CN104089548A - Fan-shaped arrangement blast mining method - Google Patents
Fan-shaped arrangement blast mining method Download PDFInfo
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- CN104089548A CN104089548A CN201410276822.2A CN201410276822A CN104089548A CN 104089548 A CN104089548 A CN 104089548A CN 201410276822 A CN201410276822 A CN 201410276822A CN 104089548 A CN104089548 A CN 104089548A
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Abstract
The invention discloses a fan-shaped arrangement blast mining method. A blast hole is a medium-deep hole; each row of the blast holes and other rows of the blast holes are in fan-shaped arrangement; one of the blast holes of each row is filled with a conventional amount of gunpowder, and the adjacent blast holes are filled with the gunpowder, and the amount is smaller than the conventional amount; the gunpowder filling amount of one of the blast holes of each row is smaller than the conventional amount, and the gunpowder filling amounts of the adjacent blast holes are the conventional amounts. Meanwhile, by the use of a time-delay blasting method between the middle blast holes and the edge holes, the shortcomings that explosive energy is not used fully, large blocks are generated after the blasting is performed, and the number of stacks is large during salvo detonation are effectively overcome; the blasting effect of salvo is greatly enhanced, and the shoveling and loading efficiency of a shovel conveyer is improved; due to reduced gunpowder filling of orifices, the cost is greatly lowered.
Description
Technical field
The invention belongs to mining technique field, relate to a kind of blasting mining method.
Background technology
During the mining of mine sublevel caving method without sill pillar, in big gun hole, load the explosive blasting ore deposit that falls, then in bottom by ore recuperation.Medium-length hole blasting easily occurs that top ore bulk is many, and explosion is insufficient, is easy to the row of pushing away, outstanding top, and fan shaped medium length hole bottom is because big gun hole is too close, and after explosion, ore is crossed the problem of pulverizing.Mining area is along with the continuous maximization of winning equipment at present, and mining parameter constantly increases, and height of lift is increased to 15 meters by 10 meters, and drift interval is increased to 18 meters by 12 meters.Its parameter of mainly digging up mine is array pitch 2.2m, and every row's fan shaped medium length hole comprises 8 holes, the darkest hole 22m, and the most shallow hole 5m left and right, 55 °, lateral opening angle, at the bottom of hole, distance is 2.2-2.4m, aperture 76mm.After parameter increases, during explosion deep hole, the bulk on top increases thereupon, and even explosion is by the situation that often there will be the row of pushing away, outstanding top, bulk card to leak.If the row of pushing away, outstanding top, both had a strong impact on the rate of recovery, the waste explosive of ore, lose again a large amount of ore resource, also impact is joined miner and is done, and causes the quality fluctuation of extracted ore.And, abnormally dangerous when processing pushes away row, outstanding top, bring very large hidden danger to fireman's personal safety.How reducing the generation of even stopping the row of pushing away in medium-length hole blasting, outstanding top phenomenon, improve lump ore rate, is urgent need to solve the problem during underground mining is produced.
Summary of the invention
For overcoming the above problems, the invention provides a kind of fan-shaped blasting mining method of arranging.
Technical scheme: a kind of fan-shaped blasting mining method of arranging, big gun hole is medium-length hole, every artillery salvo hole and other artillery salvo hole are fan-shaped layout, one of them big gun hole dress convention amount medicine in every artillery salvo hole, the big gun hole being adjacent dress is less than the medicine of convention amount; One of them hole charge in every artillery salvo hole is less than convention amount, and the hole charge being adjacent is conventional charge amount.
When every artillery salvo hole is different, detonate, after grouping, press different time delayed ignition for every group.Every row has 8 big gun holes, numbering 1-8#, and wherein 3-6# hole adopts 2 sections of millisecond detonators to detonate, 1-2# and 7-8# hole adopt 4 sections of millisecond detonators to detonate or every row has 8 big gun holes, numbering 1-8#, wherein 3-6# hole adopts 4 sections of millisecond detonators to detonate, and 1-2# and 7-8# hole adopt 6 sections of millisecond detonators to detonate.The burst time in 3-6# hole and 1-2# and 7-8# hole is spaced apart 50-80 millisecond.
Beneficial effect: 1) adopt with round different time delaying blasting, the normally used same round detonating technique that once volleys while having changed down-hole bottom-column-free sectional caving stoping method fan shaped medium length hole explosion in the past, effectively having overcome volleys, and the middle explosive energy that detonates utilizes the shortcoming that after insufficient, explosion, bulk is many, the row of pushing away is many, greatly improve the demolition effect of the artillery salvo, improved the shovel dress efficiency of scraper.
2) in order to improve the lump ore granularity of ore, the lump ore rate index of ore is controlled in certain scope, in the fan shaped medium length hole explosion of down-hole, has promoted aperture fractional charge technology, to improve the comprehensive utilization ratio of ore.
3) according to the Structure of mine rock of ore, collapsing property, tax, deposit the feature of situation, use flexibly blasting technique, improved to greatest extent the demolition effect of ore.
Accompanying drawing explanation
Fig. 1 is explanation schematic diagram of the present invention,
1-2 section detonator in figure, 2-4 section detonator, 3-aperture emptying aperture section, 4-1# hole, 5-2# hole, 6-3# hole, 7-4# hole, 8-5# hole, 9-6# hole, 10-7# hole, 11-8# hole.
The specific embodiment
The difficult problem occurring in blasting process in order to solve traditional fan shaped medium length hole, through the abundant feasibility study of technical staff, has proposed in medium-length hole blasting middle and upper part, to adopt section gap time detonating technique, to reduce boulder yield.Concrete grammar is: adopt 2 sections of (or 4 sections) millisecond detonators to detonate in the 3-6# hole in the middle of 8 holes of same row, the 1-2# on both sides, 7-8#, 4 holes adopt 4 sections of (or 6 sections) millisecond detonators to detonate, and defer time is generally 50-80 millisecond left and right (length of defer time can be adjusted according to ore properties).By section gap delayed ignition, the forward and backward ore detonating plays the effect of secondary extrusion fragmentation in blasting process, make to disintegrate after the ore explosion on top more abundant, solved preferably the top explosion of big gun hole by the normal bulk producing, the generation of the row's of pushing away situation, lumpiness is more even, be easier to shovel and pretend industry, significantly reduced by two simultaneously and burst into this.
For the big gun pore size distribution of " intersection point " (being similar to the crosspoint of folding fan frame) that approaches fan shape than the part of comparatively dense, if full blast hole projectile filling, during explosion because the local explosive in aperture is too concentrated, after explosion, cause the ore of bore portions too to be pulverized, lump ore rate is on the low side, cannot meet the requirement of ore dressing plant to ore lump ore rate index, adopt fractional charge.Concrete grammar is: because the big gun hole density ratio in aperture is larger, in order to reduce the degree of packing in big gun hole, aperture, to improve the lump ore rate of bore portions, 1#, 3#, 5#, 7# hole adopts the powder charge of full hole, 2#, 4#, 6#, 8# hole adopts method (the reserved emptying aperture in 1-3 meter position, big gun aperture of few powder charge, form aperture emptying aperture section), minimizing due to explosive payload, the lumpiness of bottom ore is more even, lump ore rate obviously increases, after explosion, the lumpiness of aperture ore can reach ore dressing plant substantially to the requirement of ore lump ore rate index (lump ore rate index >=65%), greatly improved the utilization rate of ore.
To certain mining area I ore body 2700 horizontal 29-38 wear, the horizontal 56-63 of II ore body 2685 pierces into the pre-stage test work of charge explosion of having gone, and tests altogether 20 row's deep holes, test produces a desired effect.Test data is added up as following table:
From the analysis of statistical data of upper table, the comprehensive explosive specific charge of artillery salvo explosion is reduced to 450.2kg/ by the 490kg/ row before testing and arranges, and reduces by 8.1% left and right; Lump ore rate brings up to 66.05% by 65% before testing, and has improved 1.05%(lump ore rate plan target >=65%); Ore bulk is reduced to 14/row by 20 before testing/row, has reduced by 30% than in the past; Ore recovery ratio brings up to 85.4 by 84.3 before testing, and has improved 1.1%; The row of pushing away leads and is reduced to 5.6% by former 15%, has greatly improved ore removal and has joined ore deposit condition, and ore recovery rate is significantly improved.Adopt this ore deposit I-II ore body of the present invention wherein the benefit of a year be: the explosion artillery salvo 1391 row, use 681.6 tons of left and right of explosive, explosive use amount reduces by 8.1% left and right, the same period, extracted ore was 184.4 ten thousand tons, 1.68 ten thousand tons, ore, 29.4 yuan/ton of the ore mining costs of reclaiming more
1. save explosive cost:
681.6 * 8.1% * 5513 yuan/ton of explosive=30.44 ten thousand yuan
2. save detonator and primacord cost:
Ten thousand yuan of 1391 * 9 * 5.4 * 8.1%+646 * 92 * 1.37 * 8.1%=1.211
3. the ore wounds that reclaim are imitated more: ten thousand yuan of 1.68 * 29.4=49.39
More than add up to: ten thousand yuan of 30.44+1.2+49.39=81.04
4. lump ore rate improves 1.05%, for ore dressing plant provides qualified ore.
Adopt this method significantly to reduce fireman's labour intensity, reduced the potential safety hazard of fireman when processing pushes away row, outstanding top, guaranteed fireman's personal safety, improved labor productivity.On the one hand, the demolition effect of ore is obviously improved, the row of pushing away, outstanding top, bulk greatly reduce, the row of pushing away leads by former 15% and is reduced to 5.6%, boulder yield has reduced by 30% than in the past, explosive specific charge has reduced by 8.1%, and ore recovery rate has improved 1.1%, greatly improve ore removal and joined ore deposit condition, saved great amount of cost.On the other hand, owing to adopting aperture fractional charge technology, when saving explosive, the lump ore rate index of ore has also had raising, for ore dressing plant provides qualified ore.
Claims (6)
1. the fan-shaped blasting mining method of arranging, is characterized in that big gun hole is medium-length hole, and every artillery salvo hole and other artillery salvo hole are fan-shaped layout, one of them big gun hole dress convention amount medicine in every artillery salvo hole, and the big gun hole being adjacent dress is less than the medicine of convention amount; One of them hole charge in every artillery salvo hole is less than convention amount, and the hole charge being adjacent is conventional charge amount.
2. the fan-shaped blasting mining method of arranging as claimed in claim 1, is characterized in that when every artillery salvo hole is different detonating, and after grouping, every group detonates successively by different time.
3. the fan-shaped blasting mining method of arranging as claimed in claim 1, is characterized in that being less than the big gun hole of conventional dose, forms aperture, big gun hole emptying aperture section.
4. the fan-shaped blasting mining method of arranging as claimed in claim 2, is characterized in that every row has 8 big gun holes, numbering 1-8#, and wherein 3-6# hole adopts 2 sections of millisecond detonators to detonate, and 1-2# and 7-8# hole adopt 4 sections of millisecond detonators to detonate.
5. the fan-shaped blasting mining method of arranging as claimed in claim 2, is characterized in that every row has 8 big gun holes, numbering 1-8#, and wherein 3-6# hole adopts 4 sections of millisecond detonators to detonate, and 1-2# and 7-8# hole adopt 6 sections of millisecond detonators to detonate.
6. the fan-shaped blasting mining method of arranging as described in claim 4 or 5, is characterized in that the burst time in 3-6# hole and 1-2# and 7-8# hole is spaced apart 50-80 millisecond.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436990A (en) * | 2016-05-27 | 2017-12-05 | 南京梅山冶金发展有限公司 | A kind of uncompensated space blasting failure processing method |
| CN107525443A (en) * | 2016-06-20 | 2017-12-29 | 南京梅山冶金发展有限公司 | The explosion method of ignition of fan shaped medium length hole |
| CN113154973A (en) * | 2021-05-07 | 2021-07-23 | 中国华冶科工集团有限公司 | Mining blasting method |
| CN113847033A (en) * | 2021-10-29 | 2021-12-28 | 海南矿业股份有限公司 | Mining medium-length hole rock drilling and blasting method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436990A (en) * | 2016-05-27 | 2017-12-05 | 南京梅山冶金发展有限公司 | A kind of uncompensated space blasting failure processing method |
| CN107525443A (en) * | 2016-06-20 | 2017-12-29 | 南京梅山冶金发展有限公司 | The explosion method of ignition of fan shaped medium length hole |
| CN113154973A (en) * | 2021-05-07 | 2021-07-23 | 中国华冶科工集团有限公司 | Mining blasting method |
| CN113847033A (en) * | 2021-10-29 | 2021-12-28 | 海南矿业股份有限公司 | Mining medium-length hole rock drilling and blasting method |
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Application publication date: 20141008 |