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Method for preparing nano titanium dioxide by titaniferous tailings after beneficiating iron

A nano-titanium dioxide and iron beneficiation technology, which is applied in the field of comprehensive utilization of mineral resources, can solve the problems of difficult to achieve monomer dissociation, fine ore embedded particle size, and difficulty in comprehensive recovery of titanium, so as to save the beneficiation process, shorten the process, and expand the The effect of using ideas

Inactive Publication Date: 2014-12-17
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
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Problems solved by technology

Due to the high temperature (1250°C) treatment of the ore, about 40% of the titanium is coated in the solid solution formed by roasting. In addition, the particle size of the ore is extremely fine, and it is difficult to achieve monomer dissociation, so the subsequent use of conventional mineral processing technology Process comprehensive recovery of titanium is very difficult

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  • Method for preparing nano titanium dioxide by titaniferous tailings after beneficiating iron

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Effect test

Embodiment 1

[0020] A method for preparing nano-titanium dioxide from titanium-containing iron dressing tailings, the specific embodiment is that the titanium-containing iron dressing tailings are ground to -200 mesh and not less than 95%, and then mixed with concentrated sulfuric acid with a concentration greater than 70% according to the mass ratio of 5. : 1 ratio, roasting at 280 ° C for 3 hours, so that the titanium metal in it becomes soluble sulfate, then add the concentrated sulfuric acid leaching of 2 times the mass of the titanium-containing iron tailings, and then 5 times the titanium-containing iron tailings After diluting the leaching solution with iron powder containing 5% of the mass of titanium-containing iron tailings, green vitriol crystals are precipitated at 0 ° C, the obtained solution is heated to boiling and hydrolyzed, and the resulting solid is dried and then roasted at 800 ° C for 2 Hour. The resulting product TiO 2 The grade reaches 93.6%, and its particle size i...

Embodiment 2

[0022] A method for preparing nano-titanium dioxide from titanium-containing iron dressing tailings, the specific embodiment is that the titanium-containing iron dressing tailings are ground to -200 mesh and not less than 95%, and then mixed with concentrated sulfuric acid with a concentration greater than 70% according to the mass ratio of 4. : 1 ratio, roasting at 300 ℃ for 3 hours, so that the titanium metal in it becomes soluble sulfate, then add the concentrated sulfuric acid leaching of 2 times the mass of the titanium-containing iron tailings, and then use 10 times the titanium-containing iron tailings. After diluting the leaching solution with iron powder containing 15% of the mass of iron tailings containing titanium, green vitriol crystals were precipitated at 10 ° C, the obtained solution was heated to boiling and hydrolyzed, and the resulting solid was dried and then roasted at 700 ° C. 2 hours. The resulting product TiO 2 The grade reaches 92.3%, and its particle...

Embodiment 3

[0024] A method for preparing nano-titanium dioxide from titanium-containing iron dressing tailings, the specific embodiment is that the titanium-containing iron dressing tailings are ground to -200 mesh and not less than 95%, and then mixed with concentrated sulfuric acid with a concentration greater than 70% according to the mass ratio of 2. : 1 ratio, roasting at 260 ° C for 3 hours, so that the titanium metal in it becomes soluble sulfate, then add the concentrated sulfuric acid leaching of 2 times the mass of the titanium-containing iron tailings, and then 8 times the titanium-containing iron tailings After diluting the leaching solution with iron powder containing 10% of the mass of titanium-containing iron tailings, green vitriol crystals are precipitated at 5 ° C, the obtained solution is heated to boiling and hydrolyzed, and the resulting solid is dried and then roasted at 600 ° C. 2 hours. The resulting product TiO 2 The grade reaches 92.7%, and its particle size is...

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Abstract

The invention relates to a method for preparing nano titanium dioxide by titaniferous tailings after beneficiating iron. The method comprises the following steps of: mixing a certain amount of ground titaniferous tailings after beneficiating iron and an appropriate amount of concentrated sulfuric acid and roasting, wherein titanium becomes soluble sulfate; then, adding concentrated sulfuric acid to leach; diluting and filtering; separating out ferrous sulfate crystals at a low temperature by reducing the leaching liquid through iron powder; heating the residual liquor to be boiled and hydrolyzed; and drying generated solid, and then roasting and grinding to obtain the nano titanium dioxide. The recovery rate of TiO2 exceeds 60%, and the grade reaches 92%. The method provided by the invention expands the train of thought of recycling tailings, shortens the flow of processing and utilizing minerals and improves the comprehensive utilization effect of mineral resources.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of mineral resources, relates to the recycling and utilization of titanium-containing iron beneficiation tailings, and in particular relates to a method for preparing nano-titanium dioxide from titanium-containing iron beneficiation tailings. Background technique [0002] The ilmenite from Liupanshui, Guizhou has a very complex mineralogy in structure, and the embedded particle size is extremely fine, about 5 μm. Only solid-state direct reduction can be used for iron selection. The original intention of the solid-state reduction method is that after the reduced elemental iron is selected, the remaining titanium sponge can be sold directly or after simple treatment. However, after the ore samples in this area were subjected to solid-state reduction and iron selection, the TiO in the tailings 2 The grade is only about 11%, which is far from meeting the market requirements. Due to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/047B82Y30/00C22B34/12
Inventor 卜显忠宛鹤张崇辉
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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