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.

Inactive Publication Date: 2012-10-24
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no CaCO in the calcium carbonate filter cake of the phosphogypsum ammonium sulfate plant

Method used

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  • Determination method for contents of CaCO3, CaSO4 and (NH4)2SO4 in calcium carbonate filter cake
  • Determination method for contents of CaCO3, CaSO4 and (NH4)2SO4 in calcium carbonate filter cake
  • Determination method for contents of CaCO3, CaSO4 and (NH4)2SO4 in calcium carbonate filter cake

Examples

Experimental program
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Embodiment

[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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Abstract

The present invention discloses a determination method for a mixture comprising calcium carbonate, calcium sulfate, ammonium sulfate and the like, wherein the total calcium content, the total nitrogen content and the total sulfur content in the mixture are determined to represent concentration of the mixture. The method comprises: (1) determining the total calcium content, wherein a sample is titrated by using EDTA to determine the total calcium content; (2) adopting a Kjeldahl azotometer to carry out distillation, and carrying out titration to determine the total nitrogen content; and (3) treating the sample, then adopting a whole spectrum direct reading plasma emission spectrometer (ICP-OES) with a pre-calibrated working curve to determine sulfur content to obtain a concentration, calculating the total sulfur content, and respectively calculating ammonium sulfate content and calcium sulfate content according to a formula. With the method of the present invention, difficulties of determinations of CaCO3 content, CaSO4 content and (NH4)2SO4 content in a calcium carbonate filter cake of an ammonium sulfate preparation apparatus using phosphogypsum are overcome. In addition, the method of the present invention is suitable for enterprises adopting phosphogypsum as a raw material to produce ammonium sulfate.

Description

technical field [0001] The present invention relates to mixtures, in particular to CaCO in ammonium carbonate filter cakes 3 , CaSO 4 , (NH 4 ) 2 SO 4 method for the determination of content. Background technique [0002] The production process of ammonium sulfate from phosphogypsum is based on phosphogypsum, ammonia, and carbon dioxide as raw materials, and the process of double decomposition with calcium sulfate and ammonium carbonate. The reaction process is: 2NH 3 +H 2 O+CO 2 =(NH 4 ) 2 CO 3 , (NH 4 ) 2 CO 3 +CaSO 4 2H 2 O=(NH 4 ) 2 SO 4 +CaCO 3 . After the mixture of ammonium sulfate, calcium carbonate and incompletely reacted calcium sulfate produced by the reaction is filtered and separated, a certain amount of calcium carbonate filter cake is obtained. In the national standard library, there is no CaCO in the calcium carbonate filter cake of the phosphogypsum ammonium sulfate plant 3 , CaSO 4 , (NH 4 ) 2 SO 4 Content determination test stand...

Claims

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Application Information

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IPC IPC(8): G01N21/79G01N21/71G01N1/44G01N1/38
Inventor 赵清张世亚杨宏
Owner WENGFU (GRP) CO LTD
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