Hydrofluoric acid waste streams from semiconductor device manufacturing processes are collected and converted to cryolite utilizing disclosed systems and processes. The systems and processes are able to utilize hydrofluoric acid waste streams from multiple different sources. The systems and processes utilizing control delivery of reactant so that the produced cyrolite has low impurity levels and meets industry standards.

Hydrofluoric acid waste streams from semiconductor device manufacturing processes are collected and converted to cryolite utilizing disclosed systems and processes. The systems and processes are able to utilize hydrofluoric acid waste streams from multiple different sources. The systems and processes utilizing control delivery of reactant so that the produced cyrolite has low impurity levels and meets industry standards.

The disclosure provides an electrolyte supplement system in an aluminum electrolysis process, which includes low-molecular-ratio cryolite, wherein the low-molecular-ratio cryolite is selected from mKF.AlF.sub.3, nNaF.AlF.sub.3 or mixture thereof, where m=11.5 and n=11.5. When the electrolyte supplement system provided by the disclosure is applied to the aluminum electrolytic industry, electrolytic temperature can be reduced obviously in the aluminum electrolysis process without changing the existing electrolytic process; thus, power consumption is reduced, volatilization loss of fluoride is reduced and the comprehensive cost of production is reduced.

The disclosure provides an electrolyte supplement system in an aluminum electrolysis process, which includes low-molecular-ratio cryolite, wherein the low-molecular-ratio cryolite is selected from mKF.AlF.sub.3, nNaF.AlF.sub.3 or mixture thereof, where m=11.5 and n=11.5. When the electrolyte supplement system provided by the disclosure is applied to the aluminum electrolytic industry, electrolytic temperature can be reduced obviously in the aluminum electrolysis process without changing the existing electrolytic process; thus, power consumption is reduced, volatilization loss of fluoride is reduced and the comprehensive cost of production is reduced.

The solid electrolyte material of the present disclosure is a solid electrolyte material containing Li, Al, and F, comprising an amorphous substance containing Li, Al, and F. The solid electrolyte material of the present disclosure may further comprise a crystalline phase containing Li, Al, and F. The solid electrolyte material production method of the present disclosure comprises: (A) synthesizing a compound comprising a crystalline phase containing Li, Al, and F; and (B) performing a treatment to disturb the crystal of the compound. The compound may be mechanochemically treated in the step (B).

The solid electrolyte material of the present disclosure is a solid electrolyte material containing Li, Al, and F, comprising an amorphous substance containing Li, Al, and F. The solid electrolyte material of the present disclosure may further comprise a crystalline phase containing Li, Al, and F. The solid electrolyte material production method of the present disclosure comprises: (A) synthesizing a compound comprising a crystalline phase containing Li, Al, and F; and (B) performing a treatment to disturb the crystal of the compound. The compound may be mechanochemically treated in the step (B).

Different methods for the preparation of high purity NaAlCl.sub.4 are disclosed. The methods includes charging a feed having an intimate mixture of aluminum chloride, sodium chloride, and aluminum metal, to a reactor at an initial temperature less than about 80 C., carrying out a solid state reaction to form a solid NaAlCl.sub.4 at an intermediate temperature less than about 145 C., melting the formed solid NaAlCl.sub.4 at an elevated temperature greater than about 150 C. to produce molten phase NaAlCl.sub.4, holding the reactor at a raised temperature greater than about 165 C. to substantially complete formation of colorless NaAlCl.sub.4 and filtering the reactor contents at a final temperature greater than about 165 C.

A method for preparing an aluminum-zirconium-boron alloy and synchronously preparing a cryolite is provided. The method includes the following steps: Step A: placing aluminum in a reactor, heating the reactor to 700-850 degrees centigrade, and adding a mixture consisting of fluorozirconate and fluoborate in a molar ratio of x: y into the reactor; Step B: stirring the reactants for 4-6 hours and extracting the upper molten liquid to obtain a cryolite, wherein the lower substance is an aluminum-zirconium-boron alloy, and aluminum is added in an excess amount. The method provided herein for preparing an aluminum-zirconium-boron alloy which is mild in reaction condition, easy to control and simple in technical flow can prepare a high-quality product through a complete reaction, besides, the use of the synchronously prepared low molecular ratio cryolites (KF.AlF.sub.3 and NaF.AlF.sub.3) in the aluminum electrolysis industry can achieve a proper electrical conductivity.

A method for preparing an aluminum-zirconium-boron alloy and synchronously preparing a cryolite is provided. The method includes the following steps: Step A: placing aluminum in a reactor, heating the reactor to 700-850 degrees centigrade, and adding a mixture consisting of fluorozirconate and fluoborate in a molar ratio of x: y into the reactor; Step B: stirring the reactants for 4-6 hours and extracting the upper molten liquid to obtain a cryolite, wherein the lower substance is an aluminum-zirconium-boron alloy, and aluminum is added in an excess amount. The method provided herein for preparing an aluminum-zirconium-boron alloy which is mild in reaction condition, easy to control and simple in technical flow can prepare a high-quality product through a complete reaction, besides, the use of the synchronously prepared low molecular ratio cryolites (KF.AlF.sub.3 and NaF.AlF.sub.3) in the aluminum electrolysis industry can achieve a proper electrical conductivity.

Hydrofluoric acid waste streams from semiconductor device manufacturing processes are collected and converted to cryolite utilizing disclosed systems and processes. The systems and processes are able to utilize hydrofluoric acid waste streams from multiple different sources. The systems and processes control delivery of reactant so that the produced cryolite has low impurity levels and meets industry standards.