Inorganic Salt Production Safety Technology

1. Production of inorganic salts from chemical ores. Such as the production of sodium dichromate with chromite. After the chromite ore is crushed, it is mixed with dolomite, calcium carbonate, soda ash, etc. in a certain proportion and sent to the rotary kiln, and roasted at high temperature to convert the chromium trioxide in the ore into sodium chromate. The reaction formula is as follows:
4(FeO·Cr2O3)+8Na2CO3+O2—→8Na2CrO4+2Fe2O3+8CO2
The charge is leached with water, neutralized to remove aluminum, evaporated, and sulfuric acid is added to convert sodium chromate into sodium dichromate. The reaction formula is as follows:
2NaClO4+H2SO4—→Na2Cr2O7+Na2SO4+H2O
The sodium dichromate solution is evaporated and crystallized to make a finished product.
2. Separation of inorganic salts from aqueous solutions. Such as the production of potassium chloride by decomposition and washing. Crush carnallite and add water to decompose it, then settle and centrifuge to obtain crude potassium, then dissolve it in water to remove sodium chloride, dehydrate and dry to obtain the finished product.
3. Synthesis of inorganic salts. Sodium bicarbonate can be produced from soda ash. Dissolve soda ash in water, filter out impurities, carbonize with carbon dioxide kiln gas, centrifuge, dry and pulverize to obtain the product. The reaction formula is as follows:
Na2CO3+CO2+H2O—→2NaHCO3
4. Preparation of inorganic salts by other methods. For example, potassium chlorate is prepared by electrolysis of sodium chloride. After the salt water is refined, it is electrolyzed, and then the potassium chloride in the electrolyte is double-decomposed to generate potassium chlorate. After the reaction liquid is cooled, the mother liquor is separated to obtain a crude product, and then recrystallized to obtain a finished product.