CN101607225A

CN101607225A - A kind of sorting process of superfine beans

Info

Publication number: CN101607225A
Application number: CNA2009100889679A
Authority: CN
Inventors: 肖宝清; 马佳; 黄雪洁
Original assignee: University of Science and Technology Beijing USTB
Current assignee: University of Science and Technology Beijing USTB
Priority date: 2009-07-15
Filing date: 2009-07-15
Publication date: 2009-12-23

Abstract

A kind of floatation process of superfine beans belongs to coal flotation field.Be applicable to the superfine material that other ultra-fine beans of stage flotation-0.125mm level and the difficult tail coal (ash content 30～45%) that selects the coking coal flotation to produce are afterwards regrinded and become.This technology is to pass through selective flocculation in the characteristics of handling superfine beans or superfine material, make superfine charcoal particle progressively grow up into floc sedimentation, meanwhile ash content is progressively disallowable, thereby reaches the purpose that improves flotation effect, adopt conventional floatation process then, propose cleaned coal.Through verification experimental verification, the superfine beans of stage flotation-0.125mm grade (0.074mm80%, ash content 32%) is a raw material, and the floatation clean coal productive rate is 70%, ash content about 8%; With difficulty select the coking floating tail-coal (ash content 38% ,-0.074mm51%) be raw material, the ore grinding time is that (0.074mm90%), the floatation clean coal productive rate reaches 65% to 15min, ash content 11%.Can improve clean coal yield, rationally utilize coal resources, promote the coking floating tail-coal and be worth, have great social significance and economic benefit.

Description

A kind of sorting process of superfine beans

Technical field

The invention belongs to coal flotation field, be used for other ultra-fine beans of stage flotation-0.125mm level and difficult a large amount of floating tail-coals of producing after coking coal flotation coal-grinding again that selects, recycle.

Background technology

For traditional floatation process of ultra-fine beans, because its undersized, intergranular total surface area increases, and the interaction force between the particle also increases, thereby has reduced the flotation of floatation process, causes FLOTATION SEPARATION efficient greatly to reduce.And generally more than 60%, this is a floatation process effect severe exacerbation, and whole production is caused adverse effect in the ultra-fine beans floatation feed of some coal preparation plants-200 purpose amount.

Why difficulty is selected to select the coking tail coal with respect to difficulty, mainly be because its Khenpo fine size, under-0.074mm50% situation, carbon does not have monomer dissociation, and fine size, influences its separating effect, so it is poor to open coal flotation effects such as Luan at present, produce a large amount of floating tail-coals, and tail coal ash content height, about about 40%.Simultaneously, still have very high value in the coal, floating tail-coal is just sold as mixing electric coal at present, at this situation, the design studies floating tail-coal further reclaims carbon technology, no matter brings into play in great shortage coal and is worth, and rationally utilizes coal resources, still promote the tail coal price, have great social significance and economic benefit.

Summary of the invention

The present invention seeks to solve ultra-fine beans or difficulty and select problems such as coking tail coal tradition floatation process flotation effect is poor, floatation clean coal ash content height, this raw materials technology comprise stage flotation-0.5mm primary slime classification overflow-the superfine beans (ash content range 20～50%) of 0.125mm and the difficult tail coal (ash content 30～45%) that produces after the coking coal flotation coal-grinding again that selects.

A kind of sorting process of superfine beans, it is characterized in that the method that adopts selective flocculation to combine with traditional handicraft, to the sorting of flocculating of superfine beans, make fine form the floc sedimentation bigger than coarsegrain, in the floc sedimentation forming process, pick out the ash content that is mingled with, and floc sedimentation is carried out efficient sorting, reach the purpose that not only reduces the floatation clean coal ash content but also improve clean coal yield by conventional method for floating; For selecting the coking coal floating tail-coal, then at first it carries out monomer dissociation by ore grinding, and then carries out flocfloatation by adding agglomerator, and effect is to improve separating effect, adopts conventional floatation process at last, proposes cleaned coal.

Stage flotation superfine particle coal particle size requirement-0.125mm accounts for more than 60%; Difficulty selects the coking coal floating tail-coal then to require its granularity-0.074mm to account for more than 40%.Select the coking floating tail-coal to regrind to difficulty, ore grinding time requirement is 5～180min.Simultaneously, in the flocfloatation process, agglomerator is selected the castor-oil plant wet goods usually for use, and it is 1～60min that the flocculation mixing time requires, and it is 1～5000r/min that stirring intensity requires, and it is 1～100kg/ ton (coal-based) that the flocculant consumption requires.

Through verification experimental verification, the superfine beans of stage flotation-0.125mm grade (0.074mm80%, ash content 32%) is a raw material, and the floatation clean coal productive rate is 70%, ash content about 8%; With difficulty select the coking floating tail-coal (ash content 38% ,-0.074mm51%) be raw material, the ore grinding time is that (0.074mm90%), the floatation clean coal productive rate reaches 65% to 15min, ash content 11%.So this technology is feasible technically.

This technology is followed conventional process flow, and the assistant chemical medicament.Growing tension trend in the face of the market energy resources, the price of coal increases gradually, make resource recycling, raising resource utilization become a kind of trend, the technology that superfine beans, floating tail-coal reclaim carbon has had feasibility technically, simultaneously in this technology, cost of investment is low, and the expection high efficiency has made it to have had economically the possibility that develops.And the phenomenon that this technology has been avoided effectively, and coal utilizaton rate is low, cleaned coal is selected coal resource waste in the process has very important social effect and economic benefit.

Description of drawings

What Fig. 1 was the present invention about superfine beans and floating tail-coal carries the carbon artwork.

The specific embodiment

Embodiment one:

Superfine beans (0.074mm80%, ash content 32%) with stage flotation-0.125mm grade is a raw material, the reunion flotation, agglomerator castor oil addition 1% (coal-based), mixing speed 2000r/min, mixing time 2min, the floatation clean coal productive rate is 70%, ash content about 8%.

Embodiment two:

With difficulty select the coking floating tail-coal (ash content 38% ,-0.074mm51%) be raw material, the ore grinding time be 15min (0.074mm90%), agglomerator castor oil addition 1% (coal-based), stirring intensity 1500r/min, mixing time 5min, the floatation clean coal productive rate reaches 65%, ash content 11%.

Claims

1. the sorting process of a superfine beans, it is characterized in that the method that adopts selective flocculation to combine with traditional handicraft, to the sorting of flocculating of superfine beans, make fine form the floc sedimentation bigger than coarsegrain, in the floc sedimentation forming process, pick out the ash content that is mingled with, and floc sedimentation is carried out efficient sorting, reach the purpose that not only reduces the floatation clean coal ash content but also improve clean coal yield by conventional method for floating; For selecting the coking coal floating tail-coal, then at first it carries out monomer dissociation by ore grinding, and then carries out flocfloatation by adding agglomerator, adopts conventional floatation process at last, proposes cleaned coal.

2. a kind of floatation process of superfine beans according to claim 1, its raw material comprise superfine beans and the difficult tail coal that produces after the coking coal flotation coal-grinding again that selects of stage flotation-0.5mm primary slime classification overflow-0.125mm; Superfine particle ash content of coal scope 20～50%, tail coal ash content 30～45%; Stage flotation superfine particle coal particle size requirement-0.125mm accounts for more than 60%; Difficulty selects the coking coal floating tail-coal then to require its granularity-0.074mm to account for more than 40%; Select the coking floating tail-coal to regrind to difficulty, ore grinding time requirement is 5～180min; Simultaneously, in the flocfloatation process, agglomerator is selected castor oil for use, and it is 1～60min that the flocculation mixing time requires, and it is 1～5000r/min that stirring intensity requires, and it is that 1～100kg/ ton is coal-based that the flocculant consumption requires, coal-based: the dry coal amount of expression pan feeding.