Method for preparing nickel-containing solid particle briquette

Abstract

The invention discloses a method for preparing a nickel-containing solid particle briquette. The method comprises steps of (1) providing nickel-containing solid particles with average particle size below 75 micron; (2) wrapping the nickel-containing solid particles with organic coating agent; (3) mixing the wrapped nickel-containing solid particles obtained in step (2) with adhesive, wherein the adhesive contains syrup and at least one of hydrated lime and quick lime; (4) briquetting the mixture obtained in step (3), so as to obtain the nickel-containing solid particle briquette. The method can remarkably lower the cost for preparing the nickel-containing solid particle briquette, the prepared nickel-containing solid particle briquette can be used for smelting without drying, so that the industrial production technology for producing ferro-nickel alloy saves one step, and the production cost is remarkably lowered.

Description

technical field [0001] The invention belongs to the field of chemical industry, in particular, the invention relates to a method for preparing nickel-containing solid particle briquettes. Background technique [0002] Today's new methods of processing lateritic nickel ore mostly use rotary hearth furnaces instead of traditional rotary kilns to complete the reduction of nickel-iron minerals. Because it is a static hearth, it can avoid the high-temperature "ringing" phenomenon like a rotary kiln. The reduction temperature is relatively high, and the obtained direct reduction product is milled and the tailings are discarded to obtain a high-grade nickel-iron powder product with a particle size of less than 200 mesh (75 microns) accounting for about 90%. Usually, the high-grade ferronickel powdery product is melted and smelted in an electric arc furnace, and the electric arc furnace is only suitable for smelting bulk materials. Therefore, it is necessary to agglomerate the ferr...

AI Technical Summary

Problems solved by technology

Since the particle size of the processed nickel-iron powder product is relatively fine, particles below 200 mesh usually account for more than 90%, so the specific surface is relatively large, so water glass is used as a binder, which requires a large amount and relatively high cost.

And the biggest disadvantage of using water-based binders such as water glass is that drying is required after briquetting, which not only increases the drying cost, but also may cause secondary oxidation of the metal during the drying process. At the same time, the drying atmosphere requires control, equipment investment is also large

Images