Method for preparing iron ore concentrate and sulfur through co-treatment of iron-containing tailings and pyrite

A technology of synergistic processing and pyrite, applied in chemical instruments and methods, improvement of process efficiency, solid separation, etc., can solve problems such as occupying large land and excess sulfuric acid production capacity, and achieve low cost, good environmental protection benefits, and resource utilization The effect of high utilization

Pending Publication Date: 2021-03-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to extract target metals in the process of non-ferrous metal smelting, pyrite is often stored as a by-product in the process of dressing and smelting or sent to acid production enterprises. The storage not only takes up a lot of land, but also has a negative impact on the environment due to its characteristics. The surrounding environment has a certain impact; in addition, the current production capacity of sulfuric acid in my country is excessive, and it is not a good choice to use pyrite for acid production

Method used

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  • Method for preparing iron ore concentrate and sulfur through co-treatment of iron-containing tailings and pyrite
  • Method for preparing iron ore concentrate and sulfur through co-treatment of iron-containing tailings and pyrite
  • Method for preparing iron ore concentrate and sulfur through co-treatment of iron-containing tailings and pyrite

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Effect test

Embodiment 1

[0038] A method for preparing iron concentrate and sulfur by co-processing iron-containing tailings and pyrite according to the present invention comprises the following steps:

[0039] (1) 1000g iron-containing tailings #1 and 135g pyrite (molar ratio Fe 2 O 3 :FeS 2 =1:0.25) grind and mix uniformly to obtain a mixture;

[0040] (2) the mixture obtained in step (1) is put into the tube furnace, and nitrogen is slowly introduced into the furnace (the amount of nitrogen introduced is 3 times the furnace volume), to purge the air in the furnace; open the heating and Continue to feed nitrogen at a rate of 100mL / min, raise the temperature to 800°C, keep roasting for 1.5h, discharge and cool the gas generated during the roasting, so that the sulphur in the gas is precipitated to obtain 58g of sulphur, as shown in the photo. Image 6 As shown, the cooled gas is pumped to the inert gas vent and continues into the furnace for recycling;

[0041] (3) After the roasting is completed...

Embodiment 2

[0048] A method for preparing iron concentrate and sulfur by co-processing iron-containing tailings and pyrite according to the present invention comprises the following steps:

[0049] (1) 1000g iron-containing tailings #1 and 135g pyrite (molar ratio Fe 2 O 3 :FeS 2 =1:0.25)) grinding and mixing to obtain a mixture;

[0050] (2) put the mixed material in the step (1) into the tube furnace, slowly feed the nitrogen of 3 times of the furnace chamber volume, to purge the air in the furnace, open the roasting furnace heating device and continue at the rate of 100mL / min Nitrogen was introduced, the temperature was raised to 1000°C, and the temperature was kept for 1.5 hours. During the roasting process, the flue gas was discharged and cooled to precipitate the sulfur in the gas to obtain 64g of sulfur. The cooling gas was pumped to the inert gas vent and passed into the furnace. in order to achieve recycling;

[0051] (3) After the roasting is completed, the temperature of th...

Embodiment 3

[0054] A method for preparing iron concentrate and sulfur by co-processing iron-containing tailings and pyrite, comprising the following steps:

[0055] (1) mix 1000g iron-containing tailings #1 with 230g pyrite (molar ratio Fe 2 O 3 :FeS 2 =1:0.5) grinding and mixing to obtain a mixture;

[0056] (2) put the mixture in the step (1) into the tube furnace, slowly feed the nitrogen of 1 times the furnace chamber volume to purge the air in the furnace, turn on the heating device, and continue to feed at a rate of 40mL / min Nitrogen, and the temperature was raised to 700 ° C, and roasting for 1.5 hours. During the roasting process, the gas was discharged and cooled to precipitate sulfur in the gas to obtain 87 g of sulfur. The cooling gas was pumped to the inert gas vent hole and passed into the furnace to realize recycling. ;

[0057] (3) After the roasting is completed, the temperature of the tube furnace is lowered to 50°C, and the nitrogen flow is stopped, the roasting slag...

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Abstract

The invention discloses a method for preparing iron ore concentrate and sulfur through co-treatment of iron-containing tailings and pyrite. The method comprises the following steps that the iron-containing tailings and the pyrite are mixed; the mixture is subjected to high-temperature roasting treatment under the protection of inert gas, gas generated by high-temperature roasting is cooled, and asolid product obtained through cooling is sulfur; and roasting slag obtained through roasting is subjected to magnetic separation, and the iron ore concentrate and magnetic separation tailings are obtained. According to the method, the iron-containing tailings and the pyrite are co-treated, the iron-containing tailings can promote sulfur in the pyrite to be converted into brimstone, and meanwhile,iron contained in the iron-containing tailings and the pyrite can be converted into ferroferric oxide which is easy to separate out by magnetic separation, and the problems of stockpiling of iron-containing tailings generated by smelting enterprises and pyrite generated by ore dressing enterprises and pollution to the surrounding environment are solved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of tailing resources, in particular to a method for preparing iron concentrate and sulfur by co-processing iron-containing tailings and pyrite. Background technique [0002] my country has produced a large amount of iron-containing tailings in the acid production, smelting and other industries. At present, most of the iron-containing tailings produced are in the state of stockpiling and cannot be used as resources, which not only occupies a large amount of land, but also pollutes the surface and The groundwater system poses a serious threat to the ecological environment and the health of residents. [0003] Pyrite is the most widespread sulfide mineral in the earth's crust, and is often associated with non-ferrous metal sulfide minerals. In order to extract the target metal in the non-ferrous metal smelting process, pyrite is often stored as a by-product in the process of dressing and smel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/04B03C1/005B03C1/02
CPCB03C1/005B03C1/02C22B1/02C22B7/001C22B7/04Y02P10/20
Inventor 郭学益秦红于大伟田庆华刘鹏飞张磊
Owner CENT SOUTH UNIV
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