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...

AI Technical Summary

Problems solved by technology

[0007] In order to solve the problem that semi-dry desulfurization gypsum is difficult to comprehensively utilize due to its complex composition, the present invention proposes to use semi-dry desulfurization gypsum and blast furnace slag as main raw materials to produce dry-mixed mortar, and the cementitious material of dry-mixed mortar is partially or entirely made of solid Waste, without adding cement, makes the mortar have a bonding effect, hardens and produces high strength, and also has good durability and water resistance

In order to overcome the problem of increased cost caused by replacing natural gypsum with desulfurized gypsum as a raw material for cement production and as an admixture for concrete according to the traditional method