有效的途径之一.文中主要对微细粒矿物的分选现状、纳米气泡的发展历程、形成方法、稳定性研究现状及在矿物浮选中的应用现状进行讨论与分析.纳米气泡浮选是针对微细粒矿物粒度小、质量轻、比表面积大、表面能高...