The existing iron oxide red pigment production technology in my country is dry method and full wet method. The iron oxide pigments produced have their own advantages and disadvantages. Let’s not say much about the production method and the iron oxide produced by the alkali cycle method. What are the characteristics of red~
1. The dry process is relatively primitive iron oxide red pigment production process, which is suitable for preparing iron oxide red and iron oxide black powders from iron-bearing mineral deposits through beneficiation and grinding, which are used as low-end pigments. The total wet process is based on iron salt (ferrous sulfate, ferric sulfate, ferrous chloride, ferrous nitrate, etc.) solution or iron-containing waste acid as raw materials (when there is no iron salt solution or iron-containing waste acid, it can be used Sulfuric acid, nitric acid or hydrochloric acid is used to extract iron-bearing mineral deposits or iron-bearing solid waste to prepare iron salt solution), using a two-step oxidation method, namely, first oxidize to prepare seed crystals, and then oxidize seed crystals to prepare iron oxide red pigment.
2. The total wet process uses iron salt (ferrous sulfate, iron sulfate, ferrous chloride, ferrous nitrate, etc.) solutions or iron-containing waste acid as raw materials (when there is no iron salt solution or iron-containing waste acid, Sulfuric acid, nitric acid or hydrochloric acid can be used to leaching iron-bearing deposits or iron-bearing solid waste to prepare iron salt solution), using a two-step oxidation method, that is, first oxidizing to prepare seed crystals, and then oxidizing the seed crystals to prepare iron oxide red pigment.
Comprehensive comments on the existing production technology, the iron oxide red production process that can complete the comprehensive utilization of process wastewater is the ammonia neutralization method, but the promotion and use of the ammonia neutralization process requires first to deal with the stability of the production process and product quality, and process wastewater The low-cost comprehensive utilization of the production process, the control and utilization of waste gas in the production process and other issues. And the treatment of these problems requires a lot of research to discover and master the reaction mechanism and law of the iron oxide red pigment produced by the ammonia neutralization method, and on this basis, the research and development of the ammonia neutralization method iron oxide red production new production can achieve the above goals. Craftsmanship, new equipment.
2, the scope of technical application
The new process of producing iron oxide red pigment by alkaline recycling method has a very wide range of raw materials, including:
1. Iron-bearing mineral deposits, such as hematite, specularite, magnetite, etc.
2. Iron-containing waste residues and tailings, such as pyrite cinder, pickling iron oxide, iron-containing electroplating sludge, iron-containing tempering waste residue, iron-containing dust, iron-containing rare earth tempering waste residue, fly ash, coal gangue, asbestos Tailings, copper-zinc tempering waste residue, lead-zinc tempering waste residue, nickel refining waste residue, gold tempering waste residue, etc.
3. Iron-containing liquids, such as iron-containing waste acid, iron-containing wastewater, etc.
4. Soluble iron salts, such as ferrous sulfate by-product of titanium dioxide, ferrous chloride produced in steel rolling industry, etc.
