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

A technology of hematite and high-phosphorus oolites is applied in the field of iron ore dephosphorization, which can solve the problems of unqualified iron ore concentrate use, inability to guarantee iron recovery rate, and excessive phosphorus content in concentrate, etc., and achieves control of acid leaching time, The effect of low production cost and strong ore adaptability

Active Publication Date: 2013-09-04
陕西延长石油矿业有限责任公司
View PDF5 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Acid leaching technology for eroding silicon, preserving iron and removing phosphorus in high phosphorus oolitic hematite
  • Acid leaching technology for eroding silicon, preserving iron and removing phosphorus in high phosphorus oolitic hematite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] refer to figure 1 Schematic diagram of the process flow for acid leaching of high phosphorus oolitic hematite, the specific process is as follows:

[0030] Step 1, to 100kg iron grade is 46.67%, P 2 o 5 The high-phosphorus oolitic hematite with a mass percentage of 0.87% was successively crushed, wet coarse grinding, spiral chute gravity separation, wet fine grinding, strong magnetic separation and flotation according to the conventional beneficiation process to obtain a mass percentage concentration of 23.2 % iron coarse concentrate pulp, the pulp contains 71.82kg iron coarse concentrate (iron grade is 57.76%, P 2 o 5 The mass percent content is 0.79%); using a cyclone to concentrate the ore slurry to a concentration of 60% in the mass percent of the iron coarse concentrate in the ore slurry;

[0031] Step 2. Put the thickened ore slurry in step 1 into a horizontal mixer (such as lime kiln, rotary kiln and other equipment with similar design principles), and then a...

Embodiment 2

[0034] The present embodiment is the same as embodiment 1, wherein the difference is that the iron retaining agent is ferric sulfate, ferric nitrate, ammonium ferrous sulfate, ferrous sulfate, ferrous nitrate or ferrous chloride, or ferric sulfate, Two or more of ferric chloride, ferric nitrate, ferrous ammonium sulfate, ferrous sulfate, ferrous nitrate and ferrous chloride, the silicon etching agent is hydrofluoric acid, ammonium fluoride, potassium fluoride or fluorine Silver chloride, or two or more of hydrofluoric acid, sodium fluoride, ammonium fluoride, potassium fluoride and silver fluoride.

Embodiment 3

[0036] refer to figure 1 Schematic diagram of the process flow for acid leaching of high phosphorus oolitic hematite, the specific process is as follows:

[0037] Step 1, to 100kg iron grade is 46.67%, P 2 o 5 The high-phosphorus oolitic hematite with a mass percentage of 0.87% was successively crushed, wet coarse grinding, spiral chute gravity separation, wet fine grinding, strong magnetic separation and flotation according to the conventional beneficiation process to obtain a mass percentage concentration of 23.2 % iron coarse concentrate pulp, the pulp contains 71.53kg iron coarse concentrate (iron grade is 58%, P 2 o 5 The mass percent content is 0.6%); using a cyclone to concentrate the ore pulp to a concentration of 70% by mass percentage of iron coarse concentrate in the ore pulp;

[0038] Step 2. Put the thickened ore slurry in step 1 into a horizontal mixer (such as lime kiln, rotary kiln and other equipment with similar design principles), and then add industrial...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

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...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/11
Inventor 尹双良李骥孟庆宇李建龙刘建国
Owner 陕西延长石油矿业有限责任公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap