CN109019620A - A kind of method of low-quality potash feldspar deferrization purification - Google Patents
A kind of method of low-quality potash feldspar deferrization purification Download PDFInfo
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- CN109019620A CN109019620A CN201811013844.4A CN201811013844A CN109019620A CN 109019620 A CN109019620 A CN 109019620A CN 201811013844 A CN201811013844 A CN 201811013844A CN 109019620 A CN109019620 A CN 109019620A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B33/00—Silicon; Compounds thereof
- C01B33/20—Silicates
- C01B33/26—Aluminium-containing silicates, i.e. silico-aluminates
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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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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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- C01P2006/80—Compositional purity
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Abstract
The present invention provides a kind of method of low-quality potash feldspar deferrization purification, it is related to mineral processing technology field, the method of low-quality potash feldspar deferrization purification of the invention is the following steps are included: (1) prepares potassium feldspar emery dust, (2) potassium feldspar fine powder is prepared, (3) acidleach removes iron, (4) potassium feldspar is rinsed, (5) handle the first flushing liquor, and (6) handle the second cleaning solution and (7) are dry；The present invention efficiently solves the problems, such as that iron-content is high in low-quality potassium feldspar, the feldspar in powder of high-quality and high-purity is obtained by a series of processing, the purifying technique can not only meet requirement of the industries such as domestic glass, ceramics, enamel to high whiteness feldspar emery dust, while also have the characteristics that high production efficiency, low energy consumption, harmless pollution-free.
Description
[technical field]
The present invention relates to mineral processing technology fields, and in particular to a kind of method of low-quality potash feldspar deferrization purification.
[background technique]
Feldspar be it is a kind of containing calcium, sodium, potassium aluminium silicate mineral, there are many kinds of it, as potassium feldspar, albite, calcium are long
Stone, glassy feldspar etc..They all have glassy lustre, and color is varied, have it is colourless, have white, yellow, pink, green,
Grey, black etc..Some are transparent, some are translucent.Feldspar itself should be it is colorless and transparent, why coloured or endless full impregnated
It is bright, it is because containing other impurities.Some at bulk, some at plate, some are at column or needle-shaped etc..Wherein potassium feldspar is one
The important raw material of industry of kind, it is widely used, it is mainly used for the industry such as ceramics, glass, enamel.But in natural potassium feldspar ore usually
Containing mica, tourmaline, quartz, weak magnetism mineral etc., some weathering ores also contain kaolin, these impurity components are multiple
It is miscellaneous, so that potassium feldspar is restricted in the application of many industrial circles, therefore need to have by the way that the means such as physics, chemical treatment are selected
With mineral, impurity component is removed, the content of harmful element is reduced, to reach the technical indicator of industrial utilization.
The producer of domestic production potassium feldspar raw material is to remove magnetic irony using the method for multi-stage magnetic separation mostly at present.In recent years
Carry out an urgent demand of rapid development and the environmental protection with novel building glass, architectural pottery and daily water-consumption forecasting, it is right
Grade and the iron-content requirement of potassium feldspar are higher and higher, and existing technology is difficult to meet the needs of development, this is just to potassium feldspar
More stringent requirements are proposed for deep process technology and technique.
[summary of the invention]
In view of this, the purpose of the present invention is to provide a kind of method of low-quality potash feldspar deferrization purification, the present invention has
Effect solves the problems, such as that iron-content is high in low-quality potassium feldspar, and the potassium for obtaining high-quality and high-purity by a series of processing is long
Mountain flour, the purifying technique can not only meet requirement of the industries such as domestic glass, ceramics, enamel to high whiteness feldspar emery dust, together
When also have the characteristics that high production efficiency, low energy consumption, harmless pollution-free.
In order to solve the above-mentioned technical problem, present invention employs the following technical solutions:
A kind of method of low-quality potash feldspar deferrization purification, comprising the following steps:
(1) it prepares potassium feldspar emery dust: first carrying out obtaining potassium feldspar rough concentrate, low intensity magnetic separation magnetic except iron using weak magnetic separation process
Selecting intensity is 120-200KA/M；Potassium feldspar rough concentrate is rolled on granite edge runner, is rinsed with water, goes after weeding out fine powder
Fall surface mica；
(2) prepare potassium feldspar fine powder: the potassium feldspar grains of sand after water rinses, which add water again, the granite rolling of surrounding edge with block
Machine is milled, and is flowed out with water through sieve, is obtained potassium feldspar fine powder；
(3) acidleach removes iron: the potassium feldspar fine powder for taking step (2) to obtain adds water according to solid-to-liquid ratio 2:1, according to every 100g potassium
Feldspar fine powder be added 55-65ml mixed acid ratio be added mixed acid, 95-110 DEG C at a temperature of stirring and constant temperature 4-5h, make
Abundant reaction, so as to make wherein solid di-iron trioxide be converted into soluble ferric sulfate and iron chloride；
(4) it rinses potassium feldspar: the material in step (3) being filtered with filter press, filter cake is obtained, uses circulating water flushing
Filter cake 4-6 times collects the first flushing liquor after rinsing filter cake in the first neutralization pond, and the first flushing liquor is highly acid yellow liquid
Body；Then it uses circulating water flushing above-mentioned filter cake 4-5 times again, collects the second flushing liquor in the second neutralization pond, the second flushing liquor is
Faintly acid colourless liquid；
(5) it handles the first flushing liquor: green stone being laid in the first neutralization pond of step (4), led into the first neutralization pond
While entering air, it is 9.5-10.5 that ammonium hydroxide, which is added, and adjusts pH value, after 30-40min is mixed, stands 10-20min, will be upper
The clear liquid of layer flows into sedimentation basin, and filter cloth is placed in sedimentation basin, filters out colourless alkaline clear liquid；
(6) it handles the second cleaning solution: the colourless alkaline clear liquid filtered out in step (5) sedimentation basin is passed through the of step (4)
In two neutralization ponds, pH value is adjusted to and is used to precipitate iron ion after 8-9, the water after precipitating iron ion is put into conditioning tank, in
It after arriving neutrality, is concentrated with multi-stage reverse osmosis equipment, the clear water that reverse osmosis separation goes out can be reused for flush acid leaching iron
The recirculated water of potassium feldspar afterwards；
(7) dry: to through step (4), treated, and filter cake is dried, to be made except the feldspar in powder after iron.
In the present invention, further, the hydrochloric acid and concentration that the mixed acid in the step (3) is 25-35% by concentration are
The sulfuric acid of 45-55% mixes composition according to the volume ratio of 10-20:28-35.
In the present invention, further, the solid-to-liquid ratio of filter cake and recirculated water is 1:3-5 in the step (4).
In the present invention, further, temperature is maintained at 105 DEG C in the step (3).
In the present invention, further, constant temperature time is 4.5h in the step (3).
In the present invention, further, the sulfuric acid that the hydrochloric acid and concentration that the mixed acid is 30% by concentration are 50% according to
The volume ratio of 15:31 mixes composition.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
1. low-quality potash feldspar deferrization method of purification of the invention, it is high to efficiently solve iron-content in low-quality potassium feldspar
Problem obtains the feldspar in powder of high-quality and high-purity by a series of processing, which can not only meet the country
Requirement of the industries such as glass, ceramics, enamel to high whiteness feldspar emery dust, at the same also have high production efficiency, low energy consumption, harmless nothing
The features such as pollution.
2. de_ironing refinement method of the invention is handled first against in low-quality potassium feldspar containing mica, in potassium feldspar
Containing mica, and iron-content height is caused by mica, since mica has the characteristics that hardness is low, light specific gravity, according to these spies
Point, the present invention first first roll potassium feldspar on granite edge runner, and the grains of sand after weeding out fine powder are rinsed with water, and remove surface
Mica, the potassium feldspar grains of sand after rinsing add water to have the granite edge runner of surrounding edge to mill with block again, with water through sieve stream
Out, potassium feldspar is milled into fine sand grain and precipitates to obtain potassium feldspar fine powder, then carries out further removing iron, acidleach process by acidleach
Middle iron oxides impurities are dissolved in mixed acid, to achieve the purpose that effectively to remove iron, are then carried out clearly with recirculated water to potassium feldspar
It washes, strongly acidic solution and weakly acidic solution separate collection is first handled the first flushing liquor, be by green stone and ammonium hydroxide
Inorganic agent has effectively neutralized the acid acid in flushing liquor, has eliminated flushing liquor color, combined wastewater treatment using green stone and ammonium hydroxide
Time is short；Then the colourless alkaline clear liquid that obtains after the first flushing liquor will be handled as the raw material for handling the second flushing liquor, by the
Two flushing liquors are neutralized to after neutrality, are concentrated with multi-stage reverse osmosis equipment, and the clear water that reverse osmosis separation goes out can be reused for rushing
Acidleach is washed except the recirculated water of the potassium feldspar after iron；It can be while sufficiently removing iron, since flushing liquor recycles in whole system
It uses, thus whole system no wastewater discharge, reach no effuent discharge, it is not only environmentally friendly also largely to reduce into
This.
[specific embodiment]
The following examples can help those skilled in the art that the present invention is more fully understood, but cannot be with any
Mode limits the present invention.
Embodiment 1
A kind of method of low-quality potash feldspar deferrization purification provided in this embodiment, comprising the following steps:
(1) it prepares potassium feldspar emery dust: first carrying out obtaining potassium feldspar rough concentrate, low intensity magnetic separation magnetic except iron using weak magnetic separation process
Selecting intensity is 120KA/M；Potassium feldspar rough concentrate is rolled on granite edge runner, is rinsed with water after weeding out fine powder, removes table
Face mica；
(2) prepare potassium feldspar fine powder: the potassium feldspar grains of sand after water rinses, which add water again, the granite rolling of surrounding edge with block
Machine is milled, and is flowed out with water through sieve, is obtained potassium feldspar fine powder；
(3) acidleach removes iron: the potassium feldspar fine powder for taking step (2) to obtain adds water according to solid-to-liquid ratio 2:1, according to every 100g potassium
Mixed acid is added in the ratio that 55ml mixed acid is added in feldspar fine powder, and the hydrochloric acid and concentration that mixed acid is 25% by concentration are 45%
Sulfuric acid according to 5:14 volume ratio mix composition, 95 DEG C at a temperature of stirring and constant temperature 4h, be allowed to sufficiently react, to make it
In solid di-iron trioxide be converted into soluble ferric sulfate and iron chloride；
(4) it rinses potassium feldspar: the material in step (3) being filtered with filter press, filter cake is obtained, uses circulating water flushing
Filter cake 4 times, the solid-to-liquid ratio of filter cake and recirculated water is 1:3, collects the first flushing liquor after rinsing filter cake in the first neutralization pond, the
One flushing liquor is highly acid yellow liquid；Then it uses the above-mentioned filter cake of circulating water flushing 4 times again, collects the second flushing liquor in second
In pond, the second flushing liquor is faintly acid colourless liquid；
(5) it handles the first flushing liquor: green stone being laid in the first neutralization pond of step (4), led into the first neutralization pond
While entering air, it is 9.5 that ammonium hydroxide, which is added, and adjusts pH value, after 30min is mixed, 10min is stood, by the clear liquid in upper layer
It flows into sedimentation basin, filter cloth is placed in sedimentation basin, filter out colourless alkaline clear liquid；
(6) it handles the second cleaning solution: the colourless alkaline clear liquid filtered out in step (5) sedimentation basin is passed through the of step (4)
It in two neutralization ponds, is used to precipitate iron ion after pH value is adjusted to 8, the water after precipitating iron ion is put into conditioning tank, is neutralized
It to after neutrality, is concentrated with multi-stage reverse osmosis equipment, after the clear water that reverse osmosis separation goes out can be reused for flush acid leaching iron
Potassium feldspar recirculated water；
(7) dry: to through step (4), treated, and filter cake is dried, to be made except the feldspar in powder after iron.
Embodiment 2
A kind of method of low-quality potash feldspar deferrization purification provided in this embodiment, comprising the following steps:
(1) it prepares potassium feldspar emery dust: first carrying out obtaining potassium feldspar rough concentrate, low intensity magnetic separation magnetic except iron using weak magnetic separation process
Selecting intensity is 160KA/M；Potassium feldspar rough concentrate is rolled on granite edge runner, is rinsed with water after weeding out fine powder, removes table
Face mica；
(2) prepare potassium feldspar fine powder: the potassium feldspar grains of sand after water rinses, which add water again, the granite rolling of surrounding edge with block
Machine is milled, and is flowed out with water through sieve, is obtained potassium feldspar fine powder；
(3) acidleach removes iron: the potassium feldspar fine powder for taking step (2) to obtain adds water according to solid-to-liquid ratio 2:1, according to every 100g potassium
Mixed acid is added in the ratio that 60ml mixed acid is added in feldspar fine powder, and the hydrochloric acid and concentration that mixed acid is 30% by concentration are 50%
Sulfuric acid according to 15:31 volume ratio mix composition, 105 DEG C at a temperature of stirring and constant temperature 4.5h, be allowed to sufficiently react, so as to
Make wherein solid di-iron trioxide be converted into soluble ferric sulfate and iron chloride；
(4) it rinses potassium feldspar: the material in step (3) being filtered with filter press, filter cake is obtained, uses circulating water flushing
Filter cake 5 times, the solid-to-liquid ratio of filter cake and recirculated water is 1:4, collects the first flushing liquor after rinsing filter cake in the first neutralization pond, the
One flushing liquor is highly acid yellow liquid；Then it uses the above-mentioned filter cake of circulating water flushing 4 times again, collects the second flushing liquor in second
In pond, the second flushing liquor is faintly acid colourless liquid；
(5) it handles the first flushing liquor: green stone being laid in the first neutralization pond of step (4), led into the first neutralization pond
While entering air, it is 10 that ammonium hydroxide, which is added, and adjusts pH value, after 35min is mixed, 15min is stood, by the clear liquid in upper layer
It flows into sedimentation basin, filter cloth is placed in sedimentation basin, filter out colourless alkaline clear liquid；
(6) it handles the second cleaning solution: the colourless alkaline clear liquid filtered out in step (5) sedimentation basin is passed through the of step (4)
It in two neutralization ponds, is used to precipitate iron ion after pH value is adjusted to 8.5, the water after precipitating iron ion is put into conditioning tank, in
It after arriving neutrality, is concentrated with multi-stage reverse osmosis equipment, the clear water that reverse osmosis separation goes out can be reused for flush acid leaching iron
The recirculated water of potassium feldspar afterwards；
(7) dry: to through step (4), treated, and filter cake is dried, to be made except the feldspar in powder after iron.
Embodiment 3
A kind of method of low-quality potash feldspar deferrization purification provided in this embodiment, comprising the following steps:
(1) it prepares potassium feldspar emery dust: first carrying out obtaining potassium feldspar rough concentrate, low intensity magnetic separation magnetic except iron using weak magnetic separation process
Selecting intensity is 200KA/M；Potassium feldspar rough concentrate is rolled on granite edge runner, is rinsed with water after weeding out fine powder, removes table
Face mica；
(2) prepare potassium feldspar fine powder: the potassium feldspar grains of sand after water rinses, which add water again, the granite rolling of surrounding edge with block
Machine is milled, and is flowed out with water through sieve, is obtained potassium feldspar fine powder；
(3) acidleach removes iron: the potassium feldspar fine powder for taking step (2) to obtain adds water according to solid-to-liquid ratio 2:1, according to every 100g potassium
Mixed acid is added in the ratio that 65ml mixed acid is added in feldspar fine powder, and the hydrochloric acid and concentration that mixed acid is 35% by concentration are 55%
Sulfuric acid according to 4:7 volume ratio mix composition, 110 DEG C at a temperature of stirring and constant temperature 5h, be allowed to sufficiently react, to make it
In solid di-iron trioxide be converted into soluble ferric sulfate and iron chloride；
(4) it rinses potassium feldspar: the material in step (3) being filtered with filter press, filter cake is obtained, uses circulating water flushing
Filter cake 6 times, the solid-to-liquid ratio of filter cake and recirculated water is 1:5, collects the first flushing liquor after rinsing filter cake in the first neutralization pond, the
One flushing liquor is highly acid yellow liquid；Then it uses the above-mentioned filter cake of circulating water flushing 5 times again, collects the second flushing liquor in second
In pond, the second flushing liquor is faintly acid colourless liquid；
(5) it handles the first flushing liquor: green stone being laid in the first neutralization pond of step (4), led into the first neutralization pond
While entering air, it is 10.5 that ammonium hydroxide, which is added, and adjusts pH value, after 40min is mixed, 20min is stood, by the clear liquid in upper layer
Body flows into sedimentation basin, and filter cloth is placed in sedimentation basin, filters out colourless alkaline clear liquid；
(6) it handles the second cleaning solution: the colourless alkaline clear liquid filtered out in step (5) sedimentation basin is passed through the of step (4)
It in two neutralization ponds, is used to precipitate iron ion after pH value is adjusted to 9, the water after precipitating iron ion is put into conditioning tank, is neutralized
It to after neutrality, is concentrated with multi-stage reverse osmosis equipment, after the clear water that reverse osmosis separation goes out can be reused for flush acid leaching iron
Potassium feldspar recirculated water；
(7) dry: to through step (4), treated, and filter cake is dried, to be made except the feldspar in powder after iron.
Comparative example 1
(1) it prepares potassium feldspar emery dust: first carrying out obtaining potassium feldspar rough concentrate, low intensity magnetic separation magnetic except iron using weak magnetic separation process
Selecting intensity is 160KA/M；Potassium feldspar rough concentrate is rolled on granite edge runner, is rinsed with water after weeding out fine powder, removes table
Face mica；
(2) prepare potassium feldspar fine powder: the potassium feldspar grains of sand after water rinses, which add water again, the granite rolling of surrounding edge with block
Machine is milled, and is flowed out with water through sieve, is obtained potassium feldspar fine powder；
(3) mica is milled into water slurry and flows into second pond precipitating with water；Potassium feldspar is milled into the grains of sand, goes out with water
It is deposited in first pond, potassium feldspar is dehydrated or is dried through centrifuge, air-dried.
Compliance test result
Illustrate practical value of the invention in order to clearer, applicant does following tests:
By following four groups of potassium feldspars after de_ironing refinement is handled, iron content is measured, and record data such as 1 institute of table
Show:
First group: the method for potash feldspar deferrization purification described in embodiment 1；
Second group: the method for potash feldspar deferrization purification as described in example 2；
Third group: the method for potash feldspar deferrization purification described in embodiment 3；
4th group: the method for the purification of potash feldspar deferrization described in comparative example 1.
1 four groups of potassium feldspars of table iron content contrast table before and after the processing
| Group | Low-quality potassium feldspar iron content amount of element (%) before handling | Potassium feldspar iron content (%) after processing |
| First group | 1.52% | 0.12% |
| Second group | 1.53% | 0.10% |
| Third group | 1.51% | 0.11% |
| 4th group | 1.50% | 0.32% |
According to 1 data of table it is found that the method that the potash feldspar deferrization of 1-3 of the embodiment of the present invention purifies can to effectively remove potassium long
Ferro element in stone, the method for removing iron being compared in comparative example have obtained the feldspar in powder of higher quality and high-purity.
Although above the present invention is described in detail with a general description of the specific embodiments,
On the basis of the present invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Cause
This, these modifications or improvements, fall within the scope of the claimed invention without departing from theon the basis of the spirit of the present invention.
Claims (6)
1. a kind of method of low-quality potash feldspar deferrization purification, which comprises the following steps:
(1) it prepares potassium feldspar emery dust: first carrying out obtaining potassium feldspar rough concentrate except iron using weak magnetic separation process, low intensity magnetic separation magnetic separation is strong
Degree is 120-200KA/M；Potassium feldspar rough concentrate is rolled on granite edge runner, is rinsed with water after weeding out fine powder, removes table
Face mica；
(2) prepare potassium feldspar fine powder: the potassium feldspar grains of sand after water rinses add water again with build have the granite edge runner of surrounding edge into
Row is milled, and is flowed out with water through sieve, is obtained potassium feldspar fine powder；
(3) acidleach removes iron: the potassium feldspar fine powder for taking step (2) to obtain adds water according to solid-to-liquid ratio 2:1, according to every 100g potassium feldspar
Fine powder be added 55-65ml mixed acid ratio be added mixed acid, 95-110 DEG C at a temperature of stirring and constant temperature 4-5h, be allowed to fill
Point reaction, so as to make wherein solid di-iron trioxide be converted into soluble ferric sulfate and iron chloride；
(4) it rinses potassium feldspar: the material in step (3) being filtered with filter press, filter cake is obtained, with circulating water flushing filter cake
4-6 times, the first flushing liquor after rinsing filter cake is collected in the first neutralization pond, and the first flushing liquor is highly acid yellow liquid；So
It uses circulating water flushing above-mentioned filter cake 4-5 times again afterwards, collects the second flushing liquor in the second neutralization pond, the second flushing liquor is faintly acid
Colourless liquid；
(5) it handles the first flushing liquor: green stone being laid in the first neutralization pond of step (4), be passed through sky into the first neutralization pond
While gas, it is 9.5-10.5 that ammonium hydroxide, which is added, and adjusts pH value, after 30-40min is mixed, stands 10-20min, and upper layer is clear
Clear liquid flows into sedimentation basin, and filter cloth is placed in sedimentation basin, filters out colourless alkaline clear liquid；
(6) it handles the second cleaning solution: the colourless alkaline clear liquid filtered out in step (5) sedimentation basin is passed through in the second of step (4)
In pond, pH value is adjusted to and is used to precipitate iron ion after 8-9, the water after precipitating iron ion is put into conditioning tank, neutralization is arrived
It after neutrality, is concentrated with multi-stage reverse osmosis equipment, after the clear water that reverse osmosis separation goes out can be reused for flush acid leaching iron
The recirculated water of potassium feldspar；
(7) dry: to through step (4), treated, and filter cake is dried, to be made except the feldspar in powder after iron.
2. a kind of method of low-quality potash feldspar deferrization purification according to claim 1, which is characterized in that the step
(3) sulfuric acid that the hydrochloric acid and concentration that the mixed acid in is 25-35% by concentration are 45-55% according to 10-20:28-35 volume
It is formed than mixing.
3. a kind of method of low-quality potash feldspar deferrization purification according to claim 1, which is characterized in that the step
(4) solid-to-liquid ratio of filter cake and recirculated water is 1:3-5 in.
4. a kind of method of low-quality potash feldspar deferrization purification according to claim 1, which is characterized in that the step
(3) temperature is maintained at 105 DEG C in.
5. a kind of method of low-quality potash feldspar deferrization purification according to claim 1, which is characterized in that the step
(3) constant temperature time is 4.5h in.
6. a kind of method of low-quality potash feldspar deferrization purification according to claim 2, which is characterized in that the mixed acid
The sulfuric acid that the hydrochloric acid and concentration for being 30% by concentration are 50% is formed according to the volume ratio mixing of 15:31.
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| CN103506215A (en) * | 2013-06-09 | 2014-01-15 | 中钢集团马鞍山矿山研究院有限公司 | Beneficiation process for quality improvement and iron removal of feldspar ores |
| CN103482784A (en) * | 2013-09-17 | 2014-01-01 | 孔建美 | Method for processing waste water of acid leaching and deironing of potassium feldspar |
| CN103540744A (en) * | 2013-10-31 | 2014-01-29 | 洛阳氟钾科技有限公司 | Potash feldspar iron removal process |
| CN107416845A (en) * | 2017-08-25 | 2017-12-01 | 陕西科技大学 | A kind of method that potassium feldspar produces white silica gel |
| CN108083288A (en) * | 2018-02-24 | 2018-05-29 | 洛南县大秦钾矿有限公司 | A kind of method of low-quality potash feldspar deferrization purification |
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Application publication date: 20181218 |