CN111519023A - Calcium-containing titanium slag pelletizing technology utilizing calcium-based binder - Google Patents
Calcium-containing titanium slag pelletizing technology utilizing calcium-based binder Download PDFInfo
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- CN111519023A CN111519023A CN202010276870.7A CN202010276870A CN111519023A CN 111519023 A CN111519023 A CN 111519023A CN 202010276870 A CN202010276870 A CN 202010276870A CN 111519023 A CN111519023 A CN 111519023A
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- calcium
- titanium slag
- containing titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/248—Binding; Briquetting ; Granulating of metal scrap or alloys
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- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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- Mechanical Engineering (AREA)
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- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention relates to a calcium-containing titanium slag pelletizing technology using a calcium-based binding agent, which comprises the following steps: firstly, weighing 90-95 mass percent of calcium-containing titanium slag, adding 5-10 mass percent of calcium-based bonding agent into the weighed calcium-containing titanium slag, and carrying out premixing, mixing, material stewing and pelletizing to obtain Al2O3‑TiO2-CaO ternary system green pellets. The pellet containing calcium and titanium slag prepared by the method has the characteristics of large pellet binding power, low content of binder impurities, high roasting strength of the green pellet, low binder cost, no excessive gas generated in the roasting process and the like.
Description
Technical Field
The invention belongs to the technical field of comprehensive utilization of calcium-containing titanium slag, and particularly relates to a pelletizing technology of the calcium-containing titanium slag by using a calcium-based binding agent.
Background
The Chinese economy is in the high-speed development stage, and the steel yield is continuously increased. Thus, many metallurgical slags are produced during the iron and steel smelting process. The alloy smelting slag occupies land and pollutes the environment, and the industrialization and the resource utilization of the waste slag become hot spots at present.
At present, the process for producing ferrotitanium by adopting a method process is mature in China, and the process for producing ferrotitanium by adopting the method is accompanied by the generation of Al as a main phase2O3（wt.）≥72%、TiO2（wt.）≥14.5%、CaO（wt.) More than or equal to 9.5 percent of the calcium-containing titanium slag comprises the main components of phases with high refractoriness and excellent high-temperature performance, and is suitable for preparing refractory material aggregate after treatment.
However, the recycling of the calcium-containing titanium slag, the difficulty in forming the calcium-containing titanium slag in the process of preparing the aggregate, and the easy crushing problem in the sintering process due to the low normal temperature strength of the formed green pellets still need to be further improved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a low-cost and environment-friendly pelletizing technology of the calcium-containing titanium slag, and the prepared calcium-containing titanium slag green pellets have proper green pellet granularity, compressive strength and free falling body crushing height and meet the granularity and strength requirements of calcium-containing titanium slag pressed pellets for rotary kiln calcination.
In order to achieve the purpose, the invention adopts the technical scheme that:
a pelletizing technology of calcium-containing titanium slag by using a calcium-based binding agent comprises the following phases:
the method specifically comprises the following steps:
(1) adding 5-10% of calcium-based binding agent into 90-95% of calcium-containing titanium slag in percentage by mass, and placing the calcium-based binding agent and the calcium-containing titanium slag in a ball mill for premixing for 1-3 hours to obtain a mixed material with the granularity of 200 meshes;
(2) adding water accounting for 6-8% of the mass of the mixture into the mixture in percentage by mass, and continuously mixing for 10-30 minutes to obtain a calcareous cementing material;
(3) sealing and stewing the calcareous cementing material at room temperature for 30-60 minutes to obtain a stewed calcareous cementing material;
(4) starting a disc pelletizer, adding the stewed calcareous cementing material into the disc pelletizer to serve as a mother ball material, adding water which is 3-5% of the stewed calcareous cementing material into the mother ball material in a vaporific form to manufacture a mother ball, and adding water and feeding at the same time; when the diameter of the pellet is 5-8mm, stopping pumping water and feeding, and obtaining the calcium-titanium-containing slag green pellet material using the calcium-based binding agent.
The calcium-based binding agent in the step (1) can be one or a mixture of calcium oxide fine powder, calcium chloride fine powder and calcium hydroxide fine powder.
Compared with the prior art, the invention has the beneficial effects that: 1) compared with the raw ball containing the calcium-titanium slag, which is prepared without the calcium-based binding agent, the raw ball containing the calcium-titanium slag, which is prepared by adding the calcium-based binding agent, has the advantages that the compressive strength is improved by 2.5-10 percent, and the falling strength is improved by 15-20 percent; 2) compared with the raw pellets containing the calcium-titanium slag, which are prepared by adding the traditional organic matter binding agent, the raw pellets containing the calcium-titanium slag, which are prepared by adding the calcium-based binding agent, can avoid the burst of the pellets and greatly improve the safety of the production process; 3) the calcium-containing titanium slag green ball prepared by adding the calcium-based binding agent can replace the binder removal process before sintering, thereby saving the production time.
Detailed Description
The preparation process of the present invention is further illustrated by the following examples:
the physicochemical indexes of the calcareous titanium slag used in the following examples and comparative examples of the present invention are shown in the following table.
Example 1
Adding 5kg of calcium oxide fine powder into 95kg of calcium-containing titanium slag, and placing the calcium oxide fine powder and the calcium-containing titanium slag into a ball mill for premixing for 2 hours to obtain a mixed material; adding 6kg of water into the mixture, and continuously mixing for 30 minutes to obtain a calcareous cementing material; sealing and stewing the calcareous cementing material at room temperature for 60 minutes to obtain a stewed calcareous cementing material; starting a disc pelletizer, stewing a calcareous cementing material into the disc pelletizer to form a mother ball material, adding 3kg of water into the mother ball material in a mist form to manufacture a mother ball, and adding water and carrying out the steps at the same time; when the diameter of the pellet is 8mm, stopping pumping water and feeding, and obtaining the calcium-titanium-containing slag green pellet material using the calcium-based binding agent.
The compressive strength of the calcium-containing titanium slag green ball is the weight loaded when the green ball begins to crack and deform in a load test, and in order to ensure that the green ball can bear the pressure of a material column without being crushed when being roasted in a rotary kiln, the compressive strength of the prepared calcium-containing titanium slag green ball is required to be 15-20 Kg/ball generally; the falling strength of the calcium-containing titanium slag green ball is based on the crushing height of the free falling body of the green ball. The diameter of the raw ball material of the calcium-titanium-containing slag prepared by the embodiment is 8mm, the compressive strength is 16.38 Kg/ball, and the falling and crushing height is 1.54 m.
Example 2
Adding 6kg of calcium oxide fine powder into 94kg of calcium-containing titanium slag, and placing the calcium oxide fine powder and the calcium-containing titanium slag into a ball mill for premixing for 2 hours to obtain a mixed material; adding 6kg of water into the mixture, and continuously mixing for 30 minutes to obtain a calcareous cementing material; sealing and stewing the calcareous cementing material at room temperature for 60 minutes to obtain a stewed calcareous cementing material; starting a disc pelletizer, stewing a calcareous cementing material into the disc pelletizer to form a mother ball material, adding 3kg of water into the mother ball material in a mist form to manufacture a mother ball, and adding water and carrying out the steps at the same time; when the diameter of the pellet is 8mm, stopping pumping water and feeding, and obtaining the calcium-titanium-containing slag green pellet material using the calcium-based binding agent.
The compressive strength of the calcium-containing titanium slag green ball is the weight loaded when the green ball begins to crack and deform in a load test, and in order to ensure that the green ball can bear the pressure of a material column without being crushed when being roasted in a rotary kiln, the compressive strength of the prepared calcium-containing titanium slag green ball is required to be 15-20 Kg/ball generally; the falling strength of the calcium-containing titanium slag green ball is based on the crushing height of the free falling body of the green ball. The diameter of the raw ball material of the calcium-titanium-containing slag prepared by the embodiment is 8mm, the compressive strength is 17.45 Kg/ball, and the falling and crushing height is 1.66 m.
Example 3
Adding 8kg of calcium oxide fine powder into 92kg of calcium-containing titanium slag, and placing the calcium oxide fine powder and the calcium-containing titanium slag into a ball mill for premixing for 2 hours to obtain a mixed material; adding 6kg of water into the mixture, and continuously mixing for 30 minutes to obtain a calcareous cementing material; sealing and stewing the calcareous cementing material at room temperature for 60 minutes to obtain a stewed calcareous cementing material; starting a disc pelletizer, stewing a calcareous cementing material into the disc pelletizer to form a mother ball material, adding 3kg of water into the mother ball material in a mist form to manufacture a mother ball, and adding water and carrying out the steps at the same time; when the diameter of the pellet is 8mm, stopping pumping water and feeding, and obtaining the calcium-titanium-containing slag green pellet material using the calcium-based binding agent.
The compressive strength of the calcium-containing titanium slag green ball is the weight loaded when the green ball begins to crack and deform in a load test, and in order to ensure that the green ball can bear the pressure of a material column without being crushed when being roasted in a rotary kiln, the compressive strength of the prepared calcium-containing titanium slag green ball is required to be 15-20 Kg/ball generally; the falling strength of the calcium-containing titanium slag green ball is based on the crushing height of the free falling body of the green ball. The diameter of the raw ball material of the calcium-titanium-containing slag prepared by the embodiment is 8mm, the compressive strength is 18.08 Kg/ball, and the falling and crushing height is 1.80 m.
Comparative example 1: PVA as binding agent
9.0kg of calcium-containing titanium slag with the granularity of less than 200 meshes and 1.0kg of PVA are premixed, mixed, braised and pelletized to prepare the raw calcium-containing titanium slag pellets by using an organic binding agent.
The compressive strength of the calcium-containing titanium slag green ball is the weight loaded when the green ball begins to crack and deform in a load test, and in order to ensure that the green ball can bear the pressure of a material column without being crushed when being roasted in a rotary kiln, the compressive strength of the prepared calcium-containing titanium slag green ball is required to be 15-20 Kg/ball generally; the falling strength of the calcium-containing titanium slag green ball is based on the crushing height of the free falling body of the green ball. The diameter of the calcium-containing titanium slag green ball prepared by the comparative example is 8mm, the compressive strength is 16.54 Kg/ball, and the falling and crushing height is 1.46 m.
Comparative example 2: dextrin as binding agent
9.5kg of calcium-containing titanium slag with the granularity of less than 200 meshes and 0.5kg of PVA are premixed, mixed, braised and pelletized to prepare the raw calcium-containing titanium slag pellets by using an organic binding agent.
The compressive strength of the calcium-containing titanium slag green ball is the weight loaded when the green ball begins to crack and deform in a load test, and in order to ensure that the green ball can bear the pressure of a material column without being crushed when being roasted in a rotary kiln, the compressive strength of the prepared calcium-containing titanium slag green ball is required to be 15-20 Kg/ball generally; the falling strength of the calcium-containing titanium slag green ball is based on the crushing height of the free falling body of the green ball. The diameter of the calcium-containing titanium slag green ball prepared by the comparative example is 8mm, the compressive strength is 15.36 Kg/ball, and the falling and crushing height is 1.24 m.
Through comparing examples 1, 2, 3 with comparative examples 1, 2, the parameters using PVA and dextrin as binding agents can be seen: compared with the pelletizing material using the traditional binder, the calcium-based binder added into the calcium-containing titanium slag with the same raw material has better toughness, can bear larger external force, is not easy to crack when being collided, improves the compressive strength by 2.5 to 10 percent and improves the falling strength by 15 to 20 percent; compared with the raw pellets containing the calcium-titanium slag, which are prepared by adding the traditional organic matter binding agent, the raw pellets containing the calcium-titanium slag, which are prepared by adding the calcium-based binding agent, can avoid the burst of the pellets and greatly improve the safety of the production process.
Claims (2)
1. A calcium-containing titanium slag pelletizing technology utilizing a calcium-based binding agent is characterized in that the calcium-containing titanium slag comprises the following phases:
the method specifically comprises the following steps:
(1) adding 5-10% of calcium-based binding agent into 90-95% of calcium-containing titanium slag in percentage by mass, and placing the calcium-based binding agent and the calcium-containing titanium slag in a ball mill for premixing for 1-3 hours to obtain a mixed material with the granularity of 200 meshes;
(2) adding water accounting for 6-8% of the mass of the mixture into the mixture in percentage by mass, and continuously mixing for 10-30 minutes to obtain a calcareous cementing material;
(3) sealing and stewing the calcareous cementing material at room temperature for 30-60 minutes to obtain a stewed calcareous cementing material;
(4) starting a disc pelletizer, adding the stewed calcareous cementing material into the disc pelletizer as a mother ball material, adding water which is 3-5% of the stewed calcareous cementing material into the mother ball material in a vaporific form to manufacture a mother ball, and adding water and feeding at the same time; when the diameter of the pellet is 5-8mm, stopping pumping water and feeding, and obtaining the calcium-titanium-containing slag green pellet material using the calcium-based binding agent.
2. The calcium-containing titanium slag pelletizing technology using the calcium-based binder in the step (1) is characterized in that the calcium-based binder in the step (1) can be one or a mixture of calcium oxide fine powder, calcium chloride fine powder and calcium hydroxide fine powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010276870.7A CN111519023A (en) | 2020-04-10 | 2020-04-10 | Calcium-containing titanium slag pelletizing technology utilizing calcium-based binder |
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| CN202010276870.7A CN111519023A (en) | 2020-04-10 | 2020-04-10 | Calcium-containing titanium slag pelletizing technology utilizing calcium-based binder |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102260789A (en) * | 2010-12-07 | 2011-11-30 | 鞍钢集团矿业公司 | Pellet roasting and anti-explosion method |
| CN103898317A (en) * | 2012-12-28 | 2014-07-02 | 攀钢冶金材料有限责任公司 | Binding agent composition for titanium concentrate pelletizing and method for preparing titanium concentrate pellet |
| JP2017179389A (en) * | 2016-03-28 | 2017-10-05 | Ｊｆｅマテリアル株式会社 | Manufacturing method of titanium oxide slag and titanium oxide slag |
| CN108823404A (en) * | 2018-06-15 | 2018-11-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore pellets bentonite adhesive formula and preparation method thereof |
| CN109666790A (en) * | 2019-02-01 | 2019-04-23 | 东北大学 | A method of using calcium oxide prepare in the full vanadium titanium self fluxed pellet of low alkalinity |
-
2020
- 2020-04-10 CN CN202010276870.7A patent/CN111519023A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102260789A (en) * | 2010-12-07 | 2011-11-30 | 鞍钢集团矿业公司 | Pellet roasting and anti-explosion method |
| CN103898317A (en) * | 2012-12-28 | 2014-07-02 | 攀钢冶金材料有限责任公司 | Binding agent composition for titanium concentrate pelletizing and method for preparing titanium concentrate pellet |
| JP2017179389A (en) * | 2016-03-28 | 2017-10-05 | Ｊｆｅマテリアル株式会社 | Manufacturing method of titanium oxide slag and titanium oxide slag |
| CN108823404A (en) * | 2018-06-15 | 2018-11-16 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A kind of iron ore pellets bentonite adhesive formula and preparation method thereof |
| CN109666790A (en) * | 2019-02-01 | 2019-04-23 | 东北大学 | A method of using calcium oxide prepare in the full vanadium titanium self fluxed pellet of low alkalinity |
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Application publication date: 20200811 |
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