Where To Buy Magnesium Hydroxide Powder
5200 is a medium-density product specifically designed for rehydration from the powdered form to produce a smooth, viscous, nonseparating suspension. This is required for milk of magnesia (MoM) laxative systems. It is cost-effective for shipment anywhere in the world since it eliminates the cost of shipping water.
where to buy magnesium hydroxide powder
Technical-grade magnesium hydroxide slurries are relatively low viscosity aqueous suspensions used in wastewater treatment, flue gas desulfurization, heavy metal precipitation, paper bleaching and other industrial neutralization processes. The pharmaceutical-grade variety is the antacid and laxative commonly known as "milk of magnesia".
Wetting out and dispersing magnesium hydroxide powders to make a concentrated slurry can be challenging even with the aid of chemical dispersants. Inadequate mixing leads to issues like floating powders, long cycle times, and phase separation (very limited stability). One proven solution is to introduce the dry ingredients via sub-surface injection under high shear conditions as described in this bulletin.
The Ross Solids/Liquid Injection Manifold (SLIM) is ideal for fast and thorough dispersion of magnesium hydroxide powders into liquid. At the heart of this technology is a unique rotor/stator mixer designed to create a powerful vacuum that draws powders sub-surface and injects them into a high shear mixing zone.
Some magnesium hydroxide powders have a tendency to float when added from the top of the agitated liquid and sufficient vigorous mixing is required to achieve a smooth, uniform and stable dispersion. The SLIM is advantageous in the preparation of magnesium hydroxide slurries not only because it turns at high speeds but because of the way it introduces powders: solids and liquids are rapidly combined sub-surface at precisely the point where intense agitation takes place. Dispersion is virtually instantaneous; yet, the mixing action disperses agglomerates without changing the size and properties of individual particles. Floating powders and excessive dusting are also eliminated.
The SLIM technology is available in both batch and inline designs, making it simple to retrofit into most existing processes. During powder injection, liquid viscosity could be water-like or as high as 10,000 centipoise (cP). Solids loading is normally not a limiting factor; even concentrated magnesium hydroxide aqueous slurries (>60% solids by weight) are under 1,000 cP which a stand-alone SLIM Mixer can easily handle. More viscous paste-like formulations are processed in Multi-Shaft Mixers equipped with supplemental agitators in addition to the SLIM rotor/stator.
Ross also offers Ultra-High Shear Mixers for magnesium hydroxide slurries and pastes requiring more aggressive deagglomeration. These mixers deliver greater throughput and efficiency compared to colloid mills, media mills and other wet milling equipment.
Milk of magnesia is typically just a suspension of about $\pu8\%$ wt/v (i.e. $\pu8g / 100 mL$) magnesium hydroxide in water. To get a good suspension you will want to have very fine magnesium hydroxide. Ideally, it should feel like flour when rubbed between you fingers. Regardless, there will be some settling and you will need to shake it thoroughly prior to each usage. No other preparation should be necessary.
Magnesium Hydroxide HD is a spray-dried magnesium hydroxide powder for use in the manufacture of antacid preparations and mineral supplements. Different bulk densities offer a choice of compounding possibilities for tablet and powder dosage systems. Meets the requirements of USP, FCC, EP Pharmacopoeias and E528 (current edition) for Magnesium Hydroxide.
Magnesium hydroxide is, after aluminium hydroxide, the most widely used antacid active. The compound is used in both suspension and powder formulations, usually in combination with aluminium hydroxide. It has a high acid-binding capacity and reacts rapidly to neutralize gastric acid. The ingestion of pure magnesium hydroxide antacids leads to undesirably high pH values in the stomach, which can, in turn, stimulate acid production. For this reason it is recommended that magnesium hydroxide is combined with aluminium hydroxide in antacid formulations. Combination products also overcome the laxative effect of magnesium hydroxide as this is compensated for by the mild obstipative effect of aluminium hydroxide.
When comparing the physical and chemical properties of magnesium hydroxide with conventional alkalis, hydrated lime and caustic soda, see Table I, several differences are noted. The first is that fewer pounds of magnesium hydroxide are required to neutralize the same amount of acid, 37% more for caustic soda and 27% more for hydrated lime. Another unique characteristic, is the maximum pH obtainable during an overdosing situation. Excessive additions of caustic soda and hydrated lime will result in the pH of the waste stream reaching 14 and 12.5 respectively. However, due to the low solubility of magnesium hydroxide in water (0.009g/L), the pH of a magnesium hydroxide slurry is 10.5, and when used to neutralize acidic waste, will only obtain a pH of about 9.0, even when overdosed. This upper pH limit happens to coincide with the upper limit under the Clean Water Act, 1976.
As an example of the benefits of magnesium hydroxide, a large metal finishing operation located in Detroit, which operates zinc electroplating, chromate conversion coating, zinc phosphating and water bourne electroplating compared the use of magnesium hydroxide with caustic soda in their treatment plant. The effluent from the finishing process contains significant levels of dissolved zinc, iron and chromium, with minor levels of nickel, copper, lead, manganese and cadmium. The introduction of magnesium hydroxide significantly increased sludge particle density, improved filtration and produced better water quality. Tests showed that sludge volume was reduced by 60 percent. Filter press solids ranged from 27-50%, whereas with caustic soda they ranged from 15-30%. Settling rates were dramatically improved almost by a factor of ten times. Another benefit was the reduction of sulfuric acid usage caused by pH overshoots when using caustic soda.
Examination of the Material Safety Data Sheets for caustic soda and magnesium hydroxide will reveal some interesting differences. Magnesium hydroxide per SARA is a non-hazardous chemical. It is also not listed as a hazardous substance under 6NYCRR part 597, unlike caustic soda. This eliminates the necessity of containment walls or dikes, special handling equipment, and can be stored safely anywhere. It requires no special safety equipment. 041b061a72