Method for removing vanadium, manganese and chromium impurities in acid-soluble titanium slag

A technology containing vanadium, manganese, chromium and titanium slag, which is applied in the field of titanium slag smelting, can solve the problems of unfavorable effects of sulfuric acid process titanium dioxide production, low removal rate of impurity elements, etc., and achieve high production capacity, low ferrous content and high efficiency Effect

Active Publication Date: 2021-12-28
CENT SOUTH UNIV
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Problems solved by technology

[0008] In view of the technical problem that most of the vanadium, manganese and chromium in the ilmenite enter the titanium slag in the prior art, the removal rate of these impurity elements is low, which will have an adverse effect on the subsequent sulfuric acid process titanium dioxide production, the purpose of the present invention is to provide A method for removing vanadium, manganese and chromium impurities in acid-dissolved titanium slag

Method used

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  • Method for removing vanadium, manganese and chromium impurities in acid-soluble titanium slag
  • Method for removing vanadium, manganese and chromium impurities in acid-soluble titanium slag

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add ilmenite pre-reduced pellets, magnesium-containing additives and reducing agents into the electric furnace in proportion, add magnesite according to the MgO content in the slag is 10%, and TiO in the slag 2 FeO content ≥ 74wt%, FeO content ≤ 5wt%, smelting temperature 1600°C, smelting time 90min, carbon content 6% (coke), separated to obtain vanadium-manganese-chromium-containing semi-steel and acid-soluble titanium slag, and the obtained vanadium-manganese-chromium-containing iron water is used Vanadium, manganese and chromium were extracted in the converter. After analysis and detection, it was found that 90.47% of the vanadium, 92.08% of the manganese and 85.37% of the chromium in the raw material ilmenite entered the semi-steel, and the TiO-containing 2 It is 76.89% acid-soluble titanium slag, the ferrous content is 4.45%, and the V in the slag 2 o 5 、Cr 2 o 3 , MnO content are 0.04%, 0.038%, 0.079%, respectively, meet the acid-soluble titanium slag standard ...

Embodiment 2

[0030] Add ilmenite pre-reduced pellets, magnesium-containing additives and reducing agents to the electric furnace in proportion, add magnesium oxide according to the MgO content in the slag is 14%, and TiO in the slag 2 Content ≥ 74wt%, FeO content ≤ 5wt%, smelting temperature 1650°C, smelting time 60min, carbon content 7% (coal powder), separated to obtain vanadium-manganese-chromium-containing semi-steel and acid-soluble titanium slag, obtained vanadium-manganese-chromium-containing molten iron It is used to extract vanadium, manganese and chromium in the converter. After analysis and detection, it is found that 90.95% of the vanadium, 92.50% of the manganese and 86.29% of the chromium in the raw material ilmenite enter the semi-steel, and the TiO-containing 2 It is 75.65% acid-soluble titanium slag, the content of ferrous iron is 4.26%, and the V in the slag 2 o 5 、Cr 2 o 3 , MnO content are 0.038%, 0.036%, 0.074%, respectively, meet the acid-soluble titanium slag stan...

Embodiment 3

[0032] Add ilmenite pre-reduced pellets, magnesium-containing additives and reducing agents into the electric furnace in proportion, add magnesite according to the MgO content in the slag is 16%, and TiO in the slag 2 Content ≥ 74wt%, FeO content ≤ 5wt%, smelting temperature 1700°C, smelting time 60min, carbon content 8% (semi-coke), separated to obtain vanadium-manganese-chromium-containing semi-steel and acid-soluble titanium slag, and obtained vanadium-manganese-chromium-containing molten iron It is used to extract vanadium, manganese and chromium in the converter. After analysis and detection, it is found that 92.38% of the vanadium, 93.54% of the manganese and 87.04% of the chromium in the raw material ilmenite enter the semi-steel, and the TiO-containing 2 It is 74.89% acid-soluble titanium slag, ferrous content is 4.05%, V in the slag 2 o5 、Cr 2 o 3 , MnO content are 0.032%, 0.031%, 0.07%, respectively, meet the acid-soluble titanium slag standard (YB / T 5285-2011), is...

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Abstract

The invention discloses a method for removing vanadium, manganese and chromium impurities in acid-soluble titanium slag. The method comprises the following steps: adding ilmenite or an ilmenite pre-reduced product, a reducing agent and a magnesium-containing additive into an electric furnace for smelting at the smelting temperature of 1600-1800 DEG C to promote vanadium, manganese and chromium to be reduced into semisteel during smelting, separating slag from iron to obtain the semisteel containing vanadium, manganese and chromium and the acid-soluble titanium slag, and controlling a slagging system in the smelting process: the content of TiO2 in slag is greater than or equal to 74 wt%, the content of magnesium oxide is 10-16 wt%, and the content of FeO is less than or equal to 5 wt%. According to the slagging method, the magnesium oxide content of the titanium slag is increased, the ferrous content is reduced, vanadium, manganese and titanium impurities in the slag are reduced into molten iron, the vanadium, manganese and chromium impurities harmful to subsequent titanium dioxide production in the slag can be removed, the removal rate of vanadium and manganese is larger than 90%, the removal rate of chromium is larger than 85%, the titanium dioxide quality of a subsequent sulfuric acid method is improved, and the technical problem that impurities such as vanadium, manganese and chromium in the titanium slag are high in the process of preparing the acid-soluble titanium slag through electric furnace smelting ilmenite is solved.

Description

technical field [0001] The invention belongs to the technical field of titanium slag smelting, and in particular relates to a method for removing vanadium, manganese and chromium impurities in acid-soluble titanium slag. Background technique [0002] Titanium dioxide has the characteristics of stable chemical properties, strong hiding power, strong tinting power, and good dispersibility. It is an irreplaceable high-grade functional white pigment. It is widely used in coatings, rubber, paper and other fields. About 90% of the world's titanium dioxide The raw material is used to produce titanium dioxide. [0003] The industrial production methods of titanium dioxide mainly include the chlorination method and the sulfuric acid method. The chlorination method can only produce rutile titanium dioxide, which has high requirements for raw materials, and TiO2 is required. 2 ≥90%, CaO<0.2%, MgO<1.0% high-quality titanium-rich material. Two kinds of titanium dioxide products, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/12
CPCC22B34/1209Y02P10/20
Inventor 王帅郭宇峰陈凤杨凌志景建发
Owner CENT SOUTH UNIV
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