Binder for producing carbon-containing pellets, carbon-containing pellets and preparation method thereof

Abstract

The invention discloses a binder for producing carbon-containing pellets, the carbon-containing pellets and a preparation method thereof. The binder comprises, by weight, 1.5-2.5 parts of bentonite, 0.3-0.5 part of starch, and 0.03-0.05 part of caustic soda. The carbon-containing pellets containing the binder comprise, by weight, 100 parts of laterite nickel ore, 25-28 parts of reduced coal, 12-15parts of limestone, 1.5-2.5 parts of bentonite, 0.3-0.5 part of starch and 0.03-0.05 part of caustic soda. The preparation method for the carbon-containing pellets comprises the steps that the laterite nickel ore, the reduced coal, the limestone and the bentonite are compounded according to the mass ratio to obtain a first ingredient group, and the starch, the caustic soda and water are mixed according to the mass ratio to be dissolved and stirred to obtain a second mixture; and then the first ingredient group and the second mixture are mixed together to obtain a third mixture, the third mixture is fed into a ball press machine to produce wet carbon-containing pellets, and the wet carbon-containing pellets are dried. The binder for producing the carbon-containing pellets has less additionamount and can be evenly mixed with laterite nickel ore, the formability of the produced carbon-containing pellets is good, and the drop strength, the compressive strength and the like are significantly improved.

Description

technical field [0001] The invention relates to a binder and the application of the binder, in particular to a binder used in the process of producing carbon-containing pellets from laterite nickel ore, carbon-containing pellets containing the binder, and the carbon-containing pellets Method of pellet preparation. Background technique [0002] As an alloying element of steel, nickel can increase many properties of steel such as corrosion resistance, oxidation resistance, plasticity, weldability and low temperature toughness, and is widely used in the production of stainless steel. Over the past 30 years, the annual growth rate of global ferronickel demand has exceeded 5%. In recent years, the annual growth rate of ferronickel demand in Asia has even reached about 10%. With the continuous increase of the world's demand for ferronickel, the nickel sulfide ore resources available for development are increasingly exhausted, and people have to turn their attention to the develop...

AI Technical Summary

Problems solved by technology

However, the surface of lateritic nickel ore has poor hydrophilicity, and the reduced coal and limestone mixed in are also hydrophobic materials, so it is difficult to use these three materials to produce carbon-containing pellets by pelletizing process

According to the production of pellets in my country's metallurgical industry, conventional binders are added to produce carbon-containing pellets. The amount of binder added is large, and the return rate is as high as 25-30% during the pelletization process; during the drying process, the reaction speed is slow, Affects production and increases energy consumption

At the same time, adding a large amount of binder will affect the grade of raw material iron, bring in a large amount of impurities, affect the energy consumption and output of reduction, and have a great impact on production costs and economic benefits

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