Method for obtaining sponge iron by treating high-iron low-tin ore by sulfurizing volatilization direct-reduction process

A technology of high iron and low tin ore and sponge iron, applied in the field of comprehensive utilization of resources, can solve the problem of high tin content, and achieve the effects of reducing tin content, realizing recovery and reducing tin content

Active Publication Date: 2013-05-08
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0015] On the basis of the volatilization-direct reduction method, the present invention makes full use of the characteristics that tin is easy to volatilize, solves the problem of high tin content in high-iron and low-tin ores, and realizes the comprehensive recycling of tin, while performing the direct reduction method, Obtain high-grade sponge iron and improve the comprehensive utilization rate of iron resources

Method used

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  • Method for obtaining sponge iron by treating high-iron low-tin ore by sulfurizing volatilization direct-reduction process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Dry and grind high iron and low tin raw ore, vulcanizing agent and reducing agent to 200 mesh respectively, add to the raw ore according to the mass ratio of vulcanizing agent: raw ore is 1:50, reducing agent: raw ore is 1:10 FeS 2 , FeS and S, and pulverized coal, and mix them evenly;

[0037] (2) Place the obtained product in step (1) at 1150°C, and at the same time, pass in nitrogen gas with a flow rate of 0.4L / min, keep it warm for 40 minutes for vulcanization and volatilization treatment; then change it to oxygen with a flow rate of 0.4L / min, Heat preservation for 60 minutes to carry out coal-based direct reduction;

[0038] (3) The high-temperature flue gas formed during the reaction in step (2) is routinely cooled and dust-collected to recover the tin resources, and the flue gas is then routinely dust-removed and washed to remove harmful gases, and discharged into the atmosphere after meeting the emptying requirements. Sponge iron is obtained after the mate...

Embodiment 2

[0040] (1) Dry the high-iron and low-tin raw ore, vulcanizing agent and reducing agent separately, and grind them to 250 meshes, and add them to the raw ore according to the mass ratio of vulcanizing agent: raw ore is 1:30, reducing agent: raw ore is 1:5 Gypsum and reducing agent oil and coke powder, and mix well;

[0041] (2) Place the obtained product in step (1) at 1300°C, and at the same time pass in argon gas with a flow rate of 0.2L / min, keep it warm for 80min for vulcanization and volatilization treatment; Air, heat preservation for 80min for coal-based direct reduction;

[0042] (3) The high-temperature flue gas formed during the reaction in step (2) is routinely cooled and dust-collected to recover the tin resources, and the flue gas is then routinely dust-removed and washed to remove harmful gases, and discharged into the atmosphere after meeting the emptying requirements. Sponge iron is obtained after the material is cooled. Sampling and analysis showed that the t...

Embodiment 3

[0044](1) Dry the high-iron and low-tin raw ore, vulcanizing agent and reducing agent separately, and grind them to 150 mesh, and add them to the raw ore according to the mass ratio of vulcanizing agent: raw ore is 1:5, reducing agent: raw ore is 1:50 Vulcanizing agent FeS, gypsum and reducing agent coke powder, and mix evenly;

[0045] (2) Place the obtained product in step (1) at 1000°C, and at the same time, pass nitrogen gas with a flow rate of 1L / min, and keep it warm for 20 minutes for vulcanization and volatilization treatment; then change it to air with a flow rate of 0.2L / min, keep it warm 20min for coal-based direct reduction;

[0046] (3) The high-temperature flue gas formed during the reaction in step (2) is routinely cooled and dust-collected to recover the tin resources, and the flue gas is then routinely dust-removed and washed to remove harmful gases, and discharged into the atmosphere after meeting the emptying requirements. Sponge iron is obtained after the ...

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Abstract

The invention provides a method for obtaining sponge iron by treating high-iron low-tin ore by a sulfurizing volatilization direct-reduction process. The method comprises the steps of: respectively drying and grinding the high-iron low-tin raw ore, a sulfurizing agent and a reducing agent; adding the sulfurizing agent and the reducing agent in the raw ore and evenly mixing; putting the mixture obtained from the former step at the temperature of 1000-1300 DEG C simultaneously introducing inert gas with a flow rate of 0.2-1L/min, and preserving the temperature for 20-80minutes for carrying out sulfurizing volatilization treatment; and then introducing oxide gas with a flow rate of 0.2-1L/min and preserving the temperature for 20-80minutes for direct reduction; conventionally cooling high temperature flue gas generated in reaction, carrying out dust collection treatment for recovering tin resources in the high temperature flue gas, and cooling the remaining materials, thus obtaining the sponge iron. The high-iron low-tin ore is treated by utilizing the easy sulfurizing-volatilization property of tin, the content of tin can be reduced, tin is recovered and the comprehensive recovery rate of the tin resource is improved. Simultaneously, a coal-based direct reaction is carried out for producing the high-grade sponge iron, the technical flow is shortened and the comprehensive utilization rate of an iron resource is improved.

Description

technical field [0001] The invention provides a method for obtaining sponge iron by treating high-iron and low-tin ore with a volatilization and direct reduction method, and belongs to the technical field of comprehensive utilization of resources. Background technique [0002] Wang Zhong of the Beijing General Research Institute of Mining and Metallurgy conducted research on the recovery of tin resources in tin ore by using the rotary kiln vulcanization and volatilization method. , the volatilization rate of tin is 98%, the residual tin of baked balls is 0.14%, the effect of vulcanization and volatilization is better, and adding lime at a ratio of 15% to the roasted pellets can increase the strength of the pellets and reduce the pulverization of the pellets after kiln , At the same time, the roasting temperature can be increased, which is conducive to the smooth volatilization of tin. Wei Guoguo, Laibin Smelter of Liuzhou Huaxi Group, studied the vulcanization and volatiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00
Inventor 王华李磊胡建杭魏永刚廖冰邱在军
Owner KUNMING UNIV OF SCI & TECH
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