Complex modifying additive for production of construction ceramic products from high-plastic clays. RU patent 2518993.

FIELD: construction.

SUBSTANCE: complex modifying additive for production of construction ceramic products from high-plastic clays contains a mix of a mineral organosilicic powder and a water retaining cellulose-containing additive at the ratio of the organosilicic powder to the water-retaining additive 1:(0.05±0.01), accordingly.

EFFECT: reduced costs for fuel and energy resources.

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The invention relates to the production of building ceramics and can be used in the manufacture of a brick, ceramic stones, tiles by a method of plastic forming of highly clays with high career humidity.

It is known that the humidity of the charge used for the production of building ceramics plastic molding method should not exceed 18-20%. Since the main component of the charge - clay may have humidity in the range of 22-30%of the required techniques and/or substances that bind excess moisture. For these purposes traditionally use drying clay or lime as water-retaining additives. While drying clay requires coolant flow, in addition, operation of the drying cylinder is labor-intensive and energy-intensive redistribution of production of ceramic products. Application of lime leads to belousovova plaque in the finished product, which is unacceptable for the front of building products. In addition, in the process of burning of ceramic products possible carbonization of calcium, which leads to "dutikov" and loss of strength of finished products. Thus, reduce the moisture content of the clay raw materials reach the drying drums with the use of fuel and energy resources, either through the use of lime with its inherent shortcomings are evident in the finished product.

The present invention is saving fuel and energy resources by eliminating redistribution drying of raw materials before forming ceramic products, as well as the exclusion of the shortcomings of products from clay with a career high humidity due to the use of lime. To solve the set tasks developed a comprehensive modifying additive containing a mixture of mineral silicon powder and water retention cellulose-containing additives with a ratio of mineral powder to the water-holding Supplement 1:0,05±0.01 respectively.

Improvement of properties of clay raw materials through the introduction of modifying additives at the stage of its preparation, mixing with other components of the charge is a new direction in the production of building ceramics. Related to polyethyleneglycoladipinate additives of series "LITOPLAST M", known as thinners raw sludge in the production of Portland cement clinker for cement, began to apply at plastic moulding bricks (Svirkova, Ovewrcome, Everlovin "Construction materials, may 2012, p.32-33, 90-92) [1]. However, as follows from [1], additives "LITOPLAST M" is used as thinners clay raw materials, and information that the introduction of clay furnace additives LITOPLAST 5M in the amount of 0.3% leads to decrease molding humidity mass on 4% while maintaining plasticity (14)not confirmed by the industrial tests at Hrabovska brick factory. Humidity obtained from this mass of timber amounted to 18-19%, which implies that the test clay had low, in the range of 21%, career humidity. It is also established that depending on the plasticity of used clay additives series LITOPLAST M enter in the quantity of 0,1-0,5% of the mass batch. This is due to the terms of ease of introduction of the additive in the clay raw materials, since in the conditions of large-tonnage production of ceramic products, the introduction of small quantities of additives in calculation, for example, per ton of clay-containing mixture, is a technological issue, not having decided that, to achieve a high quality additive interaction with clay difficult.

The claimed invention is a comprehensive Supplement in the form of a mixture where the main component that holds the clay excessive moisture, is a cellulose additive. Mineral silicon powder with a particle size of not more than 500 microns is its diluent. It's his main function, at the same time used in the addition of mineral silicon powder chemically very similar to the clay, therefore, it is, without compromising the original rheological properties of highly plastic clay is useful for such a clay ataxites. The mixture of mineral kremniyorganika powder and water retention cellulose additive in the ratio of 1:(0,05±0,01), respectively, decreases the relative molding humidity clay raw materials at the expense of the proceeding in the preparation of the clay of physical-chemical processes. Declared the complex allows to sniziti career humidity clay raw materials from 5 to 7%. The ratio of mineral silicon powder to water retention Supplement 1:(0,05±0,01) was determined experimentally and following reason. When injected into the clay with high humidity modifying additives that have a ratio of silicon powder to water retention addition of less than 1:0,04, excessive water contact will not. In this situation it is necessary to increase the quantity of the entered additive that is economically inexpedient. With the introduction of clay modifying additives that have a ratio of plasticizer to water retention addition of more than 1:0,06, there is a possibility of drying of clay that will lead to increase of water consumption in forming and increased wear of molding equipment. In addition, declared additive can be introduced in quantity from 0,1 to 0,4% by weight of the mixture, facilitating the formation of the manufactured products, contributing to the more dense packing of particles in moulding mass, increase the mechanical strength of semifinished and finished products, and reduction of open porosity and water absorption, despite the fact that the declared Supplement meets technology of its introduction. New technical result achieved when using the claimed invention consists in that in the process of preparation of the clay raw materials comprehensively achieved by reducing its excessive career humidity and high ductility, provided the technology of introduction of modifying additives.

For preparation of complex modifying additives as mineral silicon powder used fume - by Elkem Microsilica (Norway), containing more than 85% SiO 2 , as well as ash from coal burning Reftinskaya GRES (pravdinskiy Sverdlovsk oblast). The chemical composition of ash, wt%: SiO 2 - 50% to 65, Al 2 O 3 - a 25% to 30, Fe 2 O 3 Is 3-6, CaO+MgO - 2 to 4, R 2 O - 1 to 3, the SPT≤5. Suitable also tridelity powder, representing an amorphous silica fume is a placeholder siliceous it is brand cite beyond 5712-046-00187085-2006, mass fraction SiO2 in which not less than 92%, production of JSC "Dinur", bervoerts Sverdlovsk oblast As water-retaining additives used:

- the hypromellose brand RUTOCEL 55RT (receiver array), LLC "Bang and Bonsomer" (www.bangbonsomer.com), and polyacrylamide brand Agocel S-2000 to The International Community for Dryimix Mortar (www.dryimix.info/industry-directory/polyacrylamide).

For sample preparation of clay with a number of plasticity GOST 9169-75 - more than 15 were used:

- clay used CJSC "Pskov brick", Pskov, Russia the number of plasticity - 16-17, career humidity - 24-65%;

- clay used LLC "WSSM", Pospisil, the number of plasticity - 16-18, career humidity - 26-28%.

Modifying additive prepared in the laboratory. 100 g of dry silicon powder added 5 g dry water-retaining additives with a constant mechanical stirring within 5-10 minutes. Samples for tests was formed in the size 50 x 50 x 50 of clay original composition without modifying additives and with the addition of 0.3% prepared additives. After drying the samples were annealed at temperatures of 1000 C and experienced the strength in compression, water absorption, porosity. As shown in table results of comparative tests of clay samples with modifying additive and without it, it is revealed that the input of complex modifying additives containing mineral silicon powder and water retention cellulose additive, reduces water absorption samples, porosity of 1% to 3%, increases mechanical strength from 10% to 40%. The introduction of modifying additives allows to produce plastic forming of highly clays with high career humidity goods corresponding to GOST 530-2007. Similar data were obtained in the testing of samples with a ratio of mineral silicon powder and water retention cellulose additive 1:0.04 and 1:0,06 respectively.

Thus, the use of complex modifying additives in the production technology of construction ceramics eliminates the redistribution of drying of raw materials before forming, saving fuel and energy resources, and to eliminate the defects of products from clay with a career high humidity due to the use of lime.