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Determination method of calcium hydroxide content in carbide slag

A calcium hydroxide and determination method technology, applied in the field of slag analysis, can solve problems such as no determination method, achieve the effects of reducing reagent consumption and labor costs, stable methods, and reduced losses

Inactive Publication Date: 2019-06-04
INNER MONGOLIA BAOTOU STEEL UNION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main component of calcium carbide slag is calcium hydroxide. However, there is no standard method for the determination of calcium hydroxide in carbide slag. Therefore, it is of great significance to accurately determine calcium hydroxide in carbide slag.

Method used

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Embodiment Construction

[0022] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below in conjunction with the embodiments.

[0023] 1. Method summary: Dissolve the sample in a 300mL beaker with hydrochloric acid (25%), remove it, and add 50mL triethanolamine (12%) after cooling (must be the first to add, in order to firstly remove the interference of iron and aluminum, etc. Element masking), add 50mL water, add a little hydroxylamine hydrochloride, (further masking effect), add 30mL potassium hydroxide solution (20%), (buffer solution effect), add a few drops of magnesium sulfate (0.5%) (make the end point look good ), an appropriate amount of calcein, and titrate with EDTA standard solution until the fluorescent green disappears as the end point.

[0024] 2. Reagents:

[0025] 2.1 hydrochloric acid (25%)

[0026] 2.2 Hydroxylamine hydrochloride (solid)

[0027] 2.3 Triethanolamine (12%)

[0028] 2.4 Potassium hydroxide solu...

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PUM

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Abstract

The invention discloses a method for measuring the content of calcium hydroxide in carbide slag, and aims at providing a method which is short in operating flow, low in cost, quick, efficient, accurate, high in stability and easy to master and is used for measuring the content of calcium hydroxide in the carbide slag. The method comprises the following steps: adding a carbide slag test sample with the mass of m into one flask, and taking the other empty flask as a blank contrast, then respectively adding hydrochloric acid to dissolve the test sample on a low-temperature electrothermal plate, taking down the plate after the test sample is dissolved, cooling the plate, respectively adding triethanolamine, water and hydroxylamine hydrochloride in sequence, adding a potassium hydroxide solution, a several drops of magnesium sulfate and a proper amount of a calcein indicator, and titrating by an EDTA standard solution with the concentration of C until fluorescent green disappears, recording the volumes as V and V0 respectively, and obtaining the content of calcium hydroxide: WCa(OH)2%=C(V-V0)MCa(OH)2100 / m*100.

Description

technical field [0001] The invention relates to the technical field of slag analysis, in particular to a volumetric method for determining calcium hydroxide content in carbide slag. Background technique [0002] Calcium carbide slag, after hydrolysis of calcium carbide to obtain acetylene gas, the waste residue with calcium hydroxide as the main component will be produced. The production of acetylene by the domestic calcium carbide method will inevitably produce auxiliary industrial waste calcium carbide slag (paddle), acetylene (C 2 h 2 ) is one of the important raw materials for basic organic synthesis. Using calcium carbide as raw material, the process of producing acetylene by adding water (wet method) is simple and mature, and currently accounts for a large proportion in my country. Adding water to 1 ton of calcium carbide can generate more than 300 kg of acetylene gas, and at the same time generate 10 tons of industrial stock solution with a solid content of about 12%...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/78
Inventor 李虹刘建华周春玲
Owner INNER MONGOLIA BAOTOU STEEL UNION