Sodium Sulphide Red Flakes 60% Na2s

SPECIFICATION

Model	10PPM	30PPM	90PPM-150PPM
Na2S	60% min	60% min	60% min
Na2CO3	2.0% max	2.0% max	3.0% max
Water  Insoluble	0.2%max	0.2%max	0.2%max
Fe	0.001%max	0.003%max	0.008%max-0.015%max

usage

Used in Leather or tanning for removing hair from hides and skins.

 used in synthetic organic intermediate and preparation of sulfur dye additives .

In textile industry as a bleaching, as a desulfurizing and as a dechlorinating agent

used in pulp and paper industry.

Used in water treatment as an oxygen scavenger agent.

Used in mining industry as inhibitor , curing agent , removing agent

OTHER USED

♦ In the photographic industry to protect developer solutions from oxidation.
♦ It is used in the production of rubber chemicals and other chemical compounds.
♦ It is use in other applications include ore flotation, oil recovery, food preservative, making dyes, and detergent.

Preparation method

1. Coal powder reduction method: Mix mirabilite and coal powder in a ratio of 100: (21-22.5) (weight ratio) and calcine and reduce at a high temperature of 800-1100℃. After cooling, the product is dissolved in a dilute alkali solution to form a liquid. After standing and clarifying, the upper concentrated alkali solution is concentrated to obtain solid sodium sulfide. After the transfer tank and flake (or granulation) are used to obtain the flake (or granular) sodium sulfide product

Chemical reaction equation: Na2SO4+2C→Na2S+2CO2

2. Absorption method: use 380-420 g/L sodium hydroxide solution to absorb hydrogen sulfide waste gas containing H2S>85%. The resulting product is evaporated and concentrated to obtain sodium sulfide finished product.

Chemical reaction equation: H2S+2NaOH→Na2S+2H2O

3. Barium sulfide method: Sodium sulfide can be produced as a by-product when sodium sulfate and barium sulfide are subjected to double decomposition reaction to precipitate barium sulfate.

Its chemical reaction equation: BaS+Na2SO4→Na2S+BaSO4↓

4. Gas reduction method: In the presence of an iron catalyst, hydrogen (or carbon monoxide, producer gas, methane gas) is reacted with sodium sulfate in a boiling furnace to produce high-quality anhydrous granular sodium sulfide (containing 95% to 97% Na2S).

Chemical reaction equation:

Na2SO4+4CO→Na2S+4CO2

Na2SO4+4H2→Na2S+4H2O[3]

5. Production method: The refining method uses the sodium sulfide solution with a concentration of about 4% as a by-product in the production of precipitated barium sulfate as raw material. It is pumped into a double-effect evaporator to be concentrated to 23%, and then sent into a stirring tank for iron removal and carbon removal. It is then pumped into an evaporator (made of pure nickel) to evaporate the alkali solution to a certain concentration, and then sent to a drum water-cooled tablet making machine for production. After screening and packaging, the finished product is obtained.