CN107309075A - Collophane beneficiation method - Google Patents
Collophane beneficiation method Download PDFInfo
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- CN107309075A CN107309075A CN201710671979.9A CN201710671979A CN107309075A CN 107309075 A CN107309075 A CN 107309075A CN 201710671979 A CN201710671979 A CN 201710671979A CN 107309075 A CN107309075 A CN 107309075A
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- collophane
- ore pulp
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B7/00—Combinations of wet processes or apparatus with other processes or apparatus, e.g. for dressing ores or garbage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B9/00—General arrangement of separating plant, e.g. flow sheets
Abstract
The invention belongs to technical field of beneficiation, and in particular to a kind of collophane beneficiation method.It is complicated for existing collophane beneficiation method flow, production cost is high, the problems such as ore dressing effect is bad, the present invention provides a kind of collophane beneficiation method, including the step such as collophane slurrying, the classification of collophane ore pulp, fine fraction flotation of ore pulp, concentrate slurry separation of solid and liquid, the present invention is mainly the grinding particle size by controlling collophane, separating coarse-grained level ore pulp and fine fraction ore pulp, coarse fraction ore pulp does not do flotation processing, flotation only is carried out to fine fraction ore pulp, floating agent usage amount is saved, flotation flowsheet is reduced, flotation cost is lower.Beneficiation method of the present invention is simple to operate, and equipment requirement is not high, suitably promotes the use of.
Description
Technical field
The invention belongs to technical field of beneficiation, specifically related to a kind of collophane beneficiation method.
Background technology
With the high speed development of China's Phosphate Fertilizer Industry, the yield of phosphorus ore is sharply increased, and abundant ore source is more and more deficienter, I
State, which will enter, large-scale develops and utilizes the mid low grade phosphate rock epoch.Mid low grade phosphate rock can be divided into carbonic acid according to gangue species difference
Salt phosphorus ore and silicate phosphorus ore.The ore-dressing technique of carbonate phosphorus ore is ripe, typically using phosphoric acid or sulfuric acid as inhibitor, with saturation
Fatty acid soaps are collecting agent, select flow to carry out ore dressing using counter.
Silicates phosphorus ore is generally collophane, and valuable mineral particle is thin, the embedding cloth of mineral is close, objectionable impurities is more, impurity
Based on quartz and alumino-silicate, also a small amount of iron-bearing mineral.The ore dressing of silicates phosphorus ore typically uses direct flotation flow, i.e.,
In alkaline environment, silicic acid salt inhibitor is used as using waterglass.But very thin, the general mesh sieve of mistake 200 ground by silicates phosphorus ore
More than 80%, meticulous granularity can cause hardness relatively low gangue in part overground, cause argillization degree to raise, and sorting environment is disliked
Change, floatation process is interfered.Traditional floatation equipment is when handling silicates phosphorus ore, and collecting agent and inhibitor consumption are significantly
Rise, while flotation flowsheet structure is tediously long, flotation cost high, it is less economical.If phosphorus ore mill is excessively thick, during key player on a team, compared with
Thick valuable mineral collophane floatability is poor, substantially non-rising, stays in roughing and scavenger flotation cell and eventually enters into flotation tailing, causes
Ore dressing yield is low can not to meet economic expection.
The content of the invention
The technical problem to be solved in the present invention is:Existing collophane beneficiation method flow is complicated, and production cost is high, ore dressing
The problems such as effect is bad.
The present invention solve technical problem technical scheme be:A kind of collophane beneficiation method is provided.This method includes following
Step:
A, collophane slurrying
Collophane is added water levigate to less than 74 μm and accounts for 35~50%, ore pulp is made;
B, the classification of collophane ore pulp
Ore pulp obtained by step a is classified, the coarse fraction ore pulp of particle diameter >=74 μm and 74 μm of particle diameter < particulate is obtained
Level ore pulp;
C, fine fraction flotation of ore pulp
The fine fraction ore pulp that step b is obtained carries out roughing, and the concentrate A that roughing is obtained carries out concentrate A 2-3 essence again
Choosing obtains concentrate B, and concentrate B obtains concentrate C through reverse flotation;
The mine tailing that roughing is obtained is scanned, and is scanned and is obtained concentrate D and return to ore-sorting system mixing with fine fraction ore pulp, then enters
Row roughing;
D, concentrate slurry separation of solid and liquid
The coarse fraction ore pulp that step b is obtained merges with the concentrate C that step c is obtained, and carries out separation of solid and liquid, obtains product phosphorus
Concentrate.
Wherein, in above-mentioned collophane beneficiation method, the ratio that adds water described in step a adds water 470 for collophane per ton~
610 kilograms.
Wherein, in above-mentioned collophane beneficiation method, ore pulp moisture content described in step a is 32~38%.
Wherein, in above-mentioned collophane beneficiation method, the collophane main component described in step a is apatite, in addition to
At least one of dolomite, montmorillonite, pyrophillite, illite or gibbsite.
Wherein, in above-mentioned collophane beneficiation method, the classification described in step b is carried out using current cyclosizer, point
Level machine is using extra large trump FX series helix line feeding swirlers.
Further, in above-mentioned collophane beneficiation method, the current cyclosizer described in step b is entered from helix
Expect body cyclone, 74~150 μm of partition size.
Wherein, in above-mentioned collophane beneficiation method, the ore deposit that particle diameter is less than 74 μm in fine fraction ore pulp described in step c is 90
~97wt%.
Wherein, in above-mentioned collophane beneficiation method, fine fraction ore pulp moisture content described in step c is 40~70%, is added water
It is 20~35% to size mixing to ore deposit mass concentration.
Wherein, in above-mentioned collophane beneficiation method, roughing described in step c, scan with selected medicament be sodium carbonate,
Waterglass and fatty acid soaps, wherein sodium carbonate are pH adjuster and shale dispersant, and waterglass is inhibitor, and fatty acid soaps are
Collecting agent.
Wherein, in above-mentioned collophane beneficiation method, the addition of floating agent is described in step c:Fine fraction of ore per ton
2~6kg of sodium carbonate, 1~5kg of waterglass, 0.8~3.5kg of fatty acid soaps are added in slurry.
Wherein, in above-mentioned collophane beneficiation method, flotation temperature described in step c is 18~40 DEG C, and bubbling is used during flotation
Air, aeration quantity is 200~600L/h, and flotation time is 8~15min.
Wherein, in above-mentioned collophane beneficiation method, also scanned described in step c after roughing including the mine tailing to roughing
The step of.
Further, in above-mentioned collophane beneficiation method, described scan obtains concentrate D return to step b and fine fraction ore pulp
Mixing, then carry out roughing.
Wherein, in above-mentioned collophane beneficiation method, the separation of solid and liquid described in step d is by the way of press filtration, press filtration pressure
Power≤0.6MPa, air-dries 2~3min after press filtration.
Beneficial effects of the present invention are:The invention provides a kind of simple and efficient collophane beneficiation method, pass through control
The grinding particle size of collophane, separating coarse-grained level ore pulp and fine fraction ore pulp, coarse fraction ore pulp does not do flotation processing, only to fine fraction
Ore pulp carries out flotation, saves floating agent usage amount, reduces flotation flowsheet, and flotation cost is lower.Beneficiation method operation of the present invention
Simply, equipment requirement is not high, suitably promotes the use of.
Embodiment
The invention provides a kind of collophane beneficiation method, comprise the following steps:
A, collophane slurrying
Collophane is added water levigate to less than 74 μm and accounts for 35~50%, ore pulp, ore pulp moisture content 32~38% is made;
B, the classification of collophane ore pulp
Ore pulp obtained by step a is classified, the coarse fraction ore pulp of particle diameter >=74 μm and 74 μm of particle diameter < particulate is obtained
Level ore pulp;The fine fraction ore pulp moisture content be 40~70%, add water size mixing to ore deposit mass concentration be 20~35%;
C, fine fraction flotation of ore pulp
The fine fraction ore pulp that step b is obtained carries out roughing, and the concentrate A that roughing is obtained obtains concentrate B, concentrate through reverse flotation
B carry out again 2-3 times it is selected, obtain concentrate C;The roughing, reverse flotation and selected medicament are sodium carbonate, waterglass and fat
Sour soap, wherein sodium carbonate are pH adjuster and shale dispersant, and waterglass is inhibitor, and fatty acid soaps are collecting agent;It is per ton
2~6kg of sodium carbonate, 1~5kg of waterglass, 0.8~3.5kg of fatty acid soaps are added in fine fraction ore pulp;Flotation temperature is 18~40
DEG C, bubbling air during flotation, aeration quantity is 200~600L/h, and flotation time is 8~15min;
The mine tailing that roughing is obtained is scanned, and is scanned and is obtained concentrate D return to step b and mixed with fine fraction ore pulp, then carries out
Roughing;
D, concentrate slurry separation of solid and liquid
The coarse fraction ore pulp that step b is obtained merges with the concentrate C that step c is obtained, and carries out separation of solid and liquid, obtains phosphorus ore.
Collophane is a kind of silicates phosphorus ore, and main component is apatite, also containing dolomite, montmorillonite, pyrophillite,
The gangue content such as illite or gibbsite.Described ore dressing, then be the process that useful component apatite is selected from collophane.
During traditional flotation collophane, flotation flowsheet is long, and medicament use is more, and flotation effect is poor.
The key of the present invention is to control valuable mineral in the particle size after ore grinding, collophane to be apatite, and gangue is
The compositions such as carbonate, alumino-silicate and quartz.The nonhomogeneous hardness of apatite and gangue is big, and Mohs' hardness is respectively apatite 5, illiteracy
De- stone 2.0~2.5, pyrophillite 1.0~1.5, illite 2.0~3.0, gibbsite 2.0~2.5, dolomite 3.0~4.0.Cause
This, the relatively difficult mill of apatite grinds the relative enrichment of apatite in rear coarse fraction product.The present invention by substantial amounts of experimental study,
Just find when less than 74 μm when accounting for 35~50%, the apatite in collophane can be separated preferably with gangue, if grinding too
Carefully, the low gangue of hardness can be caused overground, floatation indicators deteriorate, flotation effect is poor;If grinding excessively thick, phosphorus ore and arteries and veins can not be made again
Stone solution is left, and flotation effect is also bad, can all reduce concentrate yield, increases flotation burden.
The beneficiation method of the present invention can be used for sorting the relatively low middle grade silicon calcium collophanite of gangue hardness, due to rock phosphate in powder
Levigate granularity is thick compared with existing level, improves grinding capacity, reduces ore grinding cost.Ore pulp after ore grinding is obtained using cyclonic separation
To coarse fraction and fine-graded ore pulp, coarse fraction concentrate main component is apatite, no longer carries out further flotation, reduces
The treating capacity of flotation operation, has saved flotation cost.The thin pulp granularity stabilization obtained simultaneously by cyclone classification, mineral are overground
Phenomenon is few, is conducive to the stabilization of flotation operation and reduces floating agent consumption, dosing is big, floating during alleviating direct flotation
Select the shortcomings of foam is tacky.
Using the beneficiation method of the present invention, the impurity such as dolomite and alumino-silicate in collophane can be effectively reduced, is carried
High phosphorus ore quality, reduces the difficulty of phosphoric acid production, and phosphorus concentrate coarse size reduces the difficulty of separation of solid and liquid, can be easier to
Moisture content is less than 10% loose phosphorus concentrate, facilitates the transhipment and long-distance transport of phosphorus concentrate, improves Mineral Processing Enterprises and adapts to changeable city
The ability of field.
Explanation is further explained to the embodiment of the present invention below by embodiment, but does not indicate that and sends out this
Bright protection domain is limited in described in embodiment in scope.
Embodiment 1 uses the inventive method flotation collophane
Collophane used in embodiment 1 is selected from Fuquan, Guizhou mining area silicon calcium quality ore and integrates sample ore 1, its primary chemical into
Divide as shown in table 1 below:
The collophane component list of table 1
Index name | P2O5 | Fe2O3 | Al2O3 | SiO2 | MgO |
Content (%) | 27.93 | 1.89 | 2.95 | 13.51 | 1.68 |
Ore dressing is carried out using the inventive method, specific operation process is as follows:
Glue phosphorus is milled to fineness for less than 74 μm and accounts for 35%, using 250 μm of sieves and 74 μm of sieve sieve classifications, -74 μm
Grade carries out flotation, obtains 2, -250 μm of+74 μm of grades of concentrate for concentrate 1, and concentrate 1 and concentrate are 2-in-1 and are qualified concentrate containing ,+250
μm grade returns to ore grinding and regrinded.
Medicament and consumption that fine fraction flotation is used:Tal fibre oil soap 1.2~2.5kg/t. raw ores, 2~6kg/t. of sodium carbonate
Raw ore, waterglass 1~5kg/t. raw ores, phosphoric acid 7~15kg/t. raw ores, stearate soap 0.3~1.5kg/t. raw ores.
The flow that fine fraction flotation is used:Direct flotation slightly sweeps two essences using one, and the progress of roughing foam is selected, scans foam
Roughing is returned, mine tailing is scanned for mine tailing 1;Selected circulation is selected for rear concentrate selected twice is counter, and selected mine tailing returns to roughing,
Anti- choosing uses a flotation, without scan with it is selected, it is counter to select output concentrate to be concentrate 2, it is counter to select output mine tailing as mine tailing
2, mine tailing 1 and mine tailing are 2-in-1 and for true tailings.
Shown in the phosphorus ore composition following 2 obtained after the ore dressing of embodiment 1.
The phosphorus concentrate obtained after the ore dressing of table 2
In embodiment 1, the phosphorus concentrate P after ore dressing2O5Content is 33.60%, and yield reaches 77.83%, P2O5The rate of recovery is
93.70% (phosphorus pentoxide (P in phosphorus concentrate2O5) quality and selected phosphoric acid anhydride in phosphorus ore (P2O5) quality hundred
Divide ratio, computational methods are:In the rate of recovery (ε)=γ × beta/alpha × 100%, formula:γ:Phosphorus concentrate yield (%), refers to concentrate yield
With the mass percent of milling ore amount;β:P in concentrate2O5Grade (%);α:P in raw ore2O5Grade (%)).
Embodiment 2 uses the inventive method flotation collophane
Guizhou Wengan mining area silicon calcium quality ore integrates sample ore 2, and its main chemical compositions is as shown in table 3 below.
The collophane component list of table 3
Index name | P2O5 | Fe2O3 | Al2O3 | SiO2 | MgO |
Content (%) | 25.88 | 1.64 | 3.57 | 19.72 | 1.98 |
Flow is:Ore grinding is -74 μm to fineness and accounts for 38%, using 250 μm of sieves and 74 μm of sieve sieve classifications, -74 μm of grades
Flotation is carried out, 2, -250 μm of+74 μm of grades of concentrate are obtained for concentrate 1, concentrate 1 and concentrate are 2-in-1 and are qualified concentrate containing ,+250 μm of grains
Level returns to ore grinding and regrinded.
Medicament and consumption that fine fraction flotation is used:Tal fibre oil soap 1.2~2.5kg/t. raw ores, 2~6kg/t. of sodium carbonate
Raw ore, waterglass 1~5kg/t. raw ores, phosphoric acid 7~15kg/t. raw ores, stearate soap 0.3~1.5kg/t. raw ores.
The flow that fine fraction flotation is used:Direct flotation slightly sweeps two essences using one, and the progress of roughing foam is selected, scans foam
Roughing is returned, mine tailing is scanned for mine tailing 1;Selected circulation is selected for rear concentrate selected twice is counter, and selected mine tailing returns to roughing,
Anti- choosing uses a flotation, without scan with it is selected, it is counter to select output concentrate to be concentrate 2, it is counter to select output mine tailing as mine tailing
2, mine tailing 1 and mine tailing are 2-in-1 and for true tailings.
The closed circuit result of ore dressing de-magging desiliconization see the table below shown in 4:
The phosphorus concentrate obtained after the ore dressing of table 4
In embodiment 2, the phosphorus ore P after ore dressing2O5Content is 33.21%, and yield reaches 69.28%, P2O5The rate of recovery is
88.87%.
Embodiment 3 uses the inventive method flotation collophane
Guizhou Wengan mining area silicon calcium quality ore integrates sample ore 3, and its main chemical compositions is as shown in table 5 below:
The collophane component list of table 5
Index name | P2O5 | Fe2O3 | Al2O3 | SiO2 | MgO |
Content (%) | 23.67 | 1.38 | 3.23 | 25.72 | 1.74 |
Flow is:Ore grinding is -74 μm to fineness and accounts for 42%, using 250 μm of sieves and 74 μm of sieve sieve classifications, -74 μm of grades
Flotation is carried out, 2, -250 μm of+74 μm of grades of concentrate are obtained for concentrate 1, concentrate 1 and concentrate are 2-in-1 and are qualified concentrate containing ,+250 μm of grains
Level returns to ore grinding and regrinded.
Medicament and consumption that fine fraction flotation is used:Tal fibre oil soap 1.2~2.5kg/t. raw ores, 2~6kg/t. of sodium carbonate
Raw ore, waterglass 1~5kg/t. raw ores, phosphoric acid 7~15kg/t. raw ores, stearate soap 0.3~1.5kg/t. raw ores.
The flow that fine fraction flotation is used:Direct flotation slightly sweeps two essences using one, and the progress of roughing foam is selected, scans foam
Roughing is returned, mine tailing is scanned for mine tailing 1;Selected circulation is selected for rear concentrate selected twice is counter, and selected mine tailing returns to roughing,
Anti- choosing uses a flotation, without scan with it is selected, it is counter to select output concentrate to be concentrate 2, it is counter to select output mine tailing as mine tailing
2, mine tailing 1 and mine tailing are 2-in-1 and for true tailings.
The closed circuit result of ore dressing de-magging desiliconization see the table below shown in 6:
The phosphorus concentrate obtained after the ore dressing of table 6
In embodiment 3, the phosphorus ore P after ore dressing2O5Content is 32.40%, and yield reaches 63.07%, P2O5The rate of recovery is
86.37%.
Comparative example 4 uses the comparative example of conventional direct reverse flotation method flotation collophane
Collophane uses the collophane of embodiment 2, i.e. Guizhou Wengan mining area silicon calcium quality ore to integrate ore deposit in this comparative example
Sample 2.
Flow is:Ore grinding is -74 μm to fineness and accounts for 92%, and beneficiation flowsheet is:Direct flotation slightly sweeps two essences, roughings using one
Foam progress is selected, scans foam and returns to roughing, scans mine tailing for mine tailing 1;Selected circulation carries out anti-for rear concentrate selected twice
Choosing, selected mine tailing returns to roughing, and anti-choosing uses a flotation, without scan with it is selected, it is counter to select output concentrate as product
Phosphorus concentrate, counter to select output mine tailing be mine tailing 2, and mine tailing 1 and mine tailing are 2-in-1 and be true tailings.
Medicament and consumption that flotation is used:Tal fibre oil soap 4.0~4.5kg/t. raw ores, 10~12kg/t. of sodium carbonate raw ores,
Waterglass 8~12kg/t. raw ores, phosphatase 11 5~20kg/t. raw ores, stearate soap 0.8~2.0kg/t. raw ores.
The closed circuit result of ore dressing de-magging desiliconization see the table below shown in 7:
The phosphorus concentrate obtained after the ore dressing of table 7
From the result of comparative example 4:Phosphorus concentrate P after ore dressing2O5Content is 31.14%, and yield reaches 70.48%,
P2O5The rate of recovery is 84.80%.
Compared with Example 2, when grinding particle size is meticulous, phosphorus concentrate P2O5Content is reduced to 31.14% by 33.21%, under
Drop 2.07%;Phosphorus concentrate yield rises to 70.48% by 69.28%, raises 1.20%, P2O5The rate of recovery is by 88.87% reduction
To 84.80%, decline 4.07%.
Claims (10)
1. collophane beneficiation method, it is characterised in that comprise the following steps:
A, collophane slurrying
Collophane is added water levigate to less than 74 μm and accounts for 35~50%, ore pulp is made;
B, the classification of collophane ore pulp
Ore pulp obtained by step a is classified, the coarse fraction ore pulp of particle diameter >=74 μm and 74 μm of particle diameter < Fine fraction of ore is obtained
Slurry;
C, fine fraction flotation of ore pulp
The fine fraction ore pulp that step b is obtained carries out roughing, the concentrate A that roughing is obtained, concentrate A is carried out again 2-3 time it is selected must
To concentrate B, concentrate B concentrate C is obtained through reverse flotation;
The mine tailing that roughing is obtained is scanned, scan obtain concentrate D return ore-sorting system mixed with fine fraction ore pulp, then carry out slightly
Choosing;
D, concentrate slurry separation of solid and liquid
The coarse fraction ore pulp that step b is obtained merges with the concentrate C that step c is obtained, and carries out separation of solid and liquid, obtains product phosphorus essence
Ore deposit.
2. collophane beneficiation method according to claim 1, it is characterised in that:Collophane described in step a it is main into
It is divided at least one of apatite, in addition to dolomite, montmorillonite, pyrophillite, illite or gibbsite.
3. collophane beneficiation method according to claim 1 or 2, it is characterised in that:Ore pulp moisture content is described in step a
32~38%.
4. the collophane beneficiation method according to any one of claims 1 to 3, it is characterised in that:Fine fraction described in step c
Ore pulp moisture content be 40~70%, add water size mixing to ore deposit mass concentration be 20~35%.
5. the collophane beneficiation method according to any one of Claims 1 to 4, it is characterised in that:Roughing described in step c,
It is sodium carbonate, waterglass and fatty acid soaps to scan with selected medicament.
6. the collophane beneficiation method according to any one of Claims 1 to 5, it is characterised in that:In fine fraction ore pulp per ton
Add 2~6kg of sodium carbonate, 1~5kg of waterglass, 0.8~3.5kg of fatty acid soaps.
7. the collophane beneficiation method according to any one of claim 1~6, it is characterised in that:Flotation temperature described in step c
Spend for 18~40 DEG C, bubbling air during flotation, aeration quantity is 200~600L/h, flotation time is 8~15min.
8. the collophane beneficiation method according to any one of claim 1~7, it is characterised in that:, roughing described in step c
The step of also including scanning the mine tailing of roughing afterwards.
9. the collophane beneficiation method according to any one of claim 1~8, it is characterised in that:Described scan obtains concentrate D
Return to step b is mixed with fine fraction ore pulp, then carries out roughing.
10. the collophane beneficiation method according to any one of claim 1~9, it is characterised in that:Consolidating described in step d
Liquid is separated by the way of press filtration, press filtration pressure≤0.6MPa, and 2~3min is air-dried after press filtration.
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Cited By (4)
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CN110449260A (en) * | 2019-09-09 | 2019-11-15 | 平顶山华兴浮选工程技术服务有限公司 | A kind of middle grade monophosphate Collophanite flotation technique |
CN110479481A (en) * | 2019-08-16 | 2019-11-22 | 武汉工程大学 | A kind of floatingization coupling low emission beneficiation method |
CN114534925A (en) * | 2022-03-24 | 2022-05-27 | 贵州川恒化工股份有限公司 | Collophanite collecting agent and preparation method thereof |
CN114632625A (en) * | 2022-03-24 | 2022-06-17 | 贵州川恒化工股份有限公司 | Collophanite flotation method |
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CN105750089A (en) * | 2016-05-09 | 2016-07-13 | 武汉科技大学 | Magnesian collophanite separation method |
CN106269265A (en) * | 2016-08-18 | 2017-01-04 | 中蓝连海设计研究院 | A kind of classification stepped-flotation separation technique processing high alumina high ferro silicon calcium collophanite |
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CN110479481A (en) * | 2019-08-16 | 2019-11-22 | 武汉工程大学 | A kind of floatingization coupling low emission beneficiation method |
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CN114632625B (en) * | 2022-03-24 | 2023-07-18 | 贵州川恒化工股份有限公司 | Flotation method of collophanite |
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