CN102357428A - Novel floatation process capable of ensuring upper limit of fed material granularity and improving dehydration effect of foam product - Google Patents

Abstract

The invention discloses a novel floatation process capable of ensuring an upper limit of the fed material granularity and improving a dehydration effect of a foam product. The novel process comprises the following steps: sieving cleaned coal magnetic separator tailings with a vibration arc screen of which the screen cut is 0.5mm to incept coarse particles; allowing backwater to enter a floatation machine and sorting to obtain a low ash foam product and a high ash foam product; allowing the high ash foam product to enter a waste coal slime treatment system, and concentrating and dehydrating to obtain a coal slime product for selling; and doping the coarse particles into the low ash foam product and oversize products of the vibration arc screen and feeding into a centrifugal dehydrator and dehydrating, and doping commercial cleaned coal into the dehydration product. The novel floatation process can ensure the upper limit of the fed material granularity of floatation, and improve floatation foam product yield and ash content of waste coal, a capillary structure of a dehydration filter cake of the foam product, and the proportion of the particle grade of less than 0.045mm is adjusted, so that treatment capacity of dehydration equipment can be improved and moisture of the dehydration product is reduced.

Description

Guarantee the material size upper limit, improve the new flotation technique of foam product dehydrating effect

Technical field

The present invention relates to a kind of novel coal preparation technique, specifically a kind of new flotation technique of guaranteeing the material size upper limit, improving the foam product dehydrating effect.

Background technology

Wet coal preparation factory accounts for more than 95% of China coal preparation plant Design Treatment ability, has data report selected amount of China's raw coal in 2010 to reach 16.5 hundred million tons, and wherein the selected amount of wet coal preparation factory accounts for 15.7 hundred million tons.Flotation is the sorting process that present optimum break is the most effective less than the 0.5mm coal slime, technology is the most ripe, is the particularly requisite operation of wet method coking coal coal preparation plant of wet coal preparation factory.Not only can reclaim quality fine coal in a large number through flotation, and be the most important basis that wet coal preparation factory realizes wash water closed cycle, water for industrial use zero-emission.

Be limited to 0.5 (0.4) mm on the coal slime flotation material size; Because the various reasons of flotation operation principle and screening installation; " coarse grain " of granularity＞0.5 (0.4) mm very easily is lost in flotation operation in the tail coal, reduces foam product productive rate and tail coal ash content, causes the waste of precious resources.Because the foam product granularity is thinner, and particularly wherein the amount of accounting for of granularity＜0.045mm is bigger, have a strong impact on the effect of foam product subsequent job dehydration again on the other hand.

Summary of the invention

The present invention is directed to wet coal preparation factory particularly wet method coking coal coal preparation plant ubiquitous flotation froth product productive rate is low, the high phenomenon of choosing back dehydrating prods moisture because of the ultra flotation granularity upper limit in a large number causes, a kind of new flotation technique of guaranteeing the material size upper limit, improving the foam product dehydrating effect is provided.

Realize that the technical scheme that the foregoing invention purpose adopts is: a kind of new flotation technique of guaranteeing the material size upper limit, improving the foam product dehydrating effect, this new technology is carried out according to following steps:

1. cleaned coal magnetic separator mine tailing uses the sieve seam to cut slightly as the vibration sieve bend of 0.5mm; Backwater gets into flotation device and carries out sorting, and sorting draws low-ash foam product and high-ash tail coal product;

2. high-ash tail coal product gets into tail coal muddy water treatment system, after concentrating, dewatering as the coal slime production marketing;

3. low-ash foam product and vibration sieve bend oversize are mixed thick back and are got into the centrifugal dehydrator dehydration, and dehydration product mixes the commodity cleaned coal.

Compared with prior art; The disclosed new flotation technique of the present invention is guaranteed the floatation feed granularity upper limit, can be improved flotation froth product productive rate and tail coal ash content; The ratio of foam product dewatered cake capillary structure, adjustment＜0.045mm grade be can improve again, thereby dehydration equipment disposal ability, reduction dehydration product moisture improved.

Description of drawings

Fig. 1 is a process chart of the present invention.

Fig. 2 is several quality flow charts of embodiment.

Alphabetical implication among the figure is respectively: γ: productive rate, %; T: output, t/h; Q: flow, m ³/ h; A: ash content, %; Q: concentration, g/L.

The specific embodiment

Below in conjunction with accompanying drawing and embodiment the present invention is elaborated.

The present invention is disclosed to be that a kind of wet coal preparation factory guarantees the floatation feed granularity upper limit, improves flotation froth product productive rate and tail coal ash content, improves the new technology of choosing back foam product dehydrating effect.

The step of this new technology is:

1. cleaned coal magnetic separator mine tailing uses the sieve seam to cut slightly as the vibration sieve bend of 0.5mm; Cleaned coal magnetic separator mine tailing cuts slightly through vibration sieve bend earlier before getting into the flotation device sorting; Be about to greater than the floatation feed granularity upper limit, major part obtain sorting in gravity preparation or sink float link, " coarse grain " that ash content is lower held back, stop coarse grain coal slime (referring to surpass the coarse grain of the floatation feed granularity upper limit) and be lost in the tail coal.The backwater of vibration sieve bend gets into flotation device and carries out sorting, and sorting draws low-ash foam product and high-ash tail coal product;

2. high-ash tail coal product gets into tail coal muddy water treatment system, after concentrating, dewatering as the coal slime production marketing;

3. low-ash foam product and vibration sieve bend oversize (being the coarse grain after 1. step is held back) are mixed thick back and are got into the centrifugal dehydrator dehydration, and dehydration product mixes the commodity cleaned coal.The filtrating of dewatering operation (centrifugate) gets into subsequent job.Mix thick coarse grain after being about to foam product and holding back and mix, the filter cake capillary structure in the time of can improving the foam product dehydration reduces filter cake moisture and also improves the dehydration equipment disposal ability, plays the raising flotation and selects the double action of afterproduct dehydrating effect.

In conjunction with accompanying drawing 2, implement this new technology as embodiment with Wuhai City, Inner Mongol coal preparation plant, the present invention is explained.

Wuhai City, Inner Mongol coal preparation plant is that year disposal ability is the large-scale wet method coking coal coal preparation plant of 3.0Mt (568t/h), and go into operation in July, 2009 smoothly, implements to have obtained after this new technology the good result of expection.

There are the amount of accounting for 13.91%, ash content to be merely granularity＞0.5mm of 8.36% " coarse grain " in the cleaned coal magnetic separator mine tailing; These " coarse grain " very easily are lost in the tail coal as getting into flotation operation; After vibration sieve bend " cuts thick "; Granularity＞0.5mm " coarse grain " is merely 0.21% in the backwater (flotation device pan feeding), and apportionment ratio reaches 98.63%; Floatation feed ash content 20.84% obtains ash content up to 57.43% tail coal after flotation, the amount of accounting for of granularity＞0.5mm in the tail coal (accounting for pan feeding) is merely 0.34%; Foam product obtains after dewatering that ash content is 10.88%, the commodity cleaned coal of moisture 17.00%.

Above-mentioned industrialness data show that patent of the present invention is to have reached the new technology of guaranteeing the floatation feed granularity upper limit, raising flotation froth product productive rate and tail coal ash content, improving choosing back foam product dehydrating effect really.

Claims (1)

1. the new flotation technique guaranteeing the material size upper limit, improve the foam product dehydrating effect is characterized in that, this new technology is carried out according to following steps:

1. cleaned coal magnetic separator mine tailing uses the sieve seam to cut slightly as the vibration sieve bend of 0.5mm; Backwater gets into flotation device and carries out sorting, and sorting draws low-ash foam product and high-ash tail coal product;

2. high-ash tail coal product gets into tail coal muddy water treatment system, after concentrating, dewatering as the coal slime production marketing;

3. low-ash foam product and vibration sieve bend oversize are mixed thick back and are got into the centrifugal dehydrator dehydration, and dehydration product mixes the commodity cleaned coal.

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