Technology for manufacturing high-quality titanium slag through three-section method

A high-quality, three-stage technology, applied in the direction of improving process efficiency, can solve the problems of air pollution, waste of titanium resources, heat removal, etc., and achieve the effect of simple process flow and strong adaptability

Inactive Publication Date: 2016-04-06
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the process of smelting titanium slag in a large-scale closed DC electric arc furnace, 5% of smoke and dust will be produced. The direct emission of smoke and dust will pollute the atmosphere and take away heat, resulting in a great waste of titanium resources. For this reason, we have developed a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1. TiO 2 The raw material of titanium slag with a content of 35% is ball milled to -200 mesh, and 300gK 2 CO 3 After mixing evenly with 700g of finely ground titanium slag, enter the rotary kiln and heat up to 900°C to roast for 1 hour, then wash with water and filter to obtain filter residue;

[0025] 2. Put the obtained filter residue and 20% sulfuric acid into a pressurized zirconium kettle with a solid-to-liquid ratio of 6:1, heat up to 120°C for acid leaching for 2 hours, and stir at a speed of 500r / min; after acid leaching, wash and filter to pH= 7. Put it into a rotary kiln and heat up to 900°C for 1 hour to obtain fine-grained titanium slag;

[0026] 3. Mix the fine-grained titanium slag with 3% CMC and low-calcium-magnesium bentonite evenly, put it into a granulator at a speed of 80r / min to granulate, and microwave dry to obtain TiO2 of titanium slag. 2 94.25%, CaO=0.086%, MgO=0.45%, 0.55mm particle size distribution ≥ 90%, moisture=0.25%, and the compressiv...

Embodiment 2

[0028] 1. Put TiO 2 The raw material of titanium slag with a content of 54% is ball milled to -200 mesh, and 400gNa 2 CO 3 After mixing evenly with 600g of finely ground titanium slag, enter the rotary kiln and heat up to 920°C for 1 hour of roasting, then wash with water and filter to obtain the filter residue;

[0029] 2. Put the filter residue and 25% sulfuric acid into a pressurized zirconium kettle with a solid-to-liquid ratio of 9:1, heat up to 130°C for acid leaching for 2 hours, and stir at a speed of 450r / min; after acid leaching, wash and filter to pH=7. Put it into a rotary kiln and heat up to 900°C for 1 hour to obtain fine-grained titanium slag;

[0030] 3. Mix the fine-grained titanium slag with 5% CMC, corn starch, and low-calcium-magnesium bentonite evenly, put it into a granulator at a speed of 100r / min to granulate, and microwave dry to obtain TiO2 of titanium slag. 2 91.25%, CaO=0.046%, MgO=0.55%, 0.49mm particle size distribution ≥ 90%, moisture=0.27%, a...

Embodiment 3

[0032] 1. Put TiO 2 The raw material of titanium slag with a content of 71% is ball milled to -200 mesh, 300g of NaOH and 700g of finely ground titanium slag are mixed evenly, then put into a rotary kiln and heated to 870°C for 1.5h, then washed with water and filtered to obtain a filter residue;

[0033] 2. Put the filter residue and 30% sulfuric acid into a pressurized zirconium kettle with a solid-to-liquid ratio of 6:1, heat up to 140°C for acid leaching for 2 hours, and stir at a speed of 550r / min; after acid leaching, wash and filter to pH=7. Put it into a rotary kiln and heat up to 850°C for 1 hour to obtain fine-grained titanium slag;

[0034] 3. Mix the fine-grained titanium slag with 6% CMC, dextrin, wheat straw powder, and low-calcium-magnesium bentonite evenly, put it into a granulator at a speed of 85r / min to granulate, and microwave dry to obtain TiO2 of titanium slag. 2 93.25%, CaO=0.037%, MgO=0.63%, 0.42mm particle size distribution ≥ 90%, moisture=0.25%, and ...

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Abstract

The invention discloses a technology for manufacturing high-quality titanium slag through a three-section method. The technology includes the steps of titanium slag modifying, pressurizing acid leaching and pelleting; high-calcium-magnesium and low-grade titanium slag raw materials are subjected to ball grinding to -200 meshes, evenly mixed with a modifying agent, enter a rotary kiln to be roasted and then filtered and washed to obtain filter slag; the obtained filter slag is put into a pressurizing kettle to be subjected to pressurizing acid leaching, the filter slag is washed, filtered, dried and roasted after being discharged out of the kettle, and fine-grain titanium slag is obtained; and the obtained fine-grain titanium slag and a bonding agent are mixed evenly and put into a pelletizer for pelleting, microwave drying is conducted, and the high-quality titanium slag is obtained. The technology is simple in process, titanium slag smelting smoke of a large airtight direct-current electric arc furnace can be comprehensively utilized, and the prepared high-quality titanium slag is low in calcium and magnesium content and can be used as the raw material of a boiling chlorination process. Meanwhile, adaptability to titanium slag raw materials is high, and the technology can be suitable for titanium slag with the content of TiO2 being 35%-70%.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal smelting, and in particular relates to a process for preparing high-quality titanium slag by a three-stage method. Background technique [0002] Yunnan Province is rich in titanium resources, but the content of calcium and magnesium in the titanium concentrate produced by it is high, usually CaO+MgO is 1.2%~1.9%, and the CaO+MgO of titanium slag after smelting reaches 2.4%~3.8%, which cannot meet the requirements of boiling chlorine. The requirements of the chemical method (≤0.6%~1.2%), as the production capacity of the domestic boiling chlorination production line has reached 400kt / a, the demand for high-quality titanium slag has increased significantly, but the improved boiling chlorination production process requires the raw material TiO 2 When the grade reaches over 90%, the content of CaO must be controlled to be ≤0.1%, and MgO≤1.5%. The reason is that during the boiling chlorination...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B7/04C22B34/12
CPCC22B1/02C22B34/1213Y02P10/20
Inventor 周娴雷霆周林包崇军赵云杨筱筱李雨耕曹瑞珂
Owner KUNMING METALLURGY INST
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