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

A technology for high-phosphorus iron ore and weak magnetic separation, which is applied in the fields of mineral processing and iron ore beneficiation, can solve the problems of complex, phosphorus-reducing methods, ineffective utilization of iron ore resources, and fine-grained embedded phosphorus minerals. Good effect of iron extraction and phosphorus reduction

Inactive Publication Date: 2009-06-17
昆明晶石矿冶有限公司
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  • Application Information

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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,...

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] Embodiment 1: The raw material comes from a certain area in Sichuan containing 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. Crush the ore to less than -5mm, dry it in a roasting furnace at a drying temperature of 800°C and a drying time of 40 minutes, grind it to a particle size of less than 0.154mm, add 15wt% coke and 35wt% CaCl 2 After mixing, make 3-15mm pellets; the pellet sample is dried in the roaster until the water content is e After magnetic separation by permanent magnet magnetic separator, magnetically separated iron concentrate is obtained. The magnetic separation iron concentrate is dehydrated and dried to obtain the iron concentrate. The iron concentrate product can be obtained 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%. See Table 3 for details of beneficiation indicators. ...

Embodiment 2

[0024] Embodiment 2:: The raw material comes from high phosphorus iron ore in a certain place in Yunnan, and 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, it is made into pellets; it is dried in a roaster, and then placed in a roaster for chlorination segregation roasting. The chlorination segregation temperature is 900°C, and the chlorination segregation time is 120 minutes; the roasted material is quenched with water Grinding and grading to 0.074mm accounts for 70.12%, and the overflow of the classifier enters the magnetic field with a strength of 1500 O e The magnetic separation iron concentrate is obtained after magnetic separation by the permanent magnet magnetic separator. The magnetic separation iron concentrate is dehydrated and dried to obtain the iron co...

Embodiment 3

[0032] Example 3: The raw material comes from a high-phosphorus, high-sulfur, high-arsenic oolitic hematite in a certain place in Yunnan. The sample is massive and relatively hard. In the sample, red limonite accounts for the main part, followed by iron carbonate, magnetic iron, pyrite, iron silicate and so on. 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, it is made into pellets; the dried pellets are placed in a roaster for chlorination segregation roasting, the chlorination segregation temperature is 950 ° C, and the segregation time is 75 minutes; the roasted materials are quenched in water and then ground The ore is graded to -0.074mm, accounting for 78.12%; the grader overflows into the magnetic field with a strength of 1500 O e The permanent magnet magnetic separator is used to obtain magnetically separated iron concentrate after magnetic separ...

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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 method for phosphorus reduction of high-phosphorus iron ore, which belongs to the technical field of mineral processing. It is especially involved in the field of iron ore beneficiation with the characteristics of fine 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 been gradually exhausted. The currently available iron ore resources tend to be poor, fine and miscellaneous. The content of harmful impurities such as sulfur, phosphorus, and silicon dioxide in my country's iron ore resources is high, and they are embedded with useful minerals, resulting in difficult ore dressing, low efficiency, and poor product quality. Phosphorus is one of the main harmful elements in the iron and steel smelting process, whic...

Claims

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Application Information

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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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