Potassium Sulfate

Specifications

Potassium Sulfate	Reagent grade A.R.	Reagent grade C.P.	Lucosamine special-purpose grade	Lucosamine low sodium grade	War industry grade	Gunpowder grade	Feed grade	Technical grade
Item	Index	Index	Index	Index	Index	Index	Index	Index
Assay（K2SO4）%	≥99.0	≥98.5	≥99.0	≥99.0	≥99.0	≥99.0	≥98.5	≥98.5
Water insoluble%	≤0.005	≤0.01	≤0.005	≤0.005	≤0.01	≤0.02	——	——
As%	≤0.0001	≤0.0005	≤0.0002	≤0.0001	≤0.0002	——	≤0.001	≤0.001
PH(50g/L,25℃)	5.0~8.0	5.0~8.0	5.0~8.0	5.0~8.0	6.0~8.0	6.0~8.0	——	——
Chlorides(Cl), %	≤0.0005	≤0.001	≤0.02	≤0.005	≤0.001	≤0.002	——	——
Total nitrogen(N) %	≤0.0005	≤0.001	≤0.0005	≤0.0005	–	–	–	–
Ca%	≤0.01	≤0.02	≤0.01	≤0.01	≤0.02	≤0.03	——	——
Heav metal(as Pb) %	≤0.0005	≤0.001	≤0.0005	≤0.0005	≤0.001	≤0.001	≤0.002	≤0.002
Fe%	≤0.0002	≤0.0005	≤0.0002	≤0.0002	≤0.0005	≤0.001	——	——
Na%	≤0.03	≤0.1	——	≤0.005	≤0.1	——	——	——
Fineness(40-80 meshes sieve)	——	——	Pass	Pass
Mg%	–	–	–	–	≤0.005	≤0.01	——	——
Fineness(120 meshes sieve)					——	≤5	40 meshes sieving rate≥95	——

 

Packing& Storage

Packing	In 25Kg/woven bag lined with double-layer plastic bag
Storage	20℃, 2 years.
Shipping	Room temperature in China; may vary elsewhere

 

General Information

1.1 Chemical & Physical Properties

Common Names	Potassium sulfate | Sulfuric acid dipotassium salt | Dipotassium sulfate
Structure
CAS　No.	7778-80-5			Boiling Point (℃)		1689°C
Molecular Weight	174.259			Melting Point (℃)		1067°C
Appearance	Colorless or white, hexagonal or orthorhombic crystalline or granular powder			Vapor Specific Gravity		N/A
HS Code	3105100090			Flash Point (℃)		1689°C
Solubility	Soluble in water, insoluble in ethanol, acetone and carbon disulfide			Autoignition Temperature (℃)		N/A

 

1.2 Safety Information

Safety Phrases	S22-S24/25
RIDADR	NONH for all modes of transport
WGK Germany	1
Packaging Group	N/A
Hazard Class	N/A

 

	SYMPTOMS	PREVENTION	FIRST AID
Inhalation	Cough. Sore throat.	Use local exhaust or breathing protection.	Fresh air, rest.
Skin	Redness. Burning sensation. Itching.	Protective gloves.	Remove contaminated clothes. Rinse and then wash skin with water and soap.
Eyes	Redness. Pain.	Wear safety goggles.	First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.
Ingestion	Abdominal pain. Nausea. Vomiting.	Do not eat, drink, or smoke during work. Wash hands before eating.	Rinse mouth. Induce vomiting (ONLY IN CONSCIOUS PERSONS!). Refer for medical attention .

 

1.3 Synthetic Route

1. The Mannheim method uses 98% sulfuric acid and potassium chloride to decompose at high temperature to generate potassium sulfate, a by-product hydrochloric acid.

2. Crystal separation method using Tongzi shell alkali or grass ash ash by roasting, leaching, filtration, concentration, centrifugal separation and drying to obtain potassium sulfate.

3. Alum stone reduction pyrolysis method crushes alum stone, roasts and dehydrates, and then decolorizes, leachs, desiliconizes, concentrates and separates crude potassium sulfate by decolorization, caustic soda solution, and obtains potassium sulfate products by refining.