What are the applications of hydrated magnesium silicate?

Magnesium silicate hydrate ultrafine powder properties

White to off-white powder. The main component of talc is aqueous magnesium silicate, the chemical molecule is Mg3 [S14 010] (OH)2, which belongs to the layered silicate mineral structure. Relative density 2.75. The texture is soft and smooth. Ultra-fine talc can maintain the layered structure of natural talc, and at the same time, the dispersion and whiteness are significantly improved, and the reinforcing property is better. Talc has many characteristics such as chemical stability, high melting point, large specific heat, low thermal conductivity, low conductivity, low shrinkage, strong oil absorption ability and acid and alkali resistance.

Hydrated magnesium silicate standard

This series of talc is made by cleaning, crushing, flotation and drying. The main component is Mg3Si4010(0H)2. This product contains magnesium (Mg) should be 17.0% ~ 19.5%.

Ultrafine magnesium silicate powder preparation method

The talc ore is sent to the hammer crusher for coarse crushing, and the broken product is sent to the vertical dryer for drying by the bucket elevator and vibration feeder. After drying, the product is crushed by hammer mill. Medium crushed products from the feed hopper into the mill for grinding, ground material is transported to the air mill, ultrafine grinding, the fineness of 500 ~ 5000 mesh products.

Magnesium silicate hydrate ultrafine powder properties

This product is white or white like, no sand fine powder, has a slippery feeling. This product is insoluble in water, dilute hydrochloric acid or 8.5% sodium hydroxide solution.

Hydrated magnesium silicate applications

Used AS THE filler of plastic, improve the processing performance, improve the mechanical strength, heat resistance and tensile strength of products, used in plastic film can increase the transmittance of plastic film to scattered light. Adding talcum powder, paint, coating can improve the dispersion, fluidity and gloss, coating resistant to sunlight, high temperature resistance, no discoloration under uv irradiation, can keep the original luster and color for a long time, has good resistance to acid and alkali corrosion performance, and good water resistance, strong pollution resistance, aging resistance, abrasion resistance, resistant to steam and chemical stability, and has strong flame retardant performance, In addition, it can replace some titanium dioxide. Talc is also used as textile filler and whitening agent; Medicine and food carrier, additives, etc.

Magnesium silicate identification

1. Take 0.2g of this product, put it in a platinum crucible, add the same amount of calcium fluoride or sodium fluoride powder, stir, add 5ml sulfuric acid, slightly hot, immediately cover the cover of the platinum crucible suspended with 1 drop of water, wait for a moment, remove the cover of the platinum crucible, the water drops appear white turbidized.

2. Take 0.5g of this product, put it in a beaker, add 10ml of hydrochloric acid solution (4-10), cover the surface dish, heat it until it is slightly boiling, shake the beaker from time to time, and keep it slightly boiling for 40 minutes, remove it, filter it with quick filter paper, and wash the filter residue 4 ~ 5 times with water. Add 10 drops of sulfuric acid solution (1-2) and 5ml hydrofluoric acid to the platinum crucible, heat to the white smoke of sulfur dioxide, remove, cool, add 10ml water to dissolve, take 2 drops of the solution, add magnesium reagent (take the p-nitrobenzene azo-chiphenyl O.LG, add 1000ml 4% sodium hydroxide solution to dissolve, Get) 1 drop, add 40% sodium hydroxide solution to make alkaline, to produce sky-blue precipitate.

3. The infrared light absorption map of this product should be in 3677MIT1 shi 2cm 1 1 1018cm - 1 ±2cm_1, 669cm - 1 shi 2cm_1 wave number has characteristic absorption (general rule 0402).

Magnesium silicate hydrate ultrafine powder determination of content

Take about O.G of this product, weigh it accurately, put it in a Teflon container, add LML of hydrochloric acid, LML of lead-free nitric acid and LML of high gas acid, stir and shake well, add 7ml of hydrofluoric acid, steam it slowly on a heating plate until it is nearly dry (about 0.5ml), add 5ml of hydrochloric acid to the residue, heat it to boiling, cool it, transfer it to a 50ml bottle with water, dilute it to calibration. Shake well, as the test product storage liquid. 

For precision measurement, take 2ml of the storage solution and put it in a 50ml measuring bottle, dilute it with water to the scale, and shake it well. For precision measurement, take 2ml of the storage solution and put it in a 100ml measuring bottle, dilute it with mixed solution (10ml of hydrochloric acid and 10ml of 8.9% lanthanum chloride solution, add water to 100ml) to the scale, and shake it well, then use it as the test solution. 

An appropriate amount of magnesium standard solution was diluted with water to make 10ug, 15ug, 20ug and 25ug of magnesium in each LML. 2mL of each precision solution was divided into 100ml measuring bottles, diluted with the mixed solution to the scale, shaken well, and used as reference solution. The blank solution, test solution and reference solution were measured at 285.2nm wavelength by atomic absorption spectrophotometry (the first method of General Rule 0406) and calculated by standard curve method.

Magnesium silicate hydrate ultrafine powder storage

Store in a dry place.