Zeolite family

December 14, 2019

And the feldspar, feldspartoids compared zeolite mineral group aluminosilicate aqueous shelf-like, generally the formula A m X p O 2p · nH 2 O, where A = Na, Ca, K, and a small amount of Ba , Sr, Mg, etc.; X = Si, Al, Al: Si ≤ 1 at a tetrahedral position (about 1:5 to 1:1). The chemical composition of the zeolite family minerals can vary over a wide range such that many zeolites can only give approximate chemical formulas. The crystal structure of zeolite differs greatly from other framework silicates. The zeolite structure has broad voids and wide channels, and is occupied by Na, Ca, K plasma and water molecules, zeolite water. In the zeolite structure, there are secondary structural units SBU (secondary building units), which are derived from the original structural unit [SiO 4 ], [AlO 4 ] tetrahedron. Regardless of the shape of the tetrahedron in the structure, only the positions of Si or Al in each tetrahedron are connected to each other to form secondary structural units, forming various simple rings or double rings or more complicated structural units. These secondary structural units form a polyhedral space of a certain shape in the crystal structure, constituting a so-called cage. Adjacent cages can be joined to each other by secondary structures to form a variety of different forms of channels. There are three types of this channel system:

(1) The channels in each direction of the one-dimensional channel are not in communication with each other. Such as the channel of analcite, parallel {111}.

(2) A two-dimensional channel, such as a channel system in mordenite, is formed by interconnecting two channels of parallel c-axis and b-axis.

(3) Channels in which three-dimensional channels communicate with each other in three directions. Divided into two types of equal diameter and unequal diameter. For example, the channel in the chabazite is a three-dimensional equal channel system, and the calcium cross zeolite is a three-dimensional unequal channel system.

The difference between the various zeolite structures is that they hold the cage in different shapes and channel systems. The crystal structure of zeolite determines its wide range of industrial applications:

(1) Zeolite as an ion exchange material: cations (Na, K, Ca, etc.) located in the cage and channel, due to weak contact with the silica-alumina backbone, can be used by other cations (such as Mg, Sr, Ba, Cu, Zn) , Ni, Ag, La, etc.) are replaced without breaking the crystal lattice. And since the cation does not completely fill the void, an unequal number of ion exchanges like Ca 2+ (Na + , K + ) can occur. Therefore, Ca 2+ is exchanged by 2Na + provided by zeolite, so that the hard water with high Ca 2+ content is softened, and seawater can be desalinated or extracted from seawater, which can be used for wastewater treatment, removing radioactive elements in wastewater, and weighing metal ions and ammonia nitrogen (NH 3 N) and phosphorus acid radicals and other harmful ions. According to the study, 137 Cs and 90 Sr can be fixed in the zeolite lattice by melting the zeolite (it takes 500 years to lose 1%) to prevent diffusion pollution and even recycle.

(2) Zeolite as a molecular sieve: When heated, the water molecules in the cage and the channel gradually escape without destroying the crystal structure, and can be re-absorbed under appropriate conditions. This form of water is called zeolite water. When the water molecules are removed, the residual charge in the cage and the channel can adsorb foreign liquids, gas molecules (such as NH 3 , CO 2 , H 2 S, SO 2 , etc.), and molecules smaller in diameter than the channel can enter the channel and be adsorbed. If the diameter is larger than the channel, it is rejected, which plays a role in screening the molecules. The molecular sieve property of the zeolite can separate the mixed gas, the liquid, remove the exhaust gas, treat the natural gas, etc., and can also be used for the improvement of the soil, that is, the nutrient material is adsorbed in the zeolite crystal lattice and is not easily lost, but is slowly absorbed by the crop.

In addition, it can also be used in the cement and building materials industries to produce sturdy and lightweight products. Due to the wide application of zeolite ore, natural-produced zeolites are no longer sufficient. Currently, volcanic rocks ( perlite , rhyolite, white montite) and clay rock are used to synthesize zeolite. Minerals such as kaolinite and pyrophyllite can also be used. Zeolite, which has formed a very experienced production line. In addition, the zeolite can be modified by ion exchange to be modified into Ca type, K type, Na type, etc., to suit different industrial applications. The morphology and physical properties of various zeolites are not much different, and they are all fibrous, bundled, columnar, plate-like, and some are granular; mostly colorless or white, dyed into other colors due to impurities, or exchanged by cations. Pigment ions enter and stain. Some zeolites have hair-rotation. Compared with anhydrous framework silicate, it has the characteristics of light density (generally 1.9 to 2.3), low hardness (generally 3.5 to 5.5), low refractive index and easy decomposition. There is usually a complete set of cleaves.

Natural zeolite was first discovered in basalt . It is now known to be mainly produced in sedimentary rock layers that have not been metamorphosed, especially in the sedimentary rocks of volcanic debris. There is also output in the soil. It can also be produced as a secondary silicate mineral. There are about 36 natural zeolites known and more than 100 artificial zeolites. The distribution of these zeolite mineral species is extremely uneven and difficult to identify, and needs to be determined by means of X-ray, optical microscopy, differential thermal, infrared spectroscopy and the like. Representative mineral species are: Mordenite (also known as mordenite) (Na 2 , K 2 , Ca) 2 [AlSi 5 O 12 ] 4 · 12H 2 O, analcite Na 2 [AlSi 2 O 6 ] 2 · 2H 2 O, zeolite (Heulandite) (Ca, Na 2 ) [Al 2 Si 7 O 18 ]·6H 2 O, Phillipsite (K 2 , Na 2 , Ca) [AlSi 3 O 8 ] 2 · 6H 2 O, chabazite (Ca, Na 2 ) [AlSi 2 O 6 ] 2 · 6H 2 O, and the like.

Ridge Cap Roll Forming Machine


Ridge Cap Roll Forming Machine

Colored steel ridge cap forming machine is the machine to produce ridge caps for top part of roof, it is covered on the joint part of the two roofing sheet.

The Ridge cap tile will be used on the ridge of the roof or other place.

It can be used well with the glazed tile produced by roll forming machine.

It can be used well with the trapezoidal tile produced by roll forming machine.

 

Technique parameters 

(1) Processing material: Aluminum/galvanized steel/colored steel coil

(2) Material thickness:0.3- 0.8mm

(3) Product size:5800*1500*1300mm 

(4) Main motor power: 4kw

(5) Pump power:4kw

(6) Shaft diameter: 75mm

 (7) Forming steps: 13 steps

 (8) Roller material: high grade 45# steel, hard Chromium plating

 (9) Main frame: 300H Steel 

 (10) Medium plate thickness: 16mm

 (11) Speed:8-12m/min

 (12)Material of the cutting blade: Cr 12 mould steel with quenched treatment 

(13) Control system: PLC computer control

 (14) Power supply: 380V, 3 Phase, 50Hz (can change as customers request)

 

Components of line

1.Decoiler                   1 unit

2.Roll Forming System       1 unit

3.Cutting Device               1 unit

4.Hydraulic Station            1 unit

5.PLC control system         1 unit


 Working Flow:

Loading coil – decoiling – guide feeding – main roll forming – hydrarlic cutting – finished products

Working Flow



Ridge Cap Roll Forming Machine

Ridge Cap Roll Forming Machine,Metal Ridge Cap,Roll Forming Machine,Metal Ridge Cap Roll Forming Machine

CANGZHOU DIXIN ROLL FORMING MACHINE CO., LTD , https://www.hebeimachine.com