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Method for preparing vanadium-nitrogen alloy through stone coal vanadium extraction vanadium-rich liquid

A technology of vanadium-nitrogen alloy and vanadium liquid, which is applied in the field of vanadium-nitrogen alloy to achieve the effects of reducing production costs, short reaction time, and saving raw materials

Active Publication Date: 2017-04-26
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, there are no relevant reports on the production of vanadium-nitrogen alloys using vanadium-enriched liquid for extracting vanadium from stone coal as raw material

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The invention discloses a method for preparing a vanadium-nitrogen alloy by using a vanadium-rich solution for extracting vanadium from stone coal. The concrete steps of the method described in this embodiment are:

[0033] Step 1. Precursor preparation

[0034] The carbonaceous reducing agent is added into the vanadium-rich liquid, stirred at 60-80°C for 3-4h, and dried at 250-350°C for 30-90min to obtain a precursor.

[0035] The molar weight of the carbonaceous reducing agent is 1.5-2.5 times of the total molar weight of cations in the vanadium-rich liquid.

[0036] Step two, briquetting

[0037] Pressing the precursor to a density of 1.5-1.8g / cm 3 block, to obtain a block precursor.

[0038] Step 3. Reductive nitriding

[0039] Under the conditions of normal pressure and nitrogen flow rate of 100-400mL / min, the bulk precursor is heated to 1000-1200°C and kept for 3-5h; cooled to room temperature-100°C with the furnace, taken out of the furnace, crushed and grou...

Embodiment 2

[0050] The invention discloses a method for preparing a vanadium-nitrogen alloy by using a vanadium-rich solution for extracting vanadium from stone coal. The present embodiment except carbonaceous reducing agent, all the other are the same as embodiment 1.

[0051] The carbonaceous reducing agent is a mixture of graphite and activated carbon.

[0052] The vanadium-nitrogen alloy prepared in this example is measured: the vanadium content is 78.56~80.47wt%; the nitrogen content is 12.67~13.97wt%; the apparent density is 3.12~3.52g / cm 3 .

Embodiment 3

[0054] The invention discloses a method for preparing a vanadium-nitrogen alloy by using a vanadium-rich solution for extracting vanadium from stone coal. The concrete steps of the method described in this embodiment are:

[0055] Step 1. Precursor preparation

[0056] The carbonaceous reducing agent is added into the vanadium-rich liquid, stirred at 70-90°C for 2.5-3.5h, and dried at 250-350°C for 30-90min to obtain the precursor.

[0057] The molar weight of the carbonaceous reducing agent is 2.0-3.5 times of the total molar weight of cations in the vanadium-rich liquid.

[0058] Step two, briquetting

[0059] Pressing the precursor to a density of 1.6-1.9g / cm 3 block, to obtain a block precursor.

[0060] Step 3. Reductive nitriding

[0061] Under the conditions of normal pressure and nitrogen flow rate of 200-500mL / min, the bulk precursor is heated to 1100-1300°C and kept for 2-4h; cooled to room temperature-100°C with the furnace, taken out of the furnace, crushed an...

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Abstract

The invention relates to a method for preparing vanadium-nitrogen alloy through stone coal vanadium extraction vanadium-rich liquid. According to the technical scheme, a carbonaceous reducing agent is added into the vanadium-rich liquid, stirring and drying are conducted, and a precursor is obtained; the vanadium-rich liquid is an intermediate product of stone coal vanadium extraction; the molar weight of the carbonaceous reducing agent is 1.5-4 times the total molar weight of positive ions in the vanadium-rich liquid, the precursor is mechanically pressed into a block shape, at the ordinary pressure and a nitrogen atmosphere, the blocky precursor is subjected to heat preservation for 1-5 h under the condition of 1000-1400 DEG C, then cooled with a furnace and levigated, and a second intermediate product is obtained; a hydrochloric acid solution is added into the second intermediate product, stirring and solid-liquid separation are conducted, and solid slag is obtained; the molar weight of HCl in the hydrochloric acid solution is 3-5 times the total molar weight of positive ions except vanadium positive ions in the vanadium-rich liquid; and the solid slag is dried and briquetted, and the vanadium-nitrogen alloy is obtained. The method has the characteristics that the stone coal vanadium extraction vanadium-rich liquid is used as a vanadium source, the production cost is low, the raw material consumption is low, and the reaction time is short.

Description

technical field [0001] The invention belongs to the technical field of vanadium nitrogen alloys. Specifically, it relates to a method for preparing a vanadium-nitrogen alloy by using a vanadium-rich solution for extracting vanadium from stone coal. Background technique [0002] Vanadium-nitrogen alloy is a new type of alloy additive. It is alloyed with vanadium-nitrogen without adding other precious alloy elements. Under normal hot rolling conditions, high-strength steel with a yield strength of 550~600MPa can be obtained. Therefore, vanadium-nitrogen alloys have been widely used in the R&D and production of high-strength steel bars, non-quenched and tempered steels, tool steels and other products. [0003] The raw materials for the production of vanadium-nitrogen alloys are various vanadium-containing materials, including vanadium metal, vanadium pentoxide, vanadium tetroxide, vanadium trioxide, ammonium metavanadate, ammonium polyvanadate, and vanadium chloride. There ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C35/00C22C29/16C22C1/00
CPCC22C1/00C22C29/16C22C35/00
Inventor 张一敏韩静利刘涛黄晶陈铁军
Owner WUHAN UNIV OF SCI & TECH
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