Method for producing dry-mixed masonry motar using semidry desulfurized gypsum and blast-furnace slag

Abstract

The invention provides a method which adopts desulfurization gypsum prepared by a semidry method and blast furnace granulating slag to produce dry-mixed masonry mortar, belonging to the field of building materials; the method is characterized in that: the blast furnace granulating slag is dried until the water content thereof reaches 0.01-1% and then is milled till the specific surface area thereof reaches 400-600kg / m<2>; according to proportion by weight, 10-30% of fine milled powder of the blast furnace granulating slag, 10-30% of desulfurization gypsum prepared by the semidry method with water content of 0.1-1% and 60-80% of river sand, hilly sand, desert sand, Gobi sand, marine sand or mine tailing sand with water content of below 0.5% are evenly blended in a batch mixer to produce the dry-mixed masonry mortar. The method of the invention solves the problem that the desulfurization gypsum prepared by the semidry method is difficult to be utilized comprehensively due to complex components; as no gelled materials like cement, lime, and the like, need to be added for preparing the dry-mixed masonry mortar and solid wastes are partially or completely used as the gelled materials, the production cost of the dry-mixed masonry mortar is lower than the traditional mortar which is prepared by taking cement and lime as main gelled materials; therefore, the method of the invention has vital significance for energy saving and emission reduction.

Description

technical field

[0001] The invention belongs to the fields of environmental protection engineering and building materials, and particularly relates to a method for producing dry-mixed masonry mortar by using semi-dry desulfurized gypsum and blast furnace slag. Background technique

[0002] Desulfurization and purification of coal-fired flue gas before discharge into the atmosphere is a rapidly developing environmental protection technology at home and abroad. It has been widely used in various major industrial fields. When lime or slaked lime is used as the desulfurization medium, a large amount of desulfurization gypsum will be produced. Early desulfurization technologies were mainly wet and dry. Wet desulfurization produced a large amount of sludge-like desulfurization gypsum, while dry desulfurization products were generally discharged together with fly ash or slag, and desulfurization gypsum would not be discharged separately . Wet desulfurization gypsum is currently wi...