A kind of imitation granite decorative plate and preparation method thereof

Abstract

The invention discloses a granite-like decorative plate comprising an ardealite substrate and a preparation method thereof. The granite-like decorative plate is prepared from the following components in parts by weight: 30-80 parts of ardealite, 15-60 parts of yellow phosphorus slag, 1-20 parts of cement, and 0.1-10 parts of quick lime. The yellow phosphorus slag, the cement, the quick lime and the ardealite are mixed and aged; therefore, the acidity of the ardealite is eliminated; the content of soluble matters in the ardealite is reduced; the solidification property of the ardealite is increased; by means of addition of the cement, the solidification property of the ardealite is further increased; the ardealite is modified and subjected to hydration reaction with the yellow phosphorus slag so as to generate a main product, namely ettringite crystals; and therefore, the strength and the water resistance of the granite-like decorative plate are obviously increased.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a granite imitation decorative board and a preparation method thereof. Background technique [0002] In the phosphoric acid production process, every ton of P produced 2 o 5 Five tons of phosphogypsum are produced by-product, and the annual by-production of phosphogypsum by medium-sized phosphoric acid production enterprises is about 3.5 million tons. So much phosphogypsum not only requires a large slag dump, but also causes water pollution. At present, the most commonly used phosphogypsum treatment methods are as follows: [0003] The first method: Phosphoric acid paste is used to backfill the pit. According to statistics, when phosphogypsum is not used to backfill the mine shaft, the filling cost of the mine shaft accounts for 1 / 3 of the mining, and the filling material accounts for 80% of the filling cost. If phosphogypsum is used to fill the mine shaft, the fil...

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Problems solved by technology

The crystal form of phosphogypsum is the same as that of natural gypsum, which is a prismatic or columnar plate crystal, and its chemical composition is basically similar to that of natural gypsum. Phosphorus and organic impurities will prolong the hydration time of cement, reduce the early strength and prolong the setting time, so phosphogypsum cannot be directly used as a retarder for cement

Phosphogypsum needs to be processed. The current common method is to process phosphogypsum through washing, pretreatment, drying and calcination. This method is low in cost to obtain cement retarder, but the process of producing cement retarder from phosphogypsum is long. , the equipment investment is large, and the flocculant still inevitably contains phosphorus pentoxide and fluoride, which makes the hydration time and coagulation time of cement longer

[0005] The third method: making ammonium sulfate and calcium carbonate from phosphogypsum. This method uses ammonia and carbon dioxide to convert phosphogypsum into ammonium sulfate and calcium carbonate. Big

At present, phosphogypsum is usually mixed with a small amount of cement, pulp, fiber reinforced materials, etc., and then pressurized to make phosphogypsum fiberboard. Because phosphogypsum itself does not have gelling properties, high water content, and contains various impurities, etc. , the wear resistance, weather resistance, compressive strength and other properties of the phosphogypsum imitation granite decorative board produced by this method are low, and it is difficult to meet the use requirements of building decoration materials

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