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Comprehensive extraction method of ferro-silico-aluminum in gangue

A comprehensive extraction and coal gangue technology, applied in the direction of chemical instruments and methods, silicon oxide, sulfur compounds, etc., can solve the problems of high impurity content in products, low total recovery rate of valuable elements, etc., to reduce reaction heat consumption and raw material selection Wide range and good activity

Active Publication Date: 2012-06-27
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alkali calcination method is similar to the sintering alumina production process, which dilutes the content of valuable components in the raw materials, and the main energy is provided by the outside; the acid leaching method includes sulfuric acid method and hydrochloric acid method, the use of heat source is reasonable, and the recovery rate of valuable elements is quite different. , different inventions adopt different treatment processes, and they all focus on realizing the recycling of process by-products inside the system, but there are problems such as low total recovery of valuable elements or high impurity content in products, and it does not involve the simultaneous recovery of silicon-aluminum-iron. Retrieval, there is no similar public report on the method of efficiently recovering silicon-aluminum-iron in coal gangue

Method used

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  • Comprehensive extraction method of ferro-silico-aluminum in gangue
  • Comprehensive extraction method of ferro-silico-aluminum in gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the method for comprehensively extracting ferrosilicon in coal gangue, concrete operations are as follows:

[0033] Take 10kg of coal gangue and grind it with a Φ500×600 ball mill. The particle size is required to be less than 5% after passing through a 60-mesh sieve. The grinding material is placed in a circulating fluidized bed and activated at 850°C for 5 minutes. SiO in gangue ash 2 、Al 2 o 3 , TFe content are 56.20%, 38.57% and 2.35% respectively, take activated coal gangue slag 1000g and put it into a 5L three-neck flask, add 4000g mass percent concentration of 30% sulfuric acid solution under stirring state, the reaction temperature is 90 ℃, the reaction After 4 hours, filter to obtain the acid leaching filtrate.

[0034] Add activated slag to neutralize free acid in the above acid leaching filtrate, the reaction temperature is 90°C, when the pH value of the solution is 2, filter while it is hot, when the filtrate is heated to 90°C, slowly add 8%...

Embodiment 2

[0037] Embodiment 2: the method for comprehensively extracting ferrosilicon in coal gangue, concrete operations are as follows:

[0038] Take 10kg of coal gangue and grind it with a Φ500×600 ball mill. The particle size requirement is that the sieve residue of 60 mesh sieve is less than 5%. SiO in gangue ash 2 、Al 2 o 3 , TFe content are 54.27%, 32.42% and 6.17% respectively, take activated coal gangue slag 1000g and put in the three-necked flask of 5L, add 3500g mass percent concentration and be 50% sulfuric acid solution under stirring state, reaction temperature is 92 ℃, reaction After 4 hours, filter to obtain the acid leaching filtrate.

[0039] Add activated slag to the above acid leaching filtrate to neutralize free acid, the reaction temperature is 93°C, when the pH value of the solution is 1.5, filter while it is hot, when the filtrate is heated to 90°C, slowly add Soda ash solution, when the pH is 3.9, keep it warm at the operating temperature for 1 hour, filter ...

Embodiment 3

[0042] Embodiment 3: the method for comprehensively extracting silicon-aluminum-iron in coal gangue, concrete operations are as follows:

[0043] Take 10kg of coal gangue and grind it with a Φ500×600 ball mill. The particle size is required to be less than 5% after passing through a 60-mesh sieve. The grinding material is placed in a circulating fluidized bed and activated at 750°C for 20 minutes. SiO in gangue ash 2 、Al 2 o 3 , TFe content are 50.50%, 27.51% and 8.43% respectively, take activated coal gangue slag 1000g and put it into a 5L three-necked flask, add 3000g mass percent concentration of 70% sulfuric acid solution under stirring state, the reaction temperature is 95 ℃, the reaction After 4 hours, filter to obtain the acid leaching filtrate.

[0044] Add activated slag to neutralize free acid in the above acid leaching filtrate, the reaction temperature is 95°C, when the pH value of the solution is 1.0, filter while it is hot, when the filtrate is heated to 95°C,...

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Abstract

The invention discloses a comprehensive extraction method of ferro-silico-aluminum in gangue, comprising the following steps of: using gangue as a raw material, crushing, grinding, activating, carrying out acid leaching, filtering, neutralizing free acid in the acid leaching filtered solution by the use of active slag, filtering to obtain a neutralized acid leaching solution, adding a sodium carbonate solution into the neutralized acid leaching solution, adjusting pH value, separating iron and aluminium to obtain hydrous iron oxide, aluminium hydroxide and a by-product sodium sulphate, adding sodium sulphate and coke into the acid leaching slag which has undergone acid leaching and filtration, carrying out a high-temperature melt reaction to recover silicon so as to prepare soluble glass, simultaneously recovering sulfur dioxide to prepare sulfuric acid, reusing sulfuric acid for the acid leaching treatment, diluting the soluble glass by the use of a sodium carbonate solution, carrying out carborization to obtain white carbon black, and reusing the carbonating solution for iron-aluminium separation. The method provided by the invention has characteristics of wide application range of the raw material gangue, high comprehensive recovery rate, no output of by-products, less residue amount and the like, provides a novel technological process for high-efficiency recovery of ferro-silico-aluminum from gangue, and expands the ways of gangue application.

Description

technical field [0001] The invention relates to a method for comprehensively extracting ferrosilicon in coal gangue, and belongs to the technical field of resource utilization of coal series solid waste. Background technique [0002] China is a developing country that uses coal as its main energy source. Coal accounts for more than 70% of primary energy consumption, more than twice the world average. The energy structure is still dominated by coal. [0003] Coal gangue is solid waste discharged during the coal mining process and coal washing process. It is a black-gray rock with low carbon content and harder than coal that is associated with coal seams during the coal formation process. Including the excavation gangue during the roadway excavation, the gangue extracted from the roof, floor and interlayer during the mining process, and the gangue picked out during the coal washing process. Its main component is SiO 2 、Al 2 o 3 , also contains varying amounts of Fe 2 o ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/02C01F7/02C01D5/00C01B17/74C01B33/12B09B3/00
Inventor 夏举佩张召述杨荣晁静霞
Owner KUNMING UNIV OF SCI & TECH
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