SU704929A1 - Refractory mass - Google Patents

Description

(54) REFRACTORY MASS A 13. 7 At the same time, in order to increase the mechanical strength, it additionally has YODOrzkite chromate MaTSh in an amount of 2-5 wt.%. When the content of chromic acid is less than 10 wt.%, The time of scrapping is more than 2 hours, and the product has insufficient mechanical strength (, 300 K1x: / cm). The content of chromic acid in the charge results in a 15% wt. Increase in the porosity of the products and, as a result, their rapid increase. Additional introduction of magnesium chromate less than 2 wt.% Not dMt of a substantial increase in mechanical strength, and magnesium chromate content exceeding 5 wt.% Leads to an increase in the creep of the refractory at high temperatures, Example. To obtain a lining, a mixture consisting of 85 wt.% OXM OXIDE OXM-1 and 15 wt.% 9 chromic anhydride of Tochppis, aa-i, is added with water to a moisture content of 12-14% and molded in a collapsible form using vibration compaction. After the mass is set, the product is dried and calcined to 9501000 ° C directly during operation. PRI mme R 2. Schichtu consisting of 85 wt.% Chromium oxide OXM-1, 3 weight; The% magnesium chromate and 12% by weight of technical chromic anhydride are moistened with water to a humidity of 16-18%. The prepared mass is molded and fired in the manner indicated in Example 1. EXAMPLE 3 A mixture consisting of 90% by weight of chromium pigment oxide and 10% by weight of technical chromic anhydride is moistened with water to a moisture content of 15%. Molding, drying and roasting were carried out in the manner indicated in Example 1. Table 1 shows the properties of the lining.

350-370 520-55025-ЗО

290-ZZO 610-67022-28

240-290 410-4 5О25-ЗО

The formula and 3 are: 1. Refractory mass of RyoyKtyrov lining to obtain chlorine chromium, including chromium oxide and chromic acid, so that it is necessary to increase the purity and yield of It contains a component and the following ratio, weight 9 &:

Chromic acid

(in terms of CXC) 1O-15 Chromium oxideOstal

96-98 O, O5 0.05 96-98 O, O5 0, O5 96-98 O, O5 O, 05

2. The mass according to claim 1, that is, so that, in order to increase the mechanical strength, it additionally contains magnesium chromate in an amount of 2-5 wt.%

. Sources of Information

taking into account in the examination

1. USSR author's certificate No. 41.4232, C 04 B 35/12, 1972. 2. US Patent No. 3582374, cl. 06-66, 1971.