Method for preparing zirconium boride and synchronously preparing cryolite

Abstract

A method for preparing zirconium boride and synchronously preparing a cryolite is provided which includes the following steps: Step A: placing aluminum in a reactor, heating the reactor to 700-850 degrees centigrade, and adding the mixture of fluorozirconate and fluoborate; and Step B: stirring the reactants for 4-6 hours and extracting the upper molten liquid to obtain a cryolite, wherein the lower substance is zirconium boride. The disclosure has the following beneficial effects: the new zirconium boride preparation method provided herein is simple in preparation flow and the device used, short in preparation period and high in reaction efficiency, the prepared zirconium boride with many contact angles has a large specific surface area and contains a controllable amount of aluminum.

Claims

1. A method for preparing zirconium boride and synchronously preparing a cryolite, comprising: placing aluminum in a reactor, heating the reactor to 700-850 degrees centigrade, adding a mixture of fluorozirconate and fluoborate; and stirring the reactants for 4-6 hours and extracting an upper molten liquid to obtain a cryolite, wherein a lower substance is zirconium boride.

2. The method according to claim 1, wherein a molar ratio of the fluorozirconate to the fluoborate is 2:1.

3. The method according to claim 2, wherein the fluorozirconate is potassium fluozirconate and the fluoborate is potassium fluoborate.

4. The method according to claim 3, wherein the cryolite obtained in Step B is a potassium cryolite the molecular formula of which is 6/5KF.Math.AlF.sub.3.

5. The method of claim 3, wherein a chemical equation involved in the method is $\frac{10}{3}\mathrm{Al}+K_2{\mathrm{ZrF}}_6+2{\mathrm{KBF}}_4={\mathrm{ZrB}}_2+\frac{10}{3}\left(\frac{6}{5}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right).$

6. The method according to claim 2, wherein the fluorozirconate is sodium fluozirconate and the fluoborate is sodium fluoborate.

7. The method according to claim 6, wherein the cryolite obtained in Step B is a sodium cryolite the molecular formula of which is 6/5NaF.Math.AlF.sub.3.

8. The method of claim 6, wherein a chemical equation involved in the method is $\frac{10}{3}\mathrm{Al}+{\mathrm{Na}}_2{\mathrm{ZrF}}_6+2{\mathrm{NaBF}}_4={\mathrm{ZrB}}_2+\frac{10}{3}\left(\frac{6}{5}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right).$

Description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

(1) The disclosure is described below in detail with reference to specific embodiments.

Embodiment 1

(2) One ton of aluminum is weighted and placed in a reactor, the reactor is vacuumized and fed with argon for protection and then heated to 750 degrees centigrade, a mixture consisting of dry potassium fluoborate and dry potassium fluozirconate in a reaction ratio is slowly added into the reactor, wherein the molar ratio of potassium fluoborate to potassium fluozirconate is 2:1, the reactants are rapidly stirred for 5 hours to generate zirconium boride and a potassium cryolite

(3) $\frac{6}{5}\mathrm{KF}.Math.{\mathrm{AlF}}_3,$
then the cover of the reactor is opened, the upper molten liquid potassium cryolite is pumped out using a siphon pump.

(4) When an electrolyte consisting of the potassium cryolite

(5) $\left(\frac{6}{5}\mathrm{KF}.Math.{\mathrm{AlF}}_3\right)$
provided herein and aluminium oxide is used in an aluminum electrolysis industry, the working range of an electrolysis temperature can be controlled between 900-960 degrees centigrade.

Embodiment 2

(6) One ton of aluminum is weighted and placed in a reactor, the reactor is vacuumized and fed with argon for protection and then heated to 750 degrees centigrade, a mixture consisting of dry sodium fluoborate and dry sodium fluozirconate in a reaction ratio is slowly added into the reactor, wherein the molar ratio of sodium fluoborate to sodium fluozirconate is 2:1, the reactants are rapidly stirred for 5 hours to generate zirconium boride and a sodium cryolite

(7) $\frac{6}{5}\mathrm{NaF}.Math.{\mathrm{AlF}}_3,$
then the cover of the reactor is opened, the upper molten liquid sodium cryolite is pumped out using a siphon pump.

(8) When an electrolyte consisting of the sodium cryolite

(9) $\left(\frac{6}{5}\mathrm{NaF}.Math.{\mathrm{AlF}}_3\right)$
provided herein and aluminum oxide is used in an aluminum electrolysis industry, the working range of an electrolysis temperature can be controlled between 900-960 degrees centigrade.

(10) The above is detailed description of the disclosure with reference to specific preferred embodiments which is not to be construed as limiting the disclosure. The various simple deductions or replacements that can be devised by those of ordinary skill in the art without departing from the concept of the disclosure all fall within the protection scope of the disclosure.