Calcination temperature influence on the quality of ceramic proppant of

  Firing a ceramic proppant production in the last process, have a great impact on its microstructure and macroscopic proppant suppliers . After determining the ratio of the sample will produce a fine powder in the firing process at a lower temperature between the liquid phase, while also British to the reaction and petrochemical corundum phase transformation occurs, it is necessary to control the firing temperature, so that maintained in an optimum temperature range, thus ensuring after firing has an excellent overall performance. If the temperature is too high there will be over-burning phenomenon, and ferric oxide (Fe203) of content. After generating the liquid surface, hindering oxygen diffusion to the center, then it will happen Fe203 = 2Fe0 + I / 20z reaction. Due to the volume effect of the strength and density of the reaction products are reduced. If the calcination temperature is too low there will be less burning phenomenon, due to insufficient sintering, its intensity is reduced. In the production process of the actual situation shown in Figure 4.5.
The figure shows that the firing temperature has little effect on the bulk density, but have a greater impact on the fragmentation rate and acid solubility. Minimum breakage rate corresponding firing temperature was 1360 ℃, while the corresponding acid solubility best when firing temperature is 1350 ℃. Therefore, in order to obtain the desired combination of properties, the firing temperature must be controlled at between 1350-1370 ℃; to producing a high strength low density proppant , the firing temperature should be controlled at about 1360 ℃, the solubility of the acid <5%, can meet Claim.

Lytag Introduction

Pulverized coal ash is a low extinguished after constituted like pozzolana mixed. It was extinguished coal plants will be ground into pulverized coal 100 microns or less, with a warm-up atmosphere injected into the furnace to form a suspension off, low-temperature occurrence thick cloud of smoke small amounts of non-combustible material, install the trap to get through the dust fly ash. The chemical composition of fly ash is similar to clay, minor identity as silica, aluminum oxide, ferric oxide, calcium oxide and unburned carbon. Fly ash is a coal-fired power plants are the major solid waste discharge.
Lytag is fly ash as the main raw material (85%) about the incorporation of the right amount of lime (or carbide slag), gypsum, additives, etc., by measurement, ingredients, forming, hydration and hydrothermal synthesis reaction or An artificial lightweight aggregate reaction and made of natural water hard. Ceramic has excellent properties such as low density, high pressure tube, high porosity, softening coefficient, good frost resistance, excellent alkali aggregate reaction and so on. Especially due to the small high density ceramic density porous internal morphology, composition more uniform, and possessed a certain strength and robustness, which has a lightweight, corrosion-resistant, frost, seismic and good barrier properties (insulation, heat insulation, sound insulation, separated tide) and other multi-features. The use of these excellent properties of ceramic, it can be widely used in building materials, gardening, food and beverage, fire-resistant insulation materials, chemical, oil and other departments, applications increasingly widespread, continues to expand. At the beginning of the invention and production of ceramic proppants , it is mainly used for building materials, as technology continues to evolve and people on a deeper understanding of the performance of ceramic, ceramic applications already exceeded the scope of the traditional building materials, expanding its use of new fields. Ceramic building materials now in use, and has fallen from 100% to 80%, applied in other areas, accounted for 20%. With the continuous development of new uses for ceramic, its share in other areas will gradually increase.

By ceramic shape classification

Ceramic according to shape into gravel-type ceramic, spherical and cylindrical ceramic ceramic.
(1) gravel-shaped ceramic
Gravel-type ceramic proppant general use natural mineral production, the first stone grinding, roasting, and then sifting; also available in natural and artificial light materials such as pumice, scoria, cinder, coal and other natural or calcined directly broken screen points derived.
(2) spherical ceramic
Spherical ceramic production is the use of the disc pelletizer. First raw flour, then add water pelletized into balls and then baking or curing together. At present, China's resin coated ceramic proppant Most of this variety.
(3) a cylindrical ceramic
Cylindrical ceramic commonly used plastic extrusion. First made of mud, and then cut into a cylindrical shape. This ceramic ball is suitable for high plasticity clay like material, the yield is relatively low. If using a cylindrical blank brick back firing in the kiln cylinder roll into an oval shape.

Ceramic sand trommel

Trommel main motor, reducer, roller units, racks, closures, expected out components. Roller means mounted on the frame inclined. After the drum motor reducer are connected together by coupling means, the drive roller means rotatable about its axis. When the material into the drum unit, due to the tilt and rotation of the drum unit, flip and scroll the screen so that the material surface, so that hsp proppant qualified materials (undersize product) by the cylindrical drum sieve discharge, substandard materials (on screen product ) by the end of the discharge roller. As the material within the drum flip, scroll, so that the material in the meshes of the card can be ejected, to prevent petroleum proppant clogging of the sieve. Drum sieve sand, the principle of construction drum trommel screening machine with almost the same, there are differences on the people know it and it is called.