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Method for preparing acid-soluble titanium slag by high titanium slag through microwave irradiation

A technology of acid-soluble titanium slag and microwave irradiation is applied in the field of preparing acid-soluble titanium slag and acid-soluble titanium slag, which can solve the problem of reducing the recovery rate of titanium and iron, incomplete separation of high-titanium slag and molten iron, and large amount of pig iron and titanium slag. and other problems, to achieve the effect of less waste, saving three waste treatment costs, and simple process

Inactive Publication Date: 2010-07-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the electric furnace smelts ilmenite with high non-ferrous impurities such as CaO and MgO, only titanium slag suitable for sulfuric acid titanium dioxide production can be obtained.
However, when the electric furnace is used to reduce ilmenite concentrate to separate pig iron to prepare high-titanium slag, if acid-soluble titanium slag is to be obtained, it cannot be deeply reduced, because a certain proportion of FeO needs to be retained in the slag, resulting in incomplete separation of high-titanium slag and molten iron. , the amount of titanium slag entrained in the obtained pig iron is large, on the one hand, it will bring a negative impact on the subsequent processing of pig iron, on the other hand, it will reduce the recovery rate of titanium and iron
If the high-titanium slag that can completely separate titanium and iron in the electric furnace smelting process is used to produce titanium dioxide by the sulfuric acid method, the leaching rate of titanium dioxide can only reach 60wt% to 70wt%.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: The content is calculated as TiO in wt% 2 92.5 high titanium slag, containing CaCO 3 98% calcium carbonate, containing NaNO 3 Greater than 95% NaNO 3 Dried separately and crushed to a particle size of <0.15mm for use. Weigh 100g of the prepared high-titanium slag, 20g of calcium carbonate, and 10g of sodium nitrate respectively, put them in a mortar and mix for 30 minutes, and then put the mixed materials in a homemade microwave oven with a power of 1500W. Calcined for 0.5 h, cooled to room temperature, and crushed to a particle size of less than 0.15 mm to obtain 121.6 g of acid-soluble titanium slag that can be used to prepare titanium white by sulfuric acid method. The obtained acid-soluble titanium slag was matured with 85wt% sulfuric acid solution at a temperature of 230°C for 90min, and then leached with 600mL of tap water at a temperature of 70°C for 30min, and the leaching rate of titanium dioxide was 96.2wt%.

Embodiment 2

[0018] Example 2: Calculate the content in wt% as TiO 2 92.5 high titanium slag, quicklime with 95% CaO, NaNO 3 Greater than 95% NaNO 3 Dried separately and crushed to a particle size of <0.15mm for use. Weigh 100g of the prepared high-titanium slag, 15g of quicklime, and 15g of sodium nitrate respectively, put them in a mortar and mix them for 20 minutes, then put the mixed materials in a self-made microwave oven with a power of 1500W, and roast them at a temperature of 1100°C After cooling to room temperature for 1 hour, crush to a particle size of less than 0.15 mm to obtain 127.5 g of acid-soluble titanium slag that can be used in the sulfuric acid process to prepare titanium white. The obtained acid-soluble titanium slag was matured with 90wt% sulfuric acid solution at a temperature of 250°C for 60min, then leached with 600mL of tap water at a temperature of 60°C for 60min, and the leaching rate of titanium dioxide was 96.1wt%.

Embodiment 3

[0019] Example 3: Calculate the content in wt% as TiO 2 92.5 high titanium slag, containing CaCO 3 98% calcium carbonate, quicklime containing 95% CaO, containing NaNO 3 Greater than 95% NaNO 3 Dried separately and crushed to a particle size of <0.15mm for use. Weigh 100g of the above-mentioned high-titanium slag, 10g of calcium carbonate, 10g of quicklime, and 15g of sodium nitrate, mix them in a mortar for 30 minutes, and then put the mixed materials in a self-made microwave oven with a power of 1500W. Calcined for 0.5 h, cooled to room temperature, and crushed to a particle size of less than 0.15 mm to obtain 126.2 g of acid-soluble titanium slag that can be used to prepare titanium white by sulfuric acid method. The obtained acid-soluble titanium slag was matured with 85wt% sulfuric acid solution at a temperature of 250°C for 90min, then leached with 600mL of tap water at a temperature of 60°C for 90min, and the leaching rate of titanium dioxide was 95.8wt%.

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Abstract

The invention relates to a method for preparing acid-soluble titanium slag by high titanium slag through microwave irradiation, which comprises the following steps: pulverizing high titanium slag, oxidizers (either sodium nitrate or ammonium nitrate or a mixture of the sodium nitrate and the ammonium nitrate) and calcium oxide or calcium carbonate; adopting microwave irradiation for heating after mixing the ingredients; carrying out modification at the high temperature; converting and reconstructing rutile type or anatase type TiO2 and FeTiO3 in the slag into CaTiO3 mineral phases; after cooling, obtaining acid-soluble titanium slag raw materials suitable for preparing titanium pigments by a sulfuric acid method; curing the acid-soluble titanium slag by sulfuric acid; and leaching the acid-soluble titanium slag by water at a leaching rate between 95.8 and 96.2 weight percent.

Description

1. Technical field [0001] The invention relates to a method for preparing acid-soluble titanium slag after high-titanium slag undergoes mineral phase reconstruction. Specifically, the invention relates to a method for acid-soluble titanium slag that can meet the requirements for producing titanium dioxide, and belongs to the field of titanium metallurgy. 2. Background technology [0002] High titanium slag refers to the 2 It is more than 70wt% titanium slag, and the high titanium slag can be used not only as a raw material for producing titanium white by sulfuric acid process, but also as a large amount of raw material for producing titanium white in chlorination process. In China, the titanium slag used for the production of titanium dioxide by the sulfuric acid method is called acid-soluble titanium slag. It is mainly prepared by smelting ilmenite in an electric furnace. Generally, carbonaceous raw materials such as anthracite, coke or petroleum coke are used as reducin...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B3/08C22B34/12
Inventor 廖亚龙徐福昌彭金辉
Owner KUNMING UNIV OF SCI & TECH
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