Home › House Painting › Buchner's Soluble Soda Glass

Buchner's Soluble Soda Glass

patent for the manufacture of soluble glass Take 100 parts quartz, 60 parts dry sulphate consists in the production of a liquid quartz of soda, and

15 to 20 parts charcoal. This is by digesting the sand or quartz in a. steamdigesting the sand or quartz in a steamsaid to be cheaper than that made with car- boiler tightly closed and at a temperature bonate of soda, and is prepared in the same corresponding to 4 or 5 atmospheres, with the manner. By the addition of some copper common caustic alkalies, which are in this scales to the mixture the sulphur will be sep- way capacitated to dissolve from 3 to 4 times arated. Another method is proposed by dis- the weight of silica to a thin liquid. Experithe weight of silica to a thin liquid. Experisolving the fine silex in caustic soda lye. ence has taught that the soluble glass made Kuhlman employs the powdered flint, which in the old way, with an excess of alkali, canin the old way, with an excess of alkali, canis dissolved in an iron caldron under a pres- not stand the influence of the atmosphere sure of 7 to 8 atmospheres of steam. Liebig when used as a paint. The soda washes out, has recommended infusorial earth in place of and leaves the silex in a pulverized condition, sand, on account of its being readily soluble so that it soon disappears. When, however, in caustic lye; and he proposes to use 120 a closed boiler is used, according to Kuhlman's or Siemens' method, and a pressure of 7 or 8 atmospheres, which corresponds with a temperature of some 120° above the boiling point of water, the solvent qualities of the latter parts of the earth to 75 parts of caustic soda, from which 240 parts of silica jelly may be obtained. His mode is to calcine the earth so as to become white, and passing it through a sieve. The lye he prepares from 75 ounces of are increased to such an extent as to enable it calcined soda, dissolved in 5 times the quan- to dissolve a glass containing 1 to 1/2 the amount dissolve a glass containing to the amount tity of boiling water, and then treated by 56 of potash or soda. ounces of dry slacked lime; this lye is concentrated by boiling down to 48° Baumé; in this boiling lye 120 ounces of the prepared infusorial earth are added by degrees, which are readily dissolved, leaving scarcely any sediment. It has then to undergo several operations for making it suitable for use, such as treating again with lime-water, boiling it To Dye Dyeing wood is mostly applied for giving color to veneers, while staining is more generally had recourse to, to give the desired color to an article and separating any precipitate, which by con- after it has been manufactured. In the one tinued boiling forms into balls, and which can case, the color should penetrate throughout, then be removed from the liquid. This clear while in the latter the surface is all that is esclear while in the latter the surface is all that is esliquid is then evaporated to the consistency sential. After the veneers are cut, they should of syrup; it forms a jelly slightly colored, be allowed to lie in a trough of water for 4 or feels dry and not sticky, and is readily soluble 5 days before being put into the copper; as in boiling water. The difference between the water brings out abundance of slimy matbetween the water brings out abundance of slimy matpotash and soda soluble glass is not material; ter, which, if not thus removed, would prevent the first may may be preferred in whitewashing the wood taking a good color. After this puwith plaster of Paris, while the soda glass is rifying process, the veneers should be dried in the open air for at least 12 hours. They are more fluidly divisible.

2320. To Distinguish Potash and then ready for the copper. By this simple Soda Soluble Glass. By adding volume method, the color will strike much quicker, of rectified alcohol to a concentrated solution and be of a brighter hue. It would also add of soluble potash glass, a gelatinous precipi- to the quality of the colors, if, after the Tethe quality of the colors, if, after the vetate is formed, which, in a few days, is de- neers have boiled a few hours, they are taken posited at the bottom of the vessel in a solid out, dried in the air, and again immersed in mass. The addition of alcohol to soluble soda the coloring copper. Always dry veneers in glass converts it into a gelatinous mass, but affords no precipitate. 2821. Το Make Wood Incombustible.

The application of soluble glass to wood renders it almost incombustible.