CN103362532A

CN103362532A - Method for preparing active-carbon-containing colloid gas foam for preventing gas emission in gob

Info

Publication number: CN103362532A
Application number: CN2013102690153A
Authority: CN
Inventors: 秦波涛; 张雷林; 鲁义; 申红敏
Original assignee: China University of Mining and Technology CUMT
Current assignee: China University of Mining and Technology CUMT
Priority date: 2013-06-28
Filing date: 2013-06-28
Publication date: 2013-10-23
Anticipated expiration: 2033-06-28
Also published as: CN103362532B

Abstract

Active-carbon-containing colloid gas foam for preventing gas emission in a gob is provided, wherein active carbon powder is dispersed into water and is added with certain amount of thickener to prepare an active-carbon-containing thick solution at a certain concentration, and small amount of cross linking agent and foaming agent are added into the solution and is physically and mechanically stirred and foamed under the action of air to prepare the active-carbon-containing colloid gas foam. After the colloid gas foam is injected into the gob through a slip casting pipeline of a mine, a large area of float coal in the gob can be covered and the coal crack can be blocked, the active carbon is used to fully adsorb the free gas in the gob, and meanwhile, a film-shaped colloid covering material like cloth is formed on the surface of the coal to achieve the purpose of long-lasting effective inhibition of emission of the coal gas. The effect of the active-carbon-containing colloid gas foam on preventing gas emission in the gob is remarkable, the cost is low, and the prospect of application is wide.

Description

Be used for the colloidal foam preparation method who contains active carbon that the control goaf gas is gushed out

Technical field

The present invention relates to a kind of colloidal foam preparation method who contains active carbon, be particularly useful for wrapping up goaf float coal, shutoff coal body crack, absorption goaf free gas and the membranaceous colloidal foam preparation method who prevents the similar cloth of Gas.

Background technology

Mine gas is one of Major Natural Disasters of China's coal-mine exploitation.In recent years, along with the high speed development of mining technique equipment, China has emerged the intensive mine of large quantities of high-yield and high-efficiencies take comprehensive mechanical coal mining as feature.Because mining rate is large, the concentration of production, fltting speed are fast, causes the goaf to leave over residual coal and increases, float coal goes out a large amount of gas at goaf drainage.When a large amount of gas is accumulated in the goaf, often leaked out and bring work plane into and cause Air return corner even return airway gas exceeding limit and affect production.At present, the technical measures that the control goaf gas of commonly using is both at home and abroad gushed out mainly contain interim damp sheet, pump drainage blower fan are set, increase air quantity, high-order horizontal drilling and goaf gas extraction etc.These methods are effective to low gaseous mine or the little mine of output, but along with mine to the depths digging, gas bearing capacity increases gradually, low gaseous mine changes high gas or projecting mine into, the low yield mine is integrated also can change the high-yield and high-efficiency mine into, and this moment just can not effective solution Air return corner gas exceeding limit problem by above-mentioned method.Simultaneously because damp sheet is positioned at the edge, goaf, the spoil that the goaf falls very easily destroys damp sheet, causes the damp sheet increase of leaking out; Setting up the pump drainage blower fan need to increase cost, and affects the limited usable floor area in tunnel; Unlimited increase air quantity also is impossible; High-order horizontal drilling and goaf gas extraction ubiquity construction works amount are large, and the extraction time is long, and anxiety is taken in extraction, the problems such as disposable input and operating cost height.Therefore, to gush out be a difficult problem of domestic and international extensive concern to the control goaf gas.

Gush out in order to prevent and treat goaf gas, the present invention is intended to seek a kind of free gas to be had adsorption capacity, compactness is strong, cementing properties is good membranaceous plugging material, research and develop out the colloidal foam that contains active carbon of a kind of quick, whole parcel goaf float coal, with these technical measures that replace existing control goaf gas commonly used to gush out, thereby suppress goaf float coal Gas, prevent and stop gas and pour into upper corner and cause the gas exceeding limit phenomenon, realized purpose of the present invention.

Summary of the invention

Technical problem: the objective of the invention is for the problem that exists in the prior art, provide a kind of can be on a large scale, uniform fold goaf float coal and shutoff coal body crack, and at the membranaceous colloid overburden of the surface-crosslinked formation of coal body, can adsorb the goaf free gas and continue the permanent colloidal foam preparation method who contains active carbon who suppresses Gas.

Technical scheme: of the present invention for the colloidal foam preparation method who contains active carbon that gushes out of control goaf gas, comprise the steps:

Step 1: with particle diameter less than 500 microns wood activated charcoal powder, xanthans adhesion agent and water in mass ratio for 1:0.03:10 prepares, stir, make the multiviscosisty solution that contains active carbon;

Step 2: add simultaneously silicate of soda and dodecyl benzyl dimethyl ammonium chloride in containing the multiviscosisty solution of active carbon, silicate of soda, dodecyl benzyl dimethyl ammonium chloride and multiviscosisty solution are 3:4:1000 in mass ratio, preparation, and the formation mixed solution stirs;

Step 3: continue to introduce air in mixed solution, fully stirring, foaming form the colloidal foam that contains active carbon.

The volume of air that continues to introduce in the described mixed solution is 10～30 times of water volume.

Beneficial effect: of the present invention for the colloidal foam that contains active carbon gushed out of control goaf gas, by in water, adding activated carbon powder, adhesion agent, crosslinking agent and blowing agent, and under the effect of air, stir the multi-phase complex mixed system that foaming forms with physical mechanical.Mixed solution is by the colloidal foam that contains active carbon of a large amount of uniform and smooth of rear formation that foam, and volume increases considerably.After the mine grouting pipeline is delivered to the goaf with it, can pile up in the goaf large tracts of land, can both cover and shutoff low, eminence float coal.Stop injection after forming the tight colloidal foam of one deck on the coal body surface, the adhesion agent in the foam wall and crosslinking agent generation cross-linking reaction form and have certain viscoplasticity film at this moment, and this overburden can wrap up coal body and shutoff crack very densely.Free gas in the coal body is by charcoal absorption, and the outwards loss owing to the film effect, and the colloidal foam that therefore contains active carbon can effectively suppress lastingly the interior gas of coal body and outwards gush out.In addition, because adhesion agent has good shear thinning characteristic, so slurries obvious cross-linking reaction can not occur at once in the process of mechanical agitation foaming and transportation.After foam was transported to the goaf by the road, covers the coal body surface, shear action disappeared, and cross-linking reaction becomes obviously between the adhesion agent in the foam wall and the crosslinking agent at this moment, and the viscosity of system increases sharply, and has the effect of delayed cross-linking.Therefore this new colloidal foamed material effectively shutoff coal body crack, cover coal body, absorption goaf free gas reaches and suppresses the purpose that the goaf float coal discharges gas.The present invention has the characteristics such as method is simple, consumption is few, cost is low, safety and environmental protection, and gelation time is controlled, is with a wide range of applications.

The specific embodiment

The colloidal foam preparation method who contains active carbon that control goaf gas of the present invention is gushed out is as follows: add diameter less than 500 microns activated carbon powder in water, its quality is 1/10 of water quality; Add simultaneously xanthans as adhesion agent, the mass percent of xanthans and water is 0.3%, stirs, and forms the multiviscosisty solution with certain viscosity; In having certain density multiviscosisty solution, add simultaneously silicate of soda crosslinking agent and dodecyl benzyl dimethyl ammonium chloride blowing agent, the mass percent of silicate of soda and water is 0.3%, the mass percent of dodecyl benzyl dimethyl ammonium chloride blowing agent and water is 0.4%, mixes to form the mixed serum that contains multi-phase ingredients; Continue to introduce air in mixed serum, fully stir, form colloidal foam, the cumulative volume of introducing air is 10～30 times of water volume.With helicoidal pump the colloidal foam that configures is transported to the goaf through mining grouting pipe, makes its uniform fold leave over residual coal surface and shutoff coal body crack in the goaf, can play the effect that suppresses the coal Gas.

The present invention has obtained better effects through field experiment:

Embodiment one: refreshing eastern Coal Corporation boolean platform colliery belongs to modernized high-yield and high-efficiency mine, and work plane daily output 15000t because mining rate is large, causes the upper corner gas density higher, and conventional method is difficult to effectively solve the gas of upper corner.Employing is with the method for adopting with the glue injection body foam, solid phase be diameter less than the active carbon of 500 μ m, gas phase is the compressed air that air compressor produces, liquid phase is underground water.Configuration active carbon, adhesion agent and water quality are than being the multiviscosisty solution of 1:0.03:10, after stirring, in this multiviscosisty solution, add simultaneously silicate of soda and dodecyl benzyl dimethyl ammonium chloride, the in mass ratio 3:4:1000 preparation of silicate of soda, dodecyl benzyl dimethyl ammonium chloride and multiviscosisty solution, the formation mixed solution stirs.Control this mixed solution flow this moment is 15～20m ³/ h, compressed air require are 450m ³/ h constantly is input in the agitator by pipeline, and ceaselessly stirs with impeller-agitator, and foaming forms colloidal foam.The colloidal foam that generates is utilized mine grouting pipeline injection experiments object 22104 fully mechanized coal face goafs, each 12h that annotates continuously, can see having colloidal foam diffuse out behind the support this moment, illustrates that colloidal foam more evenly has been full of goaf, support rear portion, covers Residual coal in goaf.This work plane begins to inject the colloidal foam experiment on September 30th, 2012, each 12h that annotates continuously; After this work plane is whenever pushed ahead and was just annotated colloidal foam in 5 days one time.After having annotated colloidal foam at every turn, the content of test record upper corner gas density, compare with the upper corner gas density content that records before the glue injection body foam not, the injection before and after the upper corner variation ofgas density trend of surveying as shown in table 1, can find out, significantly decline occurs in institute's upper corner gas density of surveying after adopting colloidal foam, can effectively guarantee the safe back production of mine.

Upper corner variation ofgas density trend before and after the table 1 glue injection body foam

Embodiment two: state throws new collection two ore deposits and belongs to high gas and outburst mine, and along with to deep regional-750m horizontal-extending, gas emission sharply increases, and the phenomenon of transfiniting is arranged when causing back production face gas.Employing is with the method for adopting with the glue injection body foam, with diameter less than the active carbon of 500 μ m as solid phase, the compressed air that air compressor produces is as gas phase, underground water is as liquid phase.Configuration active carbon, adhesion agent and water quality are than being the multiviscosisty solution of 1:0.03:10, after stirring, in this multiviscosisty solution, add simultaneously silicate of soda and dodecyl benzyl dimethyl ammonium chloride, the in mass ratio 3:4:1000 preparation of silicate of soda, dodecyl benzyl dimethyl ammonium chloride and multiviscosisty solution, the formation mixed solution stirs.Control this mixed liquor flow this moment is 10～15m ³/ h, compressed air require are 350m ³/ h constantly is input in the agitator by pipeline, and ceaselessly stirs with impeller-agitator, and foaming forms colloidal foam.Utilize the mine grouting pipeline to be injected into 1603 working face face goafs the colloidal foam that generates, each 12h that annotates continuously, a large amount of colloidal foams is full of goaf, support rear portion more equably, covers Residual coal in goaf.This work plane is annotated 12h in beginning on December 31st, 2011 glue injection body foam at every turn continuously; After this work plane is whenever pushed ahead and was just annotated colloidal foam in 5 days one time.Each has annotated colloidal foam after, the content of test record upper corner gas density compares with the upper corner gas density content that records before the glue injection body foam not, injection front and back upper corner variation ofgas density trend is as shown in table 2.As can be seen from Table 2, significant decline occurs in upper corner gas behind the employing colloidal foam, guaranteed the mine safety back production.

Upper corner variation ofgas density trend before and after the table 2 glue injection body foam

Claims

1. one kind is used for the colloidal foam preparation method who contains active carbon that the control goaf gas is gushed out, and it is characterized in that comprising the steps:

2. according to claim 1 a kind of for the colloidal foam that contains active carbon gushed out of control goaf gas, it is characterized in that: the volume of air that continues to introduce in the described mixed solution is 10～30 times of water volume.