Method of using cement kiln intermediate product for harmless disposal of electrolytic manganese slag

Abstract

The invention relates to an industrial waste disposal technology, in particular to a method of using a cement kiln intermediate product for harmless disposal of electrolytic manganese slag. High-temperature airflow is produced in a production process of a cement kiln and has the advantages of a large capacity, high temperature, long residence time, an oxidizing atmosphere and the like; high-alkaline material is an alkaline material which is about to enter the kiln in the production process of cement and has high CaO content and high activity. According to the method, the high-temperature airflow and high-alkaline material are creatively used for the harmless disposal of environmentally harmful elements and components such as residual acid, soluble manganese and ammonia nitrogen in the electrolytic manganese slag to control and reduce a harmful effect of the electrolytic manganese slag on the atmosphere, water, soil and other environments and the occupational health of employees duringdownstream application. After the harmless disposal, the electrolytic manganese slag can be widely used in the fields of cement bifunctional materials, wall materials, road surface materials, concrete aggregates and the like.

Description

technical field [0001] The invention relates to industrial waste treatment technology, in particular to a method for harmlessly treating electrolytic manganese slag by utilizing cement kiln intermediate products. Background technique [0002] Electrolytic manganese slag is the acid waste residue produced after manganese carbonate ore undergoes acid leaching, neutralization and pressure filtration processes in the electrolytic manganese production process. The main pollutants are soluble heavy metal ions, residual acid and ammonia nitrogen. Resource pressure causes pollutants to infiltrate into the surrounding water and soil with surface runoff, polluting the environment and causing waste of resources, and also causing pollutants to migrate in the environment, directly or indirectly causing harm to the human body through the food chain. Therefore, electrolytic manganese The safe disposal and resource utilization of slag are imminent. [0003] For example, the patent No. CN20...

AI Technical Summary

Problems solved by technology

[0006] At present, it is difficult for electrolytic manganese slag to meet the requirements of complete removal of soluble manganese and ammonia nitrogen insolubles by washing with water and adding alkaline agents. At the same time, ammonia pollution, product return frost and manganese Problems such as exceeding the standard

Although manganese exceeding the standard can be solved by reducing the dosage and expanding the scope of use, the problems such as serious ammonia pollution and product frost return cannot be effectively overcome due to the difficulty in completely removing ammonia nitrogen in the electrolytic manganese slag;

[0007] Some studies add about 10-15% of quicklime, and by prolonging the stirring and compounding reaction time, the ammonia nitrogen in the electrolytic manganese slag is removed in the form of ammonia gas, but ammonia gas is an odorous gas, and the national emission standards for such odorous gases are extremely strict , resulting in high cost of ammonia-containing tail gas treatment; other studies have shown that the use of "struvite" to remove ammonia nitrogen in electrolytic manganese also faces problems such as long process routes, large investment, and high operating costs.

Images