CN110975802A - Adsorbent for purifying coal bed gas or shale gas - Google Patents
Adsorbent for purifying coal bed gas or shale gas Download PDFInfo
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- CN110975802A CN110975802A CN201911324450.5A CN201911324450A CN110975802A CN 110975802 A CN110975802 A CN 110975802A CN 201911324450 A CN201911324450 A CN 201911324450A CN 110975802 A CN110975802 A CN 110975802A
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/16—Alumino-silicates
- B01J20/18—Synthetic zeolitic molecular sieves
- B01J20/186—Chemical treatments in view of modifying the properties of the sieve, e.g. increasing the stability or the activity, also decreasing the activity
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- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
- B01J20/28002—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their physical properties
- B01J20/28004—Sorbent size or size distribution, e.g. particle size
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- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L3/00—Gaseous fuels; Natural gas; Synthetic natural gas obtained by processes not covered by subclass C10G, C10K; Liquefied petroleum gas
- C10L3/06—Natural gas; Synthetic natural gas obtained by processes not covered by C10G, C10K3/02 or C10K3/04
- C10L3/10—Working-up natural gas or synthetic natural gas
- C10L3/101—Removal of contaminants
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
- C10L2290/542—Adsorption of impurities during preparation or upgrading of a fuel
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Abstract
The invention belongs to the technical field of adsorbents for pressure swing adsorption, and particularly discloses an adsorbent for purifying coal bed gas or shale gas. And then, the prepared high-purity natural clinoptilolite is used as a raw material, and is modified by strontium salt or sodium salt to obtain the sodium type or strontium type natural clinoptilolite. The adsorbent prepared by the invention has greatly improved adsorption capacity and selectivity, and can be used for separating and purifying CH such as coal bed gas or shale gas4/N2Mixture and relative to synthetic boilingThe stone reduces the production cost of the zeolite adsorbent.
Description
Technical Field
The invention relates to the technical field of adsorbents for pressure swing adsorption, in particular to an adsorbent for purifying coal bed gas or shale gas, which is prepared by taking natural clinoptilolite as a raw material.
Background
Adsorbents generally refer to solid substances that can effectively adsorb one or more components from a gas phase or a liquid phase, and have common characteristics of appropriate surface structure and pore structure, large specific surface area, strong selective adsorption capacity for the adsorbent, and no chemical reaction with the adsorbent or medium. The adsorbents commonly used in industry include activated carbon and carbon molecular sieves using carbon as raw material, and metallic and non-metallic oxide adsorbents such as silica gel, alumina, zeolite molecular sieves, natural clay, etc. Is currently at N2/CH4The most promising field of separation is natural clinoptilolite and ETS-4. Natural clinoptilolite is found in pyroclastic rock of the third century after the Jurassic period, especially tuff. The deposition environments of tuff are various, including oceans, offshore, diarrheal, freshwater lakes and roads, and are mainly formed by the alteration of volcanic glass by interstitial solution. Natural clinoptilolite often coexists with feldspar, quartz, montmorillonite ore and the like, thereby affecting the purity of clinoptilolite therein. Since the properties of clinoptilolite are mainly utilized when it is used as an adsorbent, the presence of impurities feldspar, quartz, montmorillonite ore affects the adsorption performance of clinoptilolite. The purity problem of clinoptilolite in natural clinoptilolite influences the application of natural clinoptilolite in industrial adsorbent, and is still in laboratory research stage at present. The present adsorbent is generally synthesized zeolite, which is synthesized by mixing sodium silicate solution and sodium aluminate solution in a predetermined ratio to produce aluminosilicate gel, heating and crystallizing. Various synthetic zeolites can be prepared by changing the mixing ratio of the components, the heating temperature, the stirring and other synthesis conditions. Synthetic zeolites have unique physicochemical properties such as crystal structure, pore size, surface electric field, adsorption separation energy, ion exchange energy, and solid acidity, and are used as functional substances such as adsorbents, molecular sieves, ion exchangers, and catalysts. Synthetic zeolites are expensive to produce and thus result in synthetic zeolitesAdsorbents like these are expensive.
Methane in the coal seam is a high-quality gaseous fuel and chemical raw material, and is an important harmful source for disaster factors of underground coal mine exploitation and atmospheric greenhouse effect. Along with the improvement of awareness of people on coal mine safety and environmental protection, the development and utilization of coal bed gas are very important at home and abroad in recent years. Coal bed methane released by coal mining in China every year is up to 60 billions of cubic meters, accounts for 30% of the total amount discharged all over the world, the utilization rate is only 7% -8%, and the resource loss is very large. One reason for this is that the coal bed gas contains CH4The purification and separation of (2) is not solved. The Pressure Swing Adsorption (PSA) technology is an effective gas separation and purification method, and the new application field comprises CH4/N2This will be developed in the field of coal bed gas utilization, since the pre-cleaned extracted coal bed gas can be regarded as CH4And N2The mixed gas of (1). For PSA separation, the selection of the adsorbent is a critical step. The zeolite molecular sieve has a unique structure suitable for the separation requirement of industrial gas, and can be modified by ion exchange, change of silicon-aluminum ratio, modulation of framework elements and the like, thereby realizing N2/O2、CH4/N2、CO/N2And CO/CH4And the like.
How to effectively utilize natural clinoptilolite and obtain high-purity clinoptilolite by purifying and removing impurities from the natural clinoptilolite to replace synthetic zeolite to produce natural clinoptilolite adsorbents, reduce the production cost of the adsorbents and widely apply Pressure Swing Adsorption (PSA) technology in the field of separation and purification of gases such as coal bed gas and the like, which is an important subject of current research.
Disclosure of Invention
The invention mainly aims to provide an adsorbent for purifying coal bed gas or shale gas, which is characterized in that natural clinoptilolite ore is purified, the chemical composition and the proportion of the natural clinoptilolite ore are further changed, the adsorption quantity and the selectivity of the prepared adsorbent are greatly improved, and the production cost of zeolite adsorbents is reduced compared with synthetic zeolite.
In order to realize the purpose, the invention adopts the technical scheme that: an adsorbent for purifying coal bed gas or shale gas is prepared by the following steps:
mixing high-purity natural clinoptilolite and 1-4 mol/L strontium salt aqueous solution or sodium salt aqueous solution, wherein the mixing ratio of the high-purity natural clinoptilolite to the strontium salt aqueous solution or the sodium salt aqueous solution is as follows: 10-20 ml of strontium salt aqueous solution or sodium salt aqueous solution is correspondingly used for per gram of high-purity natural clinoptilolite, then the mixture is stirred and reacted for 1-4 hours at the temperature of 70-90 ℃, then the mixture is filtered, the obtained solid is dried and ground, and then the solid is pressed and granulated to obtain a granular adsorbent, wherein the adsorbent is a strontium adsorbent or a sodium adsorbent, and the particle size range of the granular adsorbent is 0.5-1.5 mm;
wherein the strontium salt aqueous solution is SrCl2·6H2O prepared aqueous solution; the sodium salt aqueous solution is sodium chloride aqueous solution;
the high-purity natural clinoptilolite is obtained by mineral separation of natural clinoptilolite raw ores, and the mineral separation method comprises the following steps:
crushing: crushing the block-shaped natural clinoptilolite raw ore into a fine crushed product with the granularity less than or equal to 3 mm;
fine grinding: adding water into the fine crushing product to prepare ore pulp with the solid content of 45-55%, and finely grinding the obtained ore pulp by using a ceramic grinder until the particle size of the obtained ore pulp material is-200 meshes and the content of the obtained ore pulp material is 80-90%;
and (3) reselecting to remove montmorillonite: reselecting the ore pulp material obtained after fine grinding by using a hydrocyclone, and separating in the hydrocyclone to obtain overflow sludge and underflow ore pulp, wherein the main component of the overflow sludge is montmorillonite;
separation by a concentrating table: feeding the underflow ore pulp into a concentrating table for separation, wherein the obtained overflow product is ore pulp containing a high-purity natural clinoptilolite product, and the obtained tailings mainly contain quartz feldspar heavy minerals;
and dehydrating the obtained ore pulp containing the high-purity natural clinoptilolite product to obtain the high-purity natural clinoptilolite product, wherein the content of clinoptilolite is 80-90%.
Preferably, 20ml of strontium salt aqueous solution or sodium salt aqueous solution is used per gram of high purity natural clinoptilolite.
Preferably, natural clinoptilolite of high purity is mixed with an aqueous strontium salt solution or an aqueous sodium salt solution, followed by a reaction with stirring at 80 ℃ for 2.5 hours.
Preferably, in the crushing step, the blocky natural clinoptilolite raw ore is crushed in two stages, wherein a jaw crusher is adopted for the first-stage crushing, and a cone crusher is adopted for the second-stage crushing.
Experiments show that the adsorbent provided by the invention has specific selective adsorption performance on nitrogen and can be applied to CH4/N2The separation and purification of the mixed gas can be used for enriching and purifying methane in coal bed gas or shale gas.
The adsorbent provided by the invention is prepared from natural clinoptilolite serving as a raw material through mineral separation to obtain high-purity natural clinoptilolite, during mineral separation, physical and chemical differences of different mineral components in the natural clinoptilolite are utilized, crushing and grinding are adopted according to the mineralogical properties of the natural clinoptilolite to obtain ore pulp, and then cyclone separation, table gravity separation and dehydration are carried out to obtain a high-purity natural clinoptilolite product. Firstly, according to the embedding condition of clinoptilolite and feldspar, quartz and montmorillonite in natural clinoptilolite ore, crushing and grinding the natural clinoptilolite ore until the content of ore pulp material with granularity of-200 meshes (negative number indicates that the mesh which can leak through the mesh is smaller than the mesh size) is 80-90%, realizing the complete dissociation of clinoptilolite, feldspar, quartz and montmorillonite, then carrying out gravity separation by using a hydrocyclone, forming overflow mud due to the fine and light montmorillonite, flowing out from the upper part, enabling quartz, feldspar and clinoptilolite to enter underflow ore pulp, discharging from the lower part of the hydrocyclone, then entering a concentrating table, carrying out gravity separation by the concentrating table, forming sediment by quartz and feldspar heavy minerals, discharging as tailings, enabling light mineral clinoptilolite to enter overflow products, and obtaining overflow products, namely the ore pulp containing high-purity natural clinoptilolite products, and dehydrating and drying to obtain a high-purity natural clinoptilolite product, wherein the content of the clinoptilolite is 80-90%. Starting with the pore structure and the exchange mechanism of the high-purity natural clinoptilolite, the prepared high-purity natural clinoptilolite is used as a raw material, strontium salt or sodium salt modification is directly carried out to obtain the sodium type or strontium type natural clinoptilolite, and the exchange rate of strontium ions or sodium ions in the obtained sodium type or strontium type natural clinoptilolite is high.
The invention extracts the effective components of the natural clinoptilolite by purifying the natural clinoptilolite ore and further changes the chemical composition and the proportion of the natural clinoptilolite, so that the adsorption capacity and the selectivity of the prepared adsorbent are greatly improved, and the production cost of the zeolite adsorbent is reduced compared with the synthetic zeolite.
Through tests, the strontium zeolite adsorbent provided by the invention has N at normal temperature and normal pressure2The adsorption capacity reaches 11-13cm3Per g, to CH4The adsorption amount of (B) is 0.3-1.1cm3The separation selection coefficient is more than 10, and the method can be applied to concentration and purification of coal bed gas or shale gas.
Through tests, the sodium type natural clinoptilolite adsorbent provided by the invention has N at normal temperature and normal pressure2The adsorption capacity reaches 9-11cm3Per g, to CH4The adsorption amount of (A) is 0.5-1.0cm3The separation selection coefficient is more than 10, and the method can be applied to concentration and purification of coal bed gas or shale gas.
Drawings
FIG. 1 shows an apparatus for evaluating the performance of an adsorbent used in the present invention.
Detailed Description
The technical solution of the present invention will be described in detail by specific examples.
Firstly, preparing high-purity natural clinoptilolite. The high-purity natural clinoptilolite is obtained by mineral separation of natural clinoptilolite raw ores, and the mineral separation method comprises the following steps:
crushing: crushing the block-shaped natural clinoptilolite raw ore into a fine crushed product with the granularity less than or equal to 3 mm; in the step, the blocky natural clinoptilolite raw ore is subjected to two-stage crushing, wherein a jaw crusher is adopted for the first-stage crushing, and a cone crusher is adopted for the second-stage crushing;
fine grinding: adding water into the fine crushing product to prepare ore pulp with the solid content of 55%, and finely grinding the obtained ore pulp by using a ceramic grinder until the particle size of the obtained ore pulp material is minus 200 meshes and the content of the obtained ore pulp material is 86%;
and (3) reselecting to remove montmorillonite: reselecting the ore pulp material obtained after fine grinding by using a hydrocyclone, and separating in the hydrocyclone to obtain overflow sludge and underflow ore pulp, wherein the overflow sludge mainly comprises montmorillonite;
separation by a concentrating table: feeding the underflow ore pulp of the hydrocyclone into a concentrating table for separation, wherein the obtained overflow product is ore pulp containing a high-purity natural clinoptilolite product, and the obtained tailings mainly contain quartz feldspar heavy minerals;
and dehydrating the obtained ore pulp containing the high-purity natural clinoptilolite product to obtain the high-purity natural clinoptilolite product, wherein the content of clinoptilolite is 88.1%. The natural clinoptilolite adsorbent is prepared by taking the prepared high-purity natural clinoptilolite as a raw material.
Example 1
The strontium natural clinoptilolite adsorbent is prepared by the method comprising the following steps:
mixing high-purity natural clinoptilolite and 4mol/L strontium salt aqueous solution in a reaction kettle, wherein the strontium salt aqueous solution is SrCl2·6H2O prepared aqueous solution; the mixing proportion of the high-purity natural clinoptilolite and the strontium salt aqueous solution is as follows: 20ml of strontium salt aqueous solution is correspondingly used for per gram of high-purity natural clinoptilolite, then the mixture is stirred and reacted for 2.5 hours at the temperature of 80 ℃, then the mixture is filtered, the solid obtained by filtering is dried and ground, and then the solid is pressed and granulated to obtain the granular strontium type adsorbent, wherein the grain size range of the granular adsorbent is 0.5-1.5 mm.
An adsorption test was performed using the granular strontium-type natural clinoptilolite-based adsorbent provided in this example, and the prepared granular strontium-type natural clinoptilolite-based adsorbent was first calcined at 300 ℃ for 1 hour, and then its adsorption performance was tested.
The adopted adsorbent performance evaluation device is shown in figure 1 and comprises an adsorption tower 10, wherein a packing bed layer is arranged in the adsorption tower and is used for filling an adsorbent to be tested, the top of the adsorption tower 10 is connected with an upper gas outlet pipeline 101, the bottom of the adsorption tower 10 is connected with a lower gas outlet pipeline 102, and the upper gas outlet pipeline 101 is connected with a first common valve 12 and a first needle valve 11 in series;
the performance evaluation device also comprises an argon gas bottle 1 and a methane-nitrogen gas mixed gas bottle 2, wherein a first pressure reducing valve 3 is arranged at the gas outlet of the argon gas bottle 1, a second pressure reducing valve 4 is arranged at the gas outlet of the methane-nitrogen gas mixed gas bottle 2, the first pressure reducing valve 3 is communicated with an upper gas outlet pipeline 101 through an argon gas conveying pipeline 111, the second pressure reducing valve 4 is communicated with a lower gas outlet pipeline 102 through a mixed gas conveying pipeline 112, a second needle valve 5 and a second common valve 6 are connected to the argon gas conveying pipeline 111 in series, and a third common valve 7 is connected to the mixed gas conveying pipeline 112 in series;
the performance evaluation device further comprises a gas analyzer 21, the gas analyzer 21 is communicated with the argon conveying pipeline 111 and the upper gas outlet pipeline 101 through a first gas pipeline 230, a fourth common valve 14, a third needle valve 17 and a mass flow meter 18 are connected to the first gas pipeline 230 in series, the gas analyzer 21 is in communication connection with a PLC (programmable logic controller) 23, the first gas pipeline 230 is further connected with a first pressure sensor 13, the first pressure sensor 13 is in communication connection with the PLC 23, and the PLC 23 is in communication connection with a computer 24;
the performance evaluation device further comprises a vacuum pump 22, the vacuum pump 22 is communicated with the mixed gas conveying pipeline 112 and the lower gas outlet pipeline 102 through a second gas pipeline 201, a fifth common valve 15 and a sixth common valve 16 are connected to the second gas pipeline 201 in series, a second pressure sensor 19 is further connected to the second gas pipeline 201, and the second pressure sensor 19 is in communication connection with the PLC 23.
Pressure swing adsorption separation of CH4/N2The operation of the performance evaluation device of the adsorbent for mixed gas is as follows:
1. loading, namely filling an adsorbent to be tested into the adsorption tower 10, namely adopting the granular strontium type natural clinoptilolite adsorbent provided by the embodiment, connecting an experimental device, and confirming that all valves are closed;
2. setting a specific flow through a computer 24, rotating the first pressure reducing valve 3 to open the first pressure reducing valve 3, then opening the second needle valve 5 and the second common valve 6, introducing argon into the adsorption tower 10, and adjusting the pressure required by the experiment by adjusting the first pressure reducing valve 3;
3. when the detection of the first pressure sensor 13 is passed, the computer 24 displays that the bed pressure in the adsorption tower 10 reaches the experimental set pressure, the second needle valve 5 and the second common valve 6 are closed, whether the pressure changes is judged, the pressure does not change any more, namely the air tightness of the device is good, and the device needs to be overhauled to remove air leakage when the pressure changes. After the gas tightness is determined to be good, reopening the second needle valve 5, the second common valve 6, the fourth common valve 14 and the third needle valve 17, purging with argon for a period of time until the gas analyzer 21 displays that the methane concentration is 0, so that the detection accuracy can be ensured, then closing the second needle valve 5, the second common valve 6, the fourth common valve 14 and the third needle valve 17, then opening the first needle valve 11 and the first common valve 12, discharging the gas in the adsorption tower 10 until the normal pressure is reached, and closing the first needle valve 11 and the first common valve 12;
4. starting the vacuum pump 22, opening the fifth common valve 15 and the sixth common valve 16, starting to vacuumize, maintaining the vacuum degree at-0.1 MPa (close to 0MPa, observed by the second pressure sensor 19), closing the fifth common valve 15 and the sixth common valve 16 after 20min, and closing the vacuum pump 22;
5. opening a second needle valve 5 and a second common valve 6, filling argon into the adsorption tower 10 to a required pressure (shown together according to a computer 24 and a first pressure reducing valve 3), and closing the second needle valve 5 and the second common valve 6 after the pressure of the adsorption tower 10 is stable;
6. opening the second pressure reducing valve 4 of the methane nitrogen mixed gas cylinder 2, opening the third common valve 7, displaying that the pressure is reduced by the computer 24, adjusting the second pressure reducing valve 4 to keep the pressure consistent with the previous setting, then opening the fourth common valve 14 and the third needle valve 17 of the valves, and simultaneously recording the time, namely the adsorption starting time;
7. when the gas analyzer 21 detects that the nitrogen concentration is the nitrogen concentration in the methane-nitrogen mixed gas cylinder 2, the experiment is stopped, the evacuation and adsorption data are collected, calculation is performed, and the adsorption performance of the adsorbent is evaluated according to the calculation result.
Through tests, the strontium zeolite adsorbent provided by the invention has N at normal temperature and normal pressure2Amount of adsorptionUp to 12cm3Per g, to CH4Has an adsorption amount of 0.8cm3The separation selection coefficient is more than 10, and the method can be applied to concentration and purification of coal bed gas or shale gas.
Example 2
The sodium natural clinoptilolite adsorbent is prepared by the method comprising the following steps:
mixing high-purity natural clinoptilolite and 2mol/L sodium chloride aqueous solution, wherein the mixing ratio of the high-purity natural clinoptilolite to the sodium chloride aqueous solution is as follows: 20ml of sodium chloride aqueous solution is correspondingly used for each gram of high-purity natural clinoptilolite, then the natural clinoptilolite is stirred and reacted for 3 hours at the temperature of 80 ℃, then the natural clinoptilolite is filtered, the obtained solid is dried and ground, and then the solid is pressed and granulated to obtain the granular sodium type adsorbent, wherein the grain size range of the granular adsorbent is 0.5-1.5 mm.
An adsorption test was performed using the granular sodium-type natural clinoptilolite-based adsorbent provided in this example, and the prepared granular sodium-type natural clinoptilolite-based adsorbent was first calcined at 300 ℃ for 1 hour, and then its adsorption performance was tested.
Similarly, the performance evaluation apparatus of the adsorbent used is shown in FIG. 1, and the procedure is general in example 1. Through tests, the sodium type natural clinoptilolite adsorbent provided by the invention has N at normal temperature and normal pressure2The adsorption capacity reaches 10cm3Per g, to CH4Has an adsorption amount of 0.8cm3The separation selection coefficient is more than 10, and the method can be applied to concentration and purification of coal bed gas or shale gas.
Claims (4)
1. The adsorbent for purifying the coal bed gas or the shale gas is characterized by being prepared by the following method:
mixing high-purity natural clinoptilolite and 1-4 mol/L strontium salt aqueous solution or sodium salt aqueous solution, wherein the mixing ratio of the high-purity natural clinoptilolite to the strontium salt aqueous solution or the sodium salt aqueous solution is as follows: 10-20 ml of strontium salt aqueous solution or sodium salt aqueous solution is correspondingly used for per gram of high-purity natural clinoptilolite, then the mixture is stirred and reacted for 1-4 hours at the temperature of 70-90 ℃, then the mixture is filtered, the obtained solid is dried and ground, and then the solid is pressed and granulated to obtain a granular adsorbent, wherein the adsorbent is a strontium adsorbent or a sodium adsorbent, and the particle size range of the granular adsorbent is 0.5-1.5 mm;
wherein the strontium salt aqueous solution is SrCl2·6H2O prepared aqueous solution; the sodium salt aqueous solution is sodium chloride aqueous solution;
the high-purity natural clinoptilolite is obtained by mineral separation of natural clinoptilolite raw ores, and the mineral separation method comprises the following steps:
crushing: crushing the block-shaped natural clinoptilolite raw ore into a fine crushed product with the granularity less than or equal to 3 mm;
fine grinding: adding water into the fine crushing product to prepare ore pulp with the solid content of 45-55%, and finely grinding the obtained ore pulp by using a ceramic grinder until the particle size of the obtained ore pulp material is-200 meshes and the content of the obtained ore pulp material is 80-90%;
and (3) reselecting to remove montmorillonite: reselecting the ore pulp material obtained after fine grinding by using a hydrocyclone, and separating in the hydrocyclone to obtain overflow sludge and underflow ore pulp, wherein the main component of the overflow sludge is montmorillonite;
separation by a concentrating table: feeding the underflow ore pulp into a concentrating table for separation, wherein the obtained overflow product is ore pulp containing a high-purity natural clinoptilolite product, and the obtained tailings mainly contain quartz feldspar heavy minerals;
and dehydrating the obtained ore pulp containing the high-purity natural clinoptilolite product to obtain the high-purity natural clinoptilolite product, wherein the content of clinoptilolite is 80-90%.
2. The sorbent for purifying coal bed gas or shale gas as claimed in claim 1, wherein 20ml of strontium salt aqueous solution or sodium salt aqueous solution is used per gram of high purity natural clinoptilolite.
3. The sorbent for purifying coal bed gas or shale gas as claimed in claim 1, wherein the high purity natural clinoptilolite is mixed with strontium salt aqueous solution or sodium salt aqueous solution, and then stirred and reacted at 80 ℃ for 2.5 hours.
4. The adsorbent for purifying coal bed gas or shale gas as claimed in claim 1, wherein in the crushing step, the lump natural clinoptilolite raw ore is subjected to two-stage crushing, wherein a jaw crusher is used for one-stage crushing, and a cone crusher is used for the second-stage crushing.
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