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Method for producing ferrous metasilicate by purification and impurity removal of nickel smelting waste slag

A technology for purification and removal of impurities and ferrous silicate, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of lack of viability and sustainable development, waste of resources and serious secondary pollution, etc. Achieve good fluidity and chemical activity, reduce pollution and save energy

Inactive Publication Date: 2011-10-05
牛庆君
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The nickel smelting waste slag is piled up after cooling, occupying a large amount of land and causing serious pollution to the environment
[0004] At present, my country has accumulated about 10 million tons of nickel smelting waste slag, and it is still increasing at a rate of about 1.8 million tons per year, resulting in a great waste of resources and serious pollution of the environment.
[0005] Nickel smelting slag contains Ni, Cu, Fe, Co, S, CaO, MgO, SiO 2 etc., using nickel smelting waste slag to recover iron metal alone, there are mature technologies and processes at home and abroad for reference. It is characterized by excessive energy consumption, serious secondary pollution, high overall production cost, poor economic and environmental benefits, and no viability and sustainable development capabilities. Therefore, these methods have no practical value and have not been actually promoted and used so far.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: A method for producing ferrous silicate by using nickel smelting waste slag to purify and remove impurities. The treatment method includes the following steps: heating the nickel slag to a molten state, and keeping the nickel slag in a molten state by heat preservation, wherein the molten nickel The slag refers to the temperature at 1150°C-1300°C, and at the same time, oxygen is introduced into the nickel slag to react to form a solid residue. -10 minutes, until this solid residue no longer generates, remove above-mentioned solid residue, remove the bottom account for the residue of 4%-6% heavy metal layer of slag gross weight, get final product ferrous silicate, the molecular formula of ferrous silicate is FeSiO 3 2FeO SiO 2 .

Embodiment 2

[0026] Embodiment 2: A method for producing ferrous silicate by using nickel smelting waste slag to purify and remove impurities, the processing method includes the following steps: heating the nickel slag to a molten state, keeping the nickel slag in a molten state by heat preservation, wherein the molten nickel The slag refers to the temperature at 1150°C-1300°C, and at the same time, the air is passed into the nickel slag to react to form a solid residue. -10 minutes, until the solid residue is no longer generated, remove the above-mentioned solid residue and remove the residue of the heavy metal layer that accounts for 4%-6% of the total weight of the slag at the bottom to get ferrous silicate. The molecular formula of ferrous silicate is FeSiO 3 2FeO SiO 2 .

Embodiment 3

[0027] Embodiment 3: A method for producing ferrous silicate by purifying and removing impurities from nickel smelting waste slag, the processing method includes the following steps: heating the nickel slag to a molten state, and keeping the nickel slag in a molten state by heat preservation, wherein the molten nickel Slag refers to the temperature at 1150°C-1300°C. When the content of potassium ions and sodium ions in nickel slag is measured, when the weight percentage of potassium ions is greater than 0.05%, and the weight percentage of sodium ions is greater than 0.05%, the nickel slag In order to pass into the chlorine gas that reacts to generate solid residue, the amount of chlorine gas that is passed into is 0.1-0.25 cubic meters per ton of nickel slag, and the feeding time of chlorine gas is 5-10 minutes until the solid residue is no longer generated So far, remove the above-mentioned solid residue, and remove the residue of the heavy metal layer at the bottom of 4%-6% o...

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Abstract

The invention relates to a technique for comprehensively utilizing waste slag generated in nonferrous metallurgy, a technique for comprehensively utilizing the purification and impurity removal of nickel smelting waste slag, in particular to a method for producing ferrous metasilicate by the purification and impurity removal of the nickel smelting waste slag, which can produce ferrous metasilicate products by purifying and impurity-removing the nickel smelting waste slag in the state of high-temperature thermal fluid. The method comprises the steps of: a, heating nickel slag until the nickel slag is melted or directly taking melted nickel slag; b, performing thermal insulation to make the nickel slag remain in a molten state, and simultaneously aerating oxygen or air into the nickel slag for a reaction to generate solid slag; and c, removing the solid slag, and removing bottom slag, of which the weight is 4 to 6 percent of the total weight of the slag, on a heavy metallic layer to obtain a finished product. The method has the advantages of energy conservation, environmental protection and low cost, and can produce the ferrous metasilicate products by purifying and impurity-removing the nickel smelting waste slag in the state of thermal fluid, namely at the temperature of between 1,150 and 1,300 DEG C.

Description

technical field [0001] The present invention relates to a comprehensive utilization technology of non-ferrous metal smelting waste slag, especially the comprehensive utilization technology of nickel smelting waste slag, and especially relates to a method of purifying nickel smelting waste slag in a hot liquid state of 1150°C-1300°C The invention discloses a method for producing ferrous silicate by using nickel smelting waste slag for removing impurities to produce ferrous silicate products. Background technique [0002] Nickel metal is a non-ferrous metal, which is widely used in the national economy, especially in the iron and steel industry, electromechanical, inorganic chemical industry, and new material industry. The pyro-nickel smelting industry is an important branch of the non-ferrous metallurgy industry and an important non-ferrous metal raw material industry. During nickel smelting, SiO in charge 2 , CaO, MgO, Al 2 o 3 , Fe 3 o 4 The mixture enters the electri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20B09B3/00
Inventor 牛庆君王振峰
Owner 牛庆君
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