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Method for preparing nano-micro sheet/plate shaped pyrite crystals under hydrothermal condition

A technology for plate crystals and iron ore flakes, which is applied in the field of mineral crystal preparation, can solve the problems of no research and practice precedent for controlled preparation, and achieve the effects of easy reaction, controllable preparation, and avoidance of complex processes.

Inactive Publication Date: 2013-02-20
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in previous reports, there is no research and practice precedent for the controlled preparation of pyrite flakes and plate-like crystals under hydrothermal conditions.

Method used

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  • Method for preparing nano-micro sheet/plate shaped pyrite crystals under hydrothermal condition
  • Method for preparing nano-micro sheet/plate shaped pyrite crystals under hydrothermal condition
  • Method for preparing nano-micro sheet/plate shaped pyrite crystals under hydrothermal condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Take ferrous sulfate (FeSO 4 ·7H 2 O) and thioacetamide (CH 3 CSNH 2 ), were placed in volumetric flasks to prepare solutions. Measure the ferrous sulfate solution and the thioacetamide solution respectively, place them in a beaker and mix them thoroughly so that Fe:S=1:3 (amount of substance), and stir them with a glass rod to fully mix them. Take the reactor and add the mixed solution so that the solution accounts for 60% of the volume of the reactor. Control the temperature at 180°C and heat for 24h. After cooling and filtering, a gray-black solid was finally obtained. A pyrite crystal sample was obtained after drying. The morphology of the experimental sample was observed with a SSX-550 scanning electron microscope. At this time, the pyrite crystal sheets and plate-like crystals did not develop well, such as figure 1 shown.

Embodiment 2

[0035] Take ferrous sulfate (FeSO 4 ·7H 2 O) and thioacetamide (CH 3 CSNH 2 ), were placed in volumetric flasks to prepare solutions. Measure the ferrous sulfate solution and the thioacetamide solution respectively, place them in a beaker and mix them thoroughly so that Fe:S=1:4 (amount of substance), and stir them with a glass rod to fully mix them. Take the reactor, add the mixed solution, control the temperature at 200°C and heat for 24h. After cooling and filtering, a gray-black solid was finally obtained. After drying the sample, a pyrite crystal sample was obtained. The morphology of the experimental sample was observed with a SSX-550 scanning electron microscope. At this time, two obvious pyrite flakes and plate crystals appeared in the form of layers and aggregates, such as figure 2 , 3 shown.

Embodiment 3

[0037] Take ferrous sulfate (FeSO 4 ·7H 2 O) and thioacetamide (CH 3 CSNH 2 ), were placed in volumetric flasks to prepare solutions. Measure ferrous sulfate solution and thioacetamide solution respectively, put them in a beaker and mix them thoroughly so that Fe:S=1:3. Stir with glass rod to mix thoroughly. Take the reaction kettle and add the mixed solution. Make the mixed solution account for 60% of the reactor volume. Control the temperature at 200°C and heat for 48h. The reaction kettle was taken out, cooled and filtered to obtain a gray-black solid. After drying, a pyrite crystal sample was obtained. The morphology of the experimental sample was observed with a SSX-550 scanning electron microscope. At this time, pyrite crystal sheets and plate crystals with smooth and flat crystal planes developed, such as Figure 4 shown.

[0038] The hydrothermal method is an experimental method proposed on the basis of the research on the crystallization and growth mechanism...

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Abstract

The invention provides a method for preparing nano-micron pyrite flakes and plate crystals under hydrothermal conditions. It is characterized in that: the method uses ferrous sulfate (FeSO4·7H2O) and thioacetamide (CH3CSNH2) as the main raw materials, mixes the solution prepared by the two substances in a certain proportion, and then reacts; under certain temperature conditions After heating for a certain period of time, flake and plate pyrite with better crystal development can be obtained. The purpose of the present invention is to provide a method for preparing pyrite flakes and plate-shaped crystals, the purpose of which is to make the reaction between ferrous sulfate (FeSO4 7H2O) and thioacetamide (CH3CSNH2) easier and more sufficient, and avoid the waste of raw materials. waste, and realize the controllable preparation of pyrite flakes and plate crystals.

Description

technical field [0001] The invention relates to a method for preparing mineral crystals, in particular to a method for preparing pyrite flakes and plate crystals. Background technique [0002] Pyrite is one of the common sulfides in the earth's crust and is formed in a variety of geological conditions. With the intersection and integration of mineralogy and other disciplines, pyrite has applications in environmental assessment and governance, mineral materials and other fields. However, the natural pyrite has a high impurity content, so it cannot meet the requirements for use. [0003] Through artificially producing high-purity pyrite experiments, it was found that pyrite flakes and plate-shaped crystals can grow under hydrothermal conditions. But in traditional theory and practice, people focus on the crystallization and growth of ordinary pyrite crystals. Some scholars have found through hydrothermal experiments that temperature, supersaturation, oxygen fugacity and su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B29/64C30B7/10
Inventor 黄菲林加磊李光禄李建源
Owner NORTHEASTERN UNIV LIAONING