Recycling method of titanium slag electric furnace fly ash

Abstract

The invention discloses a method for recycling titanium slag electric furnace dedusting ash, which comprises the following steps of: drying wet titanium concentrate and electric furnace dedusting ash in a rotary kiln according to a ratio to obtain a mixture; and the mixture and a reducing agent are jointly added into an electric furnace to be smelted, and the titanium raw material product needed for fused salt chlorination is obtained. By means of the method, recycling of the titanium slag electric furnace dedusting ash can be achieved, the titanium yield can be greatly increased, the production cost is remarkably reduced, and considerable economic benefits are created for enterprises.

Description

Technical Field

[0001] The invention relates to the technical field of titanium slag smelting production, and in particular to a method for recycling titanium slag electric furnace dust. Background Art

[0002] At present, in the process of producing titanium slag, a large titanium slag electric furnace is usually used for smelting. In the process of smelting titanium slag, the charging process is carried out from the charging hole on the electric furnace cover. The furnace cover is 4-5m high from the lower molten pool, and there is a smoke hood on the furnace cover for exhaust of the dust removal system. There are usually many fine powders in the raw materials of the titanium slag electric furnace. When charging, the fine powders are difficult to fall and float above the molten pool in the furnace. The fine powders are drawn away with the smoke generated by the reaction in the furnace, and then enter the dust removal system to be collected. A large amount of dust ash will be generated in the titanium slag electric furnace, especially when the raw materials entering the furnace contain fine powders. A large amount of fine powders will enter the dust removal system with the furnace gas, and the amount of dust ash generated will be even greater. Although the dust ash contains useful ingredients for titanium slag production, there is currently no good way to utilize it due to its low grade and fine particle size. It is usually discarded as waste in landfills in industrial parks. A large titanium slag production company will discard about 5,000-6,000 tons of dust ash each year, which not only causes a waste of resources, but also requires a garbage disposal fee of 20-30 yuan per ton.

[0003] In order to reduce the processing cost of electric furnace dust ash, the prior art discloses a method for preparing titanium concentrate pellets, which comprises: mixing titanium concentrate, liquid binder and dust ash and making pellets so that the dust ash can be reused. However, this method requires adding a large amount of liquid binder, which generally includes starch glue, sodium carboxymethyl cellulose, etc., which has an adverse effect on subsequent electric furnace smelting.

[0004] Based on this, the existing technology still needs to be improved. Summary of the invention

[0005] In order to solve the above technical problems, an embodiment of the present invention proposes a method for recycling titanium slag electric furnace dust ash to solve the technical problems existing in the existing recycling of titanium slag electric furnace dust ash.

[0006] In order to solve the above technical problems, some embodiments of the present invention disclose a method for recycling titanium slag electric furnace dust, comprising: Drying the wet titanium concentrate and the electric furnace dust in a rotary kiln according to a certain proportion to obtain a mixture; The mixed material and the reducing agent are added together into an electric furnace for smelting to obtain a titanium raw material product required for molten salt chlorination. In some embodiments, the addition ratio of the wet titanium concentrate and the electric furnace dust ash is adjusted according to raw material and product indicators.

[0007] In some embodiments, the amount of the electric furnace dust ash added is 2% to 10% of the total mass of the wet titanium concentrate and the electric furnace dust ash, calculated as a percentage by mass.

[0008] In some embodiments, when the drying process is carried out in a rotary kiln, the residence time t in the rotary kiln is s for:

[0009] Among them, t s is the residence time of the particles in the rotary kiln, n is the rotation speed of the rotary kiln, D is the diameter of the rotary kiln, and L is the length of the rotary kiln.

[0010] In some embodiments, when the drying process is carried out in a rotary kiln, the residence time t in the rotary kiln is s 2~8 minutes.

[0011] In some embodiments, when smelting is performed in an electric furnace, control of the electric furnace smelting parameters includes: a flow-pressure ratio value range of 90-130, and a current value range of 34000-40000A.

[0012] In some embodiments, when smelting is performed in an electric furnace, control of the electric furnace smelting parameters includes: a flow-pressure ratio value range of 100-110, and a current value range of 34000-36000A.

[0013] In some embodiments, the moisture content of the wet titanium concentrate is 8% to 10% by mass.

[0014] In some embodiments, the titanium dioxide content in the wet titanium concentrate is 46% to 47% by mass percentage; Alternatively, the amount of the reducing agent added is 10% to 12% of the amount of the mixture and the reducing agent added, calculated by mass ratio.

[0015] In some embodiments, the titanium raw material product required for molten salt chlorination includes titanium dioxide and iron oxide; Among them, in terms of mass percentage, carbon dioxide is 74-76% and iron oxide is 8-10%.

[0016] By adopting the above technical solution, the present invention has at least the following beneficial effects: The present invention provides a method for recycling slag electric furnace dust, which can not only realize the reuse of titanium slag electric furnace dust, but also greatly improve the titanium yield, significantly reduce production costs, and create considerable economic benefits for the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 The present invention is a flowchart of a method for recycling slag electric furnace dust according to some embodiments of the present invention. DETAILED DESCRIPTION

[0019] The following is a further detailed description of the embodiments of the present disclosure in conjunction with the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to exemplarily illustrate the principles of the present disclosure, but cannot be used to limit the scope of the present disclosure. The present disclosure can be implemented in many different forms and is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

[0020] The present disclosure provides these embodiments to make the present disclosure thorough and complete, and to fully express the scope of the present disclosure to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary, and not as limiting.

[0021] It should be noted that, in the description of the present disclosure, unless otherwise specified, the meaning of "multiple" is greater than or equal to two; the terms "upper", "lower", "left", "right", "inner", "outer", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present disclosure. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0022] In addition, the words "first", "second" and similar words used in the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different parts. "Vertical" does not mean vertical in the strict sense, but is within the tolerance range. "Parallel" does not mean parallel in the strict sense, but is within the tolerance range. "Include" or "comprising" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0023] It should also be noted that in the description of the present disclosure, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present disclosure can be understood according to the specific circumstances. When a specific device is described as being located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device.

[0024] All terms used in the present disclosure have the same meanings as those understood by those of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It should also be understood that terms defined in general dictionaries, for example, should be interpreted as having meanings consistent with their meanings in the context of the relevant technology, and should not be interpreted in an idealized or extremely formal sense, unless explicitly defined as such herein.

[0025] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0026] like Figure 1 As described above, some embodiments of the present invention disclose a method for recycling titanium slag electric furnace dust, comprising: Drying the wet titanium concentrate and the electric furnace dust in a rotary kiln according to a certain proportion to obtain a mixture; The mixed material and the reducing agent are added together into an electric furnace for smelting to obtain a titanium raw material product required for molten salt chlorination. In this embodiment, the composition of titanium slag electric furnace dust removal ash is completely consistent with that of titanium concentrate, and no other new impurity elements are added. Therefore, adding a certain amount of dust removal ash during the smelting of titanium slag will not affect the product quality. The adverse consequences of adding more liquid binders in the prior art are effectively avoided. At the same time, the addition of titanium slag electric furnace dust removal ash also effectively reduces the conductivity of titanium slag, which is conducive to improving the efficiency of electric furnace smelting.

[0027] Some embodiments of the present invention disclose a method for recycling titanium slag electric furnace dust ash. On the basis of the above embodiments, the addition ratio of the wet titanium concentrate and the electric furnace dust ash can be adjusted according to the raw material and product indicators. By adjusting the addition ratio of the electric furnace dust ash and the rotary kiln operating parameters, etc., the particle size and moisture content of the raw materials entering the furnace suitable for titanium slag smelting can be finally achieved. Specifically, in terms of mass percentage, the amount of the electric furnace dust ash added can be 2% to 10% of the total mass of the wet titanium concentrate and the electric furnace dust ash. During the drying process in the rotary kiln, in order to ensure that the raw materials entering the furnace meet the requirements of particle size and moisture content, their residence time t in the rotary kiln is s for:

[0028] Among them, t s is the residence time of the particles in the rotary kiln, n is the rotation speed of the rotary kiln, D is the diameter of the rotary kiln, and L is the length of the rotary kiln.

[0029] When the rotary kiln is dried, in order to obtain the particle size suitable for titanium slag smelting and the moisture requirements of the raw materials entering the furnace, the moisture content of the wet titanium concentrate is 8% to 10%, and the content of titanium dioxide is 46% to 47% by weight percentage; When added into an electric furnace for smelting, the amount of the reducing agent added is 10% to 12% of the amount of the mixed material and the reducing agent added, calculated by mass ratio.

[0030] Generally, when drying in a rotary kiln, the residence time in the rotary kiln is t s The time required for the smelting process is 2 to 8 minutes. In addition, by adjusting various smelting operation parameters, a titanium raw material product suitable for molten salt chlorination can be obtained. The addition of electric furnace dust can greatly increase the yield of titanium and significantly reduce production costs, and has a certain prospect for promotion and application.

[0031] A method for recycling titanium slag electric furnace dust removal ash disclosed in some embodiments of the present invention, on the basis of the above embodiments, when smelting in an electric furnace, the control of the electric furnace smelting parameters may include: the flow pressure ratio range is 90~130, and the current value range is 34000~40000A. In a preferred embodiment, the flow pressure ratio range is 100~110, and the current value range is 34000~36000A. The titanium raw material product required for molten salt chlorination includes titanium dioxide and iron oxide; wherein, in terms of mass percentage, carbon dioxide is 74~76%, and iron oxide is 8-10%.

[0032] Example 1 This embodiment discloses a method for recycling titanium slag electric furnace dust, wherein wet titanium concentrate and electric furnace dust are dried in a rotary kiln in proportion to obtain a mixture; wherein, in terms of mass percentage, the moisture content of the wet titanium concentrate is 8.5%, and the content of titanium dioxide is 46.65%. The amount of electric furnace dust added is 5% of the total mass of the wet titanium concentrate and the electric furnace dust. The residence time in the rotary kiln is t s Adjust according to the rotation speed, diameter and length of the rotary kiln, which can be calculated by the following formula:

[0033] Among them, t s is the residence time of the particles in the rotary kiln, n is the rotation speed of the rotary kiln, D is the diameter of the rotary kiln, and L is the length of the rotary kiln.

[0034] In this embodiment, the residence time in the rotary kiln is 5 minutes. The obtained titanium slag has the required particle size + 200 mesh ratio> 80% and the moisture content of the raw materials entering the furnace is < 1%.

[0035] Then, the mixture and the reducing agent are added to the electric furnace for smelting. In terms of mass ratio, the amount of the reducing agent added is 11% of the amount of the mixture and the reducing agent added. When smelting in the electric furnace, the flow pressure ratio is set to 110 and the current value is set to 35000 A for the control of the electric furnace smelting parameters. The mass content of carbon dioxide in the titanium raw material product required for molten salt chlorination is 75.03%, and the mass content of iron oxide is 8.63%.

[0036] Example 2 This embodiment discloses a method for recycling titanium slag electric furnace dust, wherein wet titanium concentrate and electric furnace dust are dried in a rotary kiln in proportion to obtain a mixture; wherein, in terms of mass percentage, the moisture content of the wet titanium concentrate is 8%, and the content of titanium dioxide is 47%. The amount of electric furnace dust added is 2% of the total mass of the wet titanium concentrate and the electric furnace dust. The residence time in the rotary kiln is t s Adjust according to the rotation speed, diameter and length of the rotary kiln, which can be calculated by the following formula:

[0037] Among them, t s is the residence time of the particles in the rotary kiln, n is the rotation speed of the rotary kiln, D is the diameter of the rotary kiln, and L is the length of the rotary kiln.

[0038] In this embodiment, the residence time in the rotary kiln is 2.5 minutes. The obtained titanium slag has the required particle size + 200 mesh ratio> 80% and the moisture content of the raw materials entering the furnace is < 1%.

[0039] Then, the mixture and the reducing agent are added to the electric furnace for smelting. In terms of mass ratio, the amount of the reducing agent added is 12% of the amount of the mixture and the reducing agent added. When smelting in the electric furnace, the flow pressure ratio is set to 90 and the current value is set to 40000 A for the control of the electric furnace smelting parameters. The mass content of carbon dioxide in the titanium raw material product required for molten salt chlorination is 75.8%, and the mass content of iron oxide is 8.2%.

[0040] Example 3 This embodiment discloses a method for recycling titanium slag electric furnace dust, wherein wet titanium concentrate and electric furnace dust are dried in a rotary kiln in proportion to obtain a mixture; wherein, in terms of mass percentage, the moisture content of the wet titanium concentrate is 10%, and the content of titanium dioxide is 46%. The amount of electric furnace dust added is 10% of the total mass of the wet titanium concentrate and the electric furnace dust. The residence time in the rotary kiln is t s Adjust according to the rotation speed, diameter and length of the rotary kiln, which can be calculated by the following formula:

[0041] Among them, t s is the residence time of the particles in the rotary kiln, n is the rotation speed of the rotary kiln, D is the diameter of the rotary kiln, and L is the length of the rotary kiln.

[0042] In this embodiment, the residence time in the rotary kiln is 7 minutes. The obtained titanium slag has the required particle size + 200 mesh ratio> 80% and the moisture content of the raw materials entering the furnace is < 1%.

[0043] Then, the mixture and the reducing agent are added to the electric furnace for smelting. In terms of mass ratio, the amount of the reducing agent added is 12% of the amount of the mixture and the reducing agent added. When smelting in the electric furnace, the flow pressure ratio is set to 130 and the current value is set to 35000 A for the control of the electric furnace smelting parameters. The mass content of carbon dioxide in the titanium raw material product required for molten salt chlorination is 74.35%, and the mass content of iron oxide is 8.36%.

[0044] Example 4 This embodiment discloses a method for recycling titanium slag electric furnace dust, wherein wet titanium concentrate and electric furnace dust are dried in a rotary kiln in proportion to obtain a mixture; wherein, in terms of mass percentage, the moisture content of the wet titanium concentrate is 9%, and the content of titanium dioxide is 46%. The amount of electric furnace dust added is 7% of the total mass of the wet titanium concentrate and the electric furnace dust. The residence time in the rotary kiln is t s Adjust according to the rotation speed, diameter and length of the rotary kiln, which can be calculated by the following formula:

[0045] Among them, t s is the residence time of the particles in the rotary kiln, n is the rotation speed of the rotary kiln, D is the diameter of the rotary kiln, and L is the length of the rotary kiln.

[0046] In this embodiment, the residence time in the rotary kiln is 6 minutes. The obtained titanium slag has the required particle size + 200 mesh ratio> 80% and the moisture content of the raw materials entering the furnace is < 1%.

[0047] Then, the mixture and the reducing agent are added to the electric furnace for smelting. In terms of mass ratio, the amount of the reducing agent added is 11.3% of the amount of the mixture and the reducing agent added. When smelting in the electric furnace, the flow pressure ratio is set to 115 and the current value is set to 36000 A for the control of the electric furnace smelting parameters. The mass content of carbon dioxide in the titanium raw material product required for molten salt chlorination is 74.78%, and the mass content of iron oxide is 8.43%.

[0048] In summary, the recycling method of titanium slag electric furnace dust ash disclosed in the embodiment of the present invention utilizes the certain adhesiveness of titanium slag electric furnace dust ash, adds the wet titanium concentrate and the electric furnace dust ash into the rotary kiln in a certain proportion for drying, and adjusts the parameters such as the proportion of electric furnace dust ash and the residence time of particles in the rotary kiln, so as to finally achieve the particle size and moisture requirements of the raw materials entering the furnace suitable for titanium slag smelting; the addition of dust ash can reduce the conductivity of titanium slag, which is beneficial to improving the efficiency of electric furnace smelting, and then the mixture formed by mixing titanium concentrate and dust ash is added to the electric furnace with a reducing agent in a certain proportion for smelting, and the titanium raw material product suitable for molten salt chlorination is finally obtained by adjusting the various operating parameters of electric furnace smelting. It can greatly improve the yield of titanium, significantly reduce production costs, and create considerable economic benefits for enterprises.

[0049] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0050] Although some specific embodiments of the present disclosure have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present disclosure. It should be understood by those skilled in the art that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present disclosure. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A method for recycling titanium slag electric furnace dust, characterized in that: include: Drying the wet titanium concentrate and the electric furnace dust in a rotary kiln according to a certain proportion to obtain a mixture; The mixed material and the reducing agent are added together into an electric furnace for smelting to obtain a titanium raw material product required for molten salt chlorination.

2. The method for recycling titanium slag electric furnace dust according to claim 1, characterized in that: The addition ratio of the wet titanium concentrate and the electric furnace dust ash is adjusted according to raw material and product indicators.

3. The method for recycling titanium slag electric furnace dust according to claim 2, characterized in that: In terms of mass percentage, the amount of the electric furnace dust ash added is 2% to 10% of the total mass of the wet titanium concentrate and the electric furnace dust ash.

4. The method for recycling titanium slag electric furnace dust according to claim 1, characterized in that: When drying in a rotary kiln, the residence time in the rotary kiln is t s for:

5. Among them, t s is the residence time of the particles in the rotary kiln, n is the rotation speed of the rotary kiln, D is the diameter of the rotary kiln, and L is the length of the rotary kiln.

6. The method for recycling titanium slag electric furnace dust according to claim 1, characterized in that: When drying in a rotary kiln, the residence time in the rotary kiln is t s 2~8 minutes.

7. The method for recycling titanium slag electric furnace dust according to claim 1, characterized in that: When smelting in an electric furnace, the control of the electric furnace smelting parameters includes: the flow-pressure ratio ranges from 90 to 130, and the current value ranges from 34000 to 40000A.

8. The method for recycling titanium slag electric furnace dust according to claim 6, characterized in that: When smelting in an electric furnace, the control of the electric furnace smelting parameters includes: the flow-pressure ratio ranges from 100 to 110, and the current value ranges from 34000 to 36000A.

9. The method for recycling titanium slag electric furnace dust according to claim 1, characterized in that: Calculated by mass percentage, the moisture content of the wet titanium concentrate is 8% to 10%.

10. The method for recycling titanium slag electric furnace dust according to claim 1, characterized in that: In terms of mass percentage, the titanium dioxide content in the wet ilmenite concentrate is 46% to 47%; Alternatively, the amount of the reducing agent added is 10% to 12% of the amount of the mixture and the reducing agent added, calculated by mass ratio.

11. The method for recycling titanium slag electric furnace dust according to claim 1, characterized in that: Titanium raw materials products required for molten salt chlorination include titanium dioxide and iron oxide; Among them, in terms of mass percentage, carbon dioxide is 74-76% and iron oxide is 8-10%.

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