Composite cementitious material of desulfurated waste residue and mortar prepared from same

Abstract

The invention relates to the field of building material, and particularly discloses a composite cementitious material of desulfurated waste residue, wherein the composition of the composite cementitious material of desulfurated waste residue comprises ingredients in the following ratios by weight: 25-40% of desulfurated waste residue, 60-75% of industrial chemical gypsum, 0-20% of inorganic mineral additive and 0-2% of chemical additive. The desulfurated waste residue is at least one of dry-process desulfurated ash, wet-process desulfurated gypsum and semidry-process desulfurated ash; the inorganic mineral additive is at least one of cement, fly ash, mineral powder and steel slag; and the chemical additive is at least one of K2SO4, Al2(SO4)3 and alums. The performances such as compressive strength and tensile bond strength of the mortar prepared from the cementitious material are basically the same as the performances of cement mortar, and the mortar can achieve related standards and requirements. In the composite cementitious material of desulfurated waste residue disclosed by the invention, solid waste is efficiently utilized for preparing composite cementitious material high in performances and low in cost by burning-free treatment process and efficient excitation pre-treatment technology, so that pollution can be reduced and energy can be saved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a desulfurization waste slag composite gel material and a mortar material containing the material. Background technique [0002] my country is a country with coal thermal power as the main energy source. SO 2 Become one of the main causes of air pollution, so thermal power plants must implement flue gas desulfurization. Flue gas desulfurization technology can be divided into three categories: wet method, semi-dry method and dry method. With the country's emphasis on power environmental protection, especially the reduction of sulfur dioxide and air pollution, the flue gas desulfurization transformation of thermal power plants in my country has entered a high-speed growth period, resulting in a large amount of desulfurization waste residue. The annual discharge of desulfurization waste residues from Shanghai coal-fired power plants can reach 2 million tons. The waste slag will ...

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Problems solved by technology

The annual discharge of desulfurization waste residue from coal-fired power plants in Shanghai can reach 2 million tons. According to the arrangement of the municipal government's "Shanghai City Desulfurization Gypsum Comprehensive Utilization and Safety Disposal Implementation Plan" Hu Fu Ban [2009] No. 56 document, about 1 million tons of desulfurization Waste slag will find a way out in the cement plant, gypsum board plant and two gypsum calcination demonstration lines, but pretreatment measures such as drying and calcination are required. The pretreatment process consumes a lot of energy, which limits the efficient use of desulfurization waste slag. The extra 100 10,000 tons of desulfurization waste residue, especially the dry desulfurization waste residue has no way of comprehensive utilization

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