Method for producing low-alkali micro-expansive moderate heat Portland cement from waste aluminum ore

Abstract

The invention discloses a method for producing low-alkali micro-expansive moderate heat Portland cement from waste aluminum ore. The method comprises the following steps: weighing the following components in parts by weight: 78-83 parts of clinker, 4-6 parts of fly ash waste, 2-3 parts of agar, 6-8 parts of waste aluminum ore powder, and 5-8 parts of desulfurized gypsum, wherein the clinker is produced from the following raw materials in percentage by weight: 85-88% of limestone, 6.5-9% of sandstone, 4.5-7% of aluminum oxide red mud, and 0.05-1% of copper slag; controlling the temperature of the raw materials to a range of at 850-880 DEG C in a decomposing furnace; preparing the clinker by calcining in a rotary kiln revolving at a speed of 3.75-3.85 r / min under the condition of system airdischarging from -7200 Pa to -7500 Pa; and mixing the prepared clinker with the clinker composed of the limestone, the waste aluminum ore powder and the desulfurized gypsum in a weight ratio; and forming the mixed clinker into the micro-expansive moderate heat Portland cement disclosed in the present invention by means of a cement grinding mill. The method for producing low-alkali micro-expansivemoderate heat Portland cement from waste aluminum ore has the advantages that the process is simple, and the product is stable in properties with indexes such as linear expansion rate, hydration heatand the like meeting the anticipated demand, and can be widely used in construction of large-size, high-strength buildings, highway tunnels, culverts and the like.

Description

technical field [0001] The invention belongs to the technical field of dry-process cement production, in particular to a method for producing low-alkali micro-expansion medium-heat portland cement by utilizing aluminum ore waste rock. Background technique [0002] At present, the research on the technology with micro-expansion and medium heat characteristics on the basis of ordinary Portland cement is still at a very low stage. In the existing technology, there are: (1) The linear expansion rate cannot reach the target value. The main reason is that the hydration rate of periclase is too slow, which fails to achieve the result of synchronizing with cement hydration, resulting in low expansion rate during water curing; Stable or out of control form, thus affecting the expansion effect. (2) Technical problems such as the heat of hydration not reaching the target value. [0003] From the perspective of comprehensive utilization of resources, it is of great significance to en...

AI Technical Summary

Problems solved by technology

The main reason is that the hydration rate of periclase is too slow, which fails to achieve the result of synchronizing with cement hydration, resulting in low expansion rate during water curing; Stable or out of control shape, thus affecting the expansion effect

(2) Technical problems such as the heat of hydration failing to reach the target value