A method for preparing calcium sulfate dihydrate whiskers from tin smelting waste slag
A technology of calcium sulfate dihydrate and waste residue, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve problems such as poor acid resistance, achieve high added value, solve environmental problems, and simple operation
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Embodiment 1
[0030] A method for preparing calcium sulfate dihydrate whiskers from tin smelting waste residue, the method may further comprise the steps:
[0031] a. Pretreatment Use tin smelting waste slag produced by a non-ferrous metal enterprise in Zhejiang as raw material, and use crushing equipment to crush the slag raw material into slag powder with a particle size of ≤75 μm for later use; 2 The chemical composition of is respectively 22.13wt%, 16.45wt% and 45.40wt%;
[0032] b. Mixing Add 100g of slag powder into a reactor filled with 2L of water, and stir the suspension evenly so that the slag slurry is fully mixed evenly;
[0033] c. Hydrochloric acid leaching. Heat the slag slurry to 40°C, add 300mL of hydrochloric acid, control the hydrochloric acid addition rate so that the acidity of the system is at pH 1, continue stirring for 1 hour after the addition of hydrochloric acid, filter after the reaction, and use the filter residue to prepare sulfuric acid Barium, the main compo...
Embodiment 2
[0042] A method for preparing calcium sulfate dihydrate whiskers from tin smelting waste residue, the method may further comprise the steps:
[0043] a. Pretreatment Use tin smelting waste slag produced by a non-ferrous metal enterprise in Zhejiang as raw material, and use crushing equipment to crush the slag raw material into slag powder with a particle size of ≤75 μm for later use; 2 The chemical composition of is respectively 44.29wt%, 8.45wt% and 39.35wt%;
[0044] b. Mixing Add 1kg of slag powder into a reactor filled with 20L of water, and stir the suspension evenly, so that the slag slurry is fully mixed evenly;
[0045] c. Hydrochloric acid leaching Use hot air at 50°C to heat the suspension slag slurry to 40°C, use a pump to transport the hydrochloric acid in the storage tank to the reactor, add 3L of hydrochloric acid, and control the hydrochloric acid drop rate so that the acidity of the system is at the pH value After the hydrochloric acid is added dropwise, conti...
Embodiment 3
[0051] A method for preparing calcium sulfate dihydrate whiskers from tin smelting waste residue, the method may further comprise the steps:
[0052] a. Pretreatment Use tin smelting waste slag produced by a non-ferrous metal enterprise in Zhejiang as raw material, and use ore crusher equipment to crush the slag raw material into slag powder with a particle size of ≤75 μm for later use; CaO, BaO and SiO in the slag waste 2 The chemical composition of is respectively 44.29wt%, 8.45wt% and 39.35wt%;
[0053] b. Mixing Add 20kg of slag powder into a reactor filled with 400L of water, and stir the suspension evenly so that the slag slurry is fully mixed evenly;
[0054] c. Hydrochloric acid leaching Use hot air at 50°C to heat the suspension slag slurry to 40°C, use a pump to transport the hydrochloric acid in the storage tank to the reactor, add 60L hydrochloric acid, and control the hydrochloric acid drop rate so that the acidity of the system is at the pH value After the addit...
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