Method for preparing high-activity slag micro-powder from titanium extraction tailings

Abstract

The application discloses a method for preparing high-activity slag micro-powder from titanium extraction tailings, and relates to the technical field of slag recovery and treatment, which comprises the following steps: step S10, performing primary dechlorination treatment on the titanium extraction tailings to obtain the primary-washed titanium extraction tailings; step S20, performing primary fine grinding treatment on the primary-washed titanium extraction tailings, filtering the titanium extraction tailings after the primary fine grinding treatment, and performing secondary washing treatment to obtain semi-dry materials, wherein the weight content of chlorine in the semi-dry materials is less than 0.15%; and step S30, adding 2-5% of green vitriol by weight of the semi-dry materials into the semi-dry materials and mixing to obtain a mixture, and then performing secondary dechlorination treatment and secondary fine grinding treatment on the mixture by using a high-temperature steam dechlorination process to obtain the high-activity slag micro-powder. The application reasonably controls the chlorine content in the semi-dry materials and solves the problem that the prior art cannot prepare the high-activity slag micro-powder from the titanium extraction tailings by using the high-temperature steam dechlorination process.

Description

Technical Field

[0001] This invention relates to the field of slag recycling and treatment technology, specifically a method for preparing highly active slag powder from titanium tailings. Background Technology

[0002] Slag is a byproduct of the blast furnace ironmaking process. During ironmaking, iron oxide is reduced to metallic iron at high temperatures. Impurities such as silica and alumina in the iron ore react with lime and other materials to form a molten material mainly composed of silicates and aluminosilicates. After quenching, it becomes a loose, porous granular material, which is blast furnace slag, or slag for short.

[0003] Existing technologies cannot provide a method for preparing slag powder from titanium extraction tailings, resulting in the ineffective utilization of titanium extraction tailings. Therefore, it is necessary to propose a method for preparing highly active slag powder from titanium extraction tailings to solve this technical problem. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing highly active slag powder from titanium tailings, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for preparing highly active slag powder from titanium extraction tailings includes the following steps:

[0007] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0008] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0009] Step S30: Add 2-5% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination process and a second grinding process using a high-temperature steam dechlorination process to obtain highly active slag powder.

[0010] As a further embodiment of the present invention, the method for preparing highly active slag powder from titanium tailings includes the following steps:

[0011] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0012] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0013] Step S30: Add 3-4% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

[0014] As a further embodiment of the present invention, the method for preparing highly active slag powder from titanium tailings includes the following steps:

[0015] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0016] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0017] Step S30: Add 3.5% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

[0018] As a further aspect of the present invention, the primary dechlorination treatment employs a water washing coarse dechlorination process.

[0019] As a further aspect of the present invention: the chlorine content in the initial washing of titanium extraction tailings is less than 0.4% by weight.

[0020] As a further aspect of the present invention, the primary grinding process employs a ball milling and water washing dechlorination process.

[0021] As a further embodiment of the present invention: the titanium extraction tailings after initial washing undergo a first grinding process, and the titanium extraction tailings after the first grinding process are then filtered and washed a second time to obtain a semi-dry material, comprising:

[0022] The titanium extraction tailings after initial washing are subjected to a first grinding process, and then the titanium extraction tailings after the first grinding process are subjected to vacuum filtration and a second washing process to obtain semi-dry material; wherein, the particle size of the titanium extraction tailings after the first grinding process is ≤0.045mm.

[0023] As a further aspect of the present invention: the secondary dechlorination treatment uses high-temperature steam at a temperature of 250°C or higher for dechlorination.

[0024] As a further aspect of the present invention, the secondary grinding process employs a particle collision treatment method.

[0025] Compared with existing technologies, the beneficial effects of this invention are as follows: By performing a primary dechlorination treatment on titanium extraction tailings to obtain pre-washed titanium extraction tailings, and then performing a primary grinding treatment on the pre-washed tailings, followed by filtration and a secondary washing treatment, a semi-dry material is obtained. 2-5% (by weight) of ferrous sulfate is added to the semi-dry material and mixed to obtain a mixture. This mixture is then subjected to a secondary dechlorination and secondary grinding treatment to obtain highly active slag powder. This invention, through a primary dechlorination and grinding treatment of titanium extraction tailings, followed by filtration and secondary washing, and then the addition of ferrous sulfate for mixing, secondary dechlorination, and secondary grinding, can produce highly active slag powder, solving the problem that existing technologies cannot utilize titanium extraction tailings to prepare highly active slag powder. The two dechlorination treatments effectively dechlorinate the tailings, and the two grinding treatments effectively ensure the particle size of the slag powder. Detailed Implementation

[0026] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0027] This invention provides a method for preparing highly active slag powder from titanium extraction tailings. The method includes the following steps:

[0028] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0029] In this embodiment of the invention, the primary dechlorination treatment employs a water washing coarse dechlorination process.

[0030] Specifically, the chlorine content in the initial titanium extraction tailings is less than 0.4% by weight.

[0031] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0032] In this embodiment of the invention, the primary grinding process employs a ball milling and water washing dechlorination process.

[0033] In this embodiment of the invention, the process of first grinding the initially washed titanium extraction tailings, followed by filtration and second washing of the tailings after the first grinding to obtain semi-dry material includes:

[0034] The titanium extraction tailings after initial washing are subjected to a first grinding process, and then the titanium extraction tailings after the first grinding process are subjected to vacuum filtration and a second washing process to obtain semi-dry material; wherein, the particle size of the titanium extraction tailings after the first grinding process is ≤0.045mm.

[0035] In this embodiment of the invention, the chlorine content in the semi-dry material is less than 0.15% by weight.

[0036] Step S30: Add 2-5% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

[0037] In this embodiment of the invention, the secondary dechlorination treatment employs a high-temperature steam dechlorination process. The high-temperature steam temperature is above 250°C. The high-temperature steam carries the material into the reactor, where high-speed collisions break and mix the material. Chlorine-containing substances in the titanium tailings react directly with the high-temperature steam, forming hydrogen chloride gas that escapes, achieving deep dechlorination through high-temperature steam treatment. The chlorine content in the dechlorinated tailings is below 0.06%, meeting the application requirements of the cement and concrete industries. Thermodynamic and kinetic calculations show that chloride salts such as calcium chloride and magnesium chloride in the tailings can react with high-temperature steam to form calcium hydroxide, magnesium hydroxide, and hydrogen chloride. The initial operating temperature is 250°C; the higher the temperature, the faster the reaction rate.

[0038] In this embodiment of the invention, the secondary grinding process employs a particle collision treatment method.

[0039] It should be noted that dust removal is required during the secondary grinding process to prevent dust from escaping and to protect the environment.

[0040] It should be noted that ferrous sulfate heptahydrate is ferrous sulfate.

[0041] This invention involves a primary dechlorination treatment of titanium extraction tailings to obtain pre-washed tailings, followed by a primary grinding of the pre-washed tailings. Simultaneously, the tailings after primary grinding undergo filtration and a secondary washing to obtain semi-dry material. 2-5% (by weight) of ferrous sulfate is added to the semi-dry material and mixed to obtain a mixture. This mixture then undergoes a second dechlorination and secondary grinding treatment to obtain highly active slag powder. This invention, through a primary dechlorination and grinding process followed by filtration and secondary washing, and then the addition of ferrous sulfate for mixing, secondary dechlorination, and secondary grinding, can produce highly active slag powder, solving the problem of existing technologies being unable to utilize titanium extraction tailings to prepare such powder. The two dechlorination processes effectively dechlorinate the tailings, and the two grinding processes effectively ensure the particle size of the slag powder.

[0042] Example 1

[0043] A method for preparing highly active slag powder from titanium extraction tailings includes the following steps:

[0044] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0045] In this embodiment of the invention, the primary dechlorination treatment employs a water washing coarse dechlorination process.

[0046] Specifically, the chlorine content in the initial titanium extraction tailings is less than 0.4% by weight.

[0047] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0048] In this embodiment of the invention, the primary grinding process employs a ball milling and water washing dechlorination process.

[0049] In this embodiment of the invention, the process of first grinding the initially washed titanium extraction tailings, followed by filtration and second washing of the tailings after the first grinding to obtain semi-dry material includes:

[0050] The titanium extraction tailings after initial washing are subjected to a first grinding process, and then the titanium extraction tailings after the first grinding process are subjected to vacuum filtration and a second washing process to obtain semi-dry material; wherein, the particle size of the titanium extraction tailings after the first grinding process is ≤0.045mm.

[0051] In this embodiment of the invention, the chlorine content in the semi-dry material is less than 0.15% by weight.

[0052] Step S30: Add 5% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

[0053] In this embodiment of the invention, the secondary dechlorination treatment employs a high-temperature steam dechlorination process.

[0054] Furthermore, the chlorine content by weight in the semi-dry material after secondary dechlorination is less than 0.06%.

[0055] In this embodiment of the invention, the secondary grinding process employs a particle collision treatment method.

[0056] Example 2

[0057] A method for preparing highly active slag powder from titanium extraction tailings includes the following steps:

[0058] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0059] In this embodiment of the invention, the primary dechlorination treatment employs a water washing coarse dechlorination process.

[0060] Specifically, the chlorine content in the initial titanium extraction tailings is less than 0.4% by weight.

[0061] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0062] In this embodiment of the invention, the primary grinding process employs a ball milling and water washing dechlorination process.

[0063] In this embodiment of the invention, the process of first grinding the initially washed titanium extraction tailings, followed by filtration and second washing of the tailings after the first grinding to obtain semi-dry material includes:

[0064] The titanium extraction tailings after initial washing are subjected to a first grinding process, and then the titanium extraction tailings after the first grinding process are subjected to vacuum filtration and a second washing process to obtain semi-dry material; wherein, the particle size of the titanium extraction tailings after the first grinding process is ≤0.045mm.

[0065] In this embodiment of the invention, the chlorine content in the semi-dry material is less than 0.15% by weight.

[0066] Step S30: Add 2% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

[0067] In this embodiment of the invention, the secondary dechlorination treatment employs a high-temperature steam dechlorination process.

[0068] Furthermore, the chlorine content by weight in the semi-dry material after secondary dechlorination is less than 0.06%.

[0069] In this embodiment of the invention, the secondary grinding process employs a particle collision treatment method.

[0070] Example 3

[0071] A method for preparing highly active slag powder from titanium extraction tailings includes the following steps:

[0072] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0073] In this embodiment of the invention, the primary dechlorination treatment employs a water washing coarse dechlorination process.

[0074] Specifically, the chlorine content in the initial titanium extraction tailings is less than 0.4% by weight.

[0075] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0076] In this embodiment of the invention, the primary grinding process employs a ball milling and water washing dechlorination process.

[0077] In this embodiment of the invention, the process of first grinding the initially washed titanium extraction tailings, followed by filtration and second washing of the tailings after the first grinding to obtain semi-dry material includes:

[0078] The titanium extraction tailings after initial washing are subjected to a first grinding process, and then the titanium extraction tailings after the first grinding process are subjected to vacuum filtration and a second washing process to obtain semi-dry material; wherein, the particle size of the titanium extraction tailings after the first grinding process is ≤0.045mm.

[0079] In this embodiment of the invention, the chlorine content in the semi-dry material is less than 0.15% by weight.

[0080] Step S30: Add 3% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

[0081] In this embodiment of the invention, the secondary dechlorination treatment employs a high-temperature steam dechlorination process.

[0082] Furthermore, the chlorine content by weight in the semi-dry material after secondary dechlorination is less than 0.06%.

[0083] In this embodiment of the invention, the secondary grinding process employs a particle collision treatment method.

[0084] Example 4

[0085] A method for preparing highly active slag powder from titanium extraction tailings includes the following steps:

[0086] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0087] In this embodiment of the invention, the primary dechlorination treatment employs a water washing coarse dechlorination process.

[0088] Specifically, the chlorine content in the initial titanium extraction tailings is less than 0.4% by weight.

[0089] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0090] In this embodiment of the invention, the primary grinding process employs a ball milling and water washing dechlorination process.

[0091] In this embodiment of the invention, the process of first grinding the initially washed titanium extraction tailings, followed by filtration and second washing of the tailings after the first grinding to obtain semi-dry material includes:

[0092] The titanium extraction tailings after initial washing are subjected to a first grinding process, and then the titanium extraction tailings after the first grinding process are subjected to vacuum filtration and a second washing process to obtain semi-dry material; wherein, the particle size of the titanium extraction tailings after the first grinding process is ≤0.045mm.

[0093] In this embodiment of the invention, the chlorine content in the semi-dry material is less than 0.15% by weight.

[0094] Step S30: Add 4% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

[0095] In this embodiment of the invention, the secondary dechlorination treatment employs a high-temperature steam dechlorination process.

[0096] Furthermore, the chlorine content by weight in the semi-dry material after secondary dechlorination is less than 0.06%.

[0097] In this embodiment of the invention, the secondary grinding process employs a particle collision treatment method.

[0098] Example 5

[0099] A method for preparing highly active slag powder from titanium extraction tailings includes the following steps:

[0100] Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings.

[0101] In this embodiment of the invention, the primary dechlorination treatment employs a water washing coarse dechlorination process.

[0102] Specifically, the chlorine content in the initial titanium extraction tailings is less than 0.4% by weight.

[0103] Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material.

[0104] In this embodiment of the invention, the primary grinding process employs a ball milling and water washing dechlorination process.

[0105] In this embodiment of the invention, the process of first grinding the initially washed titanium extraction tailings, followed by filtration and second washing of the tailings after the first grinding to obtain semi-dry material includes:

[0106] The titanium extraction tailings after initial washing are subjected to a first grinding process, and then the titanium extraction tailings after the first grinding process are subjected to vacuum filtration and a second washing process to obtain semi-dry material; wherein, the particle size of the titanium extraction tailings after the first grinding process is ≤0.045mm.

[0107] In this embodiment of the invention, the chlorine content in the semi-dry material is less than 0.15% by weight.

[0108] Step S30: Add 3.5% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

[0109] In this embodiment of the invention, the secondary dechlorination treatment employs a high-temperature steam dechlorination process.

[0110] Furthermore, the chlorine content by weight in the semi-dry material after secondary dechlorination is less than 0.06%.

[0111] In this embodiment of the invention, the secondary grinding process employs a particle collision treatment method.

[0112] It should be noted that, based on the current scale of infrastructure construction in the Panzhihua area, the annual consumption of silicate cement reaches 3.2 million tons, and the consumption of commercial concrete reaches 2.8 million cubic meters. 3 It is estimated that the consumption of highly active slag powder can reach 1 million tons. Currently, highly active slag powder mainly relies on external imports, and the local slag powder resources, including fly ash, yellow phosphorus slag, and steel slag, have been decreasing year by year, resulting in low quality. Therefore, the slag powder produced using this technology has a promising market prospect. This invention can support the construction of a 100,000-ton-level blast furnace slag titanium extraction production line, enabling the pretreatment and resource utilization of 100,000-ton-level titanium extraction tailings. The resulting slag powder has a promising market prospect in the region, with significant economic benefits.

[0113] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A method for preparing highly active slag powder from titanium tailings, characterized in that, The method for preparing highly active slag powder from titanium extraction tailings includes the following steps: Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings. Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain a semi-dry material, wherein the weight content of chlorine in the semi-dry material is less than 0.15%. Step S30: Add 2-5% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is introduced into the reactor again by high-temperature steam above 250°C, so that the chlorine-containing substances in the titanium extraction tailings react directly with the high-temperature steam to form hydrogen chloride gas, which is then released for secondary dechlorination and secondary grinding to obtain highly active slag powder.

2. The method for preparing highly active slag powder from titanium extraction tailings according to claim 1, characterized in that, The method for preparing highly active slag powder from titanium extraction tailings includes the following steps: Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings. Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material. Step S30: Add 3-4% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

3. The method for preparing highly active slag powder from titanium tailings according to claim 1, characterized in that, The method for preparing highly active slag powder from titanium extraction tailings includes the following steps: Step S10: Perform a dechlorination treatment on the titanium extraction tailings to obtain pre-washed titanium extraction tailings. Step S20: The titanium extraction tailings after initial washing are subjected to a first grinding process, and the titanium extraction tailings after the first grinding process are filtered and washed a second time to obtain semi-dry material. Step S30: Add 3.5% of the weight of ferrous sulfate to the semi-dry material and mix to obtain a mixture. Then, the mixture is subjected to a second dechlorination treatment and a second grinding treatment to obtain highly active slag powder.

4. The method for preparing highly active slag powder from titanium extraction tailings according to claim 1, characterized in that, The primary dechlorination process employs a water-washing coarse dechlorination process.

5. The method for preparing highly active slag powder from titanium extraction tailings according to claim 4, characterized in that, The chlorine content in the initial titanium extraction tailings is less than 0.4% by weight.

6. The method for preparing highly active slag powder from titanium extraction tailings according to claim 1, characterized in that, The primary grinding process employs a ball milling and water washing dechlorination process.

7. The method for preparing highly active slag powder from titanium extraction tailings according to claim 1, characterized in that, The process involves first-stage grinding of the titanium extraction tailings from the initial washing, followed by filtration and second-stage washing to obtain a semi-dry material, including: The titanium extraction tailings after initial washing are subjected to a first grinding process, and then the titanium extraction tailings after the first grinding process are subjected to vacuum filtration and a second washing process to obtain semi-dry material; wherein, the particle size of the titanium extraction tailings after the first grinding process is ≤0.045mm.

8. The method for preparing highly active slag powder from titanium tailings according to claim 1, characterized in that, The secondary grinding process employs a particle collision treatment method.