Component of glass raw material and method for producing optical glass
A glass raw material and optical glass technology, applied in the field of optical glass manufacturing, glass raw material composition containing lanthanum oxide, can solve the problem of low refractive index of glass
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Embodiment 1
[0064] High-purity powdered La 2 o 3 The raw material is used as a raw material component of optical glass, and it is sealed in a soft container. The inner bag of the flexible container is an aluminum-lined vinyl bag (aluminum bag) or a polyethylene bag, and the inner bag is filled with La 2 o 3 After raw materials, the inside is decompressed and sealed (vacuum packing). The inside of the aluminum bag becomes dry by decompression. So ready to pack with La 2 o 3 The soft container of the raw material is placed in an environment where the temperature is maintained at 25°C and the humidity is 30%, and the La is measured every week after unsealing. 2 o 3 The loss on ignition (moisture content) of the raw material, the result is as follows figure 2 shown.
[0065] Among them, La 2 o 3 The mass of raw material W minus La 2 o 3 Initial mass of raw material W O Divide by the initial mass W O The obtained value expressed as a percentage is La 2 o 3 Ignition loss of ra...
Embodiment 2
[0070] The La of embodiment 1 2 o 3 After the raw material is opened, move it directly to the raw material storage box, and store La in the case of passing dry air into the box. 2 o 3 raw material. Moreover, the dry air used is nitrogen with a dew point less than or equal to -50°C.
[0071] In order to ensure that La is stored under the condition of dry air 2 o 3 The effect of raw materials was tested as follows.
[0072] Figure 4 It is a schematic diagram illustrating the change of the loss on ignition in the following three states, one of which is to store 30g of La 2 o 3 Changes in the loss on ignition of raw materials; the second is to store 50g of La in a sealed plastic container 2 o 3 Changes in loss on ignition when raw materials; third, store 50g of La in the open state of the plastic container 2 o 3 Changes in loss on ignition when raw materials. Depend on Figure 4 It can be seen that if the La 2 o 3 Raw materials, the effect obtained is the same as ...
Embodiment 3
[0075] Using the La of Example 1 2 o 3 Raw material to manufacture containing 19 mass% B 2 o 3 , 35% by mass La 2 o 3 The optical glass (does not contain phosphorus), at first the La of embodiment 1 2 o 3 The raw material is unsealed, and immediately mixed with other glass raw materials SiO 2 、H 3 BO 3 , ZnO, ZrO 2 、TiO 2 , Nb 2 o 5 、WO 3 Weigh and mix together, and the weighing amount of each component is to make the refractive index (n d ) is 1.83400, Abbe's number (υ d ) is an amount of 37.3. And for all except La 2 o 3 The above-mentioned raw materials other than the raw materials are not stored in a dry atmosphere or in a sealed state.
[0076] While supplying the mixed raw materials to a melting vessel made of platinum alloy, heating, melting, clarification, and homogenization were performed according to conventional methods, and they flowed out continuously at a constant flow rate from a conduit.
[0077] While pouring the outflowing glass into a mold...
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