Increasing the efficiency of secondary resources in the mining and metallurgical industry

Abstract

An improved methodology is presented for assessing the economic feasibility and effectiveness of recycling industrial waste. The methodology is based on the break-even control mechanism, but at the same time provides for the introduction of new evaluation criteria such as the threshold of conditionality and the degree of ore substitution. Based on an improved analysis, it becomes possible to more precisely predict recycling efficiency. A more refined determination of the lower limit of concentration of recoverable metals, at which technogenic waste can be assigned the status of secondary raw materials and processed profitably, leads to a significant expansion of the secondary raw material base suitable for recycling. The potential for recycling manganese-containing dust from the production of ferrosilicomanganese, dehydrated sludge from the hydro separation of slags, and cake from the production of electrolytic manganese dioxide at the Chiatura mining enterprise is used as an example. It is shown that with a threshold of -24% Mn content, the highest recycling efficiency can be achieved by the production of low-phosphorus manganese slag and conversion to ferrosilicomanganese using the above waste to replace 40-60% grade III and IV manganese concentrates in the feed.

Hydrated aluminum powder for direct alloying of steel and alloys - challenges of the future

“…The task of reducing the specific consumption of expensive ferroalloys and ligatures in need of scarce ores is acute for modern electrometallurgy of steel and alloys [1,2]. The noted problem, in the future, will gradually become even more aggravated due to the long-term strategy of achieving climate neutrality of the world economy [3], tightening quotas and raising taxes on greenhouse carbon dioxide emissions [4,5], increasing energy prices [6], reducing metallurgical value, conditionality and number of mined ore [7,8], the need to increase the degree of compensation for this shortage with re-processed technogenic resources [9,10], etc. The aggravation of the problem of seeking rational ways of ecological and economical safely of the ferroalloy industry [11,12] will undoubtedly entail the steel and alloy industry.…”