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Method of preparing low-calcium-and-magnesium titanium slag from Panzhihua titanium concentrate

A technology of titanium concentrate and titanium slag, applied in the direction of titanium dioxide, process efficiency improvement, titanium oxide/hydroxide, etc., can solve the problems of large investment in pressurized leaching equipment, low product quality, and long reduction time, and achieve Achieve large-scale production, low calcium and magnesium content, and reduce smelting power consumption

Inactive Publication Date: 2016-12-07
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the BCA method also has some disadvantages: the raw material it uses must be high-grade ilmenite placer, the price of heavy oil used as a reducing agent and fuel is relatively expensive, the reduction time is long, the investment in pressurized leaching equipment is large, and part of the leaching process will be produced. Fine-grained product, product quality is not high
However, a large number of our previous experimental results have proved that the titanium slag smelted from Panzhihua titanium concentrate cannot be prepared as a qualified raw material for the boiling chlorination process with low CaO and MgO only through conventional titanium slag smelting-redox modification-pressure acid leaching. Process to obtain products CaO+MgO≥3%, CaO≥1%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] This embodiment selects Panzhihua Titanium Concentrate 1#, its main component: TiO 2 46.76%, FeO 35.59%, Fe 2 o 3 5.12%, MgO 5.62%, CaO 1.03%, SiO 2 3.56%, ilmenite particle size less than 74um accounts for about 70%.

[0036] Step 1, ball milling the titanium concentrate for 1.5 hours, after ball milling, the particle size is below 200 mesh, accounting for 82%;

[0037] Step 2, the ball-ground ore is oxidized at 800° C. for 2 hours under the air atmosphere in the rotary kiln;

[0038] Step 3, leaching the oxidized ore with 10% hydrochloric acid at a liquid-solid ratio of 2:1L / kg and a temperature of 95°C for 6 hours, washing after the leaching is completed, and drying with the tail gas of a rotary kiln to obtain a pretreated titanium concentrate, the main components of which are : TiO 252.21%, TFe27.31%, MgO 1.62%, CaO 0.04%, SiO 2 5.56%;

[0039] Step 4. Mix the pretreated ore with a reducing agent such as coke, and make pellets into carbon pellets;

[0040...

Embodiment 2

[0044] This embodiment selects Panzhihua Titanium Concentrate 2#, its main component: TiO 2 48.21%, FeO 36.44%, Fe 2 o 3 5.70%, MgO 4.48%, CaO 0.63%, SiO 2 1.82%, ilmenite particle size less than 74um accounts for about 70%.

[0045] Step 1, ball milling the titanium concentrate for 2.5 hours, after ball milling, the particle size is below 200 mesh, accounting for 88%;

[0046] Step 2, the ball-milled ore is oxidized at 800°C for 2 hours under the air atmosphere in the rotary kiln;

[0047] Step 3, leaching the oxidized ore with 15% hydrochloric acid at a liquid-solid ratio of 2:1L / kg and a temperature of 105°C for 6 hours, washing after the leaching is completed, and drying with the tail gas of a rotary kiln to obtain a pretreated titanium concentrate, the main component of which is : TiO 2 57.62%, TFe28.12%, MgO 0.94%, CaO 0.03%, SiO 2 2.73%;

[0048] Step 4. Mix the pretreated ore with a reducing agent such as coke, and make pellets into carbon pellets;

[0049]...

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Abstract

The invention belongs to the field of chemical metallurgy, and particularly relates to a method for preparing low-calcium-and-magnesium titanium slag from Panzhihua titanium concentrate. According to the technical scheme for solving technical problems, the method comprises the following steps that a, the Panzhihua titanium concentrate is subjected to ball-milling, and oxidized at the temperature of 700-850 DEG C, pickled, filtered, washed and dried to obtain pretreated ore; b, pelletizing is conducted after the pretreated ore is evenly mixed with an excessive amount of a reductant, pellets are subjected to reduction at the temperature of 1,000-1,300 DEG C, and metallic pellets are prepared; and c, the metallic pellets are smelted, slag is discharged after smelting is completed and crushed after being cooled down, and then the low-calcium-and-magnesium titanium slag is obtained. According to the method for preparing the low-calcium-and-magnesium titanium slag from the Panzhihua titanium concentrate, the grade of TiO2 is promoted to 85% or above from around 46%; and further, the titanium slag is low in calcium content and magnesium content, moderate in granularity, and capable of being used as the raw material for preparing titanium dioxide by use of a chlorination boiling method.

Description

technical field [0001] The invention belongs to the field of chemical metallurgy, and in particular relates to a method for preparing low-calcium-magnesium-titanium slag from Panzhihua titanium concentrate. Background technique [0002] my country has rich reserves of titanium resources, but mainly Panzhihua ilmenite, which is rich in calcium and magnesium, is complex and multi-element, and is basically used as a raw material for sulfuric acid process titanium dioxide. In recent years, under the circumstance that the international titanium dioxide competition has become increasingly severe and the country has vigorously developed the chlorination method, it has become my country's titanium dioxide industry to use Panzhihua high-calcium magnesia ilmenite as raw material to prepare demanding titanium-rich raw materials for boiling chlorinated titanium dioxide. The focus and difficulty of development. [0003] More than 20 methods for preparing high-grade titanium-rich material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/24C01G23/047
CPCC01G23/047C22B1/2406Y02P10/20
Inventor 张溅波叶恩东韩可喜张兴勇
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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