Method for preparing artificial stone from iron-containing slag obtained in pyrometallurgucal process

Abstract

The invention provides a method for preparing artificial stone from iron-containing slag obtained in a pyrometallurgucal process, belonging to the technical field of energy-saving, environment-friendly and efficient utilization of iron-containing slag obtained through the pyrometallurgucal process. According to the method, a modifier with a mass percentage content of 0.1-10% is added into the iron-containing slag obtained through the pyrometallurgucal process, extra heating is not needed, and the modifier containing alkali metal oxide is directly melted through the waste heat of the slag, or aslag atmosphere is controlled in a gas blowing assisting mode at the same time; the modified slag is subjected to heat preservation for 10-60 min at a temperature higher than 1150 DEG C, then formingis conducted, and heat treatment is conducted so as to obtain the artificial stone; and a main crystal phase in the artificial stone is magnetite, and the mass percentages of the components of the artificial stone are that the mass percentage of Na2O+K2O is more than 0.5% and less than 8%, and the mass percentage of Fe2O3 is more than 25% and less than 65%. The artificial stone is a black artificial granite stone, a common wear-resistant and corrosion-resistant cast stone product or a functional ceramic material containing magnetite.

Description

technical field [0001] The invention relates to a method for preparing artificial stone from iron-containing slag obtained by pyrometallurgy, and belongs to the technical field of energy-saving, environment-friendly and high-efficiency utilization of iron-containing slag obtained by pyrometallurgy. Background technique [0002] During the non-ferrous smelting process, a large amount of iron-containing slag obtained by pyrometallurgy will be produced, such as copper slag, zinc slag, nickel slag, lead slag, etc. The traditional utilization method is to pour iron-containing slag into the slag pit, let it cool gradually, and then landfill or crush it, and use it as the basic material for road construction such as cement concrete. However, due to the high iron content in these iron-containing slags, it is difficult to use them in the cement concrete industry on a large scale. A large amount of land is occupied every year to pile up these waste slags, which not only wastes resourc...

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Problems solved by technology

[0015] The technical problem to be solved by the present invention is how to overcome the existing technical defect of using iron-containing slag to prepare glass-ceramics, first extracting iron and then preparing glass-ceramic from secondary slag. Different from the prior art, the present invention It is to directly prepare iron-containing slag into glass ceramics, which does not require the energy-intensive process of iron extraction and related complex reaction equipment. Its operation is simple and easy, and the prepared magnetite-based glass ceramics Artificial stone-like glass-ceramic is also not available in the existing technology. By using the high-temperature heat energy of slag, through reasonable control of the temperature, composition or atmosphere of slag, it can be directly cooled to form artificial granite stone, which greatly reduces the product cost and is conducive to the realization of cheap The large-scale application of artificial stone and the energy-saving and high value-added utilization of iron-containing slag obtained by pyrometallurgy have opened up new fields for industrial energy conservation and environmental protection.

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