CN101757974A

CN101757974A - Grading method for recovering refined coal from coal slime

Info

Publication number: CN101757974A
Application number: CN201010300674A
Authority: CN
Inventors: 石建新
Original assignee: ZIBO WANGZHUANG COAL MINE
Current assignee: Zibo Wang Zhuang Coal Mine Co., Ltd.
Priority date: 2010-01-25
Filing date: 2010-01-25
Publication date: 2010-06-30
Anticipated expiration: 2030-01-25
Also published as: CN101757974B

Abstract

The invention relates to a method for recovering refined coal from coal slime, in particular to a grading method for recovering the refined coal from the coal slime. The method has the technical key points that by using a spiral classifier and the principle that 'sedimentation velocity in the liquid is different due to different particle sizes and specific gravities' of solid particles, the method realizes the separation between relatively high ash component and relatively low ash component by gravity classification; and 25-35% of plus sieve low ash refined coal with larger particle size can be recovered from the relatively high ash component, and 30-40% of minus sieve high ash coal slime with smaller particle size can be removed from the relatively low ash component. Through twice classification, the aim of 'removing the relatively high ash component in the coal slime' can be achieved. The embodiment of the invention can be used for recovering the refined coal from the coal slime, thus achieving the aim of reducing the ash content of the refined coal and meeting the demand of the user.

Description

Staging reclaims the cleaned coal in the coal slime

Technical field

The present invention relates to from coal slime, reclaim the method for cleaned coal, particularly utilize staging to reclaim the method for cleaned coal in the coal slime.

Background technology

As shown in Figure 1, the original technological process of production in coal washery is: the raw coal of underground mining is poured raw-fuel feeder into tippler after mine car promotes, feed the raw coal belt after raw coal bolting by feeder, oversize enters the raw coal conveyer picker through artificial selection, the lump coal of selecting with crusher in crushing be transported to the raw coal ore storage bin after raw coal vibratory sieve undersize mixes; When coal washing was produced, raw coal fed belt by the feeder the raw coal ore storage bin under and is transported to jigging machine and sorts, and enters belt after middle coal of selecting and spoil mix and is transported to middle storehouse, colliery; The cleaned coal that jigging machine is selected enters the A vibratory sieve and sieves, undersize is squeezed into concentration tank with the A pump and is concentrated, concentrating overflow uses as recirculated water, concentrated underflow is squeezed into belt vacuum filter with pump and is filtered, filtering product enters underground north and south cleaned coal belt with A vibratory sieve oversize and mixes the back as head coal product, is transported to the product ore storage bin and sells through underground thing, last storehouse cleaned coal belt; In coal when producing, the middle coal in storehouse, middle colliery through in coal belt, underground north and south, underground thing, go up storehouse cleaned coal belt be transported to the product ore storage bin as in coal sell.Underground north and south, underground thing, go up storehouse cleaned coal belt both as the cleaned coal belt conveyor, again simultaneously as in the coal belt conveyor, so cleaned coal and middle coal can not be produced transmission simultaneously.

The problem that original technological process of production exists mainly contains: raw coal is through behind the jig concentration, and cleaned coal enters A bolting, and the coarse fraction product can be adjusted cleans ash by control jig concentration parameter and A vibratory sieve screen size on the sieve; The fine fraction product is then squeezed into the concentrated back of concentration tank underflow by the A pump and is entered filter filtration becoming filtration coal slime product under sieving, original technological process of production fine fraction filters coal slime product ash content and can not adjust, and original head coal product is to be gone up the coarse fraction product and filtered coal slime product mixing back by A vibratory sieve sieve to sell as cleaned coal, so original head coal product ash content is difficult to adjust.When market changes, the user requires less than 10% o'clock cleans ash, and original technological process of production can not guarantee that market sale is limited, has a strong impact on economic benefit of enterprises; Adjust cleans ash, the product that production production and marketing is satisfied the need becomes the task of top priority in mine for this reason.

Summary of the invention

The invention provides the technology that a kind of staging reclaims cleaned coal in the coal slime, purpose is by technological transformation, uses spiral classifier and high frequency shale shaker by proportion and how much stagings product to be carried out classification, removes high relatively grey component in the coal slime, reduces cleans ash; By reasonable coal blending, adjust cleans ash, adapt to the variation in market, reach the adjustable controlled purpose of head coal product.

The following technical scheme of the concrete employing of the present invention:

Staging reclaims the cleaned coal in the coal slime, comprise that raw coal isolates cleaned coal through jigging machine, cleaned coal is being isolated on the sieve coal slime under cleaned coal and the sieve behind the A vibrosieve, it is characterized in that, A vibratory sieve sieve coal slime is down squeezed into spiral classifier with pump, with two high frequency shale shaker screenings, the high frequency shale shaker oversize mixes the back with A vibratory sieve oversize at belt and is delivered to the head coal product ore storage bin as head coal product respectively for sand return and overflow after the spiral classifier classification; Squeezing into concentration tank with pump after the high frequency shale shaker undersize mixes concentrates, concentrating overflow uses as recirculated water, concentrate underflow and in concentration tank, store, on the central coal during storehouse, with pump squeeze into belt vacuum filter filter back and middle coal be mixed be delivered in the product of coal ore storage bin.

In the such scheme, because vacuum filter production is asynchronous with coal washing production, when the coal slime storage time was longer in the concentration tank, concentrating the underflow pipeline might stop up.

For this reason, preferred scheme is: concentrate underflow and squeeze into belt vacuum filter with pump, coal coal bunker during filtering product is delivered to belt.All the other are identical with such scheme.

When this scheme is had relatively high expectations to cleans ash as the user, can start vacuum filter with coal slime as head coal product and coal washing production synchronous operation; When the user requires when low cleans ash, can start filter with coal slime as in product of coal and coal washing production synchronous operation, concentrate the difficult obstruction of underflow pipeline.

Compare with existing technology, advantage of the present invention is: method of the present invention can remove high relatively grey component in the coal slime, reduces the ash content of cleaned coal, tool applicant test, and ash content can be low by about 2 ~ 5, improved product quality.

Description of drawings

Fig. 1 is the technological process of production figure of prior art.

The specific embodiment

Further describe the present invention below in conjunction with accompanying drawing.

Embodiment 1

A vibratory sieve sieve coal slime is down squeezed into spiral classifier with the A pump, and sand return and overflow are respectively through two high frequency shale shaker screenings after the spiral classifier classification, and oversize mixes the back with A vibratory sieve oversize at belt and is delivered to the head coal product ore storage bin as head coal product; Undersize mixes the back to be squeezed into concentration tank with pump and concentrates, and concentrates overflow and uses as recirculated water, concentrate underflow and in concentration tank, store, on the central coal during storehouse, with pump squeeze into belt vacuum filter filter back and middle coal be mixed be delivered in the product of coal ore storage bin.

Embodiment 2

A vibratory sieve sieve coal slime is down squeezed into spiral classifier with the A pump, and with two high frequency shale shaker screenings, oversize mixes the back with A vibratory sieve oversize at belt and is delivered to the head coal product ore storage bin as head coal product respectively for sand return and overflow after the spiral classifier classification; Squeeze into concentration tank with pump after undersize mixes and concentrate, concentrate overflow and use as recirculated water, concentrated underflow is squeezed into belt vacuum filter with pump and is filtered, and filtering product is delivered to middle coal coal bunker with belt.When this scheme is had relatively high expectations to cleans ash as the user, can start vacuum filter with coal slime as head coal product and coal washing production synchronous operation; When the user requires when low cleans ash, can start filter with coal slime as in product of coal and coal washing production synchronous operation, concentrate the difficult obstruction of underflow pipeline.

Claims

1. staging reclaims the cleaned coal in the coal slime, comprise that raw coal isolates cleaned coal through jigging, cleaned coal is being isolated on the sieve coal slime under cleaned coal and the sieve behind the A vibrosieve, it is characterized in that, sieve coal slime is down squeezed into spiral classifier with pump, with two high frequency shale shaker screenings, the high frequency shale shaker oversize mixes the back with A vibratory sieve oversize at belt and is delivered to the head coal product ore storage bin as head coal product respectively for sand return and overflow after the spiral classifier classification; Squeezing into concentration tank with pump after the high frequency shale shaker undersize mixes concentrates, concentrating overflow uses as recirculated water, concentrate underflow and in concentration tank, store, on the central coal during storehouse, with pump squeeze into belt vacuum filter filter back and middle coal be mixed be delivered in the product of coal ore storage bin.

2. staging according to claim 1 reclaims the cleaned coal in the coal slime, it is characterized in that, grader sand return and overflow use high frequency shale shaker to carry out the geometry sieve classification respectively, from classifier overflow, reclaim 25%～35% granularity than low ash extract coal on the shaker screen, from the grader sand return, remove dirty coal mud under 30%～40% the less sieve of granularity.

3. staging according to claim 1 reclaims the cleaned coal in the coal slime, it is characterized in that, concentrates underflow and squeezes into the belt vacuum filter filtration with pump, coal coal bunker during filtering product is squeezed into belt.

4. according to the cleaned coal in claim 1 or the 3 described stagings recovery coal slimes, it is characterized in that A vibratory sieve sieve is coal slime down:

The above productive rate of 100 orders is: 76-80; The following productive rate of 100 orders is: 20-24;

The above ash content of 100 orders is: 10-11; The following ash content of 100 orders is: 19-25.