Ultra-high performance and high purity biogenic silica filtration media
A silica and iron oxide technology, applied in filtration and separation, membrane filters, other chemical processes, etc., can solve problems such as low impurity efficiency, and achieve the effect of low unit consumption and high filtration performance
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[0153] Preparation method of ultra-high performance diatomite filter product / medium
[0154] Unlike typical diatomite manufacturing processes, which start with ore having a centrifuged wet density within the range of ores used to make conventional diatomite filtration products, the process for making the product / media of the present invention begins with a selection of The ore starts with an unusually low centrifugal wet density.
[0155] Another aspect of the ore selection of the present invention is the chemical composition of the raw ore. Due to the low centrifuge wet density ores used in the manufacture of the product / media of the present invention, there is greater flexibility in selecting ores which can have a higher density than those used in most commercial diatomaceous earth filtration products. High levels of impurities.
[0156] In one embodiment of the invention, the selected diatomaceous earth ore is derived from a lake, and preferably consists primarily or es...
Embodiment 1
[0338] Exemplary Ultra High Performance (Unpickled) Products / Media
[0339] Properties of an exemplary product obtained by adding 0.75% soda ash to the feed and calcining at 1093°C to obtain an ultra high filtration performance product / media are shown in Table 15. The centrifugal wet density of both product examples is about 0.172 g / ml (10.7 lb / ft 3), which is extremely low for these slow products / mediums with a permeability of about 89 mD to about 143 mD. The lower density provides a low consumption adjusted beer soluble iron and extractable metals factor which is also very low for this product / medium. The high silica specific volume is also a special feature of these products / mediums.
[0340] Table 15: Exemplary Products / Media of the Invention
[0341] Example A Example B 1 Permeability
143 89 SiO 2 (wt%)
89.42 89.57 Al 2 o 3 (wt%)
4.57 4.76 Fe 2 o 3 (wt%)
4.03 4.08 Na 2 CO 3 (wt%)
0.61 0.51 ...
Embodiment 2
[0348] Exemplary Ultra High Performance (Unpickled) Products / Media
[0349] Table 16 shows the properties of two examples of the ultra high performance product / media (not pickled) of the present invention prepared with 1.5% and 3.0% soda ash and at a calcination temperature of 1150°C with a permeability of 271 mDa West and 481 mD. The maximum centrifugal wet density is only 0.152g / ml (9.5lb / ft 3 ), any product below the prior art and any commercially available product of that product class. The specific volume of silica is about 6, which is unusually high for these products / mediums. Consumption adjusted beer soluble iron was only 5ppm and 12ppm, which is very low for these unpurified diatomaceous earth products / media. Both product examples showed similar low extractable metals factors.
[0350] Table 16: Exemplary Products / Media of the Invention
[0351] Example A Example B 1 Permeability
271 481 SiO 2 (wt%)
89.23 89.61 al 2 o 3 ...
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Abstract
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