Pelletizing method of ilmenite concentrates and pellet binder

Abstract

The invention discloses a pelletizing method of ilmenite concentrates and a pellet binder, wherein the method comprises the following steps: uniformly mixing the ilmenite concentrates, the binder anda carbonaceous reducing agent to obtain a mixed material; pressing the mixed material into green pellets; and drying the green pellets to obtain the dry green pellets.

Description

technical field [0001] The invention relates to the field of titanium metallurgy, in particular to a pelletizing method of titanium concentrate and a pellet binder. Background technique [0002] Micro-grained titanium concentrate is prepared by a new flotation process, and its main component is TiO 2 , FeO, CaO, Al 2 o 3 and SiO 2 . The weight of particles with a particle size less than 0.075mm in a kind of fine-grained titanium concentrate used for smelting titanium slag accounts for 72.9% of the total weight. Table 1 shows the fine-grained titanium concentrate and a coarse-grained titanium concentrate. The particle size distribution of the ore. [0003] Table 1 Comparison table of particle size analysis of two different titanium concentrates [0004] Particle size range ≥0.150 [0.109，0.150) [0.075，0.109) [0.045，0.075) [0.038，0.045) ＜0.038 Coarse ore (%) 63.18 18.17 17.14 1.45 0.06 ...

AI Technical Summary

Problems solved by technology

Because the binder introduces MgO and CaO impurities, which affects the quality of titanium slag products, this binder is not suitable for pretreatment of fine-grained titanium concentrate for titanium slag smelting

Chinese patent CN1854226A discloses a binder for gas ash pelletizing, the binder includes CaO, MgO, SiO 2 and Al 2 o 3 and other components, the use of the binder introduced too much CaO, MgO, SiO 2 and Al 2 o 3 When used in titanium slag smelting, it will increase the consumption of reducing agent and reduce the grade of titanium slag, so it is not suitable for pretreatment of fine-grained titanium concentrate for titanium slag smelting

In this method, the temperature of green pellet roasting is too high, and the production cost of pellets is too high

[0009] In addition, the compressive strength of the pellets produced by the traditional grate machine-rotary kiln pelletizing method does not exceed 500N, and the pulverization rate of the pellets is above 9%. Generally, it is only suitable for the reduction of titanium concentrate and the power of the rotary kiln is 10MW. The following small electric furnace smelting titanium slag

However, during the smelting process of a large-scale titanium slag electric furnace with a power of not less than 20MW, the material transportation height difference is large (about 20m), and the furnace is under negative pressure (about -20Pa) during smelting. If there is too much powder, it will directly enter the dust collector. system, reducing titanium yield

To meet the working conditions of large-scale titanium slag electric furnace smelting, the strength of pellets must not be lower than 1200N, and the pulverization rate of pellets should not exceed 2%. Therefore, the traditional pelletizing method does not meet the index requirements of large-scale electric furnace smelting pellets.