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A method for detecting high-temperature melting ability of chrome ore and sample components

A technology of melting ability and chromium ore, which is applied in the field of metallurgy, can solve the problems of high melting point of chromium ore, difficulty in obtaining high-temperature melting performance, etc., achieve high stability, sufficient heat transfer, and reduce the difficulty of detection

Active Publication Date: 2020-09-15
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem that chrome ore has a high melting point and it is difficult to obtain high-temperature melting performance, the invention provides a method for detecting the high-temperature melting ability of chrome ore and sample components. The invention has the advantages of simple process flow, strong operability, and the detection results can be analyzed Melting capabilities of different chrome ores

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  • A method for detecting high-temperature melting ability of chrome ore and sample components
  • A method for detecting high-temperature melting ability of chrome ore and sample components
  • A method for detecting high-temperature melting ability of chrome ore and sample components

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Embodiment 1

[0041] Select the chrome ore ore kind as South African chrome ore, Turkey chrome ore, Tibet chrome ore, and the method for detecting the high-temperature melting ability of the chrome ore includes the following steps:

[0042] 1) Finely grind the chromium ore in a ball mill to below 0.074mm, put it in a vacuum drying oven, and dry it at 120°C for 3 hours for later use;

[0043] 2) Take a certain amount of chromium ore powder and press it into a columnar sample with a diameter of 5 mm and a height of 5.5 mm under a pressure of 5 MPa. figure 1 The sample assembly shown is placed in a high temperature furnace;

[0044] 3) Introduce N into the high temperature furnace 2 Mixed gas with CO, in the mixed gas, the content of CO is 85%, and the rest is N 2, the control gas flow rate is 5L / min; the initial heating rate in the high temperature furnace is 20°C / min; the temperature is monitored in real time, when the temperature is 850°C, the heating rate is adjusted to 10°C / min; when th...

Embodiment 2

[0047] Select the chrome ore ore kind as South African chrome ore, Turkey chrome ore, Tibet chrome ore, and the method for detecting the high-temperature melting ability of the chrome ore includes the following steps:

[0048] 1) Finely grind the chromium ore in a ball mill to below 0.074mm, put it in a vacuum drying oven, and dry it at 105°C for 6 hours for later use.

[0049] 2) Take a certain amount of chromium ore powder and press it into a columnar sample with a diameter of 3 mm and a height of 5 mm under a pressure of 4 MPa. figure 1 The sample assembly shown is placed in a high temperature furnace;

[0050] 3) Introduce N into the high temperature furnace 2 Mixed gas with CO, in the mixed gas, the content of CO is 80%, and the rest is N 2 , the control gas flow rate is 5L / min; the initial heating rate in the high temperature furnace is 20°C / min; the temperature is monitored in real time, when the temperature is 850°C, the heating rate is adjusted to 10°C / min; when the...

Embodiment 3

[0053] Select the chrome ore ore kind as South African chrome ore, Turkey chrome ore, Tibet chrome ore, and the method for detecting the high-temperature melting ability of the chrome ore includes the following steps:

[0054] 1) Finely grind the chromium ore in a ball mill to below 0.074mm, put it in a vacuum drying oven, and dry it at 110°C for 4 hours for later use;

[0055] 2) Take a certain amount of chromium ore powder and press it into a columnar sample with a diameter of 6 mm and a height of 8 mm under a pressure of 6 MPa. figure 1 The sample assembly shown is placed in a high temperature furnace;

[0056] 3) Introduce N into the high temperature furnace 2 Mixed gas with CO, in the mixed gas, the content of CO is 90%, and the rest is N 2 , the control gas flow rate is 5L / min; the initial heating rate in the high temperature furnace is 20°C / min; the temperature is monitored in real time, when the temperature is 850°C, the heating rate is adjusted to 10°C / min; when the...

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Abstract

The invention mainly relates to a method for detecting a high-temperature melting capability of chromium ore and a test sample assembly, and belongs to the technical field of metallurgy. The method comprises the following detection steps: (1) finely grinding the chromium ore until the size is 0.074mm or below; then carrying out cold pressing molding on the chromium ore to form a cylindrical test sample with a certain diameter and height; 2) putting the cylindrical test sample into a high-temperature furnace according to a structure of a corundum gasket+a quartz gasket+a test sample; 3) introducing constant flow of reducing gas into the high-temperature furnace and heating and roasting according to a pre-set heating speed; continuously photographing in a heating process and recording real-time temperature; when the softening percentage (the specific value of test sample height to original test sample height under temperature T) of the chromium ore is 90 percent, determining that the temperature is temperature at which the chromium ore starts to melt. The method provided by the invention is simple in technological process and high in operability; a detection result can be used for analyzing the melting capability of the different chromium ores.

Description

【Technical field】 [0001] The invention belongs to the technical field of metallurgy, and mainly relates to a method for detecting the high-temperature melting ability of chromium ore and a sample assembly. 【Background technique】 [0002] Chromium ore is the main raw material in the smelting of ferrochrome alloy. After lump ore or fine ore is used to make agglomerates, it is further smelted in the submerged arc furnace production process. Submerged arc furnace smelting can be divided into two main periods: "melting period" and "refining period". It is a technical and economic index, so it is of great significance to clarify the melting capacity of chromium ore from different sources. However, my country is a country that is relatively scarce in chromium ore resources, and domestic chromium ore still has defects such as low grade and low usable value, so it has to rely on imported chromium ore to meet the needs of the rapid development of the iron and steel industry. Differe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/04G01N1/28
CPCG01N1/28G01N25/04
Inventor 邢相栋陈云飞
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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