SU1557139A1 - Charge for manufacturing forsterite refractory - Google Patents

Abstract

The invention relates to the refractory industry, namely to the charge for the manufacture of forsterite refractories used for lining open-hearth furnaces. The purpose of the invention is to increase the slam resistance, strength and decrease the temperature of the synthesis of forsterite. The mixture for the manufacture of forsterite refractories contains, in wt.%: Magnesium concentrate obtained during the purification of highly mineralized thermal waters, 40-82, quartzite 16-50, zirconium oxide 1.5-8, anhydrous sodium silicate 0.5-2. The temperature of the synthesis of forsterite 950-1000 ° C

compressive strength after drying at 200 ° C 27.8-35.6 MPa, after firing at 1500 ° C 63.2-72.4 MPa

apparent density of 3.07-3.2 g / cm ³

open porosity 13-14,6%

temperature of the onset of deformation under a load of 2 kg / cm ² 1760-1780 ° C. 2 tab.

Description

The invention relates to the refractory industry and can be used in the production of forsterite products, for example, for lining open-hearth furnaces.

The purpose of the invention is to increase the slag-resistance, strength and decrease the temperature of the synthesis of forsterite.

Magnesium concentrate obtained by purifying highly mineralized thermal waters is characterized by the content of oxides, wt.%: MgO 80-88; CaO 10-18; Reg03 - A1.0 0.2-2.2; SiOt 1.6-3.5.

As quartzite, ground quartzite can be used at the Pervouralsk dredge factory or ground quartzite at the Krasnogorsk refractory plant with a 5 Ug content not less than 97% without the content of shale impurities.

Zirconium oxide corresponds to CMTU 05-190-69 and contains 96-98.4% ZrOa, being a white powder.

Anhydrous sodium silicate (silicate block) is characterized in accordance with GOST 13079-81 by the silicate module 2.7-3.5.

Example. The mixture of dry ingredients is 10 kg. Odozirovanny 100 g of sodium silicate and part of the refractory components of 5% by weight of the total mixture (500 g of magnesium concentrate and 500 g of quartzite} grind in a laboratory dry-ground ball mill to grind cement with Svfl 2.5-3.0 thousand cm2 / d. The rest of the refractory components of magnesium concentrate (5500 g) and quartzite (2700 g), together with zirconium oxide, are mixed in a mixer, i

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effect for 5 min followed by moistening up to 8%, then samples — cubes with a rib size of 7.07 cm are thrombusted manually in layers. After molding, the samples harden in a drying chamber at 200 ° C, the samples are fired from 900 to 1500 ° C with an interval of} 0 ° C.

The composition of the mixture are given in table.1,

Table 2 shows the properties of refractories obtained from the above compositions,

The test results showed that the samples from the mixture of the proposed composition have a higher slag resistance. Increasing the slag resistance of refractories provides an increase in the service life of the lining. The increase in slag resistance (the refractoriness of the product is determined from 30% of blast furnace slag) by 20-30 ° C provides an increase in the lining time, for example, in open-hearth furnaces by 1.5 times.

The synthesis of the forsterite mineral occurs at lower temperatures than in the prototype, the synthesis temperature decreases by 100 ° C, i.e. at almost 950-1QO ° C, the refractory material from the proposed mixture acquires the final structure. In passing

other positive results are achieved, for example, a general increase in the deformation temperature under a load of 20-30 ° C, the question of the disposal of waste obtained from the purification of highly mineralized thermal waters is solved, there is no process of briquetting and preliminary calcination up to 1620-1650 ° C.

Claims (1)

Invention Formula The mixture for the production of forsterite refractories, comprising a magnesia-silicate material and an additive, characterized in that, in order to increase slag resistance, strength and decrease the temperature of the synthesis of forsterite, it contains as a magnesia-silicate material- magnesium concentrate, obtained during the purification of highly mineralized thermal waters, and quartzite and, as an additive, zirconium oxide and, additionally, anhydrous sodium silicate in the following ratio of components, wt.%: The indicated magnesium concentrate Quartzite Zirconium oxide Anhydrous sodium silicate 40-82 16-50 1.5-8.0 0.5-2.0 Magnesium-silicate component Magnesium concentrate Quartzite Zirconium oxide Anhydrous sodium silicate Magnesite powder Itri oxide Table 1 87.0 82 16 1.5 0.5 Compiled by L. Bulgakova Editor N. Kishtulinets Tehred M. Khodanich. Proofreader m. Samborska Order 697 Circulation 570 VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and publishing plant Patent, Uzhgorod, st. Gagarin, 101 Table 2 Subscription