Method for clarifying and decoloring float glass

Abstract

The invention provides a method for clarifying and decoloring float glass. On the basis of the common float glass, a lanthanum carbonate [La2(CO3)3], cerium carbonate [Ce2(CO3)3], praseodymium carbonate [Pr2(CO3)3] and sodium sulfate (NaSO4) composite clarifying and decoloring agent is added, or rare earth richment (lanthanum cerium carbonate richment or lanthanum cerium praseodymium carbonate richment) which is initially separated from rare-earth mineral in Baotou and sodium sulfate are added, so that the thickness of the melted glass is 4 millimeters, visible light transmissivity in wavelength range of 380 to 780 nm is over 94 percent, whiteness is less than 0.085, breaking strength is more than 310 MPa, and microhardness is more than 8,100 MPa. The glass has high visible light transmissivity, small whiteness value, high breaking strength and high microhardness. The quality of the white float glass is obviously improved. The method can be widely applied in the fields of building glass, photovoltaic electric technology, experimental apparatuses and the like.

Description

Technical field: [0001] The invention relates to a method for clarifying and decolorizing float glass, which can be widely used in architectural glass, photovoltaic technology and experimental instruments, and belongs to the field of glass preparation. Background technique: [0002] In recent years, with the rapid development of my country's economy, the level of optoelectronic technology and experimental research has been greatly improved, and the market demand for ultra-clear and ultra-hard glass has expanded. However, the production of ultra-clear glass is difficult and costly, and the supply exceeds demand. As we all know, the color of white float glass is caused by the iron oxide in the raw material, iron in the glass as Fe 2+ and Fe 3+ Exist, Fe 2+ Make the glass blue-green, Fe 3+ Make the glass yellow-green, Fe 2+ is Fe 3+ Twelve times the coloring power, the color of the glass is determined by Fe 2+ and Fe 3+ The balance state is determined. [0003] At prese...

AI Technical Summary

Problems solved by technology

[0008] Most of the above inventions utilize the addition of a large amount of cerium oxide and sulfate as clarifiers, or the addition of MnO 2 、Nd 2 o 3 , La 2 o 3 etc., to achieve the purpose of physical and chemical simultaneous decolorization, but the cost of rare earth oxides is higher, MnO 2 、Nd 2 o 3 The glass will have a gray tone, which reduces the transmittance of the glass and affects the quality of the glass

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