Method for selectively enriching titanium element in titanium-containing molten slag

Abstract

The invention discloses a method for selectively enriching a titanium element in titanium-containing molten slag, which comprises the following steps of: 1, putting the titanium molten slag and a B2O3-ZrO2 modifier in a weight ratio of 49: 1 into a corundum crucible, putting the corundum crucible into a high-temperature tubular heating furnace, and heating to 1500 DEG C; 2, heat preservation is conducted for 1 h; 3, cooling to room temperature along with the furnace and taking out; step 4, taking out the cooled lumps, and crushing and grinding the lumps; step 5, sieving the ground powder with a 200-mesh sieve; and 6, powder with the particle size smaller than 200 meshes is collected. The process is simplified, and it can be guaranteed that the titanium element enrichment effect is good.

Description

Technical Field

[0001] The invention relates to a method for selective enrichment of elements, in particular to a method for selective enrichment of titanium elements in titanium-containing molten slag. Background Art

[0002] Titanium resources mainly exist in the form of ilmenite (FeTiO3) and rutile (TiO2), of which ilmenite reserves account for 94wt%. However, more than half of the titanium in ilmenite enters the titanium-containing molten slag after smelting in the blast furnace. Since titanium is dispersed in the titanium-containing molten slag, the intergrowth state between minerals is common, and the titanium-containing minerals have high melting points and fine particle sizes, it is difficult to extract titanium from the titanium-containing molten slag, and progress is very slow.

[0003] At present, the methods for extracting titanium from titanium-containing molten slag include acid leaching molten salt decomposition and carbonization-chlorination method: when concentrated sulfuric acid is used as the leaching agent for acid leaching to extract titanium, not only is the acid consumption large, the environmental pollution is serious, and the subsequent treatment is complicated. The molten salt decomposition method has high production costs and high process energy consumption; although the carbonization-chlorination method can be converted into TiCl after chlorination treatment, the high-standard equipment anti-corrosion and sealing requirements limit its wide application.

[0004] Although the existing technologies have their own advantages, they also have technical defects such as complex process, high production cost, large consumption of chemical reagents, titanium recovery rate needs to be improved, and the processing capacity of titanium-containing molten slag is limited. Summary of the invention

[0005] The present invention aims to provide a method for selectively enriching titanium element in titanium-containing molten slag, so as to simplify the process and ensure a better enrichment effect of titanium components.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for selectively enriching titanium element in titanium-containing molten slag, comprising the following steps:

[0007] Step 1: Place titanium molten slag and B2O3-ZrO2 modifier in a weight ratio of 49:1 in a corundum crucible, and place the corundum crucible in a high-temperature tubular heating furnace and heat it to 1500°C;

[0008] Step 2: Keep warm for 1h;

[0009] Step 3: Cool down to room temperature and take out from the furnace;

[0010] Step 4: Take out the cooled block and crush and grind it;

[0011] Step 5: Pass the ground powder through a 200-mesh sieve;

[0012] Step 6: Collect powder with particle size less than 200 mesh.

[0013] Preferably, the weight ratio of B2O3 and ZrO2 in the B2O3-ZrO2 modifier is 1:1 to 1:3.

[0014] Preferably, in step 1, the heating program is 25°C to 1400°C at a heating rate of 10°C / min; and 1400°C to 1500°C at a heating rate of 5°C / min.

[0015] The principle and beneficial effects of this technical solution:

[0016] (1) The "high-temperature modification-selective precipitation-targeted separation" process is used to achieve deep enrichment and extraction of titanium in molten titanium slag. By adding B2O3-ZrO2, the components of the titanium-containing molten slag are reconstructed to achieve the enrichment of titanium in a specific phase, thereby achieving the directional precipitation of the enriched phase.

[0017] (2) B2O3-ZrO2 was selected as a modifier, B2O3 was used to assist melting, and ZrO2 was used to promote crystallization. An experiment was conducted to modify the high-titanium vanadium-titanium magnetite electric furnace slag. After the titanium-containing phase of the high-titanium vanadium-titanium magnetite electric furnace slag was dissociated, TiO2 ≥ 75%, and the titanium component recovery rate was ≥ 50% during the titanium extraction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart of a method for selectively enriching titanium element in titanium-containing molten slag.

[0019] Figure 2 XRD diagram of the sample with a B2O3 and ZrO2 ratio of 1:1 provided in Example 1 of the present invention;

[0020] Figure 3 This is a SEM image of a sample with a B2O3 and ZrO2 ratio of 1:1 provided in Example 1 of the present invention;

[0021] Figure 4 XRD diagram of the sample with a B2O3 and ZrO2 ratio of 1:2 provided in Example 2 of the present invention;

[0022] Figure 5 The SEM image of the sample with a B2O3 and ZrO2 ratio of 1:2 provided in Example 2 of the present invention;

[0023] Figure 6 XRD diagram of the sample with a B2O3 and ZrO2 ratio of 1:3 provided in Example 3 of the present invention;

[0024] Figure 7 This is an SEM image of a sample in which B2O3 and ZrO2 have a ratio of 1:3, as provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the accompanying drawings and embodiments:

[0026] like Figure 1 As shown, a method for selectively enriching titanium element in titanium-containing molten slag comprises the following steps:

[0027] Step 1: Place titanium molten slag and B2O3-ZrO2 modifier in a weight ratio of 49:1 in a corundum crucible, place the corundum crucible in a high-temperature tubular heating furnace and heat it to 1500°C. The heating program is 25°C to 1400°C at a heating rate of 10°C / min; 1400°C to 1500°C at a heating rate of 5°C / min;

[0028] Step 2: Keep warm for 1h;

[0029] Step 3: Cool down to room temperature and take out from the furnace;

[0030] Step 4: Take out the cooled block and crush and grind it;

[0031] Step 5: Pass the ground powder through a 200-mesh sieve;

[0032] Step 6: Collect powder with particle size less than 200 mesh.

[0033] This is further described by way of examples.

[0034] Random titanium-containing molten slag is selected as a raw material to implement the present invention, and its composition is shown in Table 1:

[0035] Table 1 Main components of titanium-containing molten slag (wt%)

[0036]

[0037] Embodiment 1:

[0038] Take 98g of the above-mentioned titanium-containing molten slag and 2g of B2O3-ZrO2 modifier, in which the ratio of B2O3 and ZrO2 is 1:1, and selectively enrich them by the above-mentioned method. The powder obtained in step six is ​​sent for XRD and SEM-EDS inspection. After testing, the titanium ore phase content is 40.15%, of which the rutile (TiO2) content is 4.71%, and the pseudobrookite (FeTi2O5) content is 35.44%.

[0039] Embodiment 2:

[0040] Take 98g of the above-mentioned titanium-containing molten slag and 2g of B2O3-ZrO2 modifier, in which the ratio of B2O3 and ZrO2 is 1:2, and selectively enrich them by the above-mentioned method. The powder obtained in step six is ​​sent for XRD and SEM-EDS inspection. After testing, the titanium ore phase content is 39.17%, of which the rutile (TiO2) content is 1.09%, and the pseudobrookite (FeTi2O5) content is 38.08%.

[0041] Embodiment 3:

[0042] Take 98g of the above-mentioned titanium-containing molten slag and 2g of B2O3-ZrO2 modifier, in which the ratio of B2O3 and ZrO2 is 1:3, and selectively enrich them by the above-mentioned method. The powder obtained in step six is ​​sent for XRD and SEM-EDS testing. After testing, the titanium ore phase content is 34.92%, of which the rutile (TiO2) content is 2.68%, and the pseudobrookite (FeTi2O5) content is 32.24%.

[0043] In summary, the B2O3-ZrO2 modifier has the best effect when the ratio of B2O3 to ZrO2 is approximately 1:1. Through this method, the Ti element in the titanium-containing molten slag is selectively enriched in the form of rutile (TiO2) and tialite (FeTi2O5).

[0044] The above is only an embodiment of the present invention, and the common knowledge such as the known specific technical solutions or characteristics in the solution is not described in detail here. For those skilled in the art, without departing from the technical solution of the present invention, several modifications and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A method for selectively enriching titanium from titanium-containing molten slag, characterized in that: The following steps are involved: Step 1: Place titanium molten slag and B2O3-ZrO2 modifier in a weight ratio of 49:1 in a corundum crucible, and place the corundum crucible in a high-temperature tubular heating furnace and heat it to 1500°C; Step 2: Keep warm for 1h; Step 3: Cool down to room temperature and take out from the furnace; Step 4: Take out the cooled block and crush and grind it; Step 5: Pass the ground powder through a 200-mesh sieve; Step 6: Collect powder with particle size less than 200 mesh.

2. The method for selectively enriching, growing and separating titanium in titanium-containing molten slag according to claim 1, characterized in that: The weight ratio of B2O3 and ZrO2 in the B2O3-ZrO2 modifier is 1:1 to 1:

3.

3. The selective enrichment, growth and separation method of titanium element in titanium-containing molten slag according to claim 1, characterized in that: In step 1, the heating program is 25°C to 1400°C at a heating rate of 10°C / min; and 1400°C to 1500°C at a heating rate of 5°C / min.

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