CN106622672A

CN106622672A - Float fine coal cell distribution treatment technique

Info

Publication number: CN106622672A
Application number: CN201710101285.1A
Authority: CN
Inventors: 王海楠; 朱宏政; 朱金波; 王路路; 王响响; 李垚鑫; 徐文玉
Original assignee: Anhui University of Science and Technology
Current assignee: Anhui University of Science and Technology
Priority date: 2017-02-24
Filing date: 2017-02-24
Publication date: 2017-05-10

Abstract

The invention discloses a float fine coal cell distribution treatment technique. The float fine coal cell distribution treatment technique comprises the following steps that coal to be treated is subjected to primary flotation operation; the ash content of fine coal of flotation cells of a flotation machine of primary flotation operation is detected; the fine coal with the low ash content is directly conveyed to filter dehydration equipment through the corresponding flotation cells and subjected to dehydration, a fine coal product is obtained, and the fine coal with the high ash content is subjected to secondary flotation operation; and the fine coal which is separated through secondary flotation operation enters a fine coal filter press and is subjected to dehydration, and another fine coal product is obtained. According to the float fine coal cell distribution treatment technique, the problem that in the traditional technique, ash carrying is caused due to the fact that primary flotation low-ash fine coal is subjected to secondary flotation concentration is effectively avoided, the fine coal productive rate is effectively increased, the ash content of fine coal is decreased, and chemical consumption is reduced.

Description

A kind of floatation clean coal point groove handling process

Technical field

The invention belongs to flotation technology field, and in particular to a kind of floatation clean coal point groove handling process.

Background technology

In recent years, due to the increasing and the development of mechanical coal mining technology of coal mining degree, characteristics of coal slime is constantly disliked Change, and market is higher to product quality requirement, traditional coal slime floating process is increasingly unsatisfactory for existing requirement, therefore improves biography System floatation process is extremely urgent.

Traditional coal slime flotation process is that floatation feed is sent into flotation device, and by flotation device cleaned coal and tail are sub-elected Coal, subsequently into respective subsequent processing operations.The floatation process is simple to operate, and disposal ability is big, with low cost, but is answering There are problems that cleans ash height, reagent consumption with during.In recent years, domestic coal preparation plant prevalence de slime flotation technique and Secondary flotation technique.De slime flotation technology process flow process be before ore pulp enters and floats using the desliming device such as desliming pond, desliming screen will- The height ash thin mud of 0.03mm is removed in advance, and rest materials enter flotation operation, and the technique reduces flotation operation in application process Operating pressure, reduce cleans ash, reduce reagent consumption, but it is excessive to there is desliming device floor space, production cost is high The shortcomings of；Secondary flotation technology process flow process is to carry out recleaning to a floatation clean coal after a flotation in ore pulp, The technique effectively reduces cleans ash, improves quality of cleaned coal, but has that clean coal yield is too low, secondary flotation work operations pressure Excessive the problems such as.Therefore, a kind of raising clean coal yield how is developed, cleans ash is reduced and is reduced the floatation process of production cost Become those skilled in the art's technical barrier urgently to be resolved hurrily.

The content of the invention

For disadvantages mentioned above, the present invention proposes a kind of floatation clean coal point groove handling process.

The present invention proposes a kind of floatation clean coal point groove handling process, comprises the steps：

S1, pending coal is delivered to a flotation operation；

The cleaned coal that S2, each flotation cell to a flotation operation flotation device are sub-elected carries out respectively ash content detection；

S3, according to the ash content testing result of S2, the low cleaned coal of ash content is directly transported into filter dewatering equipment by the flotation cell Dehydration forms head coal product, and the high cleaned coal of ash content is transported into secondary flotation operation by its respective flotation cell；

S4, the cleaned coal that secondary flotation operation is sub-elected is transported to clean coal pressur filter carries out processed, obtain floatation clean coal Product.

Preferably, ash content detection is carried out to the cleaned coal of each flotation cell using coal slurry ash content on-line detector in S2.

Preferably, the low cleaned coal of ash content is directly transported into centrifugal dehydrator dehydration, centrifugal dehydration by the flotation cell in S3 Machine filter cake directly forms head coal product, and filtrate enters secondary flotation operation.

Preferably, the clean coal pressur filter in S4 is fast opening pressure filter.

The beneficial effects of the present invention is：

(1) in the present invention, due to floatation feed, advanced first flotation cell is sorted in flotation device, cleaned coal emersion；Tail coal enters Enter the sorting of the second flotation cell, cleaned coal emersion, tail coal is sorted into the 3rd flotation cell ..., the like, until last is floating Groove tail coal is selected to discharge as a floating tail-coal, each flotation cell cleans ash becomes larger.Using coal slurry ash content on-line checking Instrument detects to each flotation cell cleans ash, and the cleaned coal for meeting head coal product ash content standard is directly entered centrifugal dehydrator and takes off Water forms head coal product, and the cleaned coal for not meeting head coal product ash content standard enters secondary flotation operation, it is to avoid the low ash of a flotation Cleaned coal enters secondary flotation operation gravity treatment back of the body ash, improves clean coal yield, reduces cleans ash, reduces the work of secondary flotation operation Pressure.

(2) in the present invention, the low ash extract coal product that a flotation is sub-elected enters centrifugal dehydrator processed, secondary floating The head coal product that choosing is sub-elected is due to the higher entrance fast opening pressure filter processed of moisture, it is to avoid different head coal products enter same One dewatering operation, improves dewatering efficiency.

(3) in the present invention, a floatation clean coal processes the filtrate for producing into centrifugal dehydrator and enters secondary flotation, it is to avoid The loss of cleaned coal.

Description of the drawings

Fig. 1：A kind of floatation clean coal proposed by the present invention point groove processing technological flow figure.

Specific embodiment

Fig. 1 is a kind of floatation clean coal proposed by the present invention point groove processing technological flow figure.

Technical scheme is specifically described below by specific embodiment.Using four trough floatation machines, it is desirable to essence Ash content of coal index is less than 10%.

Embodiment 1

S1, pending coal is delivered to a flotation operation；

S2, ash content detection is carried out respectively to the cleaned coal that four flotation cells of a flotation operation are sub-elected, its ash content index is shown in Table 1；

The each groove ash content index/% of table 1 embodiment, 1 flotation

	One groove cleaned coal	Two groove cleaned coal	Three groove cleaned coal	Four groove cleaned coal
					Ash content/%	5.60	6.92	8.64	9.81

S3, according to the ash content testing result of S2, four flotation cell cleans ash are below 10%, meet head coal product ash content Require, being directly transported to centrifugal dehydrator carries out processed, and filter cake forms head coal product, and filtrate enters secondary flotation operation；

Embodiment 2

S1, pending coal is delivered to a flotation operation；

S2, ash content detection is carried out respectively to the cleaned coal that four flotation cells of a flotation operation are sub-elected, its ash content index is shown in Table 2；

The each groove ash content index/% of table 2 embodiment, 2 flotation

	One groove cleaned coal	Two groove cleaned coal	Three groove cleaned coal	Four groove cleaned coal
					Ash content/%	7.38	8.77	10.44	13.27

S3, according to the ash content testing result of S2, a groove, two groove cleans ash are below 10%, meet head coal product ash content Require, being directly transported to centrifugal dehydrator carries out processed, filter cake forms head coal product, filtrate enters secondary flotation operation, three Groove, four groove cleans ash are above 10%, do not meet head coal product ash requirements, are transported to secondary flotation operation；

Embodiment 3

S1, pending coal is delivered to a flotation operation；

S2, ash content detection is carried out respectively to the cleaned coal that four flotation cells of a flotation operation are sub-elected, its ash content index is shown in Table 3；

The each groove ash content index/% of table 3 embodiment, 3 flotation

	One groove cleaned coal	Two groove cleaned coal	Three groove cleaned coal	Four groove cleaned coal
					Ash content/%	10.12	11.28	12.56	14.11

S3, according to the ash content testing result of S2, four flotation cell cleans ash are above 10%, do not meet head coal product ash Divide and require, be transported to secondary flotation operation；

Above-described embodiment is only the present invention preferably specific embodiment, but protection scope of the present invention is not limited to This, various modifications or equivalent that technology according to the present invention scheme is made all should fall within the scope of protection of the present invention.

Claims

1. a kind of floatation clean coal divides groove handling process, it is characterised in that comprise the steps：

S1, pending coal is delivered to a flotation operation；

S3, according to the ash content testing result of S2, the low cleaned coal of ash content is directly transported into filter dewatering equipment dehydration by the flotation cell Head coal product is formed, the high cleaned coal of ash content is transported into secondary flotation operation by its respective flotation cell；

2. a kind of floatation clean coal according to claim 1 divides groove handling process, it is characterised in that using coal slurry ash in S2 On-line detector is divided to carry out ash content detection to the cleaned coal of each flotation cell.

3. a kind of floatation clean coal according to claim 1 divides groove handling process, it is characterised in that in S3 that ash content is low Cleaned coal is directly transported to centrifugal dehydrator dehydration by the flotation cell, and centrifugal dehydrator filter cake directly forms head coal product, and filtrate enters Secondary flotation operation.

4. a kind of floatation clean coal according to claim 1 divides groove handling process, it is characterised in that the cleaned coal press filtration in S4 Machine is fast opening pressure filter.