Method for quantitatively detecting calcium chromate in vanadium slag calcium roasting clinker

A technology of calcification roasting and calcium chromate, applied in the field of metallurgy and chemical industry, can solve the problems of calcium chromate generation and quantitative analysis of calcium chromate, etc.

Active Publication Date: 2022-02-08
NORTHEASTERN UNIV
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Problems solved by technology

However, due to the use of additive calcium salt, there is still a hidden danger of generating calcium chromate during the calcification and roasting of vanadium slag. Therefore, the quantitative detection of calcium chromate during the calcification and roasting of vanadium slag is particularly important. However, most researchers only focus on the leaching rate of chromium. There is no related research on the quantitative analysis of calcium chromate

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  • Method for quantitatively detecting calcium chromate in vanadium slag calcium roasting clinker

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Embodiment 1

[0033] A method for quantitative detection of calcium chromate in vanadium slag calcified roasting clinker, comprising the steps of:

[0034] (1) Calcium chromate standard substance preparation: chemically pure chromium trioxide is mixed with chemically pure calcium oxide, and the mixing ratio is n(CaO) / n(Cr 2 o 3 ) = 2.0, mixed and roasted at 850°C for 25h to obtain pure calcium chromate, calcium chromate was subjected to X-ray diffraction, and the XRD diffraction pattern obtained was as follows figure 1 shown. The calcium chromate has a high degree of coincidence with the standard card of its XRD diffraction pattern, and there are no diffraction peaks of calcium oxide and chromium trioxide. The pure substance of calcium chromate obtained was detected by scanning electron microscopy, and calcium oxide and trioxide were not found in the energy spectrum analysis of the electron microscope. Dichromium pure substance, the obtained calcium chromate pure substance is used as a st...

Embodiment 2

[0041] A method for quantitative detection of calcium chromate in vanadium slag calcified roasting clinker, comprising the steps of:

[0042] (1) Calcium chromate standard substance preparation: the ratio of analytical pure chromium trioxide and analytical pure calcium oxide according to the amount of substance is n(CaO) / n(Cr 2 o 3 ) = 2.0 for mixing, after mixing, roast at a constant temperature of 800°C for 24 hours to obtain a pure substance of calcium chromate. After testing, the calcium chromate has a high degree of coincidence with its standard card, and there are no diffraction peaks of calcium oxide and chromium trioxide; Analysis did not hit calcium oxide and chromium trioxide pure substances.

[0043] (2) Standard medium selection: Take 3g of calcium chromate and add 30ml of sulfuric acid solution with a volume fraction of 7.5% to dissolve and leach for 1h, dissolve and separate the solid and liquid by filtration, collect the leaching solution and add water to dilut...

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Abstract

The invention relates to a method for quantitatively detecting calcium chromate in vanadium slag calcification roasting clinker. The method comprises the following steps: preparing a calcium chromate standard substance, selecting a standard medium, dissolving and leaching the obtained calcium chromate standard substance, marking the total chromium concentration in the obtained leachate as C1, leaching and dissolving the calcium chromate standard substance in an actual vanadium slag calcification vanadium extraction acid leaching medium, detecting and recording the chromium concentration in the leachate as C2, and calculating the acid leaching coefficient psi = C2/C1; enabling the vanadium slag calcium roasting clinker to be subjected to a leaching experiment, and obtaining the chromium concentration in a leaching solution; and dividing the total chromium concentration in the obtained leachate by the acid leaching coefficient psi to obtain the total chromium concentration under the condition that the calcium chromate is completely dissolved, and further calculating the generation amount of the calcium chromate in the roasted clinker. According to the method, the generation condition of calcium chromate in the vanadium slag calcification roasting process is quantified on the basis of the acid leaching coefficient, the problem that calcium chromate is difficult to quantitatively characterize at present is solved, and a basis is provided for large-scale utilization of a vanadium slag calcification vanadium extraction process.

Description

technical field [0001] The invention relates to a method for quantitatively detecting calcium chromate in vanadium slag calcified roasting clinker, which belongs to the technical field of metallurgy and chemical industry. Background technique [0002] Vanadium is an important strategic metal in my country. Vanadium and its compounds are widely used in metallurgy, chemical industry, aerospace and other fields. Vanadium-titanium magnetite is currently the most important raw material for extracting vanadium in the world, and 88% of the annual output of vanadium comes from vanadium-titanium magnetite. After blast furnace ironmaking and converter oxygen blowing in this ore, most of the vanadium is enriched in the vanadium slag, and the vanadium grade in the vanadium slag (in V 2 o 5 Total) up to 10% to 14%. In addition, the chromium in the vanadium-titanium ore also enters the vanadium slag after the blast furnace-converter process due to its similar properties to vanadium. E...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/73G01N21/31G01N23/2055C22B1/02
CPCG01N21/73G01N21/3103G01N23/2055C22B1/02G01N2223/056G01N2223/1016Y02P10/20
Inventor 温婧姜涛孙红艳余唐霞李林陈泊键
Owner NORTHEASTERN UNIV
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