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Method for removing phosphorus in high-phosphorus iron ore by virtue of acid leaching and recycling acid liquor

A high-phosphorus iron ore and acid leaching technology, applied in the direction of improving process efficiency, can solve the problems of harsh production environment, difficult and efficient dephosphorization, acid pollution, etc., to avoid large consumption and environmental pollution, save water resources, The effect of reducing acid consumption

Inactive Publication Date: 2014-06-25
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphorus is embedded in the core or interlayer of the oolitic structure in the state of apatite, and because the interlayer distance is at the micron level, it is difficult to dephosphorize efficiently by conventional physical crushing-roasting-magnetic separation
Due to the long culture period and harsh production environment, bioleaching cannot be applied on a large scale in actual production.
Wet acid leaching has many advantages such as simple operation, large batch capacity, and high dephosphorization efficiency, but it consumes a lot of acid, has high iron loss, and acid pollution has become a major problem in its application.

Method used

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  • Method for removing phosphorus in high-phosphorus iron ore by virtue of acid leaching and recycling acid liquor
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  • Method for removing phosphorus in high-phosphorus iron ore by virtue of acid leaching and recycling acid liquor

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Experimental program
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Effect test

Embodiment 1

[0024] The oolitic high-phosphorite iron ore with an iron grade of 50% and a phosphorus content of 0.7% is crushed and finely ground, and the ore powder with a particle size of 150-200 mesh is screened out, and the hydrochloric acid solution with a volume fraction of 0.75% is mixed evenly in a reaction vessel, and the The leaching dephosphorization operation, wherein the liquid-solid ratio is 1000 ml:100 g, the stirring speed is 400 rpm, the reaction temperature is 25°C, and the reaction time is 1 h. Subsequently, solid-liquid separation was carried out, and the phosphorus content of the obtained filter residue was 0.082%, the iron content was 55%, and the pH of the filtrate was 1.45. When the acid solution was supplemented with part of concentrated hydrochloric acid until the pH was about 1, the new ore was leached, and the other operating conditions were the same as above, and the cycle was repeated 5 times. The phosphorus content of the obtained filter residue was shown in T...

Embodiment 2

[0029] The oolitic high-phosphorite iron ore with an iron grade of 50% and a phosphorus content of 0.7% is crushed and finely ground, and the ore powder with a particle size of 150-200 mesh is sieved, mixed with a hydrochloric acid solution with a volume fraction of 2% in a reaction vessel, and carried out The leaching dephosphorization operation, wherein the liquid-solid ratio is 1000 ml:300 g, the stirring speed is 400 rpm, the reaction temperature is 25°C, and the reaction time is 1 h. Due to the small liquid-solid ratio, when the pH is greater than 1.5 during the reaction, some concentrated hydrochloric acid is added to keep the pH value below 1.5. After the reaction, the solid-liquid separation is carried out. The phosphorus content in the filter residue is 0.091%, and the iron content is 0.091%. It was 56%, and the pH of the filtrate was 1.1. Add part of concentrated hydrochloric acid to the waste acid solution until the pH is about 0.7, and then leaching the new ore. Th...

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Abstract

The invention relates to a method for removing phosphorus in a high-phosphorus iron ore by virtue of acid leaching and recycling an acid liquor and belongs to the field of wet metallurgy. The method is characterized by comprising the following steps: fine grinding and sieving the high-phosphorus iron ore, mixing the fine ground high-phosphorus iron ore with an acid liquor having a certain concentration and carrying out a leaching reaction by an appropriate constant stirring speed; after the reaction is finished, performing solid-liquid separation operation on an acid-ore suspension; after the content of phosphorus in the filter residue is detected to be qualified, directly starting a steel production process, replenishing partial concentrated acid to the filtrate to recover the initial acidity and then recycling the filtrate to leach new materials; when the recycling of the filtrate reaches the limit and the dephosphorization rate is no longer capable of meeting the production requirement, performing purification treatment on the filtrate, and directly draining the purified solution or recycling the purified solution in the acid leaching dephosphorization process. The method is simple to operate, high in dephosphorization efficiency, and capable of obtaining the iron ore with satisfying quality; besides, the method is also capable of recycling the waste acid liquor, reducing the purification times of the acid liquor, and thus saving the cost and protecting the environment.

Description

technical field [0001] The invention relates to a method for removing phosphorus in high-phosphorus iron ore by acid leaching and recycling acid solution. Background technique [0002] With the development of economy and society, my country's demand for iron and steel products is increasingly strong, but as the "grain" of the iron and steel industry, the reserve of iron ore resources is extremely unreasonable. Although my country's iron ore reserves are rich, but the grade is low, lean ore is more than rich ore, and multi-component associated ore occupies a large proportion. At present, the proven iron ore reserves in the country are about 68 billion tons, but the economical reserves are only 16.6 billion tons, and the high-phosphorus iron ore that is difficult to smelt reaches 10 billion tons, of which 4 billion tons are of high iron grade. However, the phosphorus content is also high and cannot be directly put into the furnace. High-phosphorus iron ore reserves are abund...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/06
CPCY02P10/20
Inventor 郭占成余锦涛
Owner UNIV OF SCI & TECH BEIJING
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