Method for preparing sandstone aggregate from manganese-silicon alloy hot-melt slag and application of sandstone aggregate

Abstract

The invention relates to a method for preparing sandstone aggregate from manganese-silicon alloy hot melt slag. A heat preservation mold body with an opening in the top and a trapezoidal groove body structure as a whole and a heat preservation cover capable of covering the opening are adopted as a mold; liquid manganese-silicon alloy hot melting slag generated in manganese-silicon alloy productionis poured into the mold body; the heat preservation cover covers the opening of the mold body, standing is conducted for 12-36 h, then demolding is conducted, and a pouring block is obtained; by carrying out three-stage crushing on the prepared pouring block, a crushed material is obtained; by screening the crushed material to remove particles and powder of which the particle size does not meet the requirement, and finally coarse aggregate or fine aggregate is prepared; and the coarse aggregate or the fine aggregate is put into a sand making machine to prepare the sandstone aggregate suitablefor concrete or mortar. By adopting the method for preparing the sandstone aggregate, the brittleness of the manganese-silicon alloy slag is effectively reduced, the roughness of the surface of the sandstone aggregate is improved, the good adhesion degree of concrete or mortar is kept, and secondary utilization of the manganese-silicon alloy slag is effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of manganese-silicon slag treatment, and in particular relates to a method and application for preparing sand and gravel aggregate by using manganese-silicon alloy hot slag. Background technique [0002] Manganese-silicon alloy is a composite deoxidizer commonly used in steelmaking. Almost all steel types need to use manganese for deoxidation. Since 2018, the output of pig iron and crude steel in the country has shown positive growth, so the demand for manganese-silicon alloy remains high. Manganese-silicon alloy slag is a kind of blast furnace slag formed by water quenching the high-temperature slag discharged during the smelting process of manganese-silicon alloy. For every ton of manganese-silicon alloy produced, about 1.2-1.3 tons of manganese-silicon alloy slag is produced, and a large amount of solid waste Has become a major environmental polluter. On January 1, 2018, the "Environmental Protection Tax...

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Problems solved by technology

On January 1, 2018, the "Environmental Protection Tax Law of the People's Republic of China" came into effect, increasing the taxation of industrial solid waste piled up, and paying 25 yuan for the storage, disposal and resource utilization of metallurgical slag that does not meet the regulations The environmental protection tax per ton will bring new burdens to enterprises

[0003] At present, the conventional treatment of manganese-silicon alloy slag is to water-quench it, then smelt it with other additives, pour it, cool it and solidify it, break it, and then add it to concrete or mortar according to engineering requirements; this method has the following problems: 1. The water quenching process of manganese-silicon alloy slag consumes a lot of water resources, resulting in a lot of waste of water resources; 2. The discharge temperature of hot-melt manganese-silicon alloy slag is about 1500 ℃, and every ton of hot-melt manganese-silicon alloy slag The heat content is about 1.8GJ. The heat is consumed during the water quenching process, and it needs to be heated again when it is melted again, resulting in the loss of heat energy and excessive consumption of resources; 3. The manganese-silicon alloy slag after water quenching is light Porous structure, manganese-silicon alloy slag with porous structure has a limited application range after crushing, and can only be used in some places that require lightweight aggregates

[0004] While the manganese-silicon alloy slag is directly cooled and solidified naturally, it will form such as figure 2 The vitreous body shown is relatively brittle and has a smooth surface. It is added to the concrete as a concrete aggregate, and it is not easy to grout during the mixing process. It has poor adhesion to the cement and fine aggregate in the concrete, and the workability is not ideal; and, There are many needles and flakes produced during the glass breaking process, the pulverization rate is high, and it is difficult to separate from qualified products

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