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A process for preparing titanium dioxide raw material from titanium-containing blast furnace slag

A blast furnace slag and raw material technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of large acid consumption, large waste acid discharge, environmental impact, etc., and achieve the effect of environmental protection and economic benefits

Active Publication Date: 2019-09-27
钢研晟华科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a process for preparing titanium white raw material from titanium-containing blast furnace slag, which is used to solve the problems of large acid consumption, large waste acid discharge and environmental impact when the existing sulfuric acid method is used to treat titanium-containing blast furnace slag. problems affecting

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  • A process for preparing titanium dioxide raw material from titanium-containing blast furnace slag

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Embodiment 1

[0057] In the high-titanium type blast furnace slag used in this embodiment: TiO 2 Content 20.86%, CaO content 25.62%, SiO 2 Content 24.41%, Al 2 o 3 The content is 12.65%, and the MgO is 9.88%. The above-mentioned high-titanium type blast furnace slag, Na 2 CO 3 and graphite powder in proportion to prepare carbon-containing composite pellets, wherein, Na 2 CO 3 As a sodiumizing agent, graphite powder as a carbonaceous reducing agent, Na in carbon-containing composite pellets 2 CO 3 The molar ratio of the added amount of graphite powder to the acidic oxide oxide of titanium-containing blast furnace slag is 1.5, and the added amount of graphite powder and Na 2 CO 3 The mass ratio is 0.115; the acidic oxide refers to the total amount of titanium oxide, silicon oxide and aluminum oxide.

[0058] After the carbon-containing composite pellets are dried, they are kept in a corundum crucible at 1150°C to 1300°C for 120 minutes for carbothermal sodium treatment. After reachi...

Embodiment 3

[0067] The composition of the high-titanium blast furnace slag and the preparation method of the carbon-containing composite pellets in this example are the same as those in Example 1.

[0068] The hydrolyzed slag obtained from sodium treatment slag at 1200°C was crushed and ground, hydrolyzed and washed with water, mixed with 22% dilute sulfuric acid at a liquid-to-solid ratio of 15:1, and then acid-leached for 120 minutes, and the solid-liquid separation was achieved through a vacuum filter device. dissolved into the liquid phase. This shows that dilute sulfuric acid has a stronger dissolving ability for titanium in hydrolysis slag than dilute hydrochloric acid.

[0069] The titanium-containing liquid was boiled and hydrolyzed for 120 minutes, and solid-liquid separation was performed after cooling. The filter residue was pickled with 5% dilute sulfuric acid, washed with deionized water three times, and then dried. After calcination at 950°C for 60 minutes, the titanium grad...

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Abstract

The invention relates to a process for preparing a titanium oxide raw material from titanium-containing blast furnace slag. The method comprises the following steps: step 1, preparing carbon-containing composite pellets by using the titanium-containing blast furnace slag, a carbonaceous reducing agent and a sodiumizing agent as raw materials; step 2, performing sodiumizing treatment on the carbon-containing composite pellets to obtain sodiumized slag; step 3, crushing and grinding the sodiumized slag, and performing hydrolysis to obtain hydrolysis slag and a first filtrate; step 4, performingacid leaching on the hydrolysis slag by using a dilute acid to obtain a titanium-containing liquid and first filter residues; and treating the first filtrate with slaked lime to obtain a second filtrate; and step 5, performing boiling hydrolysis on the titanium-containing liquid to obtain a waste acid and second filter residues, and roasting the second filter residues to obtain the titanium oxideraw material. According to the process provided by the invention, the carbothermal sodiumization process is adopted to treat the titanium-containing blast furnace slag, perovskite is converted into sodium titanate, and after hydrolysis treatment is performed, the sodium titanate is converted into amorphous titanic acid capable of being dissolved into a dilute acid and a recyclable sodium salt, sothat the process effectively utilizes waste acids in a titanium dioxide enterprise, the waste acids obtained by hydrolysis of the titanium-containing liquid can be recycled, and no waste-acid emissionis generated.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of metallurgical solid waste, in particular to a process for preparing titanium dioxide raw material from titanium-containing blast furnace slag. Background technique [0002] More than 90% of China's titanium resources are distributed in the Panxi region, mainly in the form of vanadium-titanium magnetite, with reserves of more than 1 billion tons. Vanadium-titanium magnetite is a compound ore in which iron, vanadium, titanium and other valuable elements are symbiotic. After beneficiation, about 50% of titanium, 70% of iron and vanadium enter the iron concentrate, and then the blast furnace process is mainly used to recover the Vanadium-containing molten iron and titanium-containing blast furnace slag limit the economical efficiency of titanium recycling due to the low grade of titanium (about 20%). Titanium-containing blast furnace slag has not been effectively utilized, and it ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/053
Inventor 张俊沈朋飞郭玉华
Owner 钢研晟华科技股份有限公司