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A method for discharging magnesium tailings from serpentine without solid waste

A technology of serpentine and tailings, applied in the direction of improving process efficiency, can solve problems such as unfavorable resource recycling, tailings solid waste, environmental impact, etc.

Active Publication Date: 2021-07-20
BEIJING OUFEI JINTAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no good treatment method for these tailings, which is not conducive to the recycling of resources
[0003] Invention patent 201710512597.1 discloses a method for vacuum thermal reduction of nickel-containing serpentine ore to discharge magnesium metal and its by-products. Although magnesium metal can be obtained from magnesium silicate minerals, a large amount of tailings produced become solid waste, seriously affecting the environment

Method used

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  • A method for discharging magnesium tailings from serpentine without solid waste

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Effect test

Embodiment 1

[0051] Using serpentine magnesium tailings and aluminum-containing material fly ash as raw materials, bituminous coal and petroleum coke as reducing agents, serpentine magnesium tailings 40%, aluminum-containing materials 30%, bituminous coal and petroleum coke 20%, Add 5% binder and 5% water. The fixed carbon content of bituminous coal is 40%, the fixed carbon content of petroleum coke is 90%, and the batching ratio of bituminous coal and petroleum coke is 8:2.

[0052] The production steps are as follows:

[0053] 1. Grind the fly ash of serpentine magnesium extraction tailings, reducing agent bituminous coal and petroleum coke into powders with a particle size of less than 1mm; all materials are evenly mixed in a mixer. The mixed materials are made into pellets in the pellet machine, and the pelletizing pressure is 20MPa; the prepared pellets are dried and dehydrated at 100°C, and the water content is required to be no more than 1%.

[0054] 2. Put the dried pellets into ...

Embodiment 2

[0058] Use serpentine magnesium extraction tailings and aluminum-containing material coal gangue as raw materials, bituminous coal and petroleum coke as reducing agents, serpentine magnesium extraction tailings 50%, aluminum-containing materials 20%, bituminous coal and petroleum coke 20%, add 6% binder and 4% water. The fixed carbon content of bituminous coal is 40%, the fixed carbon content of petroleum coke is 90%, and the batching ratio of bituminous coal and petroleum coke is 6:4.

[0059] The production steps are as follows:

[0060] 1. Grind the fly ash of serpentine magnesium extraction tailings, reducing agent bituminous coal and petroleum coke into powders with a particle size of less than 1mm; all materials are evenly mixed in a mixer. The mixed materials are made into pellets in the pellet machine, and the pelletizing pressure is 30MPa; the prepared pellets are dried and dehydrated at 150°C, and the water content is required to be no more than 1%.

[0061] 2. Put...

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Abstract

The invention provides a method for discharging magnesium extraction tailings from serpentine without solid waste, belonging to the field of mineral solid waste utilization. The present invention makes full use of the tailings of serpentine for extracting magnesium, and the whole process has no tailings discharge, and all of them are utilized; the present invention utilizes the tailings of serpentine for extracting magnesium as the raw material for producing aluminum-silicon-calcium alloys, because the serpentine for extracting magnesium The content of calcium oxide in the tailings is high, so the reduction temperature can be reduced (1500-1800°C), and the generated scum is used to extract magnesium from serpentine to prepare magnesium tailings from serpentine, and the aluminum-silicon-calcium alloy is further vacuum distilled to obtain Calcium metal, and the rest is aluminum-silicon alloy, which can be used as a reducing agent for extracting magnesium from serpentine. The whole technological process provided by the present invention obtains metallic magnesium, metallic calcium and aluminum-silicon alloy, and comprehensively utilizes the valuable elements in the tailings of magnesium extraction from serpentine, and the whole technological process belongs to a green recycling technological process.

Description

technical field [0001] The invention relates to the technical field of mineral solid waste utilization, in particular to a method for discharging magnesium tailings from serpentine without solid waste. Background technique [0002] There are a large amount of serpentine in my country, reaching the level of 100 billion tons, which is a good raw material for the production of metal magnesium. Moreover, there is also a large amount of laterite nickel ore in my country. The gangue mineral is serpentine type, which is also a good raw material for magnesium smelting. Therefore, when these serpentinite and laterite nickel ores are used to extract metal magnesium, a large amount of tailings will be generated. At present, there is no good treatment method for these tailings, which is not conducive to the recycling of resources. [0003] Invention patent 201710512597.1 discloses a method for vacuum thermal reduction of nickel-containing serpentine ore to discharge magnesium metal and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242C22B5/10C22B7/00C22B26/20C22B21/02C22B9/02C22B9/04C22B9/10C22B21/06C22B26/22
CPCC22B1/2406C22B1/242C22B5/10C22B7/001C22B9/02C22B9/04C22B9/10C22B21/02C22B21/068C22B26/20C22B26/22Y02P10/20
Inventor 卢惠民
Owner BEIJING OUFEI JINTAI TECH CO LTD