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New process for comprehensively recovering serpentine type minerals

A technology for serpentine and minerals, which is applied in the field of smelting serpentine minerals to achieve the effects of wide application, environmental friendliness and simple process.

Inactive Publication Date: 2012-09-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention compares with above-mentioned technology, and its processing object is with (Mg, Fe, Ni) 3 Si 2 o 5 (OH) 4 Serpentine-based minerals (including lateritic nickel ore), under vacuum conditions, adopt two-step thermal reduction to comprehensively recover magnesium, iron, nickel, and silicon, and obtain metallic magnesium, nickel-iron, and relatively pure secondary Silica, friendly to the environment, has not yet seen relevant reports at home and abroad

Method used

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  • New process for comprehensively recovering serpentine type minerals

Examples

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Effect test

Embodiment 1

[0041] Example 1 Containing MgO 38.99%, SiO 242.25%, FeO 3.43%, NiO 0.23% serpentine ore 500g, add reducing agent coal or coke of 3 times the molar chemical equivalent, press into a block under 20MPa pressure, put it into a vacuum furnace, open the vacuum system, when the pressure is lower than Start to heat up at 50Pa, heat up to 800°C for 1 hour; then heat up to 1500°C for 1 hour, turn off the heating system; when the temperature in the furnace drops to 200°C, turn off the vacuum system and cooling water system; wait until the temperature in the furnace reaches At room temperature, open the vacuum furnace, remove the condensed metal from the condenser, and analyze it through X-ray diffraction to determine that it is metallic magnesium with a purity of >95%. Take out the slag from the crucible, mix it with ore powder with a molar equivalent of 0.5, press it into a block under a pressure of 20MPa, put it into a vacuum furnace, turn on the vacuum system, start to heat up when t...

Embodiment 2

[0042] Example 2 Containing MgO 34.72%, SiO 2 39.21%, FeO 5.87%, NiO 2.18% laterite nickel ore 500g, add reducing agent coal or coke with 2 times the molar chemical equivalent, press into a block under 20MPa pressure, put it into a vacuum furnace, open the vacuum system, when the pressure is lower than 50Pa Start to heat up at 800°C for 1 hour; then raise the temperature to 1500°C for 1 hour, turn off the heating system; when the temperature in the furnace drops to 200°C, turn off the vacuum system and cooling water system; wait until the temperature in the furnace reaches normal temperature , open the vacuum furnace, take off the condensed metal from the condenser, and analyze it by X-ray diffraction to determine that it is metallic magnesium with a purity of >95%. Take out the slag from the crucible, mix it with ore powder with a molar equivalent of 0.8, press it into blocks under a pressure of 20 MPa, put it into a vacuum furnace, turn on the vacuum system, start to heat u...

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Abstract

The invention discloses a method for comprehensively recovering valuable metals from serpentine type minerals (including lateritic-nickel-ore). The method is characterized in that the method comprises two steps of vacuum thermal reduction: the first step is to reduce the magnesium oxide in the lateritic-nickel-ore into metal magnesium by using the carbon as the reducing agent, and the second stepis to reduce the magnesium oxide in the lateritic-nickel-ore into metal magnesium by using the metallic silicon in the residue of the reduction reaction in the first step as the reducing agent and adding defined amount of serpentine type mineral and additive, reduce the ferric oxide and the nickel oxide in the lateritic-nickel-ore into metallic iron, metallic nickel and ferro-nickel, and then separate the metals such as nickel and iron from silicon dioxide through magnetic separation. The invention has the advantages of simple process, convenient operation, wide application range, capability of comprehensively recovering the major metal in the serpentine type minerals and being environment-friendly by having the whole reaction in vacuum.

Description

technical field [0001] The invention belongs to the technical field of smelting serpentine minerals (including laterite nickel ore), and adopts a vacuum smelting method to comprehensively recover magnesium, iron, nickel, silicon, etc. in the minerals, so as to achieve the purpose of comprehensive utilization of the minerals. Background technique [0002] Serpentine is a general term for hydrous magnesium-rich silicate minerals, such as antigorite, lizardite, and chrysotile. Their color is generally green, but also light gray, white or yellow. Because they are often green and green like snake skin, hence the name. Its chemical formula is Mg 3 (Fe,Ni)Si 2 o 5 (OH) 4 , where Fe is +3 valence and Ni is +2 valence, which can replace part of magnesium. Laterite nickel ore is also a serpentine mineral. At present, there are two main smelting methods for this kind of minerals: 1. Wet process, which uses acid or alkali to leach serpentine minerals to obtain magnesium oxide, met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/24C22B5/10C22B5/04C22B5/16C22B26/22C22B23/02
CPCY02P10/20
Inventor 曲涛杨斌田阳戴永年刘洪湘刘大春徐宝强杨部正马文会郁青春李一夫熊恒邓勇蒋文龙陈秀敏姚耀春罗启
Owner KUNMING UNIV OF SCI & TECH