How is caustic soda diluted, that is, water or alkali first

The dilution method of caustic soda is different, and the caustic soda should be put into a basin and then rinsed with boiling or hot water. If caustic soda is thrown directly into the water, even if it is cold, the water will boil and even splash and injure people, because caustic soda will release a lot of heat energy when it meets water. Therefore, the correct dilution of chemicals not only ensures their efficacy, but also affects personal safety and washing safety.

The main reason for considering the order is to make it easier for the liquid to dissipate heat, so it is generally poured in the less dense one first, and then the denser one is poured in, so that the liquid will not boil because the heat dissipation is too slow.

Water, caustic soda and water are too intense.

1. In the production and use places, operators must wear protective glasses, rubber gloves and rubber boots to prevent lye or solid caustic soda fragments from touching the eyes and causing burn accidents.

2. In view of the characteristics of the heat of dissolution of caustic soda, flake soda.

When a solution is to be diluted or prepared, alkali should be added to water; The operator must slowly add the alkali to the vessel during operation to prevent a sharp exothermic reaction.

and burn accidents.

3. The stored flake alkali should be used on a first-come, first-served basis, and the storage time should be shortened as much as possible to avoid moisture absorption and agglomeration.

4. If the storage time is too long, the main content of caustic soda remains unchanged under the condition that the packaging bag is intact, and the use effect will not be affected after crushing.

Caustic soda solution application field:

In the metallurgical industry, it is often necessary to convert the active ingredients in the ore into soluble sodium salts in order to remove the insoluble impurities, so soda ash is often added.

It is again a flux), and sometimes caustic soda is also used.

For example, cryolite is used in the smelting process of aluminum.

of preparation and bauxite.

Soda ash and caustic soda are used in the treatment. For example, when smelting tungsten, the concentrate and soda ash are first roasted into soluble sodium tungstate.

After that, powdered tungsten is prepared by acid precipitation, dehydration, reduction and other processes.

The above content refers to Encyclopedia - Sodium Hydroxide.

1. Not necessarily. Caustic soda is sodium hydroxide, which is easily soluble in water and does not need to be dissolved with hot water, it can be dissolved in cold water. Caustic soda dissolves in water and exothermic more, so that the water temperature rises, and it feels a little hot, if the caustic soda is opened with hotter water, the boiling phenomenon of the water temperature may be too high, so that the strong corrosive caustic soda solution splashes out, causing burns, so be careful, it is best not to use hot water.

If it really needs to be dissolved quickly, warm water can be used.

2. Caustic soda generally refers to sodium hydroxide, sodium hydroxide, also known as caustic soda, caustic soda, solid soda, caustic soda, caustic soda. Sodium hydroxide has strong alkaline and strong corrosiveness, and can be used as acid neutralizer, masking agent, precipitant, precipitation masking agent, chromogenic agent, saponifying agent, peeling agent, detergent, etc., and has a wide range of uses. There are two methods for industrial production of sodium hydroxide: causticizing and electrolysis.

The causticizing method is divided into soda ash causticizing method and trona causticizing method according to different raw materials; The electrolysis method can be divided into the separator electrolysis method and the ion exchange membrane method.

Put alkali first. Because caustic soda is easily soluble in water, if you put water first and then put caustic soda, it will make the water boil and splash and hurt people, so it is necessary to put caustic soda first. Caustic soda actually refers to sodium hydroxide, which has strong alkali code initiation and can be used as acid neutralizer, precipitant, peeling agent, detergent, etc.

In addition, caustic soda generates a high amount of heat when dissolved in water, so wear goggles and rubber gloves when operating. <

Caustic soda is put in alkali first. Because caustic soda is easily soluble in water, if you put water first and then put caustic soda, it will make the water boil and splash and hurt people, so it is necessary to put caustic soda first. Caustic soda actually refers to sodium hydroxide, which has strong alkalinity and can be used as a jujube trembling agent, precipitant, peeling agent, detergent stool mold failure, etc.

In addition, caustic soda generates a high amount of heat when dissolved in water, so wear goggles and rubber gloves when operating.

The correct way to store caustic soda is to store various forms of caustic soda in barrels, such as liquid, flake, liquid caustic soda. When the temperature is around 12, the liquid caustic soda will solidify, and the storage temperature should be kept above 12 to ensure its normal use.

The double packaging and storage of flake caustic soda should ensure the tightness of the package and should not leak. Store in a highly dry warehouse or shed to prevent rainwater from ingressing. The stacking place should be kept away from flammable, combustible and acid materials.

Caustic soda can damage wool and leather clothing. Therefore, remember to wear protective tools, coveralls, hats, and gloves when exposed to flake caustic soda. Ventilation is required. The maximum concentration of caustic soda in the room is 2 mg m3.

The above is the correct storage method of caustic soda. Caustic soda can be applied to many industries. It is difficult to buy and store in large quantities.

Caustic soda, whose scientific name is sodium hydroxide, should be stored in a cool, dry and well-ventilated warehouse. Keep away from fire and heat sources. The storage temperature should not exceed 35, and the relative humidity should not exceed 80%.

The package must be tightly sealed and never get wet. It should be stored separately from flammable (combustible) materials and acids, and should not be mixed. The storage area should be equipped with suitable materials to contain the spill.

There are two methods for industrial production of sodium hydroxide: causticizing method and electrolysis method, and the causticizing method is divided into soda ash causticizing method and trona causticizing method according to different raw materials; The electrolysis method can be divided into the separator electrolysis method and the ion exchange membrane method.

Caustic Soda: Storage:

Keep away from flammable and combustible materials. Avoid dust generation. Avoid contact with acids.

When handling, it is necessary to load and unload lightly to prevent damage to the packaging and containers. Equipped with emergency equipment for spill treatment. Empty containers may leave harmful substances behind.

When diluting or preparing the solution, the alkali should be added to the water to avoid boiling and splashing. To deal with spills, wear protective glasses and gloves, sweep them up, slowly pour them into a large amount of water, rinse them with water on the ground, and put the diluted sewage into the wastewater system.

Emergency measures for endangering personal safety:

If the lye touches **, it can be cleaned with 5 10% magnesium sulfate solution; If it splashes into the eyes, it should be washed immediately with a large amount of aqueous boric acid solution; When a small amount is ingested, it should be neutralized immediately with vinegar, 3 5% acetic acid or 5% dilute hydrochloric acid, a large amount of orange juice or lemon juice, etc., and the egg white, milk or vegetable oil should be drunk and medical attention should be sought quickly, and vomiting and gastric lavage are contraindicated.

Solid sodium hydroxide can be packed into millimeter-thick steel drums and tightly sealed, and the net weight of each barrel does not exceed 100 kg; plastic bags or two-layer kraft paper bags with full or medium opening steel drums; Ordinary wooden boxes outside screw-mouth glass bottles, iron-capped glass bottles, plastic bottles or metal barrels (cans); Screwed glass bottles, plastic bottles or tinned thin steel plate barrels (cans) with full bottom plates, lattice boxes, fiberboard boxes or plywood boxes; Tinned thin steel sheet drums (cans), metal drums (cans), plastic bottles or corrugated boxes with metal hoses. The packaging container should be complete and sealed, and should have a clear "corrosive substance" mark. When transporting by rail, steel drum packages can be transported in open cars.

The packaging should be complete and the loading should be secure when it is shipped. During transportation, it is necessary to ensure that the container does not leak, collapse, fall, or be damaged, and is moisture-proof and rainproof. If it is found that the packaging container is rusted, cracked, holes, melted and dripping water, etc., the packaging should be replaced immediately or shipped as soon as possible, and the container damage can be repaired by soldering.

It is strictly forbidden to mix and transport with flammable or combustible materials, acids, edible chemicals, etc. During transportation, the transport vehicle should be equipped with leakage emergency treatment equipment. It shall not be stored and mixed with flammable materials and acids.

In the event of a fire, water, sand and various fire extinguishers can be used to extinguish the fire, but firefighters should pay attention to the corrosiveness of caustic soda dissolved in the water.

Store tightly sealed and dry. (i.e. cannot be left open.) The air contains water vapor (H2O) and carbon dioxide (CO2), and NaOH is easily deliquescent by water vapor and reacts with carbon dioxide to form sodium carbonate (Na2CO3), which will also deteriorate.

Sodium hydroxide (caustic soda) storage precautions:

Store in a highly dry warehouse or shed to prevent rainwater from ingress. Stacking place.

Keep away from flammable, combustible and acids. The packaging should be sealed intact.