Desulfurized gypsum.phosphorous gypsum without roasting, extruding gypsum block and production method thereof

Abstract

The invention provides dihydrate desulfurized gypsum.phosphorous gypsum without roasting, which is applied to the technical filed of solid waste resource utilization of generating plants and phosphate fertilizer plants and used for preparing water extrusion-resistant gypsum blocks with high strength. The dihydrate desulfurized gypsum.phosphorous gypsum without roasting comprises the following components by weight percent: 60-80% of desulfurized gypsu.phosphorous gypsum, 10-25% of pozzuolana active mineral material, 5-15% of activating material, 0.5-2% of coagulation accelerator, 0.2-1% of intensifier and 30-50% of light aggregate. The preparation method of the invention is as follows: carrying out vibration screening on subhumid original desulfurized gypsum.phosphorus gypsum, mixing and stirring with powder grinded active mineral material, exciting material, coagulation accelerator, reinforcing material, intensifier lightweight aggregate and proper amount of water, extruding and moulding, muggy maintaining and naturally maintaining. In comparison with the traditional methods of gypsum building blocks produced by sintered and cast beta-hemihydrate gypsum, the invention has higher intensity, lower breakage rate, better water-proof performance and higher coefficient of softening, is characterized by stable performance, low cost and easy popularization, and is uneasy to rot roots and crack, thus being applied to indoor separating walls and partitions.

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 of thermal power plants - desulfurization gypsum; solid waste produced by phosphate fertilizer plants - phosphogypsum, without pre-treatment, through the implementation of chemical and physical processes without calcination The reaction mechanism is modified to prepare a high-strength, water-resistant extrusion-type gypsum block. 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 ...

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

The problems brought about: first, the investment in equipment is large, including calcination and processing production equipment; second, the strength is poor, easy to break, missing corners and edges; third, it is not resistant to water, and the roots are easy to rot, which affects the use of the market; fourth, is costly

People have greatly discounted its use concept, so it restricts the wide-scale promotion and application