Method for deep reduction and magnetic separation of nickel and iron in lateritic nickel ore carbon-containing pellets

Abstract

The invention discloses a method for deep reduction and magnetic separation of nickel and iron in lateritic nickel ore carbon-containing pellets. The method aims at realizing deep reduction calcination and magnetic separation, and has obvious nickel and iron enrichment effects. The method comprises the following steps of carrying out crushing and abrasive cleaning of lateritic nickel ores by a jaw crusher and a ball mill, removing soil, carrying out dehydration and drying by an oven, adding a reducing agent, CaO as a flux and a composite binder into the dried lateritic nickel ore particles, feeding the mixture into a damp mill to obtain the uniform mixture, feeding the uniform mixture from the damp mill into a disc-shaped pelletizer for pelletizing, respectively carrying out drying, preheating and calcination by a grate and a rotary kiln, throwing the calcined pellets into a sealed channel of a cooling water tank, wherein an annular air cooler is arranged around the sealed channel, feeding heat carried by the calcined pellets back to the grate for use by the annular air cooler, carrying out water quenching of the calcined pellets falling into the cooling water tank so that the calcined pellets are crushed automatically, dragging nickel, iron and slag in the cooling water tank by a slag dragging machine and feeding them into the ball mill for fine grinding, directly feeding theobtained nickel and iron ore powder into a magnetic separator for separation, drying the separated nickel and iron ore powder by an oven, packaging the dried nickel and iron ore powder, warehousing the packaged nickel and iron ore powder, drying the separated nonmagnetics by an oven, and warehousing the dried nonmagnetics as magnesium raw materials.

Description

technical field [0001] The invention relates to a production method of nickel-iron alloy, in particular to a good method with short flow process, simple operation, low energy consumption, conforming to environmental sanitation conditions, and high economic value of nickel-iron alloy (stainless steel raw material). Background technique [0002] With the adjustment of the world's energy structure and the continuous development and improvement of iron and steel production technology, direct reduction ironmaking technology, as one of the emerging and pioneering cutting-edge technologies, can better adapt to the continuous development of modern iron and steel enterprises to become more compact, more efficient, and more efficient. The development trend of continuous, high cleanliness and environmental friendliness will surely become the main development direction of steel production technology. The processing methods of laterite nickel ore put into production in the world are pyro...

AI Technical Summary

Problems solved by technology

The disadvantages of the wet treatment process are: low nickel recovery rate, low economic value, too much acid consumption, not suitable for ores with more clay, serious scaling and corrosion, and low production efficiency

The wet process is used to separate the nickel and iron in the laterite nickel ore, and then fuse them in the process of smelting stainless steel, resulting in a waste of energy and resources

There is a large amount of toxic and harmful waste in production, zero in the open air, causing serious environmental pollution