Method for extracting metal from high calcium metal slag

Abstract

The invention relates to a method of extracting metal from high-calcium metallic slag, belongs to the field of metallurgy, and aims at providing a method of efficiently extracting metal from high-calcium metallic slag. The method of extracting the metal from the high-calcium metal slag comprises the following steps: a, material preparation: uniformly mixing high-calcium metallic slag and an additive to obtain a mixed material, wherein the metal in the high-calcium metallic slag is at least one of vanadium and chromium, the additive is sodium aluminate, or a mixture of at least one sodium carbonate, sodium bicarbonate and sodium hydroxide and at least one of aluminum hydroxide and aluminum oxide, the weight proportion of the high-calcium metallic slag calculated by the content of a metal element to the additive calculated by Na2O is 0.8-2.5; b, calcination: aerobically calcining the mixed material for 2-7 hours at the temperature of 700-1,000 DEG C; and c, leaching: leaching the calcined material to obtain a solution containing the metal element.

Description

technical field [0001] The invention relates to a method for extracting metal from high-calcium metal slag, belonging to the field of metallurgy. Background technique [0002] High calcium metal slag refers to metal slag with high calcium content, such as high calcium vanadium slag, high calcium vanadium chromium slag, high calcium chromium slag, etc. Because the calcium oxide content of these high-calcium metal slags is even as high as about 40 wt%, this increases the difficulty of recycling metals in the slag. At present, there is no economical and effective method to extract metals from high-calcium metal slags. [0003] At present, the smelting of vanadium-titanium magnetite in various countries mainly uses blast furnace or rotary kiln-electric furnace to smelt vanadium-containing molten iron, and then the vanadium-containing molten iron is oxidized and blown to extract vanadium to obtain V 2 o 5 The required vanadium slag. There are four main methods for extracting v...

AI Technical Summary

Problems solved by technology

[0004] (1) The productivity of steelmaking in the converter workshop is low, and it takes a certain time for the semi-steel turnover to extend the smelting cycle from 40 to 45 minutes to 60 to 70 minutes;

[0005] (2) Coolant should be added when blowing vanadium in the duplex method, so that the temperature of the semi-steel is low (1370-1420°C). When the semi-steel is made, the heat balance of the converter smelting is tense, and a considerable amount of scrap steel cannot be processed;

[0006] (3) Due to the small amount of steelmaking slag, the metal desulfurization rate is extremely low (12% to 15%), while the desulfurization rate of the traditional oxygen top-blown converter steelmaking method is 30% to 50%;

[0007] (4) The secondary oxidation of metallic iron and the inclusion of metallic iron in the slag during vanadium blowing cause iron loss

Single slag smelting is beneficial to steelmaking, but from the perspective of the quality of the obtained vanadium slag, the main problem is that the vanadium slag contains low vanadium, V 2 o 5 The average content is less than 10wt%; the calcium oxide content is as high as about 40wt%; the phosphorus content is high

At present, there is no relevant report on the method of effectively extracting vanadium pentoxide from this high-calcium-phosphorus, low-vanadium steel slag