Iron increase and phosphorous reduction method for oolitic high phosphorus hematite

A technology of hematite and high phosphorus is applied in the field of iron extraction and phosphorus reduction of oolitic high phosphorus hematite, which can solve the problems of difficulty in sorting and separation, the iron ore resources of iron extraction and phosphorus reduction technology have not been effectively exploited and utilized, and the like, To achieve the effect of simple process, low quality and ore particle size requirements, and no power consumption

Inactive Publication Date: 2009-05-27
周玉平
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the extremely fine grains of hematite (<10μm), it is quite difficult to sort and separate. Therefore, there is no reasonable and feasible technology for increasing iron and reducing phosphorus in oolitic high-phosphorus hematite, so this part of iron ore resources has not been effectively exploited. use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Example 1: The method for reducing iron and phosphorus from oolitic high-phosphorus hematite is carried out according to the following steps:

[0020] ①Select phosphorus-containing oolitic hematite, and its TFe>42%, the hematite is crushed to a particle size not greater than 0.25mm, the ore powder is sieved and added into the roasting furnace. The heating fuel in the furnace is gas or oil, and the atmosphere in the furnace is a neutral atmosphere.

[0021] ②Push a sufficient amount of reducing gas CO into the roasting furnace. CO is produced in a gas generator under normal pressure. The crushed material undergoes reduction reaction in a multi-tube rotary roasting furnace at 900°C, and the reduction time is 30 minutes. , The hematite is reduced to metallic iron, and the metallic iron ore powder grows to tens of microns through diffusion and aggregation at high temperatures.

[0022] ③The reduced minerals are cooled to 80℃ through oxygen isolation and then magnetically separa...

Embodiment 2

[0028] Example 2: The method for reducing iron and phosphorus from oolitic high-phosphorus hematite is carried out according to the following steps:

[0029] ①Select a quantitative phosphorus-containing oolitic hematite, its TFe>40%, after crushing and sieving the hematite, pour the 0.12 mm particle size into the roasting furnace, the heating fuel in the furnace is gas or oil, and the atmosphere in the furnace is a neutral atmosphere.

[0030] ②Push a sufficient amount of reducing gas CO into the roaster, and the crushed material will undergo a reduction reaction in the multi-tube thermocyclone roaster at 1400°C. The reduction time is 58 minutes to reduce the hematite to metallic iron. The metal iron ore powder grows to tens of microns by diffusion and aggregation.

[0031] ③The reduced minerals are cooled to 20℃ through oxygen isolation and then magnetically separated. The coarse iron powder obtained is added with 1.4 kg of sodium silicate as a dispersant per ton. Sodium silicate...

Embodiment 3

[0033] Example 3: The method for reducing iron and phosphorus from oolitic high-phosphorus hematite is carried out according to the following steps:

[0034] ①Choose a quantitative amount of phosphorus-containing oolitic hematite, crush and siev the hematite, pour the 0.24mm particle into the roaster, the heating fuel in the furnace is gas, and the atmosphere in the furnace is neutral. .

[0035] ②Push a sufficient amount of reducing gas CO into the roaster, and the crushed material will undergo a reduction reaction at 830℃ in the multi-tube thermocyclone roaster. The reduction time is 45 minutes to reduce the hematite to metallic iron. The metal iron ore powder grows to tens of microns by diffusion and aggregation.

[0036] ③The reduced minerals are cooled to 50℃ through oxygen barrier and then magnetically separated. The coarse iron powder obtained is added with 1.1 kg of sodium silicate as a dispersant per ton. Sodium silicate is commonly known as water glass. Two ball milling ...

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Abstract

The invention discloses an iron-increasing phosphorous-reducing method for oolitic high-phosphorus hematite. The method comprises the following steps: (1) phosphorus-containing oolitic hematite is crushed till the particle size is not more than 0.25 millimeter, and then is added to a roaster; (2) a reduction chamber of the roaster is supplied with reduction gas, and crushed material is reduced for 10 to 60 minutes at a temperature between 700 and 1,450 DEG C in the roaster; (3) reduced mineral is isolated from oxygen, cooled to not higher than 100 DEG C and then magnetically separated; obtained coarse iron powder per ton is added with 1 to 1.5 kilograms of sodium silicate; the obtained coarse iron powder is ball-milled till the particle size is not more than 0.055 millimeter; obtained fine iron powder is immersed in acid solution with the concentration between 0.5 and 18 percent at normal temperature for 30 to 300 minutes; and the proportion of the acid solution to the fine iron powder is not less than 1:1; and (4) the fine iron powder is poured into a hydroextractor so as to reduce phosphoric acid. The method has the advantages of simple process, low requirement on the quality of raw material and the particle size of ore, no consumption of electric energy and high-quality coke, low energy consumption, high phosphorous reducing rate and high metal yield.

Description

Technical field [0001] The invention belongs to the technical field of improving iron and lowering phosphorus from weak magnetic iron ore, and in particular relates to an oolitic high-phosphorus hematite iron raising and lowering phosphorus method. Background technique [0002] Oolitic high-phosphorus hematite is also called "Ningxiang-style" high-phosphorus hematite, which has the characteristics of high phosphorus, high silicon, high aluminum, low sulfur, and medium-poor iron. The iron content of the ore is generally 35%-55%, and the phosphorus content is 0.4%-0.6%. Some ores contain more than 1.0% phosphorus. Some ore layers contain high CaO and are self-fluxing ore. This iron ore has an oolitic structure, and the hematite is scaly, fibrous and mixed with gangue minerals. As the grain size of hematite is extremely fine (<10μm), it is quite difficult to sort and separate, so the oolitic high-phosphorus hematite has no reasonable and feasible iron-increasing and phosphorus-re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/00C21B15/00B03C1/02
Inventor 周玉平
Owner 周玉平
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