Method for preparing high-grade artificial rutile from high-calcium and high-magnesium rock-mineral ilmenite

A technology of artificial rutile and ilmenite, applied in the direction of titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of equipment corrosion, difficult removal of calcium and magnesium, high energy consumption, and achieve the effect of mild reaction conditions

Inactive Publication Date: 2016-02-03
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can obtain TiO 2 Artificial rutile with a content greater than 99.5%, but the obtained hydrolysis waste liquid contains a large amount of free sulfuric acid, sulfate of iron and magnesium, etc., which is difficult to handle
[0004] To sum up, at present, with Panxi ilmenite as raw material in my countr

Method used

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  • Method for preparing high-grade artificial rutile from high-calcium and high-magnesium rock-mineral ilmenite
  • Method for preparing high-grade artificial rutile from high-calcium and high-magnesium rock-mineral ilmenite

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0030] Example one

[0031] (1), ilmenite concentrate finely ground below 50μm and ammonium sulfate ((NH 4 ) 2 SO 4 ) Mix uniformly and control the mass ratio of ilmenite concentrate and ammonium sulfate to 1:14.

[0032] (2) Put the mixture obtained in step (1) into a tube furnace, ° C / min increased to 250 ° C and keep for 240min. After the reaction, continue to divide the material to 10 ° C / min is heated to 430℃ with the furnace and kept for 240min. After the reaction, the materials were taken out and cooled to room temperature naturally to obtain a massive solid.

[0033] (3) Leach the massive solid obtained in step (2) with water, and control the leaching temperature to 90 ° C reaction time 10min, liquid-solid mass ratio 3:1. After the reaction, the solution was cooled to room temperature and filtered to obtain a filter residue.

[0034] (4) The filter residue obtained in step (3) is leached with 2.5% HCl, and the reaction temperature is controlled to 80 ° C reaction time 30min...

Example Embodiment

[0036] Example two

[0037] (1), ilmenite concentrate finely ground below 50μm and ammonium sulfate ((NH 4 ) 2 SO 4 ) Mix uniformly and control the mass ratio of ilmenite concentrate and ammonium sulfate to 1:5.

[0038] (2) Put the mixture obtained in step (1) into a tube furnace, ° C / min heating up to 360 ° C and keep for 120min. After the reaction, continue to divide the material to 10 ° C / min is heated to 560℃ with the furnace and kept for 120min. After the reaction, the materials were taken out and cooled to room temperature naturally to obtain a massive solid.

[0039] (3) Leach the massive solid obtained in step (2) with water, and control the leaching temperature to 40 ° C reaction time is 90min, liquid-solid mass ratio is 15:1. After the reaction, the solution was cooled to room temperature and filtered to obtain a filter residue.

[0040] (4) The filter residue obtained in step (3) is leached with a mass fraction of 10% HCl, and the reaction temperature is controlled to 6...

Example Embodiment

[0042] Example three

[0043] (1), ilmenite concentrate finely ground below 50μm and ammonium sulfate ((NH 4 ) 2 SO 4 ) Mix uniformly and control the mass ratio of ilmenite concentrate and ammonium sulfate to 1:20.

[0044] (2) Put the mixture obtained in step (1) into a tube furnace, ° C / min increased to 420 ° C and keep for 60min. After the reaction, continue to divide the material to 10 ° C / min is heated to 650℃ with the furnace and kept for 60min. After the reaction, the materials were taken out and cooled to room temperature naturally to obtain a massive solid.

[0045] (3) Leach the massive solid obtained in step (2) with water, and control the leaching temperature to 40 ° C reaction time is 50min, liquid-solid mass ratio is 10:1. After the reaction, the solution was cooled to room temperature and filtered to obtain a filter residue.

[0046] (4) The filter residue obtained in step (3) is leached with 1% HCl, and the reaction temperature is controlled to 100 ° C reaction time...

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Abstract

The invention discloses a method for preparing high-grade artificial rutile from high-calcium and high-magnesium rock-mineral ilmenite. The method comprises the following steps: step 1, sulfating and decomposing ilmenite at low temperature and converting titanium, iron, calcium, magnesium and other metal components into corresponding sulfates; step 2, selectively decomposing solid products obtained in the step 1 at moderate temperature to enable TiOSO4 to be resolved into water-insoluble TiO2, (NH4)2Fe(SO4)2 to be resolved into soluble FeSO4 and Fe2(SO4)3 and CaSO4, MgSO4, FeSO4, Fe2(SO4)3 and the like to be not resolved or almost not resolved; step 3, immersing a roasted product obtained in the step 2 with water to enable sulfates of soluble iron, calcium and magnesium to be dissolved so as to effectively separate TiO2 from other metal components to obtain titanium slag; step 4, adopting diluted hydrochloric acid to leach titanium slag in the step III so as to remove insoluble iron oxides generated by decomposition of a small quantity of FeSO2 and Fe2(SO4)3 in the moderate-temperature roasting process; step 5, performing alkaline treatment on the titanium slag obtained in the step 4 to remove acid-insoluble SiO2 in titanium slag; step 6, calcining and transforming the titanium slag obtained in the step 5 to obtain rutile titanium dioxide slag (artificial rutile).

Description

technical field [0001] The invention belongs to the technical field of chemical metallurgy, and mainly relates to a method for preparing artificial rutile from ilmenite, in particular to a method for preparing high-grade artificial rutile from rock ore-type ilmenite with high calcium and magnesium content. Background technique [0002] At present, the production methods of titanium dioxide are mainly sulfuric acid method and chlorination method. The sulfuric acid method can use low-grade ilmenite as raw material, but the process is long, the production process is discontinuous, the equipment is huge, and the amount of "three wastes" is large, which has caused serious environmental problems. At present, about 60% of titanium dioxide in the world is produced by the chlorination process. The chlorination process has the advantages of short process, low cost, and high product quality, but the chlorination process requires high-grade rutile as raw material. The global natural ru...

Claims

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Application Information

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IPC IPC(8): C01G23/053
Inventor 李春刘维燥梁斌
Owner SICHUAN UNIV
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