Resourceful utilization method of red mud

Abstract

The invention provides a resourceful utilization method of red mud. The resourceful utilization method of the red mud includes the following steps of (1) reductive transformation of slurry, specifically, the slurry is prepared from the red mud, a reductive transformation agent, lime and water, a reductive thermochemical strict reduction reaction is conducted at the temperature of 60-350 DEG C and at the pressure of 0.1013MPa-4.5Mpa, alkali combined in minerals such as aluminosilicate in the red mud is replaced to form the strong-basicity slurry, and a iron oxide mineral in the red mud is reductively transformed into ferroferric oxide in the strong-basicity slurry, and / or iron contained in the red mud is reduced synchronously with chrominum, titanium, vanadium, gallium, scandium and the like and molten into ferrite crystal lattices to form an isomorphous ferrite magnetic body of the elements like chrominum, titanium, vanadium, gallium and scandium; (2) extracting of iron through magnetic separation; (3) extracting of alkali through separation; and (4) utilization of the aluminosilicate mineral. The resourceful utilization method of the red mud has the advantages of being low in energy consumption, economical, free of secondary pollution, capable of recycling three main components in the red mud effectively and the like.

Description

technical field [0001] The invention relates to the technical field of environmental protection and waste utilization, in particular to a resource utilization method of red mud. Background technique [0002] At present, my country is already the world's largest producer of alumina. In 2015, my country's alumina production capacity accounted for 51.98% of the world's total production capacity, reaching 71.6027 million tons. In 2017, 6 million tons of new production capacity will be put into operation, the total production capacity is expected to reach 80 million tons, and the output in 2017 is expected to reach 65.6 million tons. At present, almost all industrial alumina production methods are alkali methods, mainly including Bayer method, sintering method and Bayer-sintering combined method, which use alkali (NaOH or NaCO 3 ) to process bauxite, so that the alumina in bauxite is dissolved into sodium aluminate solution, and iron, silicon, calcium, magnesium, titanium, scandi...

AI Technical Summary

Problems solved by technology

However, due to problems such as high alkali content, kiln conditions, and low product quality, it was not popularized and applied. Later, due to the restriction of the alkali content of cement by the new national standard, the amount of red mud mixed with sintering method in cement production was very small.

[0010] In 2008, Aluminum Corporation of China once again undertook the "Eleventh Five-Year" National Science and Technology Support Project "Research on Red Mud Harmless Treatment and Resource Utilization Technology" and "Red Mud Dealkalization Test and Utilization of Dealkalized Red Mud to Produce Ordinary Silicic Acid Salt Cement Research” project, the sintering red mud adopts two-stage lime dealkalization for cement production, but due to technical and economical reasons, the harmless utilization technology of red mud and the two-stage lime dealkalization technology are far from effective There are still uncertainties in industrial applications

Although a lot of research work has been done in this area at home and abroad, a lot of results have been achieved, and many red mud products have been developed, but the experience and lessons of comprehensive utilization of red mud over the years show that red mud contains a large amount of combined alkali And complex metal oxides including heavy metals, even if alkali-containing red mud is used as raw material, whether it is used as an inorganic filler, or in the production of cement, bricks and road construction materials, alkali is a harmful component, which directly affects the product. The quality and scope of use seriously restrict the improvement of the comprehensive utilization rate of red mud