Method for preparing pseudo-boehmite co-preparation white carbon black by coal gangue

A technology of pseudo-boehmite and coal gangue, which is applied in the field of co-production of pseudo-boehmite and co-production of white carbon black by using coal gangue, which can solve the problems of high raw material cost, low resource utilization rate, environmental damage, etc., and achieve uniform particle size , high added value, and low equipment requirements

Active Publication Date: 2015-04-01
DATANG INT HIGH ALUMINA COAL R & D CENT
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AI Technical Summary

Problems solved by technology

[0004] In short, the existing methods for preparing pseudo-boehmite mainly use aluminum hydroxide and industrial sodium metaaluminate as raw materials. The cost of raw materials is relatively high, and when the raw materials contain siliceous components, most of them are treated as Residue discharge, low utilization rate of resources, damage to the environment

Method used

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  • Method for preparing pseudo-boehmite co-preparation white carbon black by coal gangue

Examples

Experimental program
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Effect test

Embodiment 1

[0042] In this example, the main mineral component of coal gangue is kaolinite, and the content of impurity minerals is extremely low; alumina, silica, and loss on ignition account for 40.08%, 37.65%, and 17.32%, respectively.

[0043] 1) Preparation of activated coal gangue powder: Weigh 50 grams of coal gangue, crush it into 50-300 mesh, grind it, remove impurities, roast it, and then naturally cool to obtain activated coal gangue powder;

[0044] 2) Alkali leaching desiliconization: put the above-mentioned activated coal gangue powder in a leaching device, and use a 20% mass fraction of dilute sodium hydroxide solution for 30 minutes at 90°C. The total amount of sodium hydroxide is as follows: Na 2 O: SiO 2 =1.0 mass ratio calculation, after the reaction is completed, filter to obtain sodium silicate solution and alkali leaching residue;

[0045] 3) Preparation of white carbon black:

[0046] a. Add sodium hexametaphosphate to the above sodium silicate solution, the qual...

Embodiment 2

[0054] Alumina, silica, and loss on ignition account for 37.36%, 42.79%, and 15.60% of the coal gangue used in this example, respectively.

[0055] 1) Preparation of activated coal gangue powder: Weigh 50 grams of coal gangue, crush it into 50-300 mesh, grind it, remove impurities, bake it at 800° C., and then cool it naturally to obtain activated coal gangue powder.

[0056] 2) Alkali leaching desiliconization: put the above-mentioned activated coal gangue powder in the leaching device, add 18% sodium hydroxide solution in two times for alkali leaching: add 50-80% of the total amount for the first time %, the alkali leaching time is 30~40 minutes; add the remaining sodium hydroxide solution for the second time, and the alkali leaching time is 20~30 minutes; the total amount of sodium hydroxide is based on Na 2 O: SiO 2 =1.1 mass ratio calculation, after the reaction is completed, filter to obtain sodium silicate solution and alkali leaching residue.

[0057] 3) Preparation ...

Embodiment 3

[0066] Alumina, silica, and loss on ignition account for 40.08%, 37.65%, and 17.32% of the coal gangue used in this example, respectively.

[0067] 1) Preparation of activated coal gangue powder: Weigh 50 grams of coal gangue, crush it into 50-300 meshes, grind it, remove impurities, bake it at 1000° C. and cool it naturally to obtain activated coal gangue powder;

[0068] 2) Alkali leaching desiliconization: put the above-mentioned activated coal gangue powder in the leaching device, add 15% sodium hydroxide solution in two times for alkali leaching: add 50-80% of the total amount for the first time %, the alkali leaching time is 30~40 minutes; add the remaining sodium hydroxide solution for the second time, and the alkali leaching time is 20~30 minutes; the total amount of sodium hydroxide is based on Na 2 O: SiO 2 =1.1 mass ratio calculation, after the reaction is completed, filter to obtain sodium silicate solution and alkali leaching residue.

[0069] 3) Preparation of ...

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Abstract

The invention provides a method for preparing pseudo-boehmite co-preparation white carbon black by coal gangue. The method comprises the steps: the coal gangue is ground, roasted, alkaline-leached and filtered so that sodium silicate solution and alkaline leaching dregs are obtained, a dispersing agent is added to the sodium silicate solution and after gas containing CO2 is fed into the solution, a white carbon black product is prepared; lime and sodium carbonate are added into the alkaline leaching dregs for sintering, clinker obtained by the sintering is water-quenched to obtain NaAlO2 solution, the gas containing CO2 is added to the NaAlO2 solution for carbonation to form glue, ageing treatment is performed to seriflux after glue forming and powder-shaped pseudo-boehmite is obtained after the aged seriflux is washed, filtered, dried and smashed. The coal gangue serves as a raw material for preparation of the pseudo-boehmite and the white carbon black so that high-valued comprehensive utilization of industry solid wastes is achieved and an additional value of a product is high; all by-products can be recovered and recycled so that zero release, low energy consumption, economy and environment protection are achieved; and a requirement for a device is low, the while coal black prepared and the pseudo-boehmite prepared are high in purity, fine and even in granularity and high in specific surface area.

Description

technical field [0001] The invention relates to a method for preparing pseudo-boehmite co-production white carbon black from coal gangue, in particular to a method for preparing pseudo-boehmite co-production white carbon black by using coal gangue alkali method. Background technique [0002] Coal gangue is the main associated mineral that occurs in coal-measure strata. They are generally located on the roof or floor of the coal seam, or exist in the coal seam in the form of gangue. They are often discarded as solid waste during the coal mining process, which not only causes resource loss Waste, and pile up on the surface, occupying fertile land, causing serious environmental pollution. Based on the requirements of comprehensive utilization of resources, environmental protection and development of circular economy, it is of great economic and social significance to develop high value-added chemical products such as pseudo-boehmite and white carbon black using coal gangue as r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C01F7/02C01B33/12
CPCY02P20/141Y02W30/20
Inventor 孙俊民苏杰伍泽广张战军高志军张生
Owner DATANG INT HIGH ALUMINA COAL R & D CENT
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