Method for producing low iron aluminum sulfate by utilization of coal gangue

A low-iron aluminum sulfate and coal gangue technology, which is applied in the removal of aluminum sulfate, aluminum-sulfur compounds, and solid waste, etc., can solve the problem of no public reports of low-iron aluminum sulfate, fine coal gangue grinding particle size, and low product quality grade. and other problems, to achieve the effect of reducing aluminum loss, less aluminum loss and good activity

Inactive Publication Date: 2012-01-11
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these patents, there are problems such as too fine grinding of coal gangue powder, high concentration of acid used, high temperature and high pressure, low aluminum yield and low product quality grade.
[0008] After literature search, there is no public report on the direct production of low-iron aluminum sulfate by atmospheric acid method

Method used

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  • Method for producing low iron aluminum sulfate by utilization of coal gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Al 2 o 3 30kg of coal gangue slag with >25% and total iron 2 o 3 , TFe content were 31.57% and 6.16%.

[0040] The following process steps are adopted to produce low-iron aluminum sulfate from coal gangue:

[0041] 1. First pickling

[0042] Get 2000g of activated gangue slag in a 1000ml three-necked flask, add 4050g of water, put it into a water bath, and finally add 1950g of sulfuric acid with a concentration of 98%, which is 1.05 times the amount of acid used in theory, and the total liquid-solid ratio of the reactant is 3:1. Control the temperature in the three-neck flask to 95°C, and the reaction time is 3 hours. Filter while hot, replace with 1000ml of water, incorporate into the filtrate, wash with 9000ml of water three times, and keep the lotion for next use. Obtain filtrate and add up to 6520ml, weight 7978g, Al in the analysis filtrate 2 o 3 : Fe=5.7.

[0043] 2. The first iron removal

[0044] Add 570g of fresh coal gangue slag to the ab...

Embodiment 2

[0050] Example 2: Al 2 o 3 30kg of coal gangue slag with >25% and total iron 2 o 3 , TFe content were 26.52.% and 9.17%.

[0051] The following process steps are adopted to produce low-iron aluminum sulfate from coal gangue:

[0052] 1. First pickling

[0053] Get 2000g of activated coal gangue slag in a three-necked flask of 10000ml, add 6284g of water, put it into a water bath, and finally add 1716g of sulfuric acid with a concentration of 98%, which is 1.09 times the amount of acid used in theory, and the total liquid-solid ratio of the reactant is 4:1. Control the temperature in the three-necked flask to 90°C, and the reaction time is 4 hours. Filter while hot, replace with 500ml of water, incorporate into the filtrate, wash with 9000ml of water three times, and keep the lotion for next use. Obtain filtrate and add up to 6715ml, weight 7978g, through analyzing Al in filtrate 2 o 3 : Fe=7.5.

[0054] 2. The first iron removal

[0055] Add 1200g of fresh coal gang...

Embodiment 3

[0061] Example 3: Al 2 o 3 > 25% and total iron 2 o 3 , TFe content were 32.42% and 4.76%.

[0062] The following process steps are adopted to produce low-iron aluminum sulfate from coal gangue:

[0063] 1. First pickling

[0064] Get activated coal gangue slag 2000g in the there-necked flask of 10000ml, add water 3940g, put in the water bath, add 2060g concentration at last and be 98% sulfuric acid, be 1.08 times of theoretically used acid amount, then the total liquid-solid ratio of reactant is 3:1. Control the temperature in the three-neck flask to 93°C, and the reaction time is 3 hours. Filter while it is hot, replace it with 1000ml hot water, merge it into the filtrate, wash it with 9000ml water three times, and keep the lotion for next use. Obtain filtrate and add up to 6550ml, weight 8013g, Al in the analysis filtrate 2 o 3 : Fe=4.2.

[0065] 2. The first iron removal

[0066] Add 700g of fresh coal gangue slag to the above-mentioned first acid leaching filtr...

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Abstract

The invention relates to a method for producing low iron aluminum sulfate by the utilization of coal gangue and belongs to the technical field of coal solid waste resource utilization. The method provided by the invention comprises the following steps of: carrying out calcination activation on coal gangue at the temperature of 785-850 DEG C, adjusting the pH of an aluminum sulfate solution by directly using the activated coal gangue, oxidizing divalent iron ions into trivalent ions, removing iron precipitate and a few gel in the aluminum sulfate solution by the utilization of the adsorption property of the coal gangue, producing low iron aluminum sulfate, recycling the removed iron slag, and terminating the recycling operation when the removed iron slag amount is greater than 120% of the acid-leach residue amount or the mass ratio of aluminium to iron in an iron-removing liquid is less than 160. The temperature of the calcinated coal gangue satisfies the operation condition for the boiling of a circulating fluidized bed. No addition of an auxiliary agent helps heat recovery. The activity of the coal gangue cinder is good, the grinding requirement is not high and the energy consumption is low. Hydrogen peroxide or ozone, air and variable valence element-containing hypervalent compounds KMnO4, MnO2 oxidizing agents are adopted to remove iron with less loss of aluminium. The ratio of Al2O3 to Fe in the product is greater than 160 and the quality of the product is high. The acid leaching reaction is carried out at normal pressure. And the production is easy to operate at low cost.

Description

technical field [0001] The invention relates to a method for producing low-iron aluminum sulfate by using 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 Al 2 o 3 , SiO 2 , also contains varying amounts of Fe 2 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74B09B3/00
CPCY02W30/20
Inventor 夏举佩张召述谷立轩任雪娇
Owner KUNMING UNIV OF SCI & TECH
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