Acid leaching technology for eroding silicon, preserving iron and removing phosphorus in high phosphorus oolitic hematite

Abstract

The invention discloses an acid leaching technology for eroding silicon, preserving iron and removing phosphorus in high phosphorus oolitic hematite. The technology comprises the steps as follows: 1, the high phosphorus oolitic hematite is subjected to mineral separation with a conventional mineral separation process so that ore pulp of rough iron concentrate is obtained, and a mass percentage concentration of the rough iron concentrate in the ore pulp is adjusted to 50-70%; 2, the ore pulp with adjusted concentration is added to an agitator, technical hydrochloric acid, an iron preserving agent and a silicon eroding agent are added to the agitator, and agitation leaching is performed for 15-45 min; and 3, filtration is performed, so that a filter liquid and a filter cake are obtained, and the filter cake is low-phosphorus iron concentrate. According to the acid leaching technology, the technology route is simple, the production cost is low, the operation is simple, the energy consumption is low, and the ore adaptability is high; and with the adoption of the acid leaching technology, the iron grade of the rough iron concentrate can be improved, the iron recovery rate in a leaching process can reach 90-95%, and the low-phosphorus iron concentrate with an iron grade no less than 60% and a P2O5 content not higher than 0.15% can be finally obtained.

Description

technical field [0001] The invention belongs to the technical field of iron ore dephosphorization, and in particular relates to an acid leaching process for dephosphorizing high-phosphorus oolitic hematite by corroding silicon and preserving iron. Background technique [0002] my country's high-phosphorus oolitic hematite is widely distributed in Hubei, Hunan, Jiangxi, Guizhou, Yunnan, Guizhou, Sichuan, and Gansu provinces, with proven reserves of 3.74 billion tons. This type of ore is most concentrated in western Hubei and western Hunan, with a reserve of 2 billion tons and an average iron grade of 41.6%, P 2 o 5 The content is 0.5% to 1.2%. Phosphorus in the ore exists in the form of collophosite, disseminated on the edge of iron oxide minerals, embedded in quartz and carbonate minerals, and a small amount exists in the lattice of iron minerals. Separated, it cannot be directly used as qualified iron concentrate for blast furnace ironmaking. [0003] With the gradual i...

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Problems solved by technology

Phosphorus in the ore exists in the form of collophosite, disseminated on the edge of iron oxide minerals, embedded in quartz and carbonate minerals, and a small amount exists in the lattice of iron minerals. Separated, cannot be directly used as qualified iron concentrate for blast furnace ironmaking

[0003] With the gradual increase in the demand for iron ore in my country's iron and steel industry, more and more attention has been paid to the research on the preparation of iron concentrates for ironmaking from "Ningxiang-style" high-phosphorus oolitic hematite. The techniques include magnetization roasting-weak magnetic separation and blending process, stage grinding gravity separation-strong magnetic separation process, direct reduction process, etc., but none of them can achieve the purpose of effectively reducing phosphorus on the basis of ensuring the iron recovery rate. Iron concentrate is too high in phosphorus to be used directly in ironmaking

Some scholars have also carried out the experimental research work of conventional mineral processing-sulfuric acid leaching, and obtained iron concentrate products with high iron grades for ironmaking, but there are problems such as low acid leaching efficiency, large acid consumption, high leaching iron loss, and excessive phosphorus content in the concentrate. The problem of poor economy

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