A kind of method that the present invention relates to microwave aluminothermic reduction crome metal, belongs to microwave metallurgical technical field. First chromium oxide powder, aluminium powder, potassium chlorate powder, calcium oxide powder are obtained to mixed material after mixing; The mixed material obtaining is carried out to heating using microwave, being warming …
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The target is to research and development of high-chromium products. In the past five years, the jointly research institution promoted researching and development patent product. …
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FIELD: metallurgy. SUBSTANCE: invention relates to aluminothermal production of chromium-based alloy.
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After melting tapping of 30-40% slag into mold is performed for forming scull, and on the liquid slag left in the hearth fluorspar concentrate is loaded and after its dissolution slag and metal are drained under slag layer in the mold. EFFECT: stable output quality of the chromium-based alloy with iron content of 5 wt%. 2 cl, 1 tbl, 2 ex
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Aluminothermic Chromium and Chromium Alloys, Low in Nitrogen FRED H. PERFECT Chromium metal has been produced aluminother- ... Table I. Chemistry of Various Chromium Metals in Parts Per Million Metallothermic (3) AI C Fe N O P Si S V Aluminothermic, USA 3700 300 4100 450 -- -- 4700 180 -- German pre 1939 3400 100 2600 1400 150 ...
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[0021] Embodiment 1: a kind of method for microwave thermite reduction of metallic chromium, the specific steps are as follows: [0022] (1) Mix 670kg of chromium oxide powder, 190kg of aluminum powder, 50kg of saltpeter powder, and 90kg of calcium oxide powder to obtain a mixture, in which calcium oxide powder accounts for 67% of the mass of the mixture, and …
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Manufacture of Aluminium alloy sheets, strips, and foils including re-melting, casting, hot rolling, cold rolling, coating, slitting, and oxidation processes.
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That is, massive metallic chromium can be obtained. Using the microwave aluminothermic reduction method to smelt metal chromium, the process of slag-gold separation and metal phase aggregation and precipitation can be realized in the process of heating up from 1300°C to 1450°C, which is lower than the traditional smelting temperature.
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The document summarizes the development of a small-scale plasma-assisted aluminothermic process for producing less than 2.5 kg of chromium metal. It describes using a sealed 50 kVA plasma-arc furnace to provide controlled …
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Abstract of the Disclosure: A process is provided for the aluminothermic production of low nitrogen containing chromium and chromium alloys,said chromium alloys comprising about 80% chromium, about 20% nickel and less than 0.005% nitrogen, said alloys being especially desirable for use as master alloys in production of super alloys wherelevels of nitrogen imparted by chromium …
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FIELD: metallurgy. SUBSTANCE: chrome is prepared by aluminothermic reduction by charging and melting of charge consisting of the chrome oxide, aluminium, oxidizer and flux at the first stage, and charge consisting of the chrome oxide and aluminium at concentration 1.1-1.65 of stoichiometry at the second stage. Charge melting is carried out using sodium nitrate as …
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Using the microwave aluminothermic reduction method to smelt metal chromium, the process of slag-gold separation and metal phase aggregation and precipitation can be …
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The method of aluminothermic reduction is industrially important at the present time for the production of many metals and alloys (notably ferro-alloys). Such metals and alloys include the reactive metals chromium, niobium, tantalum, molybdenum and vanadium as well as refractory metals such as tungsten.
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This invention is particularly concerned with the application of the principles of aluminothermic processes to the reduction of oxides of the so called "reactive metals" which comprise …
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A process is provided for the aluminothermic production of low nitrogen containing chromium and chromium alloys, said chromium alloys comprising about 80% chromium, about 20% nickel and less than 0.005% nitrogen, said alloys being especially desirable for use as master alloys in …
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Chromium(III) oxide, Cr 2 O 3, was used by the Chinese in the Qin Dynasty (, 259–210 B.C.E.) to coat weapons, such as bronze crossbow bolts and steel swords found at the Terracotta Army (Fig. 5).The Terracotta Army (also called Terracotta Warriors and Horses) is a collection of terracotta sculptures depicting the armies of Qin Shi Huang, the first Emperor of …
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The present invention relates to a kind of method of microwave aluminothermic reduction crome metal, belong to microwave metallurgical technical field.Chromium oxide powder, aluminium powder, nitre powder, calcium oxide powder are well mixed and obtain mixed material by the present invention, reaction raw materials are entered in microwave reaction stove by its top …
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Chromium Metal. Chromium is a hard silvery metal and used in the production of high temperature alloys and superalloys. The following regular grade of Aluminothermic Chromium Metal is available. Chromium Metal : Cr C Al Si S P; 99% min: 0.03% max: 0.50% max: 0.20% max: 0.02% max: 0.02% max:
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Variants have different features, namely: preset relation of lime (and calcium hydroxide in variants 2,3) to aluminum; limited content of carbon in lime; addition of large part of lime with minimum …
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AT64557B AT64557DA AT64557B AT 64557 B AT64557 B AT 64557B AT 64557D A AT64557D A AT 64557DA AT 64557 B AT64557 B AT 64557B Authority AT Austria Prior art keywords chromium yield carbon increasing free Prior art date Application number Other languages German (de) Original Assignee
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There are two ways of producing chromium metal, by aluminothermic process from chrome oxide and by electrolytic process using ferrochromium or chromic acid. Chromium metal standard grades range from 99% to 99.4%. Higher grades are available at …
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the present invention may be characterized as an aluminothermic process for the production of magnesium metal and a calcium-aluminate slag containing recoverable alumina by the reduction of magnesium oxide with substantially pure aluminum in a reaction zone at an elevated temperature wherein: the oxide charge contains MgO and CaO in a weight ...
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EFFECT: increasing the output of high-quality grades of chrome, increasing the extraction property of chrome to metal. 1 tbl, 2 ex
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As stated in Chapter 1, there are no aluminothermic chromium-metal production plants currently extant in the United States, but existing aluminothermic production plants that produce other high-purity metals could produce chromium metal if required. Also, since the aluminothermic process is not as capital-equipment intensive as the electrolytic ...
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At that, loading and burning of charge is performed in one stage with speed of 330-450 kg/m2 min, and after some portion of slag is drained to the casting form on slag lining, fluorspar concentrate is loaded on the rest of liquid slag, and after the latter is dissolved, slag and metal is drained. ^ EFFECT: increasing the output of high-quality ...
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US4331475A US06/172,545 US17254580A US4331475A US 4331475 A US4331475 A US 4331475A US 17254580 A US17254580 A US 17254580A US 4331475 A US4331475 A US 4331475A Authority US United States Prior art keywords chromium nitrogen nickel alloy alloys Prior art date Legal status (The legal status is an assumption …
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US4331475A US06/172,545 US17254580A US4331475A US 4331475 A US4331475 A US 4331475A US 17254580 A US17254580 A US 17254580A US 4331475 A US4331475 A US 4331475A Authority US United States Prior art keywords chromium nitrogen nickel alloy alloys Prior art date Legal status (The legal status is an assumption and is not a legal …
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Four aluminothermic chromium-metal producers and one electrolytic chromium-metal producer have closed down in Western Europe, North America, and Japan over the past six years. The dismantling of the Tosoh facility in Japan as part of an urban renewal program has left Elkem in the United States as the only significant electrolytic producer ...
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CA1175661A CA000375333A CA375333A CA1175661A CA 1175661 A CA1175661 A CA 1175661A CA 000375333 A CA000375333 A CA 000375333A CA 375333 A CA375333 A CA 375333A CA 1175661 A CA1175661 A CA 1175661A Authority CA Canada Prior art keywords chromium nitrogen nickel alloy alloys Prior art date Legal status (The legal status is …
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A method and system for recovering low carbon ferrochrome from feed materials including chromite ore and aluminum granules in a chamber of an arc furnace using an aluminothermic …
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