Hydrogen peroxide foamed phosphogypsum lightweight building block and preparation method thereof

Abstract

The invention relates to a hydrogen peroxide foamed phosphogypsum lightweight building block and a preparation method thereof. The building block comprises the following components in parts by weight: 60 to 80 parts of high strength phosphogypsum, 10 to 30 parts of fly ash, 1 to 5 parts of quicklime, 1 to 5 parts of hydrogen peroxide, 2 to 8 parts of light aggregate, 2 to 8 parts of fiber, 0.5 to 2 parts of calcium stearate, 0.1 to 0.5 part of activator, 0.05 to 0.25 part of retarder, and 0.05 to 0.15 part of water-retaining agent. The building block and preparation method have the following advantages: (1) the building block is light and has a thermal insulation property, the dry density is 300-600 kg / m3, and the thermal conductivity is 0.1 W / (m.K); (2) the setting time is short, the early strength is high, the initial setting time is less than 100 minutes, and the compressive strength can reach at least 80% within 2 hours; (3) the softening coefficient is high and can reach 0.7 or more; (4) the preparation technology is simple, the industrial wastes are effectively utilized, and thus the preparation method is green and environment-friendly.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a hydrogen peroxide foamed phosphogypsum lightweight block and a preparation method thereof. Background technique [0002] Phosphogypsum is an industrial by-product of the wet production of phosphoric acid, which is composed of apatite or fluorine-containing apatite Ca 5 F(PO 4 ) 3 One of the products obtained by reacting with sulfuric acid. The main component of phosphogypsum is calcium sulfate dihydrate, every ton of P 2 o 5 About 4.5-5.5 tons of phosphogypsum will be discharged. The way the factory disposes of phosphogypsum is mainly stockpiling, which not only takes up a lot of land, but also causes serious environmental pollution. According to incomplete statistics, so far the cumulative emissions of phosphogypsum in 58 countries around the world have reached 5.6 billion tons, an increase of 110 to 150 million tons per year, and the increase will...

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Problems solved by technology

[0004] Chinese patent CN201210264276.1 discloses a foamed gypsum block and its manufacturing method. The foamed gypsum block is prepared from gypsum material, air-entraining agent and water. It has good water resistance, high strength, good sound insulation effect, and is not easy to Cracking and other advantages, but the cost of foaming is high and the preparation process is relatively complicated

Chinese patent CN201310134654.9 discloses low-density and high-strength foamed gypsum, which is mainly composed of gypsum powder, rubber polymer latex, starch, surfactant, foaming agent, etc., and has small bulk density, high strength, light weight, thermal insulation And other advantages, but poor water resistance, low strength

Chinese patent CN201410192734.4 discloses a manufacturing method and device for foamed gypsum block cast-in-place walls. The product is energy-saving and environmentally friendly, safe and reliable in quality, simple in process, advanced in device, and high in production efficiency, but the product itself has poor performance

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