CN102896036A - Three-section four-product heavy media coal preparation process - Google Patents

Abstract

The invention discloses a three-section four-product heavy media coal preparation process. A buffering tank is additionally arranged at the tail of a second section of a two-section heavy media coal preparation system, and a third-section whirlcone is additionally arranged behind the buffering tank. Qualified clean coal is firstly separated out under the rotational flow effect of suspension liquid after raw coal enters a first section of the whirlcone, and the rest of materials enter the second section of the whirlcone. Middle coal is separated out in the second section of the whirlcone, and then the rest of materials enter a third section of the whirlcone through the buffering tank. Electricity coal is separated out in the third section of the whirlcone, and then residual gangue with low calorific value is discharged through a bottom flowing port of the third section of the whirlcone. By means of the three-section four-product heavy media coal preparation process, the qualified clean coal and the middle coal in the traditional process can be obtained, the electricity coal with about 60% of ash content can be obtained, the ash content in the wasted gangue is improved to more than 80%, the calorific value is reduced below 800cal, and coal resources are saved maximumly.

Description

Three sections four-product heavy-media coal preparation processes

Technical field

The invention belongs to the coal preparation technology field.

Background technology

No matter traditional coal preparation technique is the jigging method or heavily is situated between method, except coal slime, two sections three products heavy-media coal preparation process flow processs of general employing, reelecting the Recognition Applied in Coal Preparation System that coal technique takes is two sections three products dense-medium separations, the cyclone of two sections three products dense-medium separations only has two sections, only produce three kinds of products: cleaned coal, middle coal and spoil.Cleans ash about 10%, midale coal ash about 40%, spoil ash content 70%.About about 2000 kilocalories/kilogram, such spoil is used for the generating burning to the caloric value of spoil greatly, and caloric value is a bit on the low side; If be used for the raw material of construction material, also contain 30% flammable body product, can't directly utilize.In order rationally to utilize limited coal resources, should with the further sorting of this part spoil, divide the spoil of electing electric product of coal (caloric value is 3000 kilocalories/kilogram) as and can directly utilizing processing building materials low carbon content.

Summary of the invention

The objective of the invention is on the basis of existing two sections three products heavy-media coal preparation process flow processs, to invent a kind of process the spoil of spoil being selected the relatively high electric product of coal of caloric value and can directly utilizing the low carbon content of processing building materials by the method.

The present invention provides a kind of three sections four-product dense-medium separation systems that are fit to this coal preparation technique simultaneously

For achieving the above object, the technical scheme that coal preparation technique of the present invention is taked is,

The first step: three sections four-product dense-medium separations of model system

Three sections four-product dense-medium separation system architectures are: the cyclone second segment afterbody in existing two sections three products dense-medium separation systems increases a baffle-box, the baffle-box back increases by one section cyclone again, be called the 3rd section of cyclone, feeding density in the 3rd section cyclone is 1.7g/cm ³About heavy-media suspension, feed pressure and be not less than 0.1MPa.

Second step: utilize three sections four-product dense-medium separation systems that establish to carry out coal separation, concrete method for separating is as follows:

(1) raw coal at first sub-elects qualified cleaned coal after entering the cyclone first paragraph under the cyclonic action of suspension, and leftover materials enter the cyclone second segment;

(2) sub-elect middle coal at the cyclone second segment, second segment sub-elects after the middle coal, and remaining material enters the 3rd section of cyclone through baffle-box again:

(3) sub-elect electric coal the 3rd section of cyclone, remaining lower calorific value spoil is discharged by the underflow opening of the 3rd section of cyclone.

The invention has the advantages that: by four-product heavy-media coal preparation process flow process, not only can obtain qualified cleaned coal and middle coal in the traditional handicraft, can also obtain the electric coal of ash content about 60%.This part electric calorific value of coal can be used for the Gangue Power Plant generating about 3000 kilocalories/kilogram, output is about 15% of spoil output in the legacy system.The ash content of discarded spoil is brought up to more than 80%, and caloric value drops to below the 800cal, not only saves to greatest extent coal resources, and the spoil of lower calorific value also is more prone in follow-up comprehensive utilization.

Description of drawings

1-3 further specifies three sections four-product heavy-media coal preparation process methods of the present invention with reference to the accompanying drawings.

Fig. 1 is process chart of the present invention;

Fig. 2 is the pressurized feeding image contact figure of system of the present invention;

Fig. 3 is the unpressurized feeding image contact figure of system of the present invention.

Among the figure: 1-cyclone first paragraph, 2-cyclone second segment, the 3rd section of 3-cyclone, 4-baffle-box

XF represents suspension, and YM represents raw coal, coal in the ZM representative, and JM represents cleaned coal, and GS represents spoil, and DM represents electric coal, and XFYM represents the mixture of suspension and raw coal

The specific embodiment:

Find out from Fig. 2,3, three sections dense-medium separation systems of the present invention comprise two sections cyclones, be respectively cyclone first paragraph 1 and cyclone second segment 2, increased a baffle-box 4 at cyclone second segment 2 afterbodys, baffle-box 4 back increase the 3rd section 3 of cyclone again, and feeding density in the 3rd section 3 of the cyclone is 1.7g/cm ³About heavy-media suspension XF, feed pressure and be not less than 0.1MPa.

As can be seen from Figure 1, sorting process of the present invention is: raw coal YM at first sub-elects qualified cleaned coal JM after entering cyclone first paragraph 1 under the cyclonic action of suspension XF, leftover materials enter cyclone second segment 2 and sub-elect middle coal ZM, and remaining material enters the 3rd section 3 of cyclone by baffle-box 4 again; Sub-elect electric coal DM for the 3rd section 3 at cyclone, remaining lower calorific value spoil GS is discharged by the underflow opening of the 3rd section 3 of cyclone.

Fig. 2 and Fig. 3 are respectively the pressurized feeding image contact figure of system of the present invention and the image contact figure of unpressurized feeding system; As can be seen from the figure, the difference of pressurized feeding system and unpressurized feeding system is enter material way, wherein the pressurized feeding system is that raw coal YM enters cyclone first paragraph 1 with suspension XF at different entrances, and the unpressurized feeding system to be raw coal YM and suspension XF mix forms raw coal slurry compositions XFYM and enter cyclone first paragraph 1.

Claims (1)

1. three sections four-product heavy-media coal preparation processes is characterized in that sorting process is as follows:

The first step: three sections four-product dense-medium separations of model system

Three sections four-product dense-medium separation system architectures are: the cyclone second segment afterbody two sections three products dense-medium separation systems increases a baffle-box, the baffle-box back increases by one section cyclone again, be called the 3rd section of cyclone, feeding density in the 3rd section of the cyclone is 1.7g/cm ³About heavy-media suspension, feed pressure and be not less than 0.1MPa;

Second step: utilize three sections four-product dense-medium separation systems that establish to carry out coal separation, concrete method for separating is as follows:

(1) raw coal at first sub-elects qualified cleaned coal after entering the cyclone first paragraph under the cyclonic action of suspension, and leftover materials enter the cyclone second segment;

(2) sub-elect middle coal at the cyclone second segment, second segment sub-elects after the middle coal, and remaining material enters the 3rd section of cyclone through baffle-box again:

(3) sub-elect electric coal the 3rd section of cyclone, remaining lower calorific value spoil is discharged by the underflow opening of the 3rd section of cyclone.

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