Method for producing baking-free brick mainly from red mud and magnesium slag by extrusion molding

Abstract

The invention relates to a method for producing a baking-free brick mainly from red mud and magnesium slag by extrusion molding and belongs to the technical fields of comprehensive utilization of solid waste resources and novel building materials. The baking-free brick is produced by the processes of raw material pretreatment, grinding, metering, stirring and primary mixing, forced mixing, extruding, cutting, steam curing and the like. According to the mass ratio of red mud to magnesium slag to active mineral materials (blast furnace slag, yellow phosphorus furnace slag and fly ash) to lime is (45-50): (35-40): (10-15): (2-5); the mass ratio of a batch mixture to water is 100: (32-35); and the active mineral materials can be individually used and can also be mixed and collocated for use. In the batch mixture of the invention, the moisture of red mud can be up to more than 65%; production of a blank can be carried out by using a traditional vacuum extruder, and operation is simple; the product is easy to build, blank hardening speed is high, static curing time is short, occupied field is less, and energy consumption is low; and the product has the advantages of high strength, high carbonization coefficient, high softening coefficient, low water absorption, good damp and hot alternation resistance and frost resisting capacities and no saltpetering.

Description

technical field [0001] The invention relates to a method for producing unfired bricks through extrusion molding of red mud and magnesium slag as main raw materials, and belongs to the technical field of comprehensive utilization of industrial solid waste resources and new building materials. Background technique [0002] Red mud is the solid waste discharged during the alumina production process. According to the different alumina production processes, it is divided into sintering method, Bayer method and mixed method red mud. Due to the different alumina production methods and bauxite quality, the chemical composition, physical properties and mineral phases of red mud are different, but because of the high iron oxide content, its appearance color is similar to laterite, so it is generally called red mud. Regardless of sintering red mud or Bayer red mud, their common characteristics are alkali. Due to the existence of alkali, the utilization of red mud is very difficult, whi...

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Problems solved by technology

[0009] Judging from the overall situation of the utilization of red mud and magnesium slag at home and abroad, it is mainly concentrated on the production of cement or road materials with red mud or magnesium slag as the main raw material or auxiliary raw materials, combined with fly ash, slag, industrial gypsum, etc. , the production of various new wall materials has also been reported in a small amount, but the research and application of extrusion molding technology to produce building unburned bricks with red mud and magnesium slag as the main raw materials have not yet been reported.

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