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Fayalite type slag desiliconization method

A fayalite and slag technology, applied in the field of mineral engineering, can solve the problems of low iron recovery rate, difficult separation of metal ions, and secondary slag generation, and achieve high silicon oxide removal rate, simple process flow, and good economic benefits Effect

Active Publication Date: 2019-12-31
WUHAN UNIV OF TECH
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Problems solved by technology

However, this method has problems such as difficult separation of metal ions in the solution, large amount of wastewater discharge, and the need for acid-resistant equipment, which limits the industrial application of this method.
The fire method is to use carbon as a reducing agent to reduce ferrous silicate to metallic iron and free silicon oxide at high temperature. At this time, magnetite is also reduced to metallic iron, and then the iron is recovered through magnetic separation. However, the main problems of this method are the low iron recovery rate, the generation of secondary slag, and the difficulty in taking into account the recovery of silicon resources and other valuable metals.

Method used

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  • Fayalite type slag desiliconization method
  • Fayalite type slag desiliconization method

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specific Embodiment approach

[0040] The main chemical components of the copper slag and nickel slag used in this embodiment are shown in Table 1.

[0041] Table 1 Chemical composition of copper slag and nickel slag (wt.%).

[0042]

specific Embodiment approach 1

[0044] Step S1, grinding the slag, the slag is copper slag, and grinding the copper slag until the particle size d0.5 is about 33.12 μm;

[0045] Step S2, oxidizing and roasting the ground copper slag, adding it to the roasting furnace, introducing an oxidizing atmosphere, and oxidizing and roasting at a temperature of 1000 ° C for 60 minutes, so as to completely decompose ferrous silicate into iron oxide and silicon oxide, and obtain activation clinker;

[0046] Step S3: Grinding the activated clinker until the particle size d0.5 is about 31.32 μm, and then adding it into the lye for alkaline leaching. In this example, sodium hydroxide alkali solution is used to desilicate the oxidized roasted clinker by alkali leaching, the leaching temperature is 100°C, the liquid-solid ratio is 8, the sodium hydroxide concentration is 160g / L, and the leaching time is 120min;

[0047] Step S4, the solid-liquid separation of the ore pulp obtained by alkali leaching is carried out to obtain si...

specific Embodiment approach 2

[0049] Step S1, grinding the slag, the slag is copper slag, and grinding the copper slag until the particle size d0.5 is about 33.12 μm;

[0050] Step S2, reducing and roasting the ground copper slag, now adding carbon powder to the copper slag, the molar ratio of Fe and C in the nickel slag is 1:2, after mixing and grinding, add to the roasting furnace and pass Reducing atmosphere, and reducing roasting at 1200°C for 60 minutes to completely decompose ferrous silicate into metallic iron and silicon oxide, and obtain activated clinker;

[0051] Step S3: Grinding the activated clinker until the particle size d0.5 is about 30.68 μm, and then adding it into the lye for alkaline leaching. In this example, sodium hydroxide alkaline solution is used to desilicate the oxidized roasted clinker by alkaline leaching, the leaching temperature is 90°C, the liquid-solid ratio is 5, the sodium hydroxide concentration is 160g / L, and the leaching time is 120min;

[0052] Step S4, the solid-l...

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Abstract

The invention provides a fayalite type slag desiliconization method and relates to the technical field of mineral engineering. The fayalite type slag desiliconization method comprises the following steps of S1, performing powder grinding on slag, wherein the slag includes at least one of copper slag and nickel slag; step S2, roasting the ground slag to obtain an activated clinker; S3, grinding theactivated clinker into powder, and adding the powder into alkali liquor to be subjected to alkali leaching; and S4, performing solid-liquid separation on ore pulp obtained by alkali leaching to obtain a silicon-contained alkali liquor and iron concentrates. In the fayalite type slag desiliconization method provided by the invention, by controlling appropriate roasting temperature and roasting time, silicon and iron in the slag are thoroughly separated, so that subsequent desiliconization with alkali leaching is facilitated; the silicon oxide removal rate is high, and resource utilization of silicon resources and other valuable metals in the slag is realized at the same time, so that the fayalite type slag desiliconization method is simple in process flow and low in cost, can realize desiliconization of fayalite type slag, such as the copper slag and the nickel slag, which is difficult to treat and has a wide application prospect and good economic benefit.

Description

technical field [0001] The invention relates to the technical field of mineral engineering, in particular to a method for desiliconizing fayalite-type slag. Background technique [0002] Fayalite-type slag refers to the slag produced in the process of pyrometallurgy with fayalite as the main phase, mainly including copper slag and nickel slag. The main chemical composition of this type of slag is iron and silicon, the content of which is 35 to 50% and 30 to 40% respectively, and has high resource value and economic value. However, the existence forms of iron minerals are relatively complex, mainly in the form of fayalite, followed by magnetite with smaller particle size, and fayalite and magnetite are closely combined, through the conventional grinding-magnetic separation process It is difficult to separate the two, resulting in low iron recovery and low iron grade in the concentrate. Currently, such slags are mainly sold to cement plants as iron correctors, with limited e...

Claims

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Application Information

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IPC IPC(8): C22B1/02C22B1/00
CPCC22B1/005C22B1/02
Inventor 王洪阳宋少先
Owner WUHAN UNIV OF TECH
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