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A method for preparing iron concentrate for ironmaking from tin-containing iron ore

A technology of iron concentrate and iron ore, which is applied in the field of comprehensive utilization of tin-containing iron ore, can solve the problems of equipment requirements for polluting the environment, long roasting time, and high vulcanization temperature, and achieve the effects of safe operation, low cost, and low roasting temperature

Active Publication Date: 2016-05-25
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantages of this method are: the vulcanization temperature is high, requiring a high temperature of 1180 ° C to 1300 ° C; the roasting time is long, requiring 60 ~ 90 min; and the flue gas contains SO 2 The gas needs to be desulfurized before it can be discharged, otherwise it will cause secondary pollution
However, the prominent problems of volatilization and chlorination roasting methods are high energy consumption, environmental pollution and high equipment requirements.

Method used

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  • A method for preparing iron concentrate for ironmaking from tin-containing iron ore

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Experimental program
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Effect test

Embodiment 1

[0054] The finely ground tin-containing iron ore and sodium carbonate are mixed according to the mass ratio of 1:0.1; after mixing, agglomerates are formed, dried, and then the dry agglomerates are placed in a mixture of CO and CO 2 Heating and roasting in a reducing atmosphere composed of a mixed gas, where [CO / (CO+CO 2 )] × 100% = 17%, the roasting temperature is 850 ° C, and the time is 60 min; after the roasting agglomerate is cooled, it is ground and soaked, and magnetic separation is carried out with a magnetic field strength of 1000Gs, and the TFe content in the obtained magnetic-separated iron concentrate is 62.1% , the tin content is 0.08%, and the recovery rate of iron is 83.2%. Through analysis and calculation, 80.6% of the tin in the raw ore enters the sodium stannate solution filtered by the non-magnetic material.

Embodiment 2

[0056] The finely ground tin-containing iron ore and sodium carbonate are mixed according to the mass ratio of 1:0.4; after mixing, the agglomerates are formed, dried, and then the dry agglomerates are placed in a mixture of CO and CO 2 Heating and roasting in a reducing atmosphere composed of a mixed gas, where [CO / (CO+CO 2 )] × 100%=5%, the roasting temperature is 945°C, and the time is 30min; after the roasting agglomerate is cooled, it is ground and soaked, and magnetic separation is carried out with a magnetic field strength of 1000Gs, and the TFe content is 62.8% in the obtained magnetic-separated iron concentrate, The tin content was 0.07%, and the recovery rate of iron was 84.4%. Through analysis and calculation, 81.5% of the tin in the raw ore enters the sodium stannate solution filtered by the non-magnetic material.

Embodiment 3

[0058] The finely ground tin-containing iron ore and sodium carbonate are mixed according to the mass ratio of 1:0.3; after mixing, the agglomerates are formed, dried, and then the dry agglomerates are placed in a mixture of CO and CO 2 Heating and roasting in a reducing atmosphere composed of a mixed gas, where [CO / (CO+CO 2 )] × 100%=15%, the roasting temperature is 875°C, and the time is 55min; after the roasting agglomerate is cooled, it is ground and soaked, and magnetic separation is carried out with a magnetic field strength of 1000Gs, and the TFe content is 63.5% in the gained magnetic-separated iron concentrate, The tin content is 0.05%, and the recovery rate of iron is 86.1%. Through analysis and calculation, 85.6% of the tin in the raw ore enters the sodium stannate solution filtered by the non-magnetic material.

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Abstract

The invention discloses a method for preparing iron ore concentrate for ironmaking from tin-containing iron ore. The method comprises the following steps: mixing the tin-containing iron ore and a sodium carbonate additive according to a certain ratio, agglomerating, drying, and performing reducing roasting under proper temperature and reducing roasting atmosphere; and separating magnetite concentrate by combining an ore grinding-magnetic separating method, and filtering and separating sodium stannate solution and filter residues from remaining nonmagnetic matters. The method is simple in process flow, mild in process conditions, low in cost and environmental friendly, particularly effective separation between tin and iron in the tin-containing iron ore is realized, the iron recovery rate is high, the content of tin in the obtained iron ore concentrate is low, and the iron ore concentrate can serve as a raw material during blast furnace ironmaking.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of tin-containing iron ore, in particular to a method for preparing iron concentrate for ironmaking from tin-containing iron ore, belonging to the fields of mineral processing and iron and steel metallurgy. Background technique [0002] my country is rich in iron ore resources. With the depletion of high-grade iron ore resources and the rising price of imported iron ore, it is necessary to increase the development and utilization of complex and refractory iron ore resources. Tin-bearing iron ore is a typical complex iron ore with abundant reserves. It is mainly distributed in Inner Mongolia, Guangxi, Hunan, Yunnan and other provinces. It generally contains 30% to 55% iron and 0.13% to 0.5% tin. Excessive tin content will seriously affect the smooth operation and operation system of the blast furnace. Therefore, for the large-scale application of this resource, tin (Sn content below 0.08%)...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B25/00
Inventor 张元波姜涛李光辉刘兵兵陈军苏子键范晓慧黄柱成郭宇峰杨永斌李骞陈许玲彭志伟徐斌甘敏游志雄周友连杜明辉
Owner CENT SOUTH UNIV
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