Preparation method and equipment of high-strength ardealite block material and pavement brick

Abstract

The invention provides a preparation method and equipment of a high-strength ardealite block material and a pavement brick. The high-strength ardealite block material is prepared from the following components in parts by weight: 100 parts of neutralized and dehydrated ardealite material, 0.5-5 parts of cement powder, 1-5 parts of silicate mineral powder, 0.5-5 parts of volcanic ash active powder, 0.1-0.2 part of retarder and 0.06-0.1 part of water-retaining agent. The water accounts for 9-13% of the weight of the mixture; and the particle sizes of the silicate mineral powder and the volcanic ash active powder are less than 1 mum. The preparation method comprises the following steps of preparing a shell from impervious cement concrete, and putting a high-strength phosphogypsum block material into the impervious cement concrete shell, feeding from the top of the impervious concrete, and pressing into pavement bricks under 15-20MPa, and performing steam curing for 3-4 days to obtain the high-strength high-content phosphogypsum pavement brick. The production line for preparing the phosphogypsum pavement brick is sequentially provided with a shell feeding station, a shell forming station, a block material placing station, a top feeding station and a pavement brick pressing station. The compressive strength of the prepared pavement brick exceeds 30 MPa.

Description

technical field [0001] The invention relates to the field of phosphogypsum reuse, in particular to a preparation method and equipment for high-strength phosphogypsum blocks and pavement bricks. Background technique [0002] Phosphogypsum is an industrial solid waste discharged from the wet-process phosphoric acid production process. In the production process of wet-process phosphoric acid, usually every ton of phosphoric acid is produced, with 100% P 2 o 5 According to calculation, about 4.5-5.5 tons of phosphogypsum will be produced. The main component of phosphogypsum is calcium sulfate dihydrate (CaSO 4 • 2H 2 O), and a small amount of other impurities. [0003] In the prior art, there are schemes of sintering phosphogypsum to make bricks, such as the methods described in Chinese patent documents CN1381423A, CN1465540A, CN101774797A, CN102503517A, CN103044007A, etc., which require continuous firing at a high temperature of 700-900°C for not less than 30 hours. There...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a preparation method of pavement bricks, which can be continuously used in outdoor environments, and the compressive strength is reduced by less than 0.5% after 30 days of water soaking test

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