Calcining-free desulfurization gypsum/phosphogypsum self-insulation gypsum brick and production method thereof

Abstract

The invention discloses a high-strength waterproof self-insulation gypsum brick prepared by using calcining-free desulfurization gypsum dihydrate / phosphogypsum in the technical field of solid waste recycle of a power plant or a phosphate fertilizer plant and a production method thereof. The brick comprises the following components in percentage by weight: 60 to 80 percent of original desulfurization gypsum dihydrate / phosphogypsum, 10 to 25 percent of active material of volcanic ash mineral, 5 to 15 percent of exciting material, 0.5 to 2 percent of coagulant material, 100 to 200 percent of aggregate and 25 to 40 percent of light aggregate. The preparation method comprises the following steps of: screening semi-moist desulfurization gypsum dihydrate / phosphogypsum, metering, mixing and stirring the screened semi-moist desulfurization gypsum dihydrate / phosphogypsum, the powdery active mineral material ground into powder in advance, the exciting material, the coagulant material, the aggregate and the light aggregate on site, adding a proper amount of water into the mixture, molding the mixture in a molding machine, and then damply and thermally curing the mixture for 24 hours. The method consumes a large amount of solid waste and reduces secondary energy consumption and secondary pollution; and the product has the advantages of light dead weight, high strength, energy conservation, fire prevention, water resistance, acid and alkali resistance and the like, and is suitable for a separating wall, a partition wall, a filling wall, a toilet and a kitchen.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste. It specifically relates to a kind of solid waste produced after wet desulfurization in thermal power plants - desulfurized gypsum, and solid waste produced in phosphate fertilizer plants - phosphogypsum, without pretreatment, implementing a calcination-free process. Modified to prepare a high-strength, water-resistant self-insulating gypsum brick. Background technique [0002] my country is a big thermal power generation country in the world, every year SO 2 The emission is the first in the world, 25 million tons. The country has adopted mandatory desulfurization measures. By 2010, the desulfurization gypsum produced by desulfurization will reach 50 million tons. In 2009, 50 million tons of solid waste—phosphogypsum—was generated from the production of phosphate fertilizers, and 100 million tons are now in stock. The numbers are staggering. The method of...

AI Technical Summary

Problems solved by technology

The problems brought about are: first, the initial investment in equipment is large and the process is complicated; second, secondary energy consumption and secondary pollution; third, the product is "low in strength and not resistant to water"; fourth, the product quality is unstable and affects the use ; Fifth, the cost is high and not environmentally friendly

[0004] It is found in the retrieval documents that the application number is: 200610150190.0 "A Self-insulating Wall Brick, Block or Porous Brick and Its Preparation Method". ②The solid waste has not been utilized; ③The strength is low; ④The cost is high