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Method for reducing phosphorus by chloridization separation-weak of high phosphor iron ore

A high-phosphorus iron ore and weak magnetic separation technology, which is applied in the field of iron ore beneficiation and mineral processing, can solve the problems of fine and complex embedded particle size of phosphorus minerals, and the ineffective utilization of iron ore resources by phosphorus reduction methods.

Inactive Publication Date: 2010-09-01
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

Method used

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  • Method for reducing phosphorus by chloridization separation-weak of high phosphor iron ore
  • Method for reducing phosphorus by chloridization separation-weak of high phosphor iron ore
  • Method for reducing phosphorus by chloridization separation-weak of high phosphor iron ore

Examples

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Effect test

Embodiment 1

[0017] Example 1: The raw material comes from a certain area in Sichuan that contains 33-42wt% iron and about 1.30wt% phosphorus. The raw material contains limonite, hematite, and iron minerals such as pyrite, iron carbonate and iron silicate. The ore is crushed to below -5mm, dried in a roaster at 800℃, drying time 40min, ground to a particle size of less than 0.154mm, 15wt% coke and 35wt% CaCl are added 2 After mixing, make 3-15mm pellets; pellet samples are dried in a roasting furnace to a moisture content of e After magnetic separation of the permanent magnet magnetic separator, the iron ore concentrate is obtained. After the magnetic separation iron concentrate is dehydrated and dried, an iron concentrate can be obtained, and an iron concentrate product with a yield of 37.03%, an iron grade of 81.94%, a phosphorus content of 0.22%, and an iron recovery rate of 85.02% can be obtained. The beneficiation index is detailed in Table 3.

[0018] Table 1 Phase analysis of raw ore i...

Embodiment 2

[0024] Example 2: The raw material comes from a high-phosphorus iron ore in a certain place in Yunnan. The iron is mainly iron carbonate and limonite, followed by hematite, magnetic iron, pyrite, and iron silicate. The raw ore contains about 40wt% iron, about 1wt% phosphorus, and less than 0.20wt% sulfur. Add 12% coke and 25% CaCl 2 After mixing with the powder, pellets are formed; dried in a roasting furnace, and then placed in the roasting furnace for chlorination segregation roasting, the chlorination segregation temperature is 900℃, and the chlorination segregation time is 120min; the roasted material is quenched by water Grinding and classifying to 0.074mm accounted for 70.12%, the overflow of the classifier into the magnetic field intensity is 1500O e The permanent magnetic separator obtained magnetic separation iron ore after magnetic separation. After the magnetic separation iron ore is dehydrated and dried, the iron concentrate can be obtained. The yield rate is 41.24%,...

Embodiment 3

[0032] Example 3: The raw material comes from high-phosphorus, high-sulfur, and high-arsenic oolitic hematite from a certain place in Yunnan. The sample is massive and has a relatively large hardness. The original ore has a very fine grain size and is densely distributed. Hematite occupies the main part of the sample, followed by iron carbonate, magnetic iron, pyrite, and iron silicate. The raw ore contains about 36wt% iron, about 1.90wt% phosphorus, about 1.00wt% sulfur, and about 0.10wt% arsenic. Add 15% coke and 40% CaCl 2 After mixing with the powder, the pellets are formed; the dried pellets are put into the roasting furnace for chlorination segregation roasting, the chlorination segregation temperature is 950℃, and the segregation time 75min; the roasted material is water quenched and then ground The ore is classified to -0.074mm, accounting for 78.12%; the overflow of the classifier into the magnetic field intensity is 1500O e After magnetic separation, the magnetic sepa...

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Abstract

The invention relates to a chloridizing segregation-low-intensity magnetic separation method for reducing phosphorus of a high phosphorus iron ore. A chloridizing segregation-low intensity magnetic separation process is adopted to realize iron increase and phosphorous reduction in the method. A chlorinating agent and a reducing agent coke are added to the high phosphorus iron ore and mixed evenly, then chloridizing segregation roasting is carried out in a roasting furnace; the roasted product is water quenched and ball milled, and then separated by a low-intensity magnetic field magnetic separator, thus being capable of obtaining an iron ore concentrate with the iron grade more than 80%, the iron recovery rate more than 85% and the phosphorous content less than 0.20%. The iron ore concentrate powder can be taken as a raw material for smelting pig iron after being pelletized. Additionally, with regard to high phosphorus iron ores which contain sulfur or contain sulfur and arsenic at the same time, such as hematite, hematite-limonite ore, oolitic hematite-limonite ore, hematite, siderite and the like, the product iron ore concentrate with the sulfur content less than 0.20% and the arsenic content less than 0.04% can also be obtained.

Description

1. Technical Field: [0001] The invention relates to a chlorination segregation-weak magnetic separation and phosphorus reduction method for high-phosphorus iron ore, which belongs to the technical field of mineral processing. In particular, it relates to the field of iron ore beneficiation with the characteristics of fine embedded particle size, complex ore composition and high phosphorus content. 2. Background technology: [0002] With the rapid development of modern industry, my country's limited rich ore and easy-to-select resources have gradually dried up. The currently available iron ore resources tend to be poor, fine and miscellaneous. my country's iron ore resources contain high levels of harmful impurities such as sulfur, phosphorus, and silicon dioxide, and are interspersed with useful mineral particles, resulting in difficult beneficiation, low efficiency and poor product quality. Phosphorus is one of the main harmful elements in the steel smelting process, which ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B1/14B03B7/00B03B5/52B03C1/02
Inventor 肖军辉张昱
Owner 昆明晶石矿冶有限公司
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