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A chromium-containing corrosion-inhibiting molten salt and its preparation process

A preparation process and molten salt technology, which is applied in the field of corrosion-inhibiting molten salt and its preparation, can solve the problems of high production costs, and achieve the effects of low production costs, good application prospects, and easy operation

Active Publication Date: 2019-12-03
上海联和日环能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem in the prior art that the production cost of fluoride molten salt and / or chloride molten salt is high when it is corrosive to metal materials at high temperature by adding a divalent compound of chromium, and provides a A kind of low-cost chromium-containing corrosion-inhibiting molten salt and its preparation process

Method used

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  • A chromium-containing corrosion-inhibiting molten salt and its preparation process
  • A chromium-containing corrosion-inhibiting molten salt and its preparation process

Examples

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Embodiment 1

[0045] The matrix molten salt system used in this example is FLiNaK (LiF: KF: NaF=46.5: 11.5: 42mol%) molten salt system; the preparation process of the chromium-containing corrosion-inhibiting molten salt of this embodiment includes the following steps:

[0046] (1) Add 2600ppm CrF to 500 grams of FLiNaK molten salt system in the reaction vessel 3 With 700ppmCr, mix well and heat to melt;

[0047] (2) Pass high-purity H into the reaction vessel at a flow rate of 200mL / min 2 , reacted at 700℃, 1bar for 10 hours

[0048] (3) After the reaction finishes, feed Ar into the reaction vessel to replace the high-purity H 2 , out of the box.

[0049] Cr of the corrosion inhibiting molten salt obtained in this embodiment 2+ The content is 2600ppm, Cr 3+ The content is 120ppm, and the Cr content is 580ppm.

Embodiment 2

[0051] The matrix molten salt system used in this example is a KCl-NaCl (KCl: NaCl=44:56mol%) molten salt system; the preparation process of the chromium-containing corrosion-inhibiting molten salt of this embodiment includes the following steps:

[0052] (1) Add 10000ppm CrCl to the 20 kg KCl-NaCl molten salt system in the reaction vessel 3 , mix well and heat to melt;

[0053] (2) Pass high-purity H into the reaction vessel at a flow rate of 5000mL / min 2 , reacted at 600°C and 1 bar for 20 hours;

[0054] (3) After the reaction finishes, feed Ar into the reaction vessel to replace the high-purity H 2 , out of the box.

[0055] Cr of the corrosion inhibiting molten salt obtained in this embodiment 2+ The content is 9450ppm, Cr 3+ The Cr content is 50 ppm, and the Cr content is 500 ppm.

Embodiment 3

[0057] The matrix molten salt system used in this example is KF-ZrF 4 (KF: ZrF 4 =58:42mol%) molten salt system; the preparation process of the chromium-containing corrosion-inhibiting molten salt of the present embodiment comprises the following steps:

[0058] (1) Add 500ppm CrF to 500 grams of FLiNaK molten salt system in the reaction vessel 3 , 100ppm CrF 2 , mix well and heat to melt;

[0059] (2) Pass high-purity H into the reaction vessel at a flow rate of 10mL / min 2 , reacted at 500°C and 1.5 bar for 100 hours;

[0060] (3) After the reaction finishes, feed Ar into the reaction vessel to replace the high-purity H 2 , out of the box.

[0061] Cr of the corrosion inhibiting molten salt obtained in this embodiment 2+ The content is 350ppm, Cr 3+ The content is 230ppm, and the Cr content is 20ppm.

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Abstract

The invention discloses chromium-containing corrosion inhibition fused salt and a preparation process thereof. The corrosion inhibition fused salt is fluoride fused salt and / or chloride fused salt, a mass ratio of an element chromium accounting for the corrosion inhibition fused salt is 100-10000ppm, and the element chromium at least comprises Cr<2+> and Cr and / or Cr<3+>. The preparation process has advantages that by selection of reductant types, valence state of the element chromium in a fused salt system is regulated accurately while the problem of influences on physicochemical characteristics of products due to residues of solids and liquid reductants in the fused salt in the prior art is avoided, and accordingly product performances are guaranteed to the greatest extent, and the corrosion inhibition fused salt low in metal material corrosion is acquired. The chromium-containing corrosion inhibition fused salt and the preparation process thereof require no change of traditional equipment and have advantages of simplicity, feasibility, easiness in operation, controllability in measurement, remarkable effects and the like, production cost is far lower than that of existing similar chromium-containing corrosion inhibition fused salt, and a promising application prospect is achieved.

Description

technical field [0001] The invention relates to a chromium-containing corrosion-inhibiting molten salt and a preparation process thereof. Background technique [0002] Fluoride and chloride molten salts are a new type of high-temperature heat transfer and storage media, which have broad application prospects in the fields of high-temperature hydrogen production, nuclear reactors, solar thermal power generation, nuclear fuel reprocessing, and fuel cells; however, they are used at high temperatures It is highly corrosive to metal materials, thus limiting the promotion of its application. [0003] Those skilled in the art have found after research that by adding high-purity fluoride or chloride containing divalent chromium to molten fluoride or chloride, the corrosion of metal materials by molten fluoride or chloride can be effectively reduced; Among them, divalent chromium ions play a major role, but divalent chromium is easily oxidized and cannot exist stably in nature, so i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/12C23F11/18
CPCC09K5/12C23F11/185
Inventor 赵素芳汪洋孙华张鹏谢雷东姚思德
Owner 上海联和日环能源科技有限公司
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