A test method for slag resistance of refractory materials

Abstract

The invention belongs to the field of refractory materials and provides a refractory material slag resistance test method. The method comprises preparing a test crucible containing a plurality of sample materials to be measured, measuring and recording thickness L0 of the side wall of the test crucible, adding cast iron blocks and iron sand into the test crucible, wherein laying thickness of the cast iron blocks and iron sand is 2 / 3 depth of the test crucible, laying test sample slag on the cast iron blocks and iron sand, drying the test crucible with the cast iron and test sample slag through an oven, selecting and setting an appropriate test atmosphere according to tested sample characteristics and a service environment, carrying out heating and thermal insulation slag resistance tests, carrying out cooling and blowing out, treating and analyzing the slag resistance sample, measuring and recording thickness L1 of surfacing slag line positions of the slag resistance sample materials and calculating a slag corrosion amount delta L according to a formula of delta L=L0-L1. The method realizes simulation of damage of refractory materials in thermotechnical devices and provides a technical support for thermotechnical device refractory material contrast selection and novel material research and development.

Description

technical field [0001] The invention belongs to the field of refractory materials, and mainly relates to a method for testing the slag resistance of refractory materials. Background technique [0002] Refractories are key materials in the high-temperature field; most refractories are in direct contact with the melt at high temperatures, and the degree of damage to refractories by slag will directly affect the performance of refractories. In actual use, the interaction between slag and refractory materials is very complicated, mainly manifested as chemical erosion, penetration and erosion of refractory materials by slag. The composition, viscosity, and relative movement speed of the slag, as well as the temperature, pressure, and atmosphere of the environment all affect the slag resistance of the refractory. [0003] In actual production and industrial applications, as well as in the scientific research of refractory materials, the slag resistance of refractory materials is ...

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Problems solved by technology

However, this method also has some disadvantages, such as: 1) Open environment, using flame heating, large fluctuations in test temperature, and extremely low reproducibility of test conditions; 2) The test is an open environment, and the choice of test atmosphere is limited; 3 ) The test cycle is long, generally 24h, up to 72h for a long time, a test consumes a lot of manpower, material resources and financial resources

[0005] In China's current national standard GB / T 8931-2007, the slag resistance test method of refractory materials proposes a rotary slag erosion method similar to the American ASTM standard, and also proposes a slag resistance test method commonly used in refractory research— —Static crucible method, which is to make a refractory material sample into a crucible shape, put the test slag in the crucible and place it in the furnace, let the slag react with the crucible at high temperature, and use the slag to corrode the crucible sample section and The slag resistance of refractory materials is evaluated by the amount of infiltration; the advantage of this method is that it is easy to operate, and the sample can be placed in the furnace with different atmospheres and temperatures for testing according to requirements, and the reproducibility of the test is high; however, this method There are also some shortcomings, such as: 1) The slag and refractory materials are relatively static in the test, which cannot simulate and reflect the erosion of the slag on the refractory materials in the real environment; 2) The test is to place the entire crucible in the furnace, and the direction of heat conduction From the outside to the inside, the outer wall of the crucible is first heated, then conducted to the inner wall of the crucible, and then to the test slag. In the test, there is almost no temperature gradient between the entire refractory material and the molten slag, which is consistent with the temperature field of most refractory materials in the actual use environment. The distribution is seriously inconsistent, so the test results are not very instructive for actual production applications

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