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Method for preparing kalium-magnesium titanate by carnallite

A technology of potassium magnesium titanate and carnallite, applied in chemical instruments and methods, titanium compounds, inorganic chemistry, etc., to achieve the effects of reducing raw material costs, improving production efficiency, and improving product quality

Inactive Publication Date: 2008-09-03
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of preparing potassium magnesium titanate lamellae or whiskers with carnallite as raw material or flux has not been reported yet.

Method used

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  • Method for preparing kalium-magnesium titanate by carnallite
  • Method for preparing kalium-magnesium titanate by carnallite
  • Method for preparing kalium-magnesium titanate by carnallite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Carnallite, TiO 2 (Anatase), KOH and KNO 3 by KMgCl 3 :TiO 2 : K 2 The ratio of O=1:4.5:1.5 is uniformly mixed, the mixture is sintered in a high-temperature furnace to 1000°C, kept for 1 hour, and then cooled with the furnace; the sintered product is pulverized, washed with water, filtered, dried, and then heated at 700°C Under heat treatment. The obtained product is potassium magnesium titanate lamellae whose arithmetic mean value of equivalent length and equivalent width is 1-5 μm, the ratio of equivalent length and equivalent width is 1-3, and the average thickness is 0.05-1 μm; Fluorescence X-ray diffraction analysis, its chemical formula is K 0.8 Mg 0.4 Ti 1.6 o 4 (Such as figure 2 shown). Figure 4 K before and after heat treatment 0.8 Mg 0.4 Ti 1.6 o 4 The comparison of the X-ray peak intensities of the lamellar crystals shows that the crystallinity of the product without heat treatment is relatively poor.

Embodiment 2

[0027] Carnallite, TiO 2 (rutile type) and K 2 CO 3 by KMgCl 3 :TiO 2 : K 2 The ratio of O=1:4.5:2.5 is uniformly mixed, and the mixture is sintered in a high-temperature furnace to 1100°C, kept for 30 minutes, and then cooled with the furnace; the sintered product is crushed, washed with water, and filtered; then heat-treated at 300°C. The obtained product is potassium magnesium titanate lamellar crystals whose arithmetic average of equivalent length and equivalent width is 50 μm, ratio of equivalent length and equivalent width is 1.5, and average thickness is 2-5 μm; Diffraction analysis, its chemical formula is K 0.6 Mg 0.4 Ti 1.6 o 4 .

Embodiment 3

[0029] Carnallite, hydrated titanium oxide and KNO 3 by KMgCl 3 :TiO 2 : K 2 The ratio of O=1:3.5:1 was uniformly mixed, the mixture was sintered in a high-temperature furnace to 800° C., kept for 6 hours, and then cooled with the furnace; the rest of the operations were the same as in Example 1. The resulting product is a potassium magnesium titanate whisker with a length of 10-20 μm and a diameter of 0.5 μm; analyzed by X-ray diffraction, its chemical formula is K 2 MgTi 7 o 16 (Such as image 3 shown).

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Abstract

The invention discloses a method for preparing potassium magnesium titanate, which includes using carnallite, titanium-containing and potassium-containing compounds as the material, mixing evenly; sintering at 800-1100 DEG C for 30 min-12 h, pulverizing, water washing, filtering, and heat-treating to obtain potassium magnesium titanate. The natural carnallite is used as the material to reduce the material cost of potassium magnesium titanate. Whiskers or lamellas of different purpose can be obtained by adjusting the material proportion. The preparation method simplifies the technological process and improves the production efficiency and is more suitable for large-scale production.

Description

technical field [0001] The invention belongs to the field of inorganic materials, and in particular relates to a method for preparing potassium magnesium titanate, especially potassium magnesium titanate lamellae or whiskers, from carnallite. Background technique [0002] Potassium magnesium titanate, in flake K 0.8 Mg 0.4 Ti 1.6 o 4 As a representative, it is a new type of high-performance inorganic material, which can be used as friction material, reinforcing material, ion exchange material, etc., so it has attracted more and more attention. Japanese Patent Laid-Open 5-221795 once described layered potassium magnesium titanate (K 0.8 Mg 0.4 Ti 1.6 o 4 ) lamella preparation method, Japanese Patent Publication 2000-230618 has described using it as a friction control agent for friction materials, and the prepared friction materials have stable friction and wear properties from low temperature to high temperature; while potassium magnesium titanate (K 0.8 Mg 0.4 Ti 1...

Claims

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Application Information

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IPC IPC(8): C01G23/00
Inventor 陆小华王昌松赵利顺姚文俊刘畅冯新
Owner NANJING UNIV OF TECH
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