High-efficiency and energy-saving potassium titanate whisker preparation method

A potassium titanate whisker, high-efficiency and energy-saving technology, applied in the field of material chemistry, can solve problems such as waste of energy, low production efficiency, harsh preparation conditions, etc., to achieve improved energy utilization, excellent thermal insulation performance, and complete crystal structure Effect

Active Publication Date: 2011-02-02
马玉馨
17 Cites 21 Cited by

AI-Extracted Technical Summary

Problems solved by technology

In these methods, the product is mostly potassium hexatitanate, and potassium titanate whisker products with different compositions such as di, tetra, hexa and octa can not be accurately obtained through process control.
Some of the existing methods have harsh preparation conditions, high energy consumption, low yield, serious environmental pollution or low product purity (the product is not a pure white crystal, but a product with a yellow phase), and d...
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Abstract

The invention discloses a high-efficiency and energy-saving potassium titanate whisker preparation method, which comprises: firstly, mixing and grinding a titanium raw material and a potassium raw material, and preheating; and secondly, calcining, crushing, absorbing and desorbing moisture, converting potassium ions, forming and obtaining pure white potassium titanate whiskers. In the invention, potassium dititanate is crushed by a machine, the moisture absorption and desorption speed is improved, and the production efficiency is improved considerably; through heat recycling, the energy consumption is reduced greatly; heat generated in a high-temperature area is used in a preheating kiln and a constant-temperature moisture absorption and desorption kiln, the structural integrity of the crystals and the utilization rate of raw materials are improved, and the high-efficiency and energy-saving preparation of potassium titanate whisker is realized; and a quantitative injection mode is used to realize the quantitative digestion conversion of the potassium ions, so the effective control of different whiskers is realized and the obtained whisker products have complete crystal structure and contain white crystals with flaky, lamellar or needle-like shapes. The product can be widely used in fields of thermal insulation, reinforcement, corrosion prevention, toughening and the like.

Application Domain

Technology Topic

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  • High-efficiency and energy-saving potassium titanate whisker preparation method
  • High-efficiency and energy-saving potassium titanate whisker preparation method
  • High-efficiency and energy-saving potassium titanate whisker preparation method

Examples

  • Experimental program(4)

Example Embodiment

[0027] Example 1
[0028] After weighing the titanium dioxide source and potassium source potassium oxide at a molar ratio of 1:1, mechanically grind until the system is uniform to obtain the precursor required for preparing the whiskers; place the precursor in the crucible at 35°C, and preheat The time is 5 hours; the preheated precursor is calcined in a continuous rotary calcining kiln at a temperature of 800℃, and the calcination time is 5 hours; after high-temperature calcination, it is crushed by a machine and placed at a humidity of 100% and a temperature of 100℃ In the moisture absorption deweaving kiln for 24 hours, potassium dititanate is obtained; the potassium dititanate is neutralized by a quantitative pickling device to complete the quantitative conversion of potassium ions, and filtered to obtain titanium with different compositions Potassium titanate whiskers: The obtained potassium titanate whiskers are subjected to high-temperature shaping treatment in a shaping kiln. The temperature of the shaping kiln is 500°C and the shaping time is 5 hours. A pure white needle-like potassium hexatitanate whisker product can be obtained. The length of this potassium titanate whisker is 40-50μm and the width is 12-15μm.

Example Embodiment

[0029] Example 2
[0030] After the titanium source metatitanic acid and potassium source potassium hydroxide are weighed in a ratio of 1:6 molar ratio of titanium to potassium atoms, they are mechanically ground until the system is uniform to obtain the precursor required for preparing whiskers; In a crucible at 500°C, the preheating time is 0.1 hour; the preheated precursor is put into a continuous rotary calcining kiln for calcination at a temperature of 1300°C, and the calcination time is 0.5 hours; after high-temperature calcination, the machine is crushed to absorb moisture and dewoven The moisture absorption and deweaving time is 2 hours, the humidity is 70%, and the temperature is 400°C. After the calcined product is crushed by a machine, it is put into a constant temperature and humidity hygroscopic hydrolysis kiln for hygroscopic hydrolysis to obtain potassium dititanate; the potassium dititanate is neutralized by a quantitative pickling device to complete the quantification of potassium ions After conversion, filtration and drying, different potassium titanate whiskers can be obtained; the obtained potassium titanate whiskers are subjected to high-temperature shaping treatment in a shaping kiln. The temperature of the shaping kiln is 1000°C and the shaping time is 0.5 hours. A pure white potassium tetratitanate layered whisker product can be obtained. The length of the potassium titanate whisker is 90-100 μm and the width is 30-40 μm.

Example Embodiment

[0031] Example 3
[0032] After weighing the titanium dioxide source and potassium source potassium carbonate at a molar ratio of 1:4, mechanically grind until the system is uniform to obtain the precursor required for preparing whiskers; place the precursor in a crucible at 300°C and preheat The time is 3 hours; the preheated precursor is calcined in a continuous rotary calcining kiln at a temperature of 800℃, and the calcining time is 5 hours; after high-temperature sintering and high-temperature calcination, the machine crushes, absorbs moisture, deweaves, and absorbs moisture. The time is 4 hours, the humidity is 90%, and the temperature is 300°C. After the calcined product is crushed by a machine, it is put into a constant temperature and humidity hygroscopic hydrolysis kiln for hygroscopic hydrolysis to obtain potassium dititanate; the potassium dititanate is neutralized by a quantitative pickling device to complete the quantification of potassium ions After conversion, filtration and drying, different potassium titanate whiskers can be obtained; the obtained potassium titanate whiskers are subjected to high-temperature shaping treatment in a shaping kiln. The temperature of the shaping kiln is 600°C and the shaping time is 4 hours. A pure white potassium octatitanate whisker product can be obtained. The potassium titanate whisker has a length of 60-80 μm and a width of 10-15 μm.
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