Determination method for contents of CaCO3, CaSO4 and (NH4)2SO4 in calcium carbonate filter cake
A technology of 2SO4, determination method, applied in the preparation of test samples, material analysis by observing the effect on chemical indicators, thermal excitation analysis, etc.
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[0036] Wengfu Phosphate Fertilizer Plant has a scale of 250,000 tons of P 2 o 5 / year The device that uses phosphogypsum as raw material to produce ammonium sulfate adopts this method for the determination of calcium carbonate, calcium sulfate, ammonium sulfate and other mixtures.
[0037] The specific method is:
[0038] (1) Weigh 0.6004g of a sample that has been dried to constant weight at (105±5)°C, place it in a 250mL beaker, and add a little water to moisten it. Cover with a watch glass, add hydrochloric acid (1+1) dropwise until the sample is completely dissolved, filter and wash with medium-speed filter paper, collect the filtrate and washing solution in a 250mL volumetric flask, and shake to a constant volume. Pipette 25.00mL test solution into a 250mL Erlenmeyer flask, add 5mL triethanolamine (1+3), 25mL water and a small amount of calcium carboxylic acid indicator, use NaOH solution (100g / L) to make wine red, and add 0.5mL , Titrate with (0.0199mol / L) EDTA standa...
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