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Preparation method and equipment of high-strength ardealite block material and pavement brick
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A phosphogypsum, high-strength technology, applied in the direction of manufacturing tools, molding indenters, ceramic molding workshops, etc., can solve problems such as the reduction of compressive strength
Active Publication Date: 2021-09-07
HUBEI YITONG CONSTR ENG CO LTD
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[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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Embodiment 1
[0045] Components in parts by weight: 1000 grams of neutralized dehydrated phosphogypsum material, 5 grams of cement powder, 10 grams of silicate mineral powder, 5 grams of pozzolan active powder, 1 gram of retarder, and 0.6 gram of water-retaining agent;
[0046] Water is 9% of above-mentioned mixture weight ratio;
[0047] Among them, the particle size of silicate mineral powder and volcanic ash active powder is less than 1 μm.
[0048] The neutralized dehydrated phosphogypsum material is hemihydrate phosphogypsum neutralized material prepared by mixing quicklime, which is a commercially available product of Hubei Sanning Chemical Co., Ltd.
[0049] The cement powder is ordinary C30 cement.
[0050] The silicate mineral powder is hydrated silicate nanopowder. The average particle size is less than 1 μm. Preferably, the average particle size is less than 500nm. A further preferred average particle diameter is less than 100 nm.
[0060] Components in parts by weight: 1000 grams of neutralized dehydrated phosphogypsum material, 30 grams of cement powder, 20 grams of silicate mineral powder, 30 grams of pozzolan active powder, 2 grams of retarder, and 10 grams of water-retaining agent;
[0061] Water is 11% of above-mentioned compound weight ratio;
[0062] The preparation steps are the same as in Example 1, and the compressive strength of the high-strength phosphogypsum block obtained by this scheme is 25.5 MPa.
Embodiment 3
[0064] Components in parts by weight: 1000 grams of neutralized dehydrated phosphogypsum material, 30 grams of cement powder, 20 grams of silicate mineral powder, 30 grams of pozzolan active powder, 2 grams of retarder, 10 grams of water-retaining agent, and 20 grams of fibergram;
[0066] Water is 11% of above-mentioned compound weight ratio;
[0067] S1, fully mixing the neutralized dehydrated phosphogypsum material, the silicate mineral powder and the pozzolan active powder to obtain the phosphogypsum mixture;
[0068] S2. Fully break up the fiber with a shear pump, the length is 5~10mm, fully mix the fiber, cement powder, retarder and 20% of the total water, and then fully mix with the phosphogypsum mixture, and finally add the remaining water Mix with water retaining agent to obtain phosphogypsum pressed material;
[0069] S3, pressed under 20MPa to form a block sample;
[0070] A high-strength phosphogypsum block is...
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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 cementpowder, 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 calciumsulfate 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...
Claims
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Application Information
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