Comprehensive utilization method of nickel and iron slags

A technology for nickel-iron slag and filter slag, which is applied to the treatment field of ferroalloy slag, can solve the problems of swelling of building materials, high content of silicon and magnesium, and low content of calcium, and achieves the effect of reducing the stock.

Inactive Publication Date: 2016-04-13
UNIV OF SCI & TECH LIAONING
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AI Technical Summary

Problems solved by technology

According to the requirements of the national standard of Portland cement, the amount of ferronickel slag added is less than 8%, which limits the amount of ferronickel slag used
Compared with metallurgical waste slags such as steel slag, blast furnace slag and ferromanganese slag, the content of silicon and magnesium in ferronickel slag is high, and the content of calcium is low. The magnesium content in it is about 30% (MgO), and the activity index is lower than 50%. Restricting the gelling property of ferronickel slag may cause swelling problems in building materials produced from ferronickel slag

Method used

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  • Comprehensive utilization method of nickel and iron slags

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Effect test

Embodiment 1

[0015] Such as figure 1 As shown, a comprehensive utilization method of nickel-iron slag, the method steps are as follows:

[0016] 1. Inspect the chemical composition of nickel-iron slag, the result is: NiO0.16%, SiO 2 53.48%, Fe 2 O 3 5.91%, CaO1.56%, MgO28.34%, Al 2 O 3 4.62%, other 5.93%;

[0017] 2. After the ferronickel slag is crushed and finely ground to below 100 mesh, it is mixed with ammonium sulfate according to the mass ratio of ammonium ore 4:1, and roasted at 400°C for 2 hours. The ammonia generated during the roasting process is absorbed by water and used for roasting After 3 times the volume of water is fully dissolved, liquid-solid separation is performed to obtain magnesium sulfate filtrate and filter residue;

[0018] 3. Continuously add ammonia water to the magnesium sulfate filtrate, keep the solution temperature at 60°C, control the pH value to 9, fully stir until no precipitation occurs, filter the solution after the precipitation, to obtain the magnesium hyd...

Embodiment 2

[0022] Such as figure 1 As shown, a comprehensive utilization method of nickel-iron slag, the method steps are as follows:

[0023] 1. Check the chemical composition of nickel-iron slag, the result is: NiO0.22%, SiO 2 51.78%, Fe 2 O 3 7.06%, CaO3.39%, MgO29.17%, Al 2 O 3 2.86%, other 5.52%;

[0024] 2. After the ferronickel slag is crushed and finely ground to below 150 mesh, it is mixed with ammonium bisulfate at a mass ratio of 5:1 and roasted at 450°C for 1.5 hours. The ammonia produced during the roasting process is pressurized and liquefied to obtain a liquid Ammonia and roasting residue are fully dissolved in 4 times the volume of water and then liquid-solid separation is performed to obtain magnesium sulfate filtrate and filter residue;

[0025] 3. Continuously add liquid ammonia to the magnesium sulfate filtrate, keep the temperature of the solution at 50°C, control the pH value to 10, and stir well until no more precipitation occurs. The solution after precipitation is fil...

Embodiment 3

[0029] Such as figure 1 As shown, a comprehensive utilization method of nickel-iron slag, the method steps are as follows:

[0030] 1. Inspect the chemical composition of nickel-iron slag, the result is: NiO 0.37%, SiO 2 49.65%, Fe 2 O 3 8.33%, CaO4.75%, MgO30.62%, Al 2 O 3 3.18%, other 3.1%;

[0031] 2. After the ferronickel slag is crushed and finely ground to below 120 mesh, it is mixed with the mixture of ammonium sulfate and ammonium bisulfate according to the ammonium ore mass ratio 4:1, and roasted at 460℃ for 2 hours. The ammonia gas produced during the roasting process is water The ammonia water is obtained by absorption, the roasting residue is fully dissolved in 5 times the volume of water, and then liquid-solid separation is performed to obtain magnesium sulfate filtrate and filter residue;

[0032] 3. Continuously add liquid ammonia to the magnesium sulfate filtrate, keep the temperature of the solution at 55°C, control the pH value to 10, and stir well until no more pr...

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Abstract

The invention discloses a comprehensive utilization method of nickel and iron slags and aims at utilizing waste resources and protecting environment. The method comprises the following steps: crushing and roasting nickel and iron slags, and obtaining an ammonia water solution; fully dissolving roasting products by water and then filtering so as to obtain a magnesium sulfate solution and filter residues; blowing carbon dioxide gas into a sodium silicate solution and carrying out carbonation so as to obtain a sodium carbonate solution and a filter cake; washing and drying the filter cake so as to obtain a white carbon black product; adding calcium oxide into the sodium carbonate solution, and causticizing so as to obtain a caustic soda solution and calcium carbonate residues; and returning the caustic soda solution back to a filter residue leaching procedure, and calcinating the calcium carbonate residues so as to obtain calcium oxide and carbon dioxide. Through an ammonium sulfate / ammonium bisulfate roasting-leaching technology, magnesium resources in the nickel and iron slags are recycled; iron and nickel in the enriched nickel and iron slags are leached through the alkalinity of the filter residues; and at the same time, silicon resources in the nickel and iron slags are recycled. Ammonium sulfate / ammonium bisulfate and caustic soda are cyclically used, and no pollutants are emitted in the whole technical process.

Description

Technical field [0001] The invention relates to a method for processing iron alloy slag, in particular to a method for comprehensive utilization of nickel-iron slag. Background technique [0002] Nickel-iron slag is a solid waste produced when nickel-iron alloy plants use laterite nickel ore electrothermal reduction to produce nickel-iron. At present, the nickel produced by the world's nickel industry mainly comes from nickel sulfide ore resources, accounting for about 60% of the total output, and the rest comes from laterite nickel ore. However, with the reduction of high-quality (high-grade nickel-containing) and easy-to-mine nickel sulfide resources, the increase in environmental protection requirements, the improvement of laterite nickel ore extraction technology, and the impact of nickel price factors, the amount of nickel produced by laterite nickel ore will be affected. keep growing. With the continuous growth of nickel market demand, the scale of ferro-nickel alloy prod...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B23/00C22B26/22C01B33/12
CPCC01B33/12C22B7/008C22B23/0446C22B26/22Y02P10/20
Inventor 赵昌明宁哲王一雍王国承汪琦艾新港李继东黄亮
Owner UNIV OF SCI & TECH LIAONING
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