Method for removing phosphorus and leaching iron from high-phosphorus oolitic hematite through cross flow

A technology for high-phosphorus oolites and hematites, which is applied in the field of cross-flow leaching of high-phosphorus oolitic hematites for iron-rich dephosphorization, can solve the problems of difficulty in effectively improving ore grades, large environmental pollution, and high acidity of wastewater, and can reduce iron The effect of high content, large processing capacity and pollution reduction

Inactive Publication Date: 2014-03-26
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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AI Technical Summary

Problems solved by technology

Lu Shangwen et al. conducted a lot of research on one-time acid leaching dephosphorization. Although the leaching rate of phosphorus in this process can reach more than 90%, it consumes a lot of acid. Big pollution
Shen Shaobo proposed a two-step acid leaching method to remove phosphorus in high-phosphorus iron ore, but this method inevitably leads to a large loss of iron, and it is difficult to effectively improve the grade of the ore

Method used

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  • Method for removing phosphorus and leaching iron from high-phosphorus oolitic hematite through cross flow

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1. use tap water and concentrated hydrochloric acid preparation concentration to be the hydrochloric acid solution of 2.5mol / L as leaching agent, at liquid-solid ratio 3: 1, normal temperature, under the condition of rotating speed 300r / min, add particle size below 0.147mm, total iron content is 49%, 50 g of high-phosphorus oolitic hematite powder with a phosphorus content of 1.125%, stirred for 45 minutes, filtered after stopping the stirring, and obtained ironmaking raw material 1 and filtrate 1, the total iron content of raw material 1 was 58.3% and the phosphorus content was 0.086%; Using filtrate 1 as leaching agent, add the same amount of high-phosphorus oolitic hematite powder under the same conditions as above, stir for 45 minutes, stop stirring and filter to obtain ironmaking raw material 1' and filtrate 1', the total iron content of raw material 1' 59.1% and phosphorus content 0.127%; use filtrate 1' as the leaching agent to repeat the operation of f...

Embodiment 2

[0023] Embodiment 2. use tap water and concentrated hydrochloric acid preparation concentration to be the hydrochloric acid solution of 2.5mol / L as leaching agent, at liquid-solid ratio 3: 1, normal temperature, under the condition of rotating speed 250r / min, add particle size below 0.147mm, total iron content is 52.4%, 50 g of high-phosphorus oolitic hematite powder with a phosphorus content of 0.82%, stirred for 45 minutes, filtered after stopping the stirring, and obtained ironmaking raw material 2 and filtrate 2, the total iron content of raw material 2 was 60.8% and the phosphorus content was 0.086%; Using the filtrate 2 as the leaching agent, add the same amount of high-phosphorus oolitic hematite powder under the same conditions as above, stir for 45 minutes, stop stirring and filter, and then obtain the ironmaking raw material 2' and filtrate 2', the total iron content of the raw material 2' 61.5% and phosphorus content 0.127%; repeat the operation of filtrate 2 with fi...

Embodiment 3

[0024] Embodiment 3. use tap water and concentrated hydrochloric acid preparation concentration to be the hydrochloric acid solution of 2.0mol / L as leaching agent, at liquid-solid ratio 3: 1, normal temperature, under the condition of rotating speed 250r / min, add particle size and be less than 0.147mm, total iron content is 46%, 50 g of high-phosphorus oolitic hematite powder with a phosphorus content of 0.82%, stirred for 45 minutes, filtered after stopping the stirring, and obtained ironmaking raw material 3 and filtrate 3, the total iron content of raw material 3 was 51.5% and the phosphorus content was 0.090%; Using the filtrate 3 as the leaching agent, add the same amount of high-phosphorus oolitic hematite powder under the same conditions as above, stir for 45 minutes, stop stirring and then filter to obtain the ironmaking raw material 3' and filtrate 3'. The ironmaking raw material 3' has a total iron content of 53.2%, a phosphorus content of 0.133%, and two leaching sta...

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Abstract

The invention provides a method for removing phosphorus and leaching iron from high-phosphorus oolitic hematite through cross flow. The method comprises the following steps: the high-phosphorus oolitic hematite is grinded to be less than 0.147 mm; the grinded high-phosphorus oolitic hematite reacts with a hydrochloric acid leaching agent with a certain concentration; a certain amount of the leaching agent is taken out and added with the high-phosphorus oolitic hematite with a certain mass for reaction; the solid obtained through separation after reaction is used as an ironmaking raw material; the filtrate is continuously used for treating the high-phosphorus oolitic hematite, the mass of which is equal to that of the filtrate; the above steps are repeatedly until phosphorus content in the solid obtained through separation is higher than 0.2%, so that the iron is leached out and the phosphorus is removed through multi-stage cross-flow. According to the method, a multi-stage cross-flow method is adopted, the filtrate obtained after leaching for each time is in contact with new high-phosphorus oolitic hematite, so that acid in the filtrate is used fully, the whole process forms a closed cycle, multiple high-phosphorus iron ores are treated, the water consumption is less, compared with a one-step acid leaching method and a two-step acid leaching method, the method can efficiently remove phosphorus from the high-phosphorus oolitic hematite, the phosphorus removal rate can reach 90-99%, the iron content in the filtrate is reduced, the loss of iron is reduced greatly, and the grade of total iron is improved by 6-12%.

Description

technical field [0001] The invention belongs to the field of mineral processing, in particular to a method for cross-flow leaching iron-rich dephosphorization of high-phosphorus oolitic hematite. Background technique [0002] China is rich in high-phosphorus iron ore resources, accounting for 14.86% of the total reserves, reaching 7.45 billion tons. Since the discovery of this type of iron ore in the 1960s, due to its high phosphorus content, there has been no feasible beneficiation method for effective dephosphorization , making it a "waste mine". Phosphorus is one of the main harmful elements in the process of iron and steel smelting. It makes the steel easy to break during cold working, showing "cold brittleness". very low. The effective development and utilization of these iron ore resources with high phosphorus content can not only alleviate the shortage of iron ore concentrate in my country's iron and steel industry, but also realize the comprehensive utilization of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/10
CPCY02P10/20
Inventor 安娟夏文堂尹建国杨文强袁晓丽周雪娇
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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