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Method for separating and recovering titanium dioxide from metal tailings

A technology for titanium dioxide and metal tailings, applied in the directions of titanium dioxide, chemical instruments and methods, titanium oxide/hydroxide, etc., to achieve the effects of considerable economic benefits, improved recovery rate and simple process

Pending Publication Date: 2021-02-09
陕西省地质调查实验中心
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for separating and recovering titanium dioxide from metal tailings, which can not only separate and recover titanium in metal tailings into high-purity titanium dioxide, but also separate and recover aluminum and iron in metal tailings into aggregated titanium dioxide. Ferric aluminum sulfate water purifier is used to improve the deficiency of the existing magnetic separation and flotation process for single recovery of titanium elements, and realize the comprehensive utilization of tailings. The implementation of this method has important practical significance

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  • Method for separating and recovering titanium dioxide from metal tailings
  • Method for separating and recovering titanium dioxide from metal tailings
  • Method for separating and recovering titanium dioxide from metal tailings

Examples

Experimental program
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Embodiment 1

[0052] The content of each component of the metal tailings of the present embodiment is as follows: SiO 2 —39.80%; Al 2 o 3 — 15.60%; Fe 2 o 3 —13.10%; CaO—10.3%; MgO—9.52%; CO 2 —5.95%; TiO 2 — 2.45%; Na 2 O—2.21%; P 2 o 5 —0.365%; K 2 O—0.309%; MnO—0.22%; SO 3 —0.102%.

[0053] The specific separation method is as follows:

[0054] Step 1: Mix metal tailings: mixed acid evenly according to the ratio of solid to liquid ratio of 1:10g / ml, stir for 30 minutes at a leaching temperature of 80°C, and filter through 400 mesh to obtain acid leaching solution A and acid leaching residue;

[0055] Wherein, the mixed acid is oxalic acid with a volume ratio of 5:1:5: citric acid: sulfuric acid mixing, the concentration of sulfuric acid is 4mol / L, the concentration of oxalic acid is 2mol / L, and the concentration of citric acid is 2mol / L;

[0056] Step 2, add 6mol / L sulfuric acid in the pickling solution A that step 1 obtains, to the H in the pickling solution A + The molar c...

Embodiment 2

[0063] The metal tailings of the present embodiment are the metal tailings in embodiment 1, and the specific separation method is as follows:

[0064] Step 1: Mix metal tailings: mixed acid evenly according to the ratio of solid to liquid ratio of 1:12g / ml, stir for 40min at a leaching temperature of 90°C, and filter through 400 mesh to obtain acid leaching solution A and acid leaching residue;

[0065] Wherein, the mixed acid is oxalic acid with a volume ratio of 6:1:5: citric acid: sulfuric acid mixing, the concentration of sulfuric acid is 6mol / L, the concentration of oxalic acid is 3mol / L, and the concentration of citric acid is 2mol / L;

[0066] Step 2, add 6mol / L sulfuric acid in the pickling solution A that step 1 obtains, to the H in the pickling solution A + The molar concentration ratio to Ti ions is 1:1, hydrolyzed at 90°C for 4 hours, filtered through 400 mesh to obtain precipitate and filtrate B, and then dried and calcined at 600°C for 5 hours to obtain titanium d...

Embodiment 3

[0073] The metal tailings of the present embodiment are the metal tailings in embodiment 1, and the specific separation method is as follows:

[0074] Step 1: Mix metal tailings: mixed acid evenly according to the ratio of solid to liquid ratio of 1:10g / ml, stir for 30min at a leaching temperature of 90°C, and filter through 400 mesh to obtain acid leaching solution A and acid leaching residue;

[0075] Wherein, the mixed acid is oxalic acid with a volume ratio of 8:1:10: citric acid: sulfuric acid mixed, the concentration of sulfuric acid is 4mol / L, the concentration of oxalic acid is 3mol / L, and the concentration of citric acid is 3mol / L;

[0076] Step 2, add 6mol / L sulfuric acid in the pickling solution A that step 1 obtains, to the H in the pickling solution A + The molar concentration ratio to Ti ions is 1:1, hydrolyzed at 90°C for 4 hours, filtered through 400 mesh to obtain precipitate and filtrate B, and then dried and calcined at 450°C for 6 hours to obtain titanium d...

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Abstract

The invention discloses a method for separating and recovering titanium dioxide from metal tailings. The method separates and extracts titanium, aluminum, iron and other components to obtain titaniumdioxide, a water purifying agent and other high-added-value products while effectively reducing the stockpiling amount of the metal tailings, thereby realizing efficient recovery and utilization of the metal tailings. The method mainly comprises the following steps: (a) uniformly mixing the metal tailings and mixed acid (formed by mixing oxalic acid, citric acid and sulfuric acid) according to a solid-to-liquid ratio of 1: (5-50) g / ml, conducting leaching, and performing filtering to obtain an acid leaching solution A and acid leaching residues; (b) adding sulfuric acid into the acid leachingsolution A, carrying out hydrolyzing and filtering to obtain a precipitate and a filtrate B, and drying and calcining the precipitate to obtain titanium dioxide; (c) adding mixed acid into the filtrate B, and repeating the steps a and b until aluminum ferric sulfate in the filtrate B is saturated, and then stopping circulation; (d) concentrating the filtrate B obtained after circulation is stopped, and successively carrying out cooling, crystallizing and filtering to obtain an aluminum ferric sulfate crystal; and (e) crystallizing and polymerizing the aluminum ferric sulfate to obtain the water purifying agent.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of solid waste, and relates to a method for separating and recovering titanium dioxide from metal tailings. Background technique [0002] Metal tailings refer to the remaining solid waste after the ore has been crushed, ground and smelted to obtain "useful components" concentrates under specific economic and technical conditions, and most of the metal tailings contain various colored, black, rare Valuable components such as precious and non-metallic minerals, the grade of titanium dioxide in some metal tailings is much higher than the industrial grade, in the case of the gradual depletion of titanium resources such as ilmenite, rutile and vanadium-titanium magnetite, metal tailings Mine has become one of the important sources of titanium dioxide recovery. [0003] At present, the methods for recovering titanium dioxide from metal tailings mainly include magnetic separation, magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047C01G49/14C02F1/52
CPCC01G23/0475C01G49/14C02F1/5245C01P2002/80C01P2004/03C01P2006/80
Inventor 潘爱芳马润勇马昱昭胡神涛李奎梦孙悦畅捷杨玲段玉宇
Owner 陕西省地质调查实验中心
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