Product from chromium oxide

FIELD: chemistry.

SUBSTANCE: sintered refractory product consists of an aggregate bound by a matrix, and contains oxides in percentage by weight: more than 65 of Cr2O3, less than 35 of Al2O3, 1 or more of ZrO2, at least 20 wt % of which is stabilized in the cubic and/or tetragonal form, 0.1 or more of Y2O3, acting as a stabiliser of zirconium oxide ZrO2, less than 1.9% of HfO2, wherein the total content of chromium oxide, aluminium oxide, and zirconium oxide Cr2O3+Al2O3+ZrO2 is more than 90 wt %. The product contains a coactivator that is active or inactive as a zirconium stabiliser selected from CaO, MgO,TiO2, and mixtures thereof, wherein the total content of calcium oxide, magnesium oxide, and titanium oxide CaO+MgO+TiO2 is less than 6.0 wt % and more than 0.5 wt %, and more than 50 wt % of yttrium oxide and co-activator are present in the matrix.

EFFECT: improving the stability of refractory materials for slag corrosion and temperature changes.

24 cl, 16 ex, 2 tbl

 



 

Same patents:

FIELD: chemistry.

SUBSTANCE: refractory inner lining of a gasifier is made from sintered material which contains at least 45 wt % chromium oxide (Cr2O3), at least 1 wt % zirconium oxide, wherein at least 30 wt % of said zirconium oxide (ZrO2) is stabilised in cubic and/or tetragonal form, as well as silicon oxide in amount of 3 wt % and aluminium oxide. Total content of oxides of chromium, zirconium, aluminium, silicon and calcium is over 95 wt %. Preferably, the material contains over 80 wt % chromium oxide, over 1 and less than 10 wt % aluminium oxide and over 6 and less than 7 wt % zirconium oxide, as well as at least one additive which stabilises or does not stabilise zirconium oxide, selected from a group comprising: CaO, MgO, Y2O3, TiO2.

EFFECT: higher corrosion resistance of the gasifer lining.

31 cl, 3 tbl

FIELD: construction.

SUBSTANCE: method of manufacturing of products presupposes preliminary fabrication of briquettes of charge material on dry bases containing 96 wt% of chrome oxide and 4 wt % of titanium oxide. In the course of manufacturing of briquettes orthophosphoric acid is loaded into the charge material as a binding agent. Briquettes are burnt at temperature range of 600-1000°C; cut fractions of filler are produced and loaded into the preliminary fabricated fine mixture of chrome oxide, titanium oxide humidified with orthophosphoric acid up to 4-12 wt %, over 100% of the total quantity of powdery components. Molding sand is received by blending and homogenising with the fraction content, wt %: fraction 0.5-2 mm; fraction <0.5mm - 20; fine mixture <0.005mm - 30; half - finished product is molded, dried and burnt in temperature range of 1500±50°C.

EFFECT: improved quality of refractory bricks.

2 tbl, 3 ex

FIELD: methods of production of refractory ceramic materials.

SUBSTANCE: the invention is pertaining to ceramic materials technology and may be used for manufacture of chrome-oxide ammunition at production of the glass fiber. The technical result of the invention: production of a structure with an adjustable density distribution along a refractory product cross-section. A formed effective surface of the refractory products made out of chrome oxide subject to action of a reduction medium by its direct contact in the raw with a carbon component. A sintering is conducted in the gas-flame furnaces with an air-fuel ratio of 1.05 - 1.3. At the final temperatures of the sintering carry out isothermal soakings within the limits of obtaining the preset ratio of the layers of the dense and porous structure. The carbonic component is used in the form of granular masses (Kryptol crumbs) or dense bodies of various methods of manufacture.

EFFECT: the invention ensures production of a structure with an adjustable density distribution along a refractory product cross-section.

2 cl, 1 ex

The invention relates to refractory industry and can be used for the manufacture of chromiumcontaining refractories used for the coating of glass furnaces

The invention relates to refractory industry and can be used for the manufacture of chromocene refractories used for the coating of glass furnaces

The invention relates to the production of refractory mixture which can be used as masonry mortar for coating in the production of lining and repairs thermal units

The invention relates to the production of lime-containing refractories (containing free calcium oxide) and can be used in the manufacture of refractory masses, products and linings
The invention relates to the production of ceramic materials

The invention relates to the technology of production of chemically resistant ceramic materials and products for the chemical, oil and gas, pulp and paper, metallurgical and other industries, namely for the production of tiles, chemical equipment, pipes and supplementary materials for use in corrosive environments

FIELD: construction.

SUBSTANCE: charge for production of an alloyed spinel material contains alumina, periclase, magnesium-alumina spinel, chrome oxide and zirconium dioxide, at the following ratio of components, wt %: alumina - 52.8-64.3; periclase - 22.7-25.2; magnesium-alumina spinel - 8.0-10.0; chrome oxide - 2.0-6.0; zirconium dioxide - 3.0-6.0. The alloyed spinel material contains a phase of alloyed spinel with the following composition Mg0.91-1.08(Al0.91-1.01Cr0.019-0.061)2O4 and phase of zirconium dioxide ZrO2, at the following ratio of phases, wt %: Mg0.91-1.08(Al0.91-1.01Cr0.019-0.061)2O4 - 94.0-97.0; ZrO2 - 3.0-6.0.

EFFECT: increased density and strength and reduced porosity of items.

2 cl, 5 ex, 1 tbl

FIELD: chemistry.

SUBSTANCE: invention pertains to production of fireproof products, mainly for glass-melting furnaces. The charge mixture consists of the following components in the given percentage mass ratios: ZrSiO4 8.5-10.5; Al2O3 72.0-75.0; TiO2 5.0-6.5; Cr2O3 5.5-7.0; ZnO 3.5-5.0; H3BO3 0.5-1.0. The products reach breaking point under pressure of 123-128 MPa, and have effective porosity of 0.15-0.2%.

EFFECT: increased durability and lower effective porosity of the products.

1 tbl

Refractory mass // 2212387
The invention relates to the production of refractory materials and can be used for the repair and manufacture of steel ladle refractory lining of furnaces, aggregates, petroleum refining and oil and gas industry, reactors, technical carbon, melting arc furnaces and installations HDTV

FIELD: construction.

SUBSTANCE: in a cold method for obtaining asphalt concrete of increased strength for repair and construction of road pavements using mineral material in the form of crushed stone, sand by their being mixed with cement and bituminous emulsion, with further application of the obtained asphalt-concrete mix onto the road base and its compaction, mixing is performed at addition to the above said cold mineral material for 100 of its wt % subsequently in 40-90 seconds of the next components, wt %: cement - 3.0-6.0, nanocomposite additive with particle size of 50-300 nm, mainly 80-160 nm, which contains the following, parts by weight: active silicic acid 0.01-3 and latex based on styrene, ester of acrylic acid, butadiene, acrylonitrile, acrylic or methacrylic acid, their mixtures 1 (in terms of a dry substance) 0.075-0.25, cationic bituminous emulsion (in terms of bitumen) 2.0-5.0.

EFFECT: saving of energy resources and improving strength of asphalt concrete.

4 tbl, 5 ex, 4 dwg

FIELD: construction.

SUBSTANCE: raw mixture for manufacture of concrete contains the following components, wt %: cement 20.0-40.0; filler 20.0-64.0; composite reinforcement bars cut into 5-30 mm pieces 1.0-20.0; water 15.0-20.0.

EFFECT: increasing strength of concrete.

1 tbl

FIELD: construction.

SUBSTANCE: non-fired heat-insulating material made from the mix comprising a binder, PB-2000 frother and water where the binder of the mix is the suspension obtained by mixing of the bergmeal ground to the specific surface 2000 m2/g, 40% solution of caustic soda and water in a weight ratio 1:1.34:3.10, holding at 95°C within 4 h and cooling, and in addition - sodium silicofluoride and microsilica at the following ratio of components, wt %: the named suspension 68.0-74.0, sodium silicofluoride 5.2-6.0, PB-2000 frother 0.38-0.42, microsilica 3.6-4.8, water - the rest.

EFFECT: producing of wall materials using the simplified technology and local raw materials.

3 tbl

FIELD: construction.

SUBSTANCE: raw mix for manufacturing of foam silicate contains, wt %: ceramic dust from cyclones with particle size up to 150 mcm - 45-50, aluminium powder - 1.5-2.5, sodium water glass - 37-40, 33% solution of sodium oxide hydrate - 6-7, filtration residue of sugar production - sugar lime - 3.5-4.5, stabiliser of cellular structure in the form of sunflower husks with particle size of up to 1 mm - 0.5-1.0.

EFFECT: stabilisation of a cellular structure of foam silicate, increased strength under compression of finished product and its reduced cost.

6 tbl, 2 dwg

Mastic compound // 2556542

FIELD: construction.

SUBSTANCE: mastic compound contains the following, wt %: Portland cement 40.0-45.0; quartz sand 53.3-58.25; old car tyres that are crushed and sieved through mesh No. 2.5 0.1-0.15; asbestos 0.1-0.15; sodium ethyl siliconate or sodium methyl siliconate 1.5-2.5 at water-to-cement ratio of 0.45-0.55.

EFFECT: improvement of cold resistance of a mastic compound.

1 tbl

FIELD: construction.

SUBSTANCE: high-strength concrete from the mix comprising Portland cement, silicon dioxide containing component, an additive and water contains quartz sand with the fineness modulus, Mc. = 2.6, the crushed stone is the granite crushed stone with the fraction 5-10 mm, the silicon dioxide containing component is the colloidal solution H2SiO3 with the density ρ = 1.014 g/cm3 and pH = 4±0.5 value, and the additive is the water solution with the density ρ = 1.12 g/cm3 and pH = 7.5±0.5 consisting of the mix of polycarboxylated polymers: polycarboxylated polymer on the basis of methacrylic acid with the density ρ = 0.95 g/cm3 and pH = 7±0.5, polycarboxylated polymer on the basis of allyl ether and maleic acid anhydrite with the density ρ = 1.03 g/cm3 and pH = 7±0.5, sodium gluconate C6H11NaO7 and water at the following ratio of components, wt %: polycarboxylated polymer on the basis of methacrylic acid with the density ρ = 0.95 g/cm3 and pH = 7±0.5; - 9.3-10.0; polycarboxylated polymer on the basis of allyl ether and maleic acid anhydrite with the density = 1.03 g/cm3 and pH = 7±0.5 - 10.2-10.4; sodium gluconate C6H11NaO7 - 2.6-2.8; water - 77.2-77.5, at the following ratio of components of high-strength concrete, wt %: Portland cement 21.1-23.2; the named crushed stone 41.94-42.82; the named sand 28.3-29.0; the named silicon dioxide containing component 0.12-0.13; the named additive 0.15-0.2; water 6.24-6.75.

EFFECT: increase of mobility and survivability of concrete mix.

2 tbl

Concrete mixture // 2555966

FIELD: chemistry.

SUBSTANCE: invention relates to industry of construction materials, in particular to production of concrete tiles for floors. Concrete mixture includes, wt.p.: Portland cement 1, marble crumps of fraction 2-8 mm 2-2.2, milled glass of fraction 0.1-0.3 mm 2-2.2, with water-cement ratio 0.45-0.5.

EFFECT: increase of strength.

1 tbl

FIELD: construction.

SUBSTANCE: peat and polymer mix, comprising a base in the form of peat and and a binding element, comprises five components, wt %: nanomodified peat of suspensions of polyvinyl acetate and cyclone dust of gas treatment of air of industrial enterprises (in terms of dry polyvinyl acetate in amount of 5% from mass of peat and dust - 3%) - 25, portland cement CEM-II-42.5 - 35, sodium bicarbonate - 15, ammophos - 5 and water - 20.

EFFECT: increased strength at invariable density, increased fire resistance, reduced heat conductivity.

1 tbl

Up!