Ferrous chloride is an inorganic substance with the chemical formula FeCl2. Green to yellow. Soluble in water, ethanol and methanol. There is tetrahydrate FeCl2·4H2O, which is a transparent blue-green monoclinic crystal. Density 1.93 g/cm3, easy to deliquesce, soluble in water, ethanol, acetic acid, slightly soluble in acetone, insoluble in ether. Anhydrous ferrous chloride is a yellow-green hygroscopic crystal that forms a light green solution when dissolved in water. Tetrahydrate salt turns into dihydrate salt when heated to 36.5°C
reducing agent. Detect Selenium. Sewage treatment agent.
It is directly used in sewage and wastewater treatment. As a reducing agent and mordant, it is widely used in fabric printing and dyeing, pigment dyeing, manufacturing and other industries. It is also used in ultra-high pressure lubricating oil components, and is also used in medicine, metallurgy and photography.
Ferrous chloride has unique decolorization ability and is suitable for wastewater treatment in dye intermediates, printing and dyeing, and papermaking industries. It can simplify the water treatment process, shorten the water treatment cycle, and reduce water treatment costs; it has obvious treatment effects on various types of sewage, electroplating, leather, and papermaking wastewater, and the removal rate of various heavy metal ions in wastewater and sewage is close to 100%; treatment The cost is low and it is an ideal agent for sewage treatment. It is directly used in sewage and wastewater treatment. As a reducing agent and mordant, it is widely used in fabric printing and dyeing, pigment printing and dyeing, manufacturing and other industries. It is also used in ultra-high pressure lubricating oil components, and is also used in medicine, metallurgy and photography. In addition, it has the following important uses:
1. Production of ferric chloride
Use ferrous chloride solid hydrochloric acid and chlorine gas as the main raw materials to produce ferric chloride. First, mix the ferrous chloride into a solution, heat it and pass in chlorine gas to obtain a ferric chloride solution. If the ferric chloride solution is filtered , heating, chlorine or nitrification, concentration, and cooling to obtain solid ferric chloride hexahydrate. Ferrous chloride reacts completely to transform into ferric chloride.
2. Production of solid polyferric chloride
(1) Put ferrous chloride crystals into the reaction kettle, add water and slowly heat it to 45-65°C, start the reactor stirrer, and pass compressed air at the bottom of the reaction kettle. Stop heating when the temperature reaches 85-95°C.
(2) Add alkaline solution to the upper part of the reaction kettle for reaction, add hydrochloric acid aqueous solution under the reactant liquid level, control the temperature at 90~95°C, and stop adding when Fe↑[2+] ≤ 0.15% is detected in the reactant. Alkali solution, when the salinity reaches 5 to 10%, stop adding the hydrochloric acid aqueous solution, stir, add compressed air, press the material into the tablet making machine while it is hot, and cool it into a solid. After crushing, it becomes high-content solid polyferric chloride. Application The solid polyferric chloride produced by the invention has stable quality, low cost, good product stability, no three wastes are generated in the production process, and the product has no hidden danger of secondary pollution.
3. Production of polyaluminum ferric chloride flocculant (PAFC)
An inorganic polymer flocculant produced based on aluminum salt and iron salt flocculants.
4. Method for high-quality treatment of printing and dyeing wastewater with ferrous chloride waste liquid
A method of high-quality treatment of printing and dyeing wastewater with ferrous chloride. By adding polar media to the printing and dyeing wastewater and changing the ionization degree, FeCl2 is used. The treated printing and dyeing wastewater treatment solution can also be mixed with 1-2 times the amount of untreated printing and dyeing wastewater, and then adjust the pH value to neutralize, coagulate and settle, and discharge after solid-liquid separation. The COD removal rate of the wastewater is ≥50%. The chroma removal rate is 70-90%, the effluent does not turn red, and the cost of wastewater treatment is saved by about 30%. FeCl2 is widely used in printing and dyeing wastewater treatment to create conditions that can produce good environmental and economic benefits.
It has obvious treatment effects on various types of sewage, electroplating, and leather wastewater. The removal rate of various heavy metal ions in wastewater and sewage is close to 100%. It has unique decolorization capabilities and is suitable for wastewater treatment in dyes, dye intermediates, and printing and dyeing industries. . It can simplify the water treatment process, shorten the water treatment cycle, and reduce water treatment costs.
5. Produce erasable ink
It is made by mixing inorganic salts with color dyes. The formula is sodium polyacrylate, ferrous chloride, cobalt sulfate, sodium sulfate, color dyes and water. The color dyes can be black, blue, green, and red respectively. And other pigments. Words written with this kind of ink are easy to erase with an ordinary eraser. After the writing dries, it is not easy to change color and can be stored for a long time.
6. Quick curing agent for silt sandy soil slopes
Ferrous chloride + calcium hydroxide has greater pressure resistance: 40-50kpa (28 days) 4-5 times stronger.
7. Ferrous chloride additive water mist fire extinguishing agent
In order to improve the fire-extinguishing effectiveness of conventional water mist and expand its application scope, this article uses small-scale experimental methods to study the effectiveness of water mist containing ferrous chloride additives in extinguishing pool fires under different fuel types, additive concentrations, and pressures. sex. Experimental results show that adding ferrous chloride to fine water mist significantly affects its fire-extinguishing performance; the fire-extinguishing time of fine water mist changes with the mass concentration of added ferrous chloride, and there is a minimum Fire extinguishing time concentration; the working pressure of the water mist nozzle and the type of fuel also have an impact on the fire extinguishing performance of the fine water mist. The greater the working pressure of the nozzle, the shorter the average fire extinguishing time of the fine water mist; under the same experimental conditions, the fine water mist fire extinguishing time is shorter. The time it takes to put out a kerosene fire with water mist is shorter than the time it takes to put out an ethanol fire.
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