Method for preparing reduced titanium for welding electrodes from ilmenite placer

Abstract

The invention relates to a method for preparing reduced titanium for welding electrodes from ilmenite placer. The method comprises three steps of material mixing, heating reaction and cooling-separation. Compared with the prior art, ilmenite reducing speed is increased greatly, production difficulty is reduced, and reduced titanium with low FeO content can be obtained; low-sulfur reduced titaniumcan be obtained without addition of a sulfur removal agent; reactivity of ilmenite can be improved, removal speed of coal volatile matter is increased, a loose and porous structure is formed by remaining fixed carbon, and follow-up reduction is better facilitated; reactivity of raw materials is improved, a reduction reaction can be performed at lower temperature, and sintering in a kiln is avoidedeffectively; an activated carbon product with high added value can be obtained simultaneously, and overall earnings are high.

Description

technical field [0001] The invention relates to a method for preparing reduced titanium for welding electrodes from ilmenite placer, which belongs to the field of chemical metallurgy. Background technique [0002] How to reduce costs, improve economic benefits and combine my country's raw material resources is the main improvement direction of electrode formulations in recent years. Judging from the current production situation, the J422 electrode of the reduced titanium system has a great advantage. The reasons are: the natural rutile resources are increasingly scarce, titanium dioxide is easy to make the electrode coating red, increase the splash, artificial rutile consumes a lot of electricity, and the cost high. The price of reduced titanium is relatively low, and its main components are TiO2 and metallic iron, which is conducive to improving the process performance of welding rods and product quality, and has been widely used in recent years. [0003] There are relati...

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Problems solved by technology

At present, tunnel kilns or rotary kilns are mainly used for production, and there are certain deficiencies in the prior art. For example, the patent CN1362308A provides a method for reducing titanium by rotary kilns to produce welding electrodes, but this method needs to add additional lime for desulfurization. When the temperature control fluctuates, it will easily lead to many problems such as kiln knots in the kiln and excessive S content in the product; patent CN101758240A uses low-sulfur and low-phosphorus ilmenite as raw material, and controls the reduction of titanium products by adjusting the air distribution in the kiln and the carbon content of the product. Sulfur content does not need to add additional lime for sulfur removal agent, adjust the air pressure in the kiln to divide the temperature in the kiln into three sections, the preheating temperature at the kiln tail is 400~520°C, the firing zone is 950~1150°C, and the kiln head maintains a slightly positive pressure temperature 780~850℃, the preheating temperature at the kiln tail is low, which will easily lead to the difficulty of subsequent reduction, and the amount of tar in the flue gas discharged from the kiln, etc.

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