7446-20-0 Usage
Uses
Used in Textile Industry:
Zinc sulfate heptahydrate is used as a mordant dyeing agent for calico printing, which helps to fix dyes onto fabrics and prevent them from running.
Used in Wood Preservation:
It is used as a wood preservative to protect wood from decay, fungi, and insects.
Used in Paper Industry:
Zinc sulfate heptahydrate is used as a paper bleaching agent, which helps to whiten paper and improve its brightness.
Used in Medicine:
It is used in the preparation of zinc medicine, astringents, and as a dietary supplement for zinc, which is essential for various biological processes, including enzyme function, protein synthesis, and carbohydrate and fat metabolism.
Used in Synthetic Fibers:
It is mainly used as a coagulating agent in the production of rayon and as a mordant in calico printing.
Used in Electrolysis and Electroplating:
Zinc sulfate heptahydrate is used as an electrolyte for zinc plating and surface treating agents.
Used in Pesticides and Zinc Production:
It is used in the production of pesticides and as a source of zinc in the manufacturing of zinc-containing catalysts, inorganic pigments (e.g., lithopone), and other zinc salts (e.g., zinc stearate, basic zinc carbonate).
Used in Food Industry:
Zinc sulfate heptahydrate is allowed for use in food supplements of zinc in various products such as salt, foods for infants and young children, dairy products, grains and their products, and liquid and drink milk drinks.
Used in Pharmaceutical Industry:
It is used as an emetic and for preventing diseases in fruit tree nurseries and cable manufacturing zinc fertilizer.
Used in Cosmetic Industry:
Zinc sulfate heptahydrate is used as a cosmetic astringent and biocide, which can cause irritation to the skin and mucous membranes and may cause an allergic reaction.
Used in Analytical Chemistry:
It is used as an analytical reagent, mordant, and phosphor matrix.
Used in Preparation of Complexometric Titrant:
Zinc sulfate heptahydrate is used in the preparation of complexometric titrant, which is a type of titrant used in complexometric titration, a method for determining the concentration of certain metal ions in a solution.
Used in Clarifying and Preserving Agents:
It is used as a clarifying and preserving agent for leather, bone glue, and other materials.
Used as a Nutritional Supplement:
Zinc sulfate heptahydrate can be used as a nutritional supplement (zinc enhancer) in food-grade products.
Outline
At room temperature, zinc sulfate heptahydrate is white particles or powder, it is orthorhombic crystal, it has convergence, it is common astringent, it will weathering in dry air. When be heated 30℃, it can lose a part of crystal water, at 100℃ it loses six crystal water molecules, it loses seven crystal water molecules at 280℃, it decomposes into zinc oxide and sulfur trioxide at 767℃. It is soluble in water, slightly soluble in ethanol and glycerol. It requires confined preservation. It is mainly used as raw material for the production of zinc, barium and other zinc saline, it is also important auxiliary raw material for the viscose fiber and vinylon fiber, it can be also used as mordant dyeing, leather and wood preservative, glue clarifying and preserving agents, medical emetic and fungicides, it can be used for trace element fertilizers on agriculture.
Toxicity
Referrence zinc sulfate monohydrate.
Waste battery preparation
The zinc skin of battery is peeled off and washed, then it is put into a beaker, it is cut into small pieces, add water, add concentrated sulfuric acid, properly be heated. If zinc skin dissolves completely, then adds zinc skin, zinc skin is generally control slight excess, this is better handled. Zinc sulfate solution is heated to evaporate, zinc sulfate heptahydrate is crystallized out, it is dried at 120℃, and then dried finished product can be obtained.
Production method
(1) Synthesis method: 18% sulfuric acid was added into to dissolve the dross of dilute solution in reactor, with stirring zinc oxide (or zinc raw material) was added to adjust slurry. Then adds sulfuric acid, the reaction occurs in a stirred acidproof reactor, Ph is controlled at 5.1, it is the end of the reaction, concentration is about 38°Bé. The reaction is filtered, it is heated to 80℃, the addition of zinc to displace copper, cadmium, nickel, then it is filtered, and the filtrate is heated to above 80℃, potassium permanganate (or bleach) is added and heated to boil, the impurity of iron oxide, manganese is oxidated, it is filtered and the filtrate was clarified, then it is evaporated to 49~52 ° Bé, it goes through cooling and crystallization, centrifugal dewatering, drying to obtain zinc sulfate heptahydrate. its
ZnO + H2SO4 → ZnSO4 + H2O
(2) Zinc material is slowly added into diluted sulfuric acid which the relative density is 1.16, temperature is controlled at 80~90℃, after about 2h, Ph value of solution is 5.1 to 5.4, after reaction, the relative density of solution is about 1.35; and then adds small amount of high manganese bleach or potassium, iron, manganese oxide precipitation, filtration spoil the ,filtrate is put into the replacement bucket, then adds small amount of zinc powder and it is stirred at 75~90℃ for 40~50min, replacement of heavy metals copper, lead, cadmium and other impurities. After filtration, the filtrate is oxidated by small amount of bleach or potassium permanganate, further removes small amounts of iron, manganese, and it is filtered to get zinc sulfate solution which relative density is 1.28 to 1.32. This solution is cooled in the crystallizer kettle crystalline for 2~3d, after fractional crystallization, dry finished product is obtained which spin-dried at 40~50℃.
ZnO + H2SO4 → ZnSO4 + H2O
(3) Zinc material is slowly added into diluted sulfuric acid which the relative density is 1.16, temperature is controlled at 80~90℃, after about 2h, Ph value of solution is 5.1 to 5.4, after reaction, the relative density of solution is about 1.35; and then adds small amount of high manganese bleach or potassium, iron, manganese oxide precipitation, filtration spoil the ,filtrate is put into the replacement bucket, then adds small amount of zinc powder and it is stirred at 75~90℃ for 40~50min, replacement of heavy metals copper, lead, cadmium and other impurities. After filtration, the filtrate is oxidated by small amount of bleach or potassium permanganate, further removes small amounts of iron, manganese, and it is filtered to get zinc sulfate solution which relative density is 1.28 to 1.32. This solution is cooled in the crystallizer kettle crystalline for 2~3d, after fractional crystallization, dry finished product is obtained which spin-dried at 40~50℃.
Safety Profile
Human poison by an
unspecified route. Poison experimentally by
subcutaneous, intravenous, and
intraperitoneal routes. Moderately toxic by
ingestion. Experimental reproductive
effects. When heated to decomposition it
emits toxic fumes of SOx and ZnO. See also
ZINC SULFATE.
Check Digit Verification of cas no
The CAS Registry Mumber 7446-20-0 includes 7 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 4 digits, 7,4,4 and 6 respectively; the second part has 2 digits, 2 and 0 respectively.
Calculate Digit Verification of CAS Registry Number 7446-20:
(6*7)+(5*4)+(4*4)+(3*6)+(2*2)+(1*0)=100
100 % 10 = 0
So 7446-20-0 is a valid CAS Registry Number.
InChI:InChI=1/H2O4S.7H2O.Zn/c1-5(2,3)4;;;;;;;;/h(H2,1,2,3,4);7*1H2;/q;;;;;;;;+2/p-2
