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Method for preparing sintered glass-ceramic through melting-free process

A glass-ceramic and process technology, which is applied in the field of preparing sintered glass-ceramic with iron phosphate, can solve the problems of high temperature melting and energy consumption of main and auxiliary materials, achieve good energy saving effect, good environmental benefit, and solve the problem of solid waste and waste liquid disposal. Effect

Active Publication Date: 2017-07-28
万柯楠
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is mainly to solve the shortcomings of high energy consumption caused by the high temperature melting of the main and auxiliary materials in the traditional calendering method and sintering method, combined with the ferric phosphate and mixed sodium salt produced after the recovery of low-melting non-metallic ore and lithium iron phosphate, as a production The main and auxiliary materials of glass-ceramics are prepared by advanced preparation processes such as atomization drying and dry powder granulation, and glass-ceramic products are prepared by non-melting technology

Method used

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  • Method for preparing sintered glass-ceramic through melting-free process

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Effect test

Embodiment 1

[0020] Lithium iron phosphate is acid leached and filtered to obtain acid leaching solution and acid leaching residue. During the acid leaching process, the mass ratio of water to lithium iron phosphate powder is 2:1, the amount of nitric acid added is 3mol / L, and 30% The amount of hydrogen peroxide is 3ml: 1g lithium iron phosphate powder, the leaching temperature is 30°C, and the leaching time is 12 hours; the acid leaching solution obtained by acid leaching is subjected to lithium precipitation and filtration to obtain lithium slag and lithium precipitation solution, and the lithium slag is returned to lithium recovery , during the process of lithium precipitation and filtration, add sodium bicarbonate as lithium precipitation agent, add sodium bicarbonate until the solution does not produce precipitation, the temperature of lithium precipitation is 70 ° C, and the stirring time of lithium precipitation is 0.5 hours; the acid leaching residue obtained by acid leaching and th...

Embodiment 2

[0022] Lithium iron phosphate is subjected to acid leaching and filtration to obtain acid leaching solution and acid leaching residue. During the acid leaching process, the mass ratio of water to lithium iron phosphate powder is 3:1, the amount of nitric acid added is 5mol / L, and 30% The amount of hydrogen peroxide is 5ml: 1g lithium iron phosphate powder, the leaching temperature is 60°C, and the leaching time is 36 hours; the acid leaching solution obtained by acid leaching is subjected to lithium precipitation and filtration to obtain lithium slag and lithium precipitation solution, and the lithium slag is returned to lithium recovery , during the process of lithium precipitation and filtration, add sodium bicarbonate as lithium precipitation agent, add sodium bicarbonate until the solution does not produce precipitation, the temperature of lithium precipitation is 90 ° C, and the stirring time of lithium precipitation is 2 hours; the acid leaching residue obtained by acid le...

Embodiment 3

[0024] Lithium iron phosphate is acid leached and filtered to obtain acid leaching solution and acid leaching residue. During the acid leaching process, the mass ratio of water to lithium iron phosphate powder is 2.5:1, the amount of nitric acid added is 4mol / L, and 30% The amount of hydrogen peroxide is 4ml: 1g lithium iron phosphate powder, the leaching temperature is 40°C, and the leaching time is 24 hours; the acid leaching solution obtained by acid leaching is subjected to lithium precipitation and filtration to obtain lithium slag and lithium precipitation solution, and the lithium slag is returned to lithium recovery , during the lithium sinking filtration process, add sodium bicarbonate as a lithium sinking agent, add sodium bicarbonate until the solution does not produce precipitation, the lithium sinking temperature is 80 ° C, and the lithium sinking stirring time is 1 hour; the acid leaching residue obtained by acid leaching and the heavy lithium solution obtained by...

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Abstract

The invention relates to a method for preparing a sintered glass-ceramic through a melting-free process, and belongs to the technical field of glass-ceramic preparation. According to the present invention, the sintered glass-ceramic is prepared from sodium / potassium feldspar and ferric phosphate recovered from lithium iron phosphate by using the melting-free spray drying and dry powder granulation process; the method comprises acid leaching, lithium precipitation and filtration, spray drying, dry powder granulation, material distribution and sintering, and other processes; and compared to the method in the prior art, the method of the present invention has the following advantages that the melting-free process comprising spray drying, dry powder granulation and the like is used so as to provide the good energy saving effect, and the ferric phosphate recovered from lithium iron phosphate and the mixed sodium salt are adopted as the raw materials for the glass-ceramic so as to solve the solid waste and waste liquid treatment problem during the lithium iron phosphate recovery process and provide the good environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of glass-ceramics preparation, and in particular relates to a method for preparing sintered glass-ceramics by adopting non-melting, spray-drying and dry powder granulation techniques in cooperation with ferric phosphate recovered from sodium / potassium feldspar and lithium iron phosphate. Background technique [0002] Glass-ceramics, also known as glass ceramics, is a kind of polycrystalline solid material containing a large number of microcrystalline phases and glass phases, which is obtained by controlling the crystallization of a specific composition of basic glass during the heating process. Although the structure, performance and production methods of glass-ceramics are different from those of glass and ceramics, glass-ceramics combines the characteristics of glass and ceramics, and has both the basic properties of glass and the polycrystalline characteristics of ceramics. unique new material. Glass-cer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C10/00C03C6/06C03C6/02
CPCC03C1/02C03C10/0063
Inventor 万柯楠
Owner 万柯楠