A method for extracting iron oxide, aluminum oxide and scandium oxide by neutralizing cobalt-nickel hydroxide smelting slag and titanium white waste acid

Abstract

The invention relates to a method for extracting ferric oxide, aluminum oxide and scandium oxide through neutralization of cobaltous hydroxide nickel smelting slag and waste titanium dioxide acid. The method comprises the following steps: firstly, performing neutralization on cobaltous hydroxide nickel smelting slag with the waste titanium dioxide acid and water in a certain ratio, adding a flocculant to remove silicon, filtering so as to obtain filtrate, performing reextraction of Al, Fe and Sc in the obtained filtrate by using an extraction agent respectively so as to obtain aluminum salt, ferric salt and Sc(OH)3, performing high-temperature roasting on the ferric salt and the aluminum salt, thereby obtaining oxides with relatively high purity, and roasting the Sc(OH)3, thereby obtaining the scandium oxide. The method has the beneficial effects that valuable metals such as iron and aluminum are extracted by using the cobaltous hydroxide nickel smelting slag, and the rare earth metal scandium is recycled, so that the comprehensive utilization rate of metals in ore can be increased, environment pollution can be reduced, and high economic benefits and environment benefits can be created.

Description

technical field [0001] The invention relates to a method for neutralizing and extracting iron oxide, aluminum oxide and scandium oxide by using cobalt-nickel hydroxide smelting slag and titanium white waste acid, belonging to the field of smelting and leaching of non-ferrous metal ore. Background technique [0002] Titanium dioxide is one of the most important chemical raw materials at home and abroad. At present, there are nearly 100 titanium dioxide factories in my country, with an annual production capacity of 600,000 tons. Except for the production process of Jinzhou titanium dioxide factory, which adopts the chlorination method, the others are all sulfuric acid methods. Production, according to statistics, the production process produces about 8-10 tons of 20% waste acid per ton of titanium dioxide produced, and the waste acid produced every year reaches 4.8-6 million tons. For such a large amount of high-concentration waste acid, domestic titanium dioxide Most white powd...

AI Technical Summary

Problems solved by technology

[0003] Nickel hydroxide smelting tailings contain a large amount of iron and aluminum. At the same time, during the process of removing iron from nickel hydroxide smelting, a large amount of scandium is also deposited in the iron slag. The existing treatment method is to carry out pyrometallurgical smelting of iron slag into stainless steel ingots for processing, resulting in the loss of scandium

Chinese patent 201510187607.X introduces a method for treating the slag, which uses repeated acid dissolution and repeated precipitation to prepare crude scandium hydroxide. This process has the disadvantages of long process flow, high cost, and ineffective recovery of iron and aluminum.