CN102716808A - Flotation process for difficultly selected coal slime with high middle density substance content - Google Patents

Abstract

A kind of flotation process of refractory coal slime with high intermediate density content, including slurry adjustment of floating coal slurry, coarse selection of coal slime flotation after slurry adjustment, classification of coarse selection and clean coal, coarse coarse selection of clean coal after classification, and regrinding Re-selection, fine-grained coarse selection and clean coal selection are composed of five parts. The flotation equipment is used together with the corresponding concentration and classification equipment and coal grinding equipment to form a flotation equipment. Rough selection - rough selection of clean coal classification - coarse coarse selection of clean coal grinding, flotation - fine coarse selection of clean coal separate cleaning Choose craft. After a rough selection of the floating coal slime, most of the high-ash gangue minerals are removed, which reduces the adverse effects of the high-ash fine slime on the subsequent grinding and floating process of the coal slime. The dissociation of organisms and the further flotation recovery of coal slime after dissociation can solve the contradiction between the product quality and recovery rate of refractory coal slime with high intermediate density content. The process is simple, low investment, low power consumption, and low operating costs. Compared with the traditional sorting process, the sorting efficiency is high, the combustible body recovery rate is high, and the economic benefit is remarkable.

Description

A Flotation Process for Refractory Coal Slime with High Intermediate Density Content

technical field

The invention relates to a coal slime separation process, in particular to a flotation process suitable for refractory coal slime with high intermediate density content, and belongs to the technical field of mineral separation.

Background technique

When the weight of materials with a density between 1.4g/cm ³ and 1.8g/cm ³ in the slime accounts for more than 30% of the total material, it can be called high intermediate density slime. When the content of intermediate density is high, there are many particles of coal and gangue, and the coal and gangue cannot be effectively separated by flotation, resulting in coal loss in tailing coal, or gangue entrained in clean coal; when the content of intermediate density When it is low, the content of pure coal and pure gangue particles is high, and the coal and gangue can be effectively separated by simple flotation. With the improvement of my country's coal mining mechanization, the deterioration of resource geological conditions, the large-scale construction of coal preparation plants and the wide application of dense medium cyclones, the proportion of coal slime has increased sharply, especially when the content of -0.074mm fine-grained coal slime is high 1. When the intermediate density of coarse-grained coal slime is high and the ash content is high, the coal slime is easy to float and difficult to select, and the selectivity is poor. In order to ensure the ash content of clean coal, the coal preparation plant often controls the dosage of flotation agents, roughing and re-selecting clean coal to ensure that the ash content of clean coal is qualified, so that the intermediate density in the coal slime finally enters the flotation tailings. In addition, the fine-grained coal slime cannot be effectively sorted, which wastes resources and reduces the economic benefits of the coal preparation plant. This is a great waste for my country's high-quality and scarce fertilizer coking coal resources. With the continuous reduction of high-quality scarce fertile coking coal resource reserves, as a non-renewable resource, it is particularly urgent to efficiently sort the refractory coal slime with high intermediate density content.

The conventional flotation process is to send the flotation feed material to the flotation column (or flotation machine) after pulping treatment, and the flotation column (or flotation machine) to separate clean coal and tailings, and enter the respective Subsequent product processing operations. This process is mainly used for the separation of conventional easy-to-select coal slime, and has been used in my country for many years, and has accumulated rich experience. It is currently the most widely used flotation process for coal slime flotation in my country. For the separation of high-intermediate-density refractory coal slime, the process generally has the defects of low product recovery and production efficiency, which seriously restricts the quality of the final clean coal product. The development of key technologies for efficient separation of high-intermediate density and difficult-to-separate coal slimes has become a problem that needs to be solved urgently in the process of efficient and clean utilization of coal resources.

Contents of the invention

Technical problem: the object of the present invention is to overcome the deficiencies in the prior art, and provide a low-cost, simple process, low investment, high sorting efficiency, significant economic benefits, and a process for sorting refractory coal slime with high intermediate density content method.

Technical solution: The flotation process of refractory coal slime with high intermediate density content of the present invention includes using I slurry mixing equipment to adjust the slurry of the floating coal slurry added with I flotation agent; sending the adjusted I slurry to Put into I flotation equipment for roughing operation to obtain I flotation clean coal and I flotation tailing coal; also include the following steps:

a. Send the I flotation clean coal from the I flotation equipment to the concentration equipment for concentration treatment to obtain underflow products and overflow products;

b. The underflow product is sent to the classification equipment for classification, and the above-sieve product and the under-sieve product are obtained;

c. The screened product is sent to the coal grinding equipment for grinding to obtain the ground product;

d. Send the milled product added with II flotation agent to II pulping equipment for pulping to obtain the well-blended II coal slime water; 

e. Send the II coal slime water to the II flotation equipment for separation to obtain II flotation clean coal and II flotation tailing coal;

f. The overflow product and the under-screen product are sent to the III slurry mixing equipment, and the III flotation agent is added for slurry adjustment to obtain the well adjusted III coal slime water;

g. The III coal slime water is sent to the III flotation equipment for separation, and the III flotation clean coal and the III flotation tailing coal are obtained.

The classification equipment adopts a classification cyclone or a screen cyclone with a classification particle size of 0.125mm or 0.15mm; when the ash content of the tailings of the II flotation coal sorted by the II flotation equipment is higher than 40%, it is used as the final tailing coal product; when the ash content of the tailing coal of II flotation sorted by the II flotation equipment is lower than 40%, it is returned to the I slurry conditioning equipment for slurry conditioning and separation again.

Beneficial effects: the present invention is a practical technology based on the separation of refractory coal slime, and is a technological process for efficiently sorting refractory coal slime with high intermediate density content. In the present invention, firstly, the flotation technology is used to roughen the difficult-to-separate coal slime with high intermediate density content, and then the obtained coarsely-separated coarse-cleaned coal is concentrated and classified, and the coarse-grained coarse-cleaned coal is re-grinded and re-selected after classification, and the fine-grained coarse-grained coal The clean coal is selected separately, so as to realize the efficient separation of refractory coal slime with high intermediate density content. After a rough selection of the floating coal slime, most of the high-ash gangue minerals are removed, which reduces the adverse effects of the high-ash fine slime on the subsequent grinding and floating process of the coal slime. The dissociation of organisms and the further flotation recovery of the dissociated coal slime solve the contradiction between the product quality and recovery rate of the refractory coal slime with high intermediate density content. The invention has the advantages of simple process, low investment, low power consumption and low operating cost. Compared with the traditional sorting process, the sorting efficiency is high and the economic benefit is remarkable.

Description of drawings

Fig. 1 is a block diagram of the separation process of the present invention.

Fig. 2 is a system diagram of the separation process equipment of the present invention.

In the picture: A—Ⅰ slurry mixing equipment, B—Ⅰ flotation equipment, C—concentrating equipment, D—classification equipment, E—coal grinding equipment, F—Ⅱ slurry mixing equipment, G—Ⅱ flotation equipment, H—Ⅲ Slurry equipment, I-III flotation equipment.

Detailed ways

An implementation of the present invention will be further described below in conjunction with accompanying drawing:

The flotation process of the refractory coal slime with high intermediate density content of the present invention adopts slurry adjustment equipment, flotation equipment B, concentration equipment C, classification equipment D, and coal grinding equipment E, and its process steps are as follows:

a. The floating coal slime 2 added with I flotation agent 1 is sent to I slurry conditioning equipment A, and the floating coal slurry 2 added with I flotation agent 1 is conditioned through I slurry conditioning equipment A to obtain a well-conditioned slurry slime water 3;

b. Slurry prepared I coal slime water 3 is sent to I flotation equipment B for roughing operation to obtain I flotation clean coal 4 and I flotation tailing coal 5;

c. Send the I flotation clean coal 4 floated by the I flotation equipment B to the concentration equipment C for concentration treatment, and obtain the underflow product 6 and the overflow product 7;

d. The underflow product 6 is sent to the classification equipment D for classification to obtain the oversize product 8 and the undersize product 9; the classification equipment adopts a classification cyclone or a screen cyclone with a classification particle size of 0.125mm or 0.15mm.

e. The sieved product 8 is sent to the coal grinding equipment E for grinding, and the ground product 10 is obtained;

f. Send the milled product 10 added with the II flotation agent 11 to the II slurry mixing equipment F for slurry adjustment to obtain the well adjusted II coal slime water 12;

g. Send the II coal slime water 12 to the II flotation equipment G for separation to obtain II flotation clean coal 13 and II flotation tailing coal 14;

h. The overflow product 7 and the under-screen product 9 are sent to the III slurry mixing equipment H, and the III flotation agent 15 is added for stirring and slurry mixing to obtain the well-conditioned III coal slime water 16;

i． Sending III coal slime water 16 into III flotation equipment I for sorting to obtain III flotation clean coal 17 and III flotation tailing coal 18;

When the ash content of II flotation tailing coal 14 produced by the flotation of II flotation equipment G is higher than 40%, it will be used as the final tailing coal product;

When the ash content of II flotation tailings 14 from the flotation of II flotation equipment G is lower than 40%, return to I slurry conditioning equipment A for slurry conditioning and separation again.

Claims (3)

1. the floatation process of density thing content difficult separation coal mud between a senior middle school comprises with I size mixing equipment (A) the float coal mud (2) of going into that adds I floating agent (1) is sized mixing; The I black water (3) of sizing mixing is sent into I floatation equipment (B) roughly select operation, obtain I floatation clean coal (4) and I floating tail-coal (5); It is characterized in that, also comprise the steps:

A. the I floatation clean coal (4) that I floatation equipment (B) is floatingly selected is sent into concentrator (C) and is carried out concentration, obtains underflow product (6) and overflow product (7);

B. underflow product (6) is sent into classifying equipoment (D) classification, obtain sieving product (8) and undersized product (9);

C. will sieve product (8) and send into coal-grinding equipment (E) ore grinding, obtain grinding back product (10);

D. product (10) behind the mill that adds II floating agent (11) is sent into II size mixing equipment (F) and size mixing the II black water (12) that obtains sizing mixing;

E. II black water (12) is sent into II floatation equipment (G) and carry out sorting, obtain II floatation clean coal (13) and II floating tail-coal (14);

F. overflow product (7) and undersized product (9) are sent to III size mixing equipment (H), add III floating agent (15) and size mixing the III black water (16) that obtains sizing mixing;

G. III black water (16) is sent into III floatation equipment (I) and carry out sorting, obtain III floatation clean coal (17) and III floating tail-coal (18).

2. the floatation process of density thing content difficult separation coal mud between a kind of senior middle school according to claim 1 is characterized in that: it is classifying cyclone or the screen cloth cyclone of 0.125mm or 0.15mm that described classifying equipoment adopts partition size.

3. the floatation process of density thing content difficult separation coal mud between a kind of senior middle school according to claim 1; It is characterized in that: II floating tail-coal (14) ash content that said II floatation equipment (G) sub-elects is higher than at 40% o'clock; As final tail coal product; The ash content of the II floating tail-coal (14) that said II floatation equipment (G) sub-elects is lower than at 40% o'clock, returns I size mixing equipment (A) sorting of sizing mixing once more.

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