A semi-dry method for preparing high-strength α-hemihydrate gypsum
A semi-hydrated gypsum and semi-dry technology, which is applied in the field of building materials, can solve the problems of high equipment investment, large component fluctuations, and high production costs, and achieve the effects of reducing environmental pollution, reducing heat loss, and small equipment investment
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Embodiment 1
[0035] The gypsum raw material is natural dihydrate gypsum, the particle surface modifier in the modifier is sodium metaaluminate, and the crystal modifier for adjusting the dissolution and crystallization habit in the modifier is commercially available powdered melamine water reducing agent. agent, polyglycerin and sodium glutarate. Prepare α-hemihydrate gypsum by semi-dry method as follows:
[0036] (1) Material preparation: crush 2000g of dihydrate gypsum to a particle size below 2mm; mix 18g of particle surface modifier sodium metaaluminate (0.9% of the mass of dihydrate gypsum), 8g of crystal form modifier melamine superplasticizer 1. 1 g of polymerized glycerin and 1 g of sodium glutarate (0.5% of the mass of dihydrate gypsum in total) were dissolved in 150 g of water to make 178 g of modifier aqueous solution with a water content of 84.3%;
[0037] (2) Preparation of wet material: Mix 2000g of dihydrate gypsum granular material with a particle size below 2mm obtained i...
Embodiment 2
[0043] The gypsum raw material is natural dihydrate gypsum, the particle surface modifier in the modifier is polymerized silica sol, and the crystal form modifier for adjusting the dissolution and crystallization habit in the modifier is commercially available powdered sodium naphthalenesulfonate water reducing agent. agent, polyethylene glycol ether, polymerized glycerin. Prepare α-hemihydrate gypsum by semi-dry method as follows:
[0044] (1) Material preparation: crush and grind 2000g of dihydrate gypsum into 80 micron sieve with 18% powder; add 18g of particle surface modifier polymerized silica sol (0.9% of the mass of dihydrate gypsum), crystal form modification 10g of sodium naphthalenesulfonate superplasticizer, 1g of polyethylene glycol ether, and 1g of polyglycerol (0.6% of the mass of dihydrate gypsum in total) were dissolved in 200g of water to prepare 230g of modifier aqueous solution with a water content of 86.9%;
[0045] (2) Preparation of wet material: mix 20...
Embodiment 3
[0051] The gypsum raw material is phosphogypsum, the particle surface modifier in the modifier is polymerized silica sol, and the crystal form modifier for adjusting the dissolution and crystallization habit in the modifier is commercially available liquid sulfamate water reducer, poly Glycol ethers, Polyglycerin. Prepare α-hemihydrate gypsum by semi-dry method as follows:
[0052] (1) Preparation: add 2000g of granular phosphogypsum to lime (40g) equivalent to 2% of the weight of phosphogypsum, mix and age for 3 days to neutralize the soluble phosphate and fluorophosphate in phosphogypsum, and then crush it to the particle size 2mm or less; 16g of particle surface modifier polymerized silica sol (0.8% of the mass of phosphogypsum), 12g of crystal form modifier sulfamate water reducer, 1g of polymerized glycerin, and 1g of polyethylene glycol ether (total 0.7% of the mass of phosphogypsum) was dissolved in 200g of water to make 230g of modifier aqueous solution with a moistur...
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