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Method for preparing artificial rutile by microwave heating and oxidation sintering

An artificial rutile and oxidation roasting technology, which is applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of environmental pollution, artificial rutile cost increase, etc., and achieve the effect of simple equipment, low cost and improved activity

Inactive Publication Date: 2008-05-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent raw material is made of high calcium and magnesium content, TiO 2 If you want to produce high-grade artificial rutile from low-grade rich materials, you must go through acid leaching, which will inevitably increase the cost of the entire production of artificial rutile and bring pollution to the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: take by weighing 100g high-titanium slag, the chemical composition of slag is: the oxide content of titanium is 92.98wt%, S0.05wt%, P 0.018wt%, C 0.058wt%, the oxide of iron and iron is 5.26 wt%. Grind the raw materials to a particle size of ≤0.250mm, then put the raw materials into a microwave reactor with a microwave frequency of 2450MHz, and the oxygen flow rate is 50ml / min, so that the interior is always kept under an oxidizing atmosphere. The heating rate is 100 °C / min, heated to a temperature of 850 °C and maintained at this temperature for 40 min, and then cooled to room temperature to obtain Ti0 2 The artificial rutile with a grade of 90.13wt%, sulfur 0.028wt%, phosphorus 0.016wt%, and carbon 0.035wt% all exceeds the national standard for high-grade artificial rutile. It can be used as a raw material for the production of welding electrodes or high-grade titanium dioxide.

Embodiment 2

[0018] Embodiment 2: take by weighing 500g high titanium slag, the chemical composition of slag is: the oxide content of titanium is 93.89wt%, S 0.046wt%, P 0.014wt%, C 0.049wt% and iron and iron oxides are 4.16 wt%. Grind the raw materials until the particle size is ≤0.250mm, then put the raw materials into the microwave reactor, the oxygen flow rate is 100ml / min, the heating rate is 150°C / min, heated to a temperature of 900°C, and kept at this temperature for a period of time 30min, then cooled to room temperature to obtain TiO 2 Artificial rutile with a grade of 91.77wt%, sulfur 0.021wt%, phosphorus 0.013wt%, and carbon 0.027wt%.

Embodiment 3

[0019] Embodiment 3: take by weighing 1000g high-titanium slag, the chemical composition of slag is: the oxide content of titanium is 94.72wt%, S 0.035wt%, P 0.012wt%, C 0.036wt% and iron and iron oxide are 2.87 wt%. Grind the raw material to a particle size of ≤0.250mm, feed oxygen at a rate of 200ml / min, make the heating rate 200°C / min, heat to a temperature of 950°C and keep at this temperature for 20min, then cool to room temperature , to get TiO 2 The grade is 92.49wt%, sulfur 0.018wt%, phosphorus 0.011wt%, carbon 0.015wt% artificial rutile. It can be used as a raw material for the production of welding electrodes or high-grade titanium dioxide.

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Abstract

The invention relates to a method for manufacturing artificial rutile, and belongs to the technical field of metallurgy preparation. High titanium slag is used as a raw material, which is broken into pieces and heated by a microwave at the controlled temperature of 850-950 DEG C for 20-40 minutes, cooled to room temperature; thereby the artificial rutile is achieved of TiO2 with a grade of over 90 wt percent. Low-valent titanium in high tiranium slag is oxidized through oxidation calcination to realize the concentration of titanium components; thereby the rutile phase grows and roughens. Meanwhile, since the activity of the mineral surface of the high titanium slag can be enhanced by the microwave heating, the crystal transformation of TiO2 can be realized in relatively low temperature, and desulfuration and the decarburization can be realized.

Description

1. Technical field: [0001] The invention relates to a method for preparing artificial rutile, in particular to a method for preparing artificial rutile by microwave-heating high-titanium slag. It belongs to the technical field of metallurgical preparation. 2. Background technology: [0002] At present, the raw materials of chloride-process titanium dioxide such as natural rutile and artificial rutile are in short supply at home and abroad, and the reserves of natural rutile have plummeted, so the demand for artificial rutile is increasing. Known artificial rutile production methods mainly include: reducing rust method, hydrochloric acid leaching method and sulfuric acid leaching method, and these methods all use ilmenite as raw material. In the process of producing artificial rutile with ilmenite as raw material, the output of waste liquid, waste residue and waste gas is large, the process is long and the energy consumption is high. Therefore, it has become a trend to repl...

Claims

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Application Information

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IPC IPC(8): C01G23/07
Inventor 彭金辉陈晋张世敏陈菓
Owner KUNMING UNIV OF SCI & TECH
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