The article describes a method of briquetting dusts containing non-ferrous metals. The proposed method is aimed at solving the environmental problem of mining and metallurgical enterprises and allows to take valuable components additionally. In experiments the influence of additive, humidity and pressing pressure on the strength of briquettes is investigated.
Environmental tension in coal-mining regions of the country is largely determined by the high level of coal production waste. And a significant part of waste is represented by fine fraction 0-3mm of coals, formed in the process of mining, during preparation, transportation, storage, etc. It is difficult to reduce the level of coal losses in the form of slimes and fines by direct combustion due to the complexity of loading and transportation, as well as the combustion process itself. Therefore, this product must be pelletized. The most accessible, studied and technically prepared method of coal fines pelletizing is the briquetting method. Experiments on briquetting of coal fines with the use of clay and starch as binding materials have been carried out.
The results of briquetting of rich iron ore without binder additives are presented. The dependencies that can be used in briquetting with binder additives are established. The influence of ore particle size distribution, moisture content, pressing pressure, and additives of different size classes on the strength properties of briquettes is studied.
Currently, almost all iron oxide pigments production is located in the neighboring countries. Besides, the used technologies of pigments production are environmentally harmful. Development of ecologically safe technology for obtaining pigment grade ore is a priority and quite actual task for the paint and varnish industry of Russia.
The mined ore cannot be used in the metallurgical process without preliminary preparation. The main preparatory operation is ore size preparation. Small ore fractions (-5+0 mm) are carried out of the furnace during smelting and smelting becomes inefficient. Therefore, it is necessary to exclude fine ore grades and direct them to roasting. In this paper, loose iron ores were investigated and the feasibility of roasting this product was determined. The initial moisture content of the dough, the content of different grades of coarseness and elemental composition were studied by spectral and chemical method.
Currently, the principles of crushing and grinding used in the comparative evaluation of the processes of crushing and grinding are well known. Since the process of briquetting is conventionally opposite to the process of crushing, we decided to create a theory opposite to the processes of destruction of particles. In our work we will try to explain why briquetting laws are needed and what practical effect they will bring.
