69results about How to "Realize green mining" patented technology

The invention relates to a process for leaching rare earth from ion-adsorption type rare earth ore without using ammonium salt. The process comprises the step of replacing ammonium salt by taking a mixture of calcium, magnesium and sodium salts as a leaching agent and taking non-ammonium salts, such as calcium hydroxide, magnesium hydrate or sodium hydroxide as a precipitator. According to the process disclosed by the invention, the ammonia nitrogen pollution problem in exploitation of ion-adsorption type rare earth is radically solved; environmental-friendly exploitation of the ion-adsorption type rare earth can be realized; the process disclosed by the invention has higher economic benefit and social benefit.

The invention provides a filling wall body capable of protecting a laneway through soft yielding in non-chain-pillar filling mining and a construction method of the filling wall body capable of protecting the laneway through soft yielding in non-chain-pillar filling mining, and belongs to the coal mine tunnel supporting and protecting technology. The filling wall body is composed of an upper portion and a lower portion, wherein the upper portion is an expansible organic foaming filling main wall body with large shrinkage, the foaming multiple ranges from 10 to 75, the uniaxial compressive strength is not more than 1.2Mpa when the volume compression amount is 80%, the lower portion is a paste-like filling main wall body, the paste-like filling main wall body is composed of the mixture of water, cement, coal ash, river sand and gangue according to the mass ratio of 1:0.3:1.2:1.7:2.8, the 1d uniaxial compressive strength is larger than 1.2Mpa, and the 28d strength is larger than 10Mpa. The filling height and the configuration proportion of the two filling main wall bodies are adjusted through calculation, therefore, the contractibility of the filling wall body can be kept within a reasonable range, the filling wall body capable of protecting the laneway through soft yielding in non-chain-pillar filling mining can better adapt to the motion law of the roof strata, and the stability of gob-side entry retaining is guaranteed.

The invention relates to the technical field of combustion water heaters, and relates to a roof contact method for stope filling. The roof contact method for the stope filling comprises the followingstep that a stope empty area is filled with slag to a certain height to obtain a residual empty area, the height of the residual empty area is measured, the position of the highest point is determined, a hollow anchor rod is installed at the highest point, and a filling pipe is installed on the hollow anchor rod; a first dewatering pipe and a dewatering pipe are installed at the highest point, anda third dewatering pipe and a second dewatering pipe are installed from top to bottom according to the height difference; and the opening between the residual empty area and an inlet or a connectingchannel is blocked, and then filling slurry is conveyed into the filling pipe to realize roof-contacted filling of the residual empty area. The roof contact method for the stope filling has the characteristics of realizing effective roof-contacted filling of the stope empty area, and effectively ensuring the strength of the stope empty area.

The invention discloses a rare earth in-situ leaching and enriching process for ionic rare earth ore. The rare earth in-situ leaching and enriching process comprises the following steps: step 1, injection an ore leaching agent and a shrinkage agent into ore body, and performing sited and in-situ ore leaching to enable 'ion-phase' and part of 'other-phase' rare earth to leach out to obtain a mother liquor; step 2, pumping an impurity removal agent I into the medium and high-concentration mother liquor for impurity removal, precipitating through a precipitator, washing with clear water, filtering, and firing to obtain a solid rare earth product, wherein the impurity removal agent I is a mixed solution of a sodium bicarbonate solution and a sodium carbonate solution, and the precipitator is a sodium bicarbonate solution; and pumping an impurity removal agent II into the low-concentration mother liquid for neutralization to remove aluminum impurities, pumping ion exchange columns into the mother liquor from which aluminum is removed for adsorptive enrichment of rare earth ions, and desorbing with acid to obtain a liquid rare earth product, wherein the impurity removal agent II is lime cream. The independently researched and developed brand-new agents are used together with the whole set of innovative technology to achieve the purposes of significant change of the ionic rare earth extraction process, comprehensive optimization of technical-economic indicators and friendly ecological environment.

The invention provides an underground coal and gangue separation system and coal and gangue separation method, comprising a material conveying roadway, a downhole coal and gangue separation passage, a first roadway, a second roadway, a vertical roadway, a first connection and a second connection. The underground coal and gangue separation system and coal and gangue separation method is provided to allow underground separation and separate storage of a coal-gangue mixture, the fact that the original underground wash-dressing process is complex, equipment is too large and wash-dressing capacity is low is improved, the coal-gangue mixture conveying problem and gangue surface stacking problem are solved thoroughly, ineffective lifting and conveying of a mine are greatly reduced, and green mining is truly achieved.

A reaction type gangue crushing and separating tester comprises a belt conveying portion and a roller accelerated crushing portion; the belt conveying portion is a conventional belt conveyer portion; the roller accelerated crushing portion comprises a housing, an accelerating wheel is mounted in the housing, the wall of the housing is provided with three auxiliary crushing blocks, the right side of the housing is provided with a material casting outlet, the accelerating wheel is controlled by a motor fixed in the housing, a reaction plate is arranged in the material casting direction, gangue is crushed by the reaction plate and drops on a vibrating screening mechanism that is inclined, and the gangue and pulverized coal are separated by the vibrating screening mechanism. A speed sensor is mounted on a rotary shaft of the tester, such that the tester can meet the need of a gangue separator for material conveying, allows the material casting speed to be controlled and adjusted, and is of certain testing study significance.

The invention relates to two-way conveying equipment and an application method thereof. The two-way conveying equipment comprises belt conveyors and a bracket; the belt conveyors have annular conveying belts; multiple belt conveyors are provided, and include previous-stage belt conveyors and later-stage belt conveyors; the previous-stage belt conveyors and the later-stage belt conveyors form a relay conveying structure; and the annular conveying belts are divided into upper and lower two layers, and include upper conveying belts for forwards conveying and lower conveying belts for reversely conveying. The invention further proposes the application method of the two-way conveying equipment. The two-way conveying equipment has the following beneficial effects: the belt conveyors capable of conveying in two directions, multifunctional unloaders, transfer point intersection and three-dimensional joint are adopted to realize the purposes of synchronous transportation by the upper and lower layers of belts of the belt conveyors, two-way continuous transportation of raw coals and gangue and two-way unloading; the equipment utilization rate is increased; the use number of gangue transportation belt machines is reduced; and the operation efficiency of equipment with multiple purposes on one machine reaches 100%.

The invention provides a method for determining the staggered distance between dual coal seam upper-lower simultaneous mining working faces in the propelling direction, and belongs to the technical field of coal mining. The method comprises the steps that the ideal staggered distance range is found out and obtained; according to the ideal staggered distance range, an ultimate bearing capacity computational formula during plastic slip of rock and soil is utilized to obtain a computational formula of the maximum depth H<max> of an upper coal seam bottom plate destruction region under the ultimate bearing pressure condition, and thus a computational formula of the maximum horizontal distance L<max> of an upper coal seam bottom plate broken rock stratum is obtained; a pressure-stabilizing mechanical model and a pressure-reducing mechanical model for the propelling direction of upper-lower coal seam working face simultaneous mining of dual coal seam mining are established, thus the maximumhorizontal distance of the upper coal seam bottom plate broken rock stratum, the bottom plate stress transfer angle and the spacing between an upper coal seam and a lower coal seam are obtained, and acomputational formula of the staggered distance in the pressure-stabilizing propelling direction and the pressure-reducing propelling direction is determined; and the computational result in the step3 is corrected. According to the method, the mine pressure strength of the lower coal seam working face and the earth surface damage degree during simultaneous mining of the dual coal seam superposition regions can be effectively lowered, and efficient and environment-friendly mining of the dual coal seams is achieved.

The invention discloses a method and a device for performing plasma ascending cracking on remaining coal pillar in residual mining area and belongs to the technical field of coal mining. The remainingcoal pillar in the residual mining area is subjected to ascending cracking by a plasma device from an underlie coal seam, impact wave is formed by completely utilizing the characteristic that strongmovement along ions instantly generate high temperature and high pressure to enable the coal pillar to generate crack and expand, the integrity of the coal pillar is reduced and the aims of weakeningstrength, releasing stress and retarding strata behavior are fulfilled, so that green mining of coal is realized and safety production is realized.

The invention belongs to the technical field of transport equipment of an open pit coal mine, and particularly relates to a continuous walking type transport loader of an open pit coal mine, which is used for solving the problem of a loader for existing open mining. A receiving part, a main rack and a discharging part main body are all of a welded groove-shaped structure, so that an upper chain channel and a lower chain channel are formed, and are hinged together by virtue of a pin roll to form a coal conveying chain channel of the whole equipment, a scraper chain is arranged in the coal conveying chain channel and penetrates through the whole coal conveying chain channel, the upper chain channel is provided with a chain pressing block, a transport driving chain wheel and a tail guide wheel are respectively arranged at two ends of the scraper chain and are meshed and linked with the scraper chain, the scraper chain drives a chain wheel shaft to be linked with transport driving parts which are arranged at the left side and the right side, and the transport driving parts are respectively provided with a transport driving part protecting cover. According to the continuous walking type transport loader, a truck transporting link is eliminated, the transport cost is lowered, the equipment investment is reduced, the production capability and the production efficiency are improved, the cost of per ton coal is lowered, and the environmental-friendly mining of coal is realized.

The invention relates to a surrounding rock stability control method for a deep ultra-large section dense chamber group. The technical problem that existing deep ultra-large section chamber surrounding rock is unstable is solved. The method comprises the following steps that geological conditions of coal and rock masses are analyzed, and physical and mechanical parameters of the coal and rock masses are measured; support parameters are determined according to the chamber surrounding rock deformation rule and the chamber surrounding rock stability mechanism under the high stress condition; theposition and the size of an ultra-large section chamber are determined according to the analysis result and the surrounding rock physical and mechanical parameters; tunneling is performed in a drilling and blasting mode; according to the support parameters, a combined supporting mode of a metal net, anchor rods, anchor cables and sprayed concrete is adopted for supporting the arch-shaped ultra-large section of the chamber; and the coal seam is mined, and gangue generated in the post-mining area is used for backfilling into the goaf of the pre-mining area. According to the method, the construction process of the deep ultra-large section chamber is perfected, the supporting strength is improved, the deformation of the surrounding rock of the chamber is controlled to be stabilized within an allowable range for a long time, later maintenance of the chamber is reduced, secondary supporting is avoided, and meanwhile green mining is achieved.

The invention discloses a method for microwave heating reducing of the composite strong mine pressure of a thick and hard top plate and a left coal pillar. A microwave heating device is adopted, a T-shaped drill well is drilled on the ground over the residual mining area, the T-shaped drill well is divided into two parts including a T-shaped drill well vertical section and a T-shaped drill well horizontal section, the T-shaped drill well vertical section penetrates through the overlying coal bed thick and hard top plate and an overlying coal bed to arrive at the interior of the underlying residual mining area left coal pillar, the T-shaped drill well horizontal section in the overlying coal bed thick and hard top plate is parallel to the work plane pushing direction, one well has dual purposes, pre-splitting is conducted on the overlying coal bed thick and hard top plate and the overlying residual mining area left coal pillar, and the purpose of reducing the composite strong mine pressure of the thick and hard top plate and the residual mining area left coal pillar is achieved. According to the method, the characteristics that microwave heating rock breaking efficiency is high, theenergy density is large, adaptability is wide, and penetrability is high are sufficiently utilized, coal mine green mining is achieved, and safety production is achieved.

The invention discloses a green extraction method of an ionic rare earth ore calcium salt system. Calcium salt is taken as an ore leaching agent, calcium oxide is taken as a purification impurity removal agent, and calcium oxide is taken as a precipitant; the ore leaching agent, chlorine removal and heavy metal elements are recovered in a form of Friedel's salt; no ammonia nitrogen and high-salt wastewater is discharged in the whole process, the process is smooth, the product impurity content is low, and after ore closing, the mining area environment influence is small, and green and environment-friendly mining of ionic rare earth can be implemented. In addition, the method takes calcium chloride as a main component, a small amount of acid regulators such as aluminum chloride, ferric chloride and ammonium chloride are added, the formed composite salt ore leaching agent is a main component of ore soil, and compared with an ore leaching system with ammonium salt, magnesium salt, sodium salt and potassium salt as main components, the composite salt ore leaching agent has almost no influence on the environment, the leaching rate and the leaching peak concentration of rare earth can beeffectively improved, the tailing phenomenon of the ore leaching agent is reduced, the ore leaching time is shortened, and the ore leaching efficiency is improved.

The invention discloses a stope structure arrangement method applicable to gently inclined medium and thick ore body combination sectioned mining. Lower sectional stopes (2) and upper sectional stopes(3) are alternately arranged in the vertical direction of an ore body every 10-15 m, each lower sectional stopes (2) and upper sectional stopes (3) are combined into a mining unit (1); studdings (4)are formed at the ends of the mining unit (1); cutting troughs are formed in the stopes with slot raises (10) as a free surface; ore falls into ditches (9); and ore is loaded in an ore loading approach road (8) through a carry-scraper, carried to an ore draw shaft (11) through an ore removal roadway (7), and then dropped to a haulage roadway (12) to be loaded and conveyed out. Every two sectionalstopes are divided into a mining unit for mining, projects such as the ore removal roadway, the ore draw shaft and a slope road linking taxiway are shared, the accurate mining cost is reduced, the preparation time for accurate mining work is saved, the mining efficiency is improved, mined waste rock can be processed into building materials for sale, and new storage space for tailings filling is additionally formed.

The invention belongs to the technical field of dust removal, and particularly relates to an efficient and intelligent dust removal system for a mine. The system comprises a control device, a foam dust-removal device, a fan dust-removal device and a dust sensor; the control device is connected with the foam dust-removal device, the fan dust-removal device and the dust sensor; and the control device comprises a first intrinsically-safe power supply, a first alternating-current power supply, a second alternating-current power supply, a second intrinsically-safe power supply, a dust concentrationsensor, a dust sensor switch, a power switch, a toggle button and an auxiliary solenoid valve button. According to the system, intelligent dust removal can be realized, manual control is not required, the intelligent dust removal system starts equipment intelligently according to the dust concentration of the working surface, the dust removal efficiency is high, energy consumption and utilizationare optimized, a safe and comfortable production environment is provided, the driving working surface of the system is dust-free, noiseless and pollution-free, and green mining is realized. The system is applied to dust removal.