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Blended frother for producing low ash content clean coal through flotation

A foaming agent and foam flotation technology, applied in flotation, solid separation, etc., can solve the problems of not being able to produce low clean coal, difficult to clean coal with ash content, not all coarse particles and ultrafine particles are effective, etc.

Inactive Publication Date: 2010-10-13
TATA STEEL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Common problems associated with conventional frothers and recently developed frothers are: I) For wide particle size distribution flotation feeds (0.5 x 0.0 mm), not all are effective on both coarse and ultrafine particles
II) Inability to produce clean coal with low ash content from dispersed high ash mineral particles and difficult to float coals like Indian Coal

Method used

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  • Blended frother for producing low ash content clean coal through flotation
  • Blended frother for producing low ash content clean coal through flotation
  • Blended frother for producing low ash content clean coal through flotation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0030] A typical semi-bituminous flotation feed coal sample with a size of less than 0.5 mm was used in this study. The nature of coal samples is difficult to float. Ash analysis according to ASTM D 3174-73 standard indicated that the sample contained 24.5% ash. Gravimetric and ash distribution analyzes by size were performed on typical flotation feed samples. The flotation feed contained a high percentage (20%) of oversize fraction, ie -1+0.5 mm, with 23.5% ash. The oversize fraction of -0.075 mm has the largest weight contribution, about 50%, in the flotation feed content. A conventional blowing agent used for comparison is methyl isobutyl carbinol (MIBC). The improved blowing agent of the present invention described above was compared to MIBC. The flotation rates for different clean coals are shown in figure 1 . The results for each frother are given as a function of the optimum frother and collector levels as a function of the experiment.

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Abstract

An improved frothing agent adaptable to froth flotation process to enhance coal selectivity for separation and efficiency of the forth flotation process comprises :- A blended mixture of Ketone (2,6 Dimethl-4-Heptanone) - 85-89% (Wr%) Ester molecule (Tetrahydrofurfuryl acetate) - 10-12% (Wt%) Epoxide conditioner (1,2-Epoxydodecane) - 0.25-0.30%(Wt%) Water - 4.75-5.25%(Wt%).

Description

field of invention [0001] The present invention relates to froth flotation of finely divided coal particles for the separation of ash and carbon. In particular, the present invention relates to improved frothers suitable for froth flotation processes to increase the efficiency and coal selectivity of the froth flotation processes. Background of the invention [0002] In the coal industry, various types of shale and clay are produced as mixtures with coal. In order to increase the calorific value of coal and reduce freight costs, complex coal washing methods are usually used to reduce the total ash content. In this coal washing process, the coal is graded to a certain size, typically less than 15 mm and greater than 1 / 2 mm, and then fed into a dense medium cyclone. [0003] Conventional methods for separating fine particles (less than 1 / 2 mm) of coal contained in coal slurries using froth flotation processes are well known. The froth flotation process involves introducing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B03D1/02B03D1/008
CPCB03D1/008B03D2201/04B03D2203/08
Inventor A·K·古普塔P·库玛D·巴哈塔查杰
Owner TATA STEEL LTD
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