Alkali-activated high-volume tailings cement brick and preparation method thereof

Abstract

The invention discloses an alkali-activated high-volume tailing mud cement brick and a preparation method thereof, belonging to the technical field of building materials; the raw materials of the cement brick include 450-550 parts of tailing mud and 150-500 parts of fly ash in parts by weight. 250 parts, 80-120 parts of cement, 80-120 parts of iron ore tailings, 100-150 parts of water, 40-50 parts of alkali activator and 5-10 parts of water reducer; the tailings are iron ore beneficiation tailings The alkali activator is composed of quicklime, gypsum and sodium silicate; each raw material is weighed by weight and mixed to obtain a cementitious material, and then molded to obtain an alkali-activated high-volume tailings cement brick; the present invention utilizes quicklime, Gypsum and sodium silicate are combined to obtain an alkali stimulator, which can effectively activate the active ingredients in the iron ore dressing tailings and transform them into substances with better cementation properties, thereby making them compatible with fly ash, iron ore tailings and The cement is effectively gelled, and the mechanical properties of the obtained cement bricks are excellent.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an alkali-activated high-volume tailings cement brick and a preparation method thereof. Background technique [0002] Various factors such as the rapid development of the modern social economy, the acceleration of industrialization, the improvement of the level of urbanization and the upgrading of people's consumption level have led to the rapid growth of the demand for steel in modern society, and the steel industry has achieved rapid development. However, due to the large-scale mining of iron ore, the tailings slag produced after iron ore mining is also increasing day by day. At present, the utilization rate of iron ore tailings is low, and most of the iron ore tailings are discarded and stockpiled. However, the discarding and stockpiling of iron ore tailings not only takes up a lot of land resources, but also affects the surrounding ecological environmen...

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Problems solved by technology

When iron ore tailings are used as raw materials in the existing cement brick preparation process, the amount of iron ore tailings added is less, and the general content is only about 10wt%. When it is used, the gelling performance will be significantly reduced, and the gelation cannot be achieved well, or even if the cement brick is gelled, its compressive strength and cracking strength are also low, and it cannot be used well. Therefore, it is necessary to develop a A cement brick preparation process that can increase the doping amount of iron ore tailings and at the same time enable the resulting cement bricks to have high mechanical properties is of great significance for the preparation of cement bricks and the rational utilization of iron ore tailings

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