Desulfurized gypsum.phosphorous gypsum without roasting, extruding gypsum block and production method thereof
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A technology for desulfurized gypsum and gypsum blocks, applied in chemical instruments and methods, sustainable waste treatment, solid waste management, etc., can solve the problems of low strength, unstable product quality, easy breakage, etc., and achieve improved strength and water resistance. , Good freeze-thaw resistance and reasonable crystal shape
Inactive Publication Date: 2010-09-15
SHANGHAI JINMA BUILDING MATERIALS
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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: fir...
Method used
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[0042] ① Pre-mix dry powdery slag micropowder S95, fly ash grade II, cement grade 32.5, calcium oxide, and sodium sulfate for mixed grinding or ball milling, with a fineness ≥ 250 mesh or more, to increase activity, as the core masterbatch, bagged use.
[0043] ②During production, put the piled dihydrate desulfurized gypsum with attached water content ≤ 10%, through vibrating sieve (￠5mm), and measure into the mixer with core masterbatch, glass fiber, slag and expanded perlite respectively, add water and stir (Water consumption varies due to the water content attached to the desulfurized gypsum, so field tests are...
[0061] When producing gypsum blocks, phosphogypsum is required to be mixed with desulfurized gypsum, accounting for 50% each. This can overcome or reduce the phosphogypsum products: 1. low strength; 2. slow initial setting; 3. radioactivity not up to standard;
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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 ...
Claims
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Application Information
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