Potassium feldspar grinding equipment

​What is Potassium Feldspar?

Potassium feldspar, also commonly known as orthoclase, belongs to the monoclinic crystal system and is usually fleshy red, white or gray. Density 2.54-2.57g/cm. Hardness 6. Pure feldspar rarely occurs in nature. Even in the mineral known as "potassium feldspar," some albite may be symbiotic or mixed.

Potassium Feldspar
 

What is potassium feldspar used for?

Potassium feldspar powder has the characteristics of low melting point, long melting interval and high melt viscosity. The development and utilization of potassium feldspar can be traced back to the Neolithic Age. People used potassium feldspar and other raw materials to produce a large number of exquisitely painted pottery.

1. In modern industry, it is widely used in ceramic blanks, ceramic glazes, glass, electric porcelain, abrasive materials and other industrial sectors and for potash fertilizer production.

2. The amount of potassium feldspar in the glass industry and ceramic industry accounts for 80-90% of the total, and the rest is used in the chemical industry, glass flux, ceramic body ingredients, ceramic glaze, enamel raw materials, abrasives, glass fiber, Welding electrodes, fertilizers, and other industries.

3. There are also some innovations in the research work of potassium feldspar in material preparation. The main achievements are the preparation of a 13X molecular sieve, a zeolite molecular sieve, and the synthesis of white carbon black.

 

The application of potassium feldspar in the glass industry

The amount of potassium feldspar in the glass industry accounts for about 50% of the total output of potassium feldspar. As one of the glass raw materials, potassium feldspar has the following main functions:

 

1. Potassium feldspar is rich in Al2O3 and has low iron content, which can provide Al2O3 required in glass ingredients, and is more fusible than Al2O3, with low melting temperature and wide melting range, so it can reduce the melting temperature of glass, reduce the amount of soda ash, and The aluminum in the potassium feldspar replaces part of the silicon, which can improve the toughness, strength and resistance to acid and alkali erosion of the glass.

 

2. The process of potassium feldspar melting into the glass is relatively slow, and its crystallization ability is small, which can prevent crystals from precipitating during glass formation and affect normal production or glass defects.

 

3. The viscosity of the glass liquid can be adjusted.

 

The application of potassium feldspar in the ceramic industry

The amount of potassium feldspar in the ceramic industry accounts for about 30% of the total output of potassium feldspar. In the ceramic three-component (ie clay, quartz, feldspar) blank system, in addition to Al2O3 and SiO2, potassium feldspar can also provide alkali metal oxides, which are not only barren raw materials but also solvent raw materials.

 

As a barren raw material, it has the effects of reducing the plasticity and cohesion of clay or green body, reducing shrinkage deformation of green body drying and firing, improving drying performance, and shortening drying time. In glazes, potassium feldspar is the main component that forms the glass phase.

 

Potassium feldspar is used as a solvent component in ceramic blanks, and its main functions are:

 

1. Potassium feldspar begins to melt at 1130 °C to form a viscous melt phase, which can reduce the melting temperature of the green body, which is beneficial to porcelain and lowers the firing temperature.

 

2. Potassium feldspar melt can dissolve part of kaolin decomposition products and quartz particles. The interaction between Al2O3 and SiO2 in the liquid phase promotes the nucleation and growth of mullite crystals, giving the green body mechanical strength and chemical stability.

 

3. Potassium feldspar melt is filled between grains, which helps to compact the green body and reduce pores. The potassium feldspar melt forms the glass matrix of the porcelain after cooling, which improves transparency and helps improve the mechanical strength and electrical properties of the green body.

 

4. The composition of potassium feldspar contains the main oxides SiO2, Al2O3, CaO, MgO, Fe2O3, TiO2, K2O and Na2O in the porcelain blank, so it is used as the main raw material to replace industrial raw materials such as soda ash, pyrophyllite, industrial alumina, etc. Reduced production costs.

 

The ceramic industry is developing rapidly. With the development of special ceramics, the technological change of the ceramic industry has brought forward higher requirements for potassium feldspar. Therefore, it is imperative to speed up the application research of potassium feldspar.

 

Natural potassium feldspar contains K2O, Na2O, SiO2, Al2O3, Fe2O3, and other oxides, and its chemical composition is unstable. Special ceramics have strict requirements on the chemical composition of raw materials, and the chemical stability of potassium feldspar has become the main obstacle to the development of potassium feldspar in the field of technical ceramics.

 

The particle size of the potassium feldspar powder required for special ceramics is in the range of 0.05 to 40 μm, and the particle size is required to be uniform. The focus of the development of the pulverization and separation technology of potassium feldspar will be ultrafine pulverization and fine classification technology.

 

Fertilizer industry

The chemical properties of potassium feldspar are extremely stable. Except for hydrofluoric acid, it is hardly decomposed by acid and alkali at normal pressure and normal temperature.

The potassium oxide contained in it cannot be directly absorbed by plants as a potassium-containing fertilizer. In order to make potassium feldspar into a useful potassium resource, potassium oxide is changed into water-soluble or citric acid-soluble, and various technological studies have been carried out on the use of potassium feldspar to produce potassium fertilizer.

Smelting method, autoclave method, open leaching and closed constant temperature method, thermal decomposition water immersion method, thermal method to produce citric acid-soluble potassium, acid decomposition method, sintering method, low temperature decomposition method, microorganism method, etc.

 

How to choose potassium feldspar grinding equipment?

The selection of potassium feldspar grinding equipment depends on the fineness of the feldspar powder to be processed. In addition to Raymond mill and ball mill, the commonly used potassium feldspar grinding equipment also includes micro powder grinding mill and ultra-fine vertical mill suitable for the processing of ultra-fine powder above 150 mesh. The following will introduce these two potassium feldspar grinding mills in detail.
 

1. HGM micro powder grinding mill for potassium feldspar

HGM micro powder grinding mill also called HGM ultrafine grinding mill, HGM three-ring medium-speed mill and 21r/24r/28r grinding mill.
Discharge particle size: 150-3000 mesh, D97<2500 mesh, D50<3μm
Production capacity: 0.5-45 t/h
Advantages:
1. High cost performance.
2. Low maintenance costs.
3. It can grind a wide range, from coarse powder to fine powder to ultra-fine powder.
4. It is suitable for the fine powder requirements of various industries. Parameters:

Model	HGM80	HGM80A	HGM90L	HGM100L-Ⅱ	HGM100P	HGM125L	HGM1680L
Ring Diameter(mm)	800	800	900	1000	1000	1250	1680
Ring Number (PCS)	3	3	4	4	4	4	4
Input Size (mm)	≤10	≤10	≤10	≤15	≤15	≤20	≤20
Adjustable range of finished product (mesh)	150-3000	150-3000	150-3000	150-3000	150-3000	150-3000	150-3000
Capacity (t/h)	0.5-5.5	0.5-5.5	0.8-6.5	1.2-10	1.2-11	2.5-20	5-45
Outlet Size L*W*H (mm)	8605*4139*6050	10454*3393*6626	11735*3952*7525	14507*3633*7562	14362*4200*7562	19261*4406*8591	25067*5414*9007
Main motor power (kw)	75	75	55*2	132/75*2	132/75*2	185	315

 
 

2.CLUM ultrafine vertical roller grinding mill for potassium feldspar

Discharge particle size: 400-3000 mesh, D97<3000 mesh, D50<2μm
Production capacity:
Advantages:
1. High 2 micron powder content.
2. Good sphericity of the produced powder.
3. High whiteness of calcium carbonate powder.
4. High efficiency: production of ultra-fine powder of the same fineness, less power consumption, higher output.
5. Stable performance.stable equipment.
6. High profit.
7. It is suitable for industries that require high powder whiteness and particle size.
   
Parameters:

ModelItem	CLUM1425	CLUM1632	CLUM1736
Working Diameters（mm）	1400	1600	1700
Number of rollers（pieces）	3	3	3
Number of classifier（pieces）	6	6	8
Power of classifier（Kw）	6X15	6X22	8X22
Main unit power （Kw）	220-250	315-355	355-410
Blower power（Kw）	180-200	250-280	325-355
Feed size （mm）	＜10mm	＜10mm	＜10mm
Moisture of feeding material	＜3%	＜3%	＜3%
Less than 2μm=30%  output（t/h）	9-12	12-16	14-18
Less than 2μm=45%  output（t/h）	5.5-7.5	7-9	10-12
Less than 2μm=60% output（t/h）	3-4	/	/

Material: base on calcite
Particle size distribution: measured by microlayer diffraction particle size analyzer in British Malvern 3000 instruments

CLUM1425 TECHNICAL PARAMETER

Output (t/h) Item	10.0-12.0	7.5-9.5	6.0-8.0	4.5-6.5	3.0-4.0
specific surface area(cm²/g)	11000±500	13500±500	15000±500	17000±500	19000±1000
325mesh remaining amount (%)	0.015	0.015	0.01	0	0
less than 2μm powder content (%)	30	40	45	50	60
Median particle diameter D50 (um)	5.2	3.0	2.5	2	1.4
General name(mesh)	600	800	1250	2000	2500
Particle size distribution D97 (um)	30	25	20	15	9
Particle size cut point D100 (um)	80	48	38	28	18
Moisture content (%)	<0.3%	<0.3%	<0.3%	<0.3%	<0.3%
Energy consumption (KW/T)	38-40	40-50	47-53	50-53	110-125

CLUM1632 TECHNICAL PARAMETER

Output (t/h) Item	12.5-14.5	9.5-11.5	7.5-9.5	6.0-8.0
specific surface area(cm²/g)	11000±500	13500±500	15000±500	17000±500
325mesh remaining amount (%)	0.015	0.015	0.01	0
less than 2μm powder content (%)	30	40	45	50
Median particle diameter D50 (um)	5.2	3.0	2.5	2.0
General name(mesh)	600	800	1250	2000
Particle size distribution D97 (um)	30	25	20	15
Particle size cut point D100 (um)	80	48	38	28
Moisture content (%)	<0.3%	<0.3%	<0.3%	<0.3%
Energy consumption (KW/T)	38-40	40-50	47-53	50-53

CLUM1736 TECHNICAL PARAMETER

Output (t/h) Item	15.0-18.0	11.5-13.5	9.0-11.0
specific surface area(cm²/g)	11000±500	13500±500	15000±500
325mesh remaining amount (%)	0.015	0.015	0.01
less than 2μm powder content (%)	30	40	45
Median particle diameter D50 (um)	5.2	3.0	2.5
General name(mesh)	600	800	1250
Particle size distribution D97 (um)	30	25	20
Particle size cut point D100 (um)	80	48	38
Moisture content (%)	<0.3%	<0.3%	<0.3%
Energy consumption (KW/T)	38-40	40-50	47-53

 

Potassium feldspar powder grinding mill supplier

SBM Ultrafine Powder Technology Co., Ltd.  is one of the premier manufacturers for equipment in the mining, grinding, coating,packing, recycling and process industries. 

With SBM Ultrafine Powder Technology unique knowledge and innovative solutions, SBM helps many customers improve their operational efficiency, reduce risks and increase profitability.


SBM Ultrafine Powder Technology products can be divided into :
crushing equipment, grinding   equipment,  drying equipment, screening equipment, conveying equipment and auxiliary equipment. 

SBM Ultrafine Powder Technology products have passed the quality system certification of ISO9001:2008, and the European CE certificate. 

SBM sincerely welcome local distributors join us together to shape SBM Ultrafine Powder Technology brand and delivery high value-added equipment products in the global market around world. 

SBM Ultrafine Powder Technology is an international high-tech enterprise which integrates the research and development, production and sales.

 

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Further Reading:

Potassium feldspar vs Plagioclase feldspar

When identifying feldspar, special attention should be paid to the observation of twin crystals. When the specimen is rotated, it is found that half of the feldspar cleavage surface is reflective and half is non-reflective, which is Casbah twin; Potassium feldspar often has Casbah twin crystals, while plagioclase often has polylamellar twin crystals. This is the most important sign to distinguish potash feldspar and plagioclase.

Potassium feldspar:

Potassium feldspar includes orthoclase, microcline feldspar, striped feldspar, feldspar, etc. It is mainly orthoclase and microcline feldspar produced in intrusive rocks, and can be feldspar in epigenetic and extrusive rocks . Striped feldspar is the product of the intersection of orthoclase or microplagioclase and albite, of which orthoclase or microcline feldspar is more than albite. Color is an important indicator to identify potassium feldspar. Potassium feldspar is usually Flesh red, but also purple, white, gray-white, and even gray-black. The color of potassium feldspar will change during the weathering process, and the red meat can become gray-white, and the gray-white can also become red. It is also often fleshy red. Therefore, the color cannot be used as a characteristic sign for the identification of potassium feldspar. The potassium feldspar and microplagioclase produced in plutonic rocks often appear as granular crystals. When phenocrysts are formed in rocks, they are often plate-like and plate-columnar euhedral crystals. When identifying feldspar in the field, special attention should be paid to the observation of twin crystals. This is Kasbah twin; when there is interphase reflection, it is poly-lamellar twin. Potassium feldspar often has Kasbah twin, while plagioclase often has poly-sheet twin. This is the difference between potassium feldspar and The most important sign of plagioclase. If you see root-like veinlets on large potassium feldspar crystals, and the color of the veinlets is lighter, it is striped feldspar. When potassium feldspar is weathered, it is often formed White earthy kaolinite.

Plagioclase:

Plagioclase is widely found in all kinds of magmatic rocks. The type and content of plagioclase are very important for the classification and identification of magmatic rocks. Dark gray to grayish white; acid plagioclase is lighter in color, and can be grayish white or fleshy red. The basic plagioclase is subject to sodium zoisite, and its alteration products often have a green hue; acid plagioclase is easy to sericitize , and its weathering products are mostly gray-white. In basic epidiagenetic or extrusive rocks (such as diabase and basalt), it is difficult to identify plagioclase due to its darker color and fine crystals. At this time, half of it can be collected. In the observation of weathered specimens, since the color of plagioclase becomes lighter after weathering, it is easy to distinguish it from dark minerals. Polycrystalline double crystal is an important identification mark of plagioclase. Rotate the specimen in different directions until the crystal is seen in the field or with a magnifying glass. A group of parallel light and dark straight lines or broken lines appear on the surface or cleavage surface, which is the double crystal grain. In general, the double crystal grain of the acid plagioclase is dense and straight, while the double crystal grain of the basic plagioclase is rarer and not straight enough.