艺术
美容与健康
工艺
文化与历史
娱乐
环境
食品与饮料
逆向工程
科学
体育
技术
可穿戴设备
Youblob · CC0
Precipitated Silica: Hot Water Glass Carbonated, Then Acidified to pH 6.75 (Allen 1957)
Bubble carbon dioxide through hot dilute water glass and the silica comes down as an extremely fine white powder rather than a gel. Edward Allen of Columbia-Southern made it this way as a white reinforcing filler for rubber; this follows his Example XI, which gave a powder of 148 m² per gram.
Source: E. M. Allen (Columbia-Southern), US 2,805,955 (1957), Example XI. The percentages are our arithmetic; the filter, mill and indicator are ours. Picture drawn by Youblob.
中级
2 days
说明
1
1
Dilute the water glass
Dilute the water glass
Take 12,850 g of sodium silicate solution holding 976 g Na2O and 3115 g SiO2 (7.6 % and 24.2 %, a silica to soda ratio of 3.19 by weight; our arithmetic). Dilute it with water to 48 litres in a stirred kettle with a heating coil and thermometer, and heat to 95 °C.
此步骤所需材料：
水玻璃（硅酸钠溶液）12850 克
水1 as required所需工具：
压力反应器
搅拌器
温度计
等臂天平2
2
Carbonate for an hour
Carbonate for an hour
Bubble in pure carbon dioxide fast enough to add the theoretical amount in about 30 minutes, and keep going at that rate for about 1 hour. The slurry ends at pH 9.85.
所需工具：
二氧化碳气体压力反应器搅拌器温度计
pH 指示剂试纸3
3
Filter and wash
Filter and wash
Filter the slurry and wash the cake twice with hot water.
此步骤所需材料：
水1 as required所需工具：
布氏漏斗（瓷制）
滤纸4
4
Acidify to pH 6.75
Acidify to pH 6.75
Stir the cake back into water and bring it to pH 6.75 with 400 ml of 3.5 N hydrochloric acid.
此步骤所需材料：
水1 as required所需工具：
盐酸
玻璃器皿搅拌器pH 指示剂试纸5
5
Wash out the chloride
Wash out the chloride
Filter again and wash the cake with hot water until it is nearly free of chloride.
此步骤所需材料：
水1 as required所需工具：
布氏漏斗（瓷制）滤纸6
6
Dry at 105 °C and grind
Dry at 105 °C and grind
Dry it at 105 °C in a fan oven and grind it to a fine powder. Allen's had a pH of 8.2, 0.61 % sodium and a surface area of 148 m² per gram.
所需工具：
干燥炉
研钵与研杵
带盖玻璃罐此蓝图制作
相关蓝图
这些蓝图共享知识——技术、材料或原理
CC0 公共领域
此蓝图以 CC0 协议发布。你可以自由复制、修改、分发和使用此作品，无需征得许可。
通过购买蓝图中的产品支持创客，他们将获得 创客佣金 （由供应商设定），或创建此蓝图的新版本并将其作为连接包含在你自己的蓝图中以分享收入。