Method for preparing TiO2 raw material for chlorination process from titanium-rich fine powder

Abstract

The invention provides a method for preparing a TiO2 raw material for a chlorination process from titanium-rich fine powder. The method comprises the following steps: S1, weighing the titanium-rich fine powder, and uniformly mixing the titanium-rich fine powder with a solid organic binder and petroleum coke at room temperature; S2, uniformly covering the surface of a mixed material obtained in thestep S1 with petroleum coke, and then performing low-temperature coking at 380-420 DEG C for 2.5-4 hours; and S3, crushing the material having undergone low-temperature coking in the step S2 into particles for the first time, then carrying out high-temperature coking at 900-1200 DEG C for 20-60 minutes, and crushing a coked material into particles again so as to obtain the TiO2 raw material for the chlorination process. The method can prepare the TiO2 raw material with high yield (higher than 92%) and qualified granularity for the chlorination process and realizes the cyclic utilization of the titanium-rich fine powder; and the batching procedure of a later chlorination reaction is reduced by adding the petroleum coke in advance.

Description

technical field

[0001] The invention belongs to the technical field of preparation of titanium dioxide raw materials by chlorination method, and in particular relates to a method of preparing TiO by chlorination method by using titanium-rich fine powder. 2 raw material method. Background technique

[0002] Currently, TiO 2 There are mainly two kinds of production processes: sulfuric acid method and chlorination method. Both methods have their own advantages and disadvantages: the sulfuric acid method has mature technology, simple equipment, and low requirements on raw materials, so it is widely used, but its process flow is long, the operation is complicated and There are many three wastes produced; the chlorination method has received more and more attention due to its advantages such as advanced production technology, large production capacity, simple process, low energy consumption, and superior product performance, but it has high requirements for raw materials, and req...

Examples

Embodiment 1

[0038] 1. Take low-concentration titanium liquid and hydrolyze it to prepare titanium-rich fine powder in the production process of titanium-rich materials, add 5% solid organic binder coal tar and 6% petroleum coke, and mix evenly at room temperature;

[0039] 2. Take the above-mentioned mixed materials in the hopper, cover the surface evenly with a layer of petroleum coke, the thickness of the petroleum coke is 1.5mm, and carry out low-temperature coking at 380°C for 4 hours;

[0040] 3. The material after low-temperature coking is crushed to a qualified particle size (20-60 mesh) by a roller mill, and the crushed material is subjected to high-temperature coking at 1000°C for 50 minutes, and after re-screening, chlorine with a particle size of 20-160 mesh can be obtained. Chemical method raw material, calculated yield, reaches 92.8%.

Embodiment 2

[0042] 1. Take low-concentration titanium liquid and hydrolyze it to prepare titanium-containing fine powder in the production process of titanium-rich materials, add a certain amount of 20% solid organic binder petroleum pitch and 18% petroleum coke, and mix evenly at room temperature;

[0043] 2. Take the above-mentioned mixed materials in the hopper, cover the surface evenly with a layer of petroleum coke, the thickness of the petroleum coke is 1.2mm, and carry out low-temperature coking at 410°C for 3 hours;

[0044] 3. The material after low-temperature coking is crushed to a qualified particle size (20-60 mesh) by a double-roller mill, and the crushed material is subjected to high-temperature coking at 900°C for 60 minutes. After re-screening, chlorine with a particle size of 20-160 mesh can be obtained. Chemical method raw material, calculated yield, reaches 93.5%.

Embodiment 3

[0046] 1. Take low-concentration titanium liquid and hydrolyze it to prepare titanium-containing fine powder in the production process of titanium-rich materials, add a certain amount of 15% solid organic binder coal tar pitch and 12% petroleum coke, and mix evenly at room temperature;

[0047] 2. Take the above-mentioned mixed materials in the hopper, cover the surface evenly with a layer of petroleum coke, the thickness of the petroleum coke is 1mm, and carry out low-temperature coking at 400 ° C for 3.5 hours;

[0048] 3. The material after low-temperature coking is crushed to a qualified particle size (20-60 mesh) by a double-roll mill, and the crushed material is subjected to high-temperature coking at 1100°C for 40 minutes, and after re-screening, chlorine with a particle size of 20-160 mesh can be obtained. Chemical method raw material, calculated yield, reaches 93.7%.

technical field

[0001] The invention belongs to the technical field of preparation of titanium dioxide raw materials by chlorination method, and in particular relates to a method of preparing TiO by chlorination method by using titanium-rich fine powder. 2 raw material method. Background technique

[0002] Currently, TiO 2 There are mainly two kinds of production processes: sulfuric acid method and chlorination method. Both methods have their own advantages and disadvantages: the sulfuric acid method has mature technology, simple equipment, and low requirements on raw materials, so it is widely used, but its process flow is long, the operation is complicated and There are many three wastes produced; the chlorination method has received more and more attention due to its advantages such as advanced production technology, large production capacity, simple process, low energy consumption, and superior product performance, but it has high requirements for raw materials, and req...

Examples

Embodiment 1

[0038] 1. Take low-concentration titanium liquid and hydrolyze it to prepare titanium-rich fine powder in the production process of titanium-rich materials, add 5% solid organic binder coal tar and 6% petroleum coke, and mix evenly at room temperature;

[0039] 2. Take the above-mentioned mixed materials in the hopper, cover the surface evenly with a layer of petroleum coke, the thickness of the petroleum coke is 1.5mm, and carry out low-temperature coking at 380°C for 4 hours;

[0040] 3. The material after low-temperature coking is crushed to a qualified particle size (20-60 mesh) by a roller mill, and the crushed material is subjected to high-temperature coking at 1000°C for 50 minutes, and after re-screening, chlorine with a particle size of 20-160 mesh can be obtained. Chemical method raw material, calculated yield, reaches 92.8%.

Embodiment 2

[0042] 1. Take low-concentration titanium liquid and hydrolyze it to prepare titanium-containing fine powder in the production process of titanium-rich materials, add a certain amount of 20% solid organic binder petroleum pitch and 18% petroleum coke, and mix evenly at room temperature;

[0043] 2. Take the above-mentioned mixed materials in the hopper, cover the surface evenly with a layer of petroleum coke, the thickness of the petroleum coke is 1.2mm, and carry out low-temperature coking at 410°C for 3 hours;

[0044] 3. The material after low-temperature coking is crushed to a qualified particle size (20-60 mesh) by a double-roller mill, and the crushed material is subjected to high-temperature coking at 900°C for 60 minutes. After re-screening, chlorine with a particle size of 20-160 mesh can be obtained. Chemical method raw material, calculated yield, reaches 93.5%.

Embodiment 3

[0046] 1. Take low-concentration titanium liquid and hydrolyze it to prepare titanium-containing fine powder in the production process of titanium-rich materials, add a certain amount of 15% solid organic binder coal tar pitch and 12% petroleum coke, and mix evenly at room temperature;

[0047] 2. Take the above-mentioned mixed materials in the hopper, cover the surface evenly with a layer of petroleum coke, the thickness of the petroleum coke is 1mm, and carry out low-temperature coking at 400 ° C for 3.5 hours;

[0048] 3. The material after low-temperature coking is crushed to a qualified particle size (20-60 mesh) by a double-roll mill, and the crushed material is subjected to high-temperature coking at 1100°C for 40 minutes, and after re-screening, chlorine with a particle size of 20-160 mesh can be obtained. Chemical method raw material, calculated yield, reaches 93.7%.

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