48 results about "Fayalite" patented technology

The invention relates to a method for extracting valuable elements from slag of melted high-iron high-silicon nonferrous metal with fire to produce low-carbon low-sulfur molten iron and directly produce heat-resisting structural steel. The method for extracting valuable elements from slag of melted high-iron high-silicon nonferrous metal comprises the physical modification, the oxidation modification, the reduction and the magnetic separation of the slag of nonferrous metal, the proportion of the slag (the melting of the components) and the adjustment of the components. Adopting the carbonaceous reducing agent and combining the magnetic separation with the FeO oxidation during the proportion of the slag (the melting of the components) and the adjustment of the components, the invention solves the problem of decarbonization after the reduction in the traditional method; adopting the physical modification and the chemical modification, the invention solves the problems that the solid fayalite is difficult to reduce and the finished product contains more sulfur; adopting the proportion of the slag (the melting of the components) after the prereduction of the slag of nonferrous metal,the invention solves the problem of the generation of the foaming slag and the erosion of the furnace lining in the traditional smelting reduction step. According to the characteristics of the valuable elements such as the Fe, the Ni, the Cu and the like in the slag, the valuable elements can be directly used for producing heat-resisting structural steel. The secondary resources are used effectively, and the problem on the environmental protection during smelting the nonferrous metal is solved.

The invention relates to a method for extracting iron from copper smelting waste residue. The method comprises the following steps: pulverizing copper slag, a reductant which is a mixture comprising one or more of anthracite, graphite, petroleum coke and coke, calcium oxide or calcium carbonate into a certain granularity, fully mixing the materials, carrying out mineralogical reconstruction and carbothermal reduction under high temperature to convert fayalite in the residue into iron oxide and then reduce the iron oxide into iron, and recovering the iron by magnetic separation, wherein, nonmagnetic products can be taken as raw materials for burning cement.

The invention discloses a comprehensive utilization method of a ferriferous fayalite material, relates to a processing method of the ferriferous fayalite material, and in particular relates to a method for separating and utilizing iron and silicon in fayalite. The method is characterized by comprising the following steps of: grinding the ferriferous fayalite material; mixing with alkaline liquor for leaching reaction; performing solid-liquid separation on obtained reaction slurry to obtain desilicated concentrate and silicon containing alkaline liquor; and oxidizing the desilicated concentrate in air to goethite. The method disclosed by the invention enriches, separates and extracts iron and silicon elements to form two products: goethite and silicon containing alkaline liquor through alkaline liquor leaching, wherein iron and silicon in ferriferous fayalite exist in solid and liquid states, so that the comprehensive utilization ratio of resources is high and the economic benefit is better.

The invention relates to a method for reducing and extracting copper smelting waste slag through microwave carbon heating, which comprises the following steps: pulverizing copper slag, reducing agents (one material or a mixture of several materials in anthracitic coal, graphite, refinery coke and coke) and calcium oxide or calcium carbonate; mixing the ingredients; adding binding agents for briquetting; drying the materials; then, carrying out mineral phase reconstruction and carbon heat reduction reaction at the high temperature through using microwaves as heating sources; converting fayalite in the slag into ferric oxide, and reducing the ferric oxide into iron; and then, separating and recovering the iron through pulverization and magnetic selection separation. After further copper recovery, nonmagnetic products can be used as raw materials for firing cement.

The invention provides a fayalite type slag desiliconization method and relates to the technical field of mineral engineering. The fayalite type slag desiliconization method comprises the following steps of S1, performing powder grinding on slag, wherein the slag includes at least one of copper slag and nickel slag; step S2, roasting the ground slag to obtain an activated clinker; S3, grinding theactivated clinker into powder, and adding the powder into alkali liquor to be subjected to alkali leaching; and S4, performing solid-liquid separation on ore pulp obtained by alkali leaching to obtain a silicon-contained alkali liquor and iron concentrates. In the fayalite type slag desiliconization method provided by the invention, by controlling appropriate roasting temperature and roasting time, silicon and iron in the slag are thoroughly separated, so that subsequent desiliconization with alkali leaching is facilitated; the silicon oxide removal rate is high, and resource utilization of silicon resources and other valuable metals in the slag is realized at the same time, so that the fayalite type slag desiliconization method is simple in process flow and low in cost, can realize desiliconization of fayalite type slag, such as the copper slag and the nickel slag, which is difficult to treat and has a wide application prospect and good economic benefit.