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Method for reducing phosphorus in high phosphorus haematite or hematite and limonite ore by magnetization roasting-leaching method

A magnetized roasting and red limonite technology, applied in iron ore phosphorus reduction, high phosphorus hematite red limonite magnetization roasting-leaching phosphorus reduction field, can solve the fine particle size of phosphorus mineral embedding, which affects iron Concentrate quality and marketability, complexity and other issues

Inactive Publication Date: 2009-01-07
昆明晶石矿冶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mineral composition of high-phosphorus iron ore in my country is relatively complex, and the embedded particle size of phosphorus minerals is relatively fine. There are the following problems in dephosphorization by mineral processing: first, the dephosphorization rate is low; second, the processing capacity of the ball mill is reduced due to fine grinding
For a long time, because there is no ideal method for reducing phosphorus, this part of iron ore resources cannot be effectively utilized, resulting in some mines stopping mining due to high phosphorus content, and some mines have seriously affected the production of iron concentrates due to the lack of phosphorus reduction. quality and marketability

Method used

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  • Method for reducing phosphorus in high phosphorus haematite or hematite and limonite ore by magnetization roasting-leaching method
  • Method for reducing phosphorus in high phosphorus haematite or hematite and limonite ore by magnetization roasting-leaching method
  • Method for reducing phosphorus in high phosphorus haematite or hematite and limonite ore by magnetization roasting-leaching method

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Example 1: The raw material comes from a certain area in Sichuan. The ore is crushed to below -3mm, and 5% coke (particle size -1mm) by weight of the raw material is added and mixed, and the mixed material is magnetized and roasted in a roasting furnace. The roasting temperature is 900℃, and the roasting time is 15min. The roasted materials are water-quenched and then classified by grinding (-0.074mm accounts for 70%). The overflow of the classifier enters the permanent magnetic separator with a magnetic field strength of 1200 Oe to obtain magnetism. Iron ore concentrate, the magnetic iron ore concentrate is filtered, dehydrated and dried with a concentration of 10wt% hydrochloric acid with twice the weight of the dry ore, then stirred and leached for 15 minutes, the leaching solution is taken out for centralized treatment, the leaching residue is rinsed three times and then filtered and dehydrated After drying, iron concentrate is obtained. The beneficiation index of iron ...

Embodiment 2

[0024] Example 2: The test ore sample comes from a certain area in Yunnan. The sample is mainly hematite ore. The sample is powdery, with a relatively fine particle size and easy to silt. The ore is crushed to less than -5mm, and 8% is added at the same time After the coke (particle size -1mm) is mixed, the mixed materials are magnetized and roasted in a roasting furnace at a roasting temperature of 950°C and a roasting time of 20 minutes. The roasted materials are water-quenched and then graded by grinding (-0.074mm accounts for 70.12%), the overflow of the classifier into the magnetic field intensity is 1000O e The magnetic separation iron ore is obtained after magnetic separation by the permanent magnetic separator. The magnetic separation iron ore is filtered, dehydrated and dried with 12wt% hydrochloric acid, mixed with water of twice the dry weight of the ore, and then stirred and leached for 15 minutes, and the leachate is taken out After intensive processing, the leaching ...

Embodiment 3

[0031] Example 3: The test ore sample comes from a high-phosphorus hematite from a certain place in Shaanxi Province. The sample is in block shape and has a relatively large hardness. The original ore has a finer grain size and a compact shape. It is a difficult to crush and easy to grind ore, but the ore is ground. In the process, sludge is easy to occur. The ore is crushed to below -3mm, and 6% coke (particle size -1mm) is added at the same time. After mixing, the mixed material is magnetized and roasted in a roasting furnace at a roasting temperature of 1000°C. , The roasting time is 10min, the roasted material is water-quenched and then classified by grinding (-0.074mm accounts for 75.12%), the overflow of the classifier enters the magnetic field with a strength of 1200O e The magnetic separation iron ore is obtained after magnetic separation by the permanent magnetic separator. The magnetic separation iron ore is filtered, dehydrated and dried with 20wt% sulfuric acid, mixed ...

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Abstract

The invention relates to a high phosphorus hematite-hematite-limonite magnetic roasting-extraction phosphorous reduction method, in particular applicable for an extraction phosphorous reduction method for the iron ores which mainly include the hematite-hematite and the limonite and accompany with magnetite, pyrrhotite, iron pyrites, etc. The method of the invention adopts magnetic roasting-wet extraction to reduce phosphorous; after carrying out modifying on high phosphorus iron ore, muriatic acid or vitriol is selected to carry out extraction phosphorous reduction on the iron concentrate obtained by a weak electromagnetic separator which not only can obtain the iron concentrate with an iron grade to be larger than 56 percent; simultaneously the content of the phosphorous in the iron concentrate is lower than 0.30 percent.

Description

1. Technical Field: [0001] The invention relates to a high-phosphorus hematite hematite hematite magnetized roasting-leaching method for phosphorus reduction, which is particularly suitable for hematite and hematite as the mainstay, accompanied by magnetite, pyrrhotite, and pyrite Wait for iron ore phosphorus reduction method. Belongs to the field of mineral processing engineering technology 2. Background technology: [0002] Experimental research on beneficiation of ferrous metal ore has played a very important role in accelerating the development of my country's iron and steel industry. Existing exploration results show that my country's ferrous metal ore resources are extremely rich. However, there are many types of iron ore deposits, complex in nature, and often symbiosis of multiple components. Since most iron ore contains useful components for comprehensive utilization or harmful impurities that should be removed, most of the ore needs to be processed. Our development and u...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/06B02C17/16B03C1/02
CPCY02P10/20
Inventor 肖军辉张昱陈晓鸣
Owner 昆明晶石矿冶有限公司
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