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Method for CO2 mineralization with blast furnace slag and co-production of aluminum ammonium sulfate

A technology of blast furnace slag and ammonium alum, applied in chemical instruments and methods, inorganic chemistry, cement production, etc., can solve the problem of high energy consumption in mineralization, achieve the effects of reducing environmental pollution, reducing energy consumption, and mild reaction conditions

Active Publication Date: 2017-06-13
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention targets CO 2 The high energy consumption of mineralization and the problem of solid waste treatment in the iron and steel industry provide a method of using blast furnace slag to mineralize CO 2 Method for co-producing ammonium alum

Method used

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  • Method for CO2 mineralization with blast furnace slag and co-production of aluminum ammonium sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0023] (1) Blast furnace slag finely ground to below 150μm and ammonium sulfate ((NH 4 ) 2 SO 4 ) are evenly mixed, and the mass ratio of blast furnace slag and ammonium sulfate is controlled to be 1:2.

[0024] (2), put the mixture obtained in step (1) into the tube furnace, ° C / min heat up to 360 ° C and keep warm for 90min to obtain massive solids, and the tail gas produced in the roasting process is absorbed with water to obtain ammoniacal liquor.

[0025] (3), leaching the massive solid obtained in step (2) with water, and controlling the leaching temperature to 90 ° C The reaction time is 10 minutes, and the liquid-solid mass ratio is 3:1. After the reaction is completed, and filtered to obtain the filtrate and filter residue, the filtrate is the crude ammonium aluminum sulfate, wherein the NH 4 Al(SO 4 ) 2 The concentration is about 80g / L.

[0026] (4), the filtrate obtained in step (3) is sent to the crystallization tank, and the temperature of the crystalliz...

Embodiment 2

[0031](1) Titanium-containing blast furnace slag and ammonium sulfate ((NH 4 ) 2 SO 4 ) are evenly mixed, and the mass ratio of blast furnace slag and ammonium sulfate is controlled to be 1:1.

[0032] (2), put the mixture obtained in step (1) into the tube furnace, ° C / min heating up to 250 ° C and keep warm for 240min to obtain massive solids, and the tail gas produced by the roasting process is absorbed by water.

[0033] (3), leaching the massive solid obtained in step (2) with water, and controlling the leaching temperature to be 100 ° C The reaction time is 60 minutes, and the liquid-solid mass ratio is 2:1. After the reaction is completed, and filtered, the filtrate obtained is the thick liquid of aluminum ammonium sulfate, wherein the NH 4 Al(SO 4 ) 2 The concentration is about 140g / L.

[0034] (4), send the filtrate obtained in step (3) into the crystallization tank, and control the temperature of the crystallization tank to be 0 ° C, crystallization for 3 ...

Embodiment 3

[0039] (1) Blast furnace slag finely ground to below 150μm and ammonium sulfate ((NH 4 ) 2 SO 4 ) are evenly mixed, and the mass ratio of blast furnace slag and ammonium sulfate is controlled to be 1:2.

[0040] (2), put the mixture obtained in step (1) into the tube furnace, ° C / min heating up to 450 ° C and keep warm for 30min to obtain massive solids, and the tail gas produced by the roasting process is absorbed by water.

[0041] (3), leaching the massive solid obtained in step (2) with water, and controlling the leaching temperature to be 75 ° C The reaction time is 90 minutes, and the liquid-solid mass ratio is 0.5:1. After the reaction is completed, and filtered, the filtrate obtained is the thick liquid of aluminum ammonium sulfate, wherein the NH 4 Al(SO 4 ) 2 The concentration is about 280g / L.

[0042] (4), the filtrate obtained in step (3) is sent to the crystallization tank, and the temperature of the crystallization tank is controlled to be 5 ° C, cryst...

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Abstract

The invention discloses a method for CO2 mineralization with blast furnace slag and co-production of aluminum ammonium sulfate. The method comprises the following steps: 1, ammonium sulfate decomposition of blast furnace slag: mixing blast furnace slag and ammonium sulfate at a certain temperature and roasting to convert valuable metal oxide in the blast furnace slag into corresponding ammonium sulfate complex salt; 2, preparation of aluminum ammonium sulfate crude liquor: leaching the roasted product obtained in the step 1 by the use of water so as to obtain aluminum ammonium sulfate crude liquor and leaching residue; 3, cooling for crystallization: cooling the aluminum ammonium sulfate crude liquor to obtain crystallization mother liquor and aluminum ammonium sulfate crystals, washing and airing to obtain aluminum ammonium sulfate; 4, magnesium-rich solution mineralization: adding ammonia water into the crystallization mother liquor obtained in the step 3 and introducing CO2 to generate magnesium carbonate so as to realize CO2 mineralization and obtain first mineralization mother liquor; 5, leaching residue mineralization: adding ammonia water into the leaching residue obtained in the step 2 and introducing CO2 to generate calcium carbonate so as to realize CO2 mineralization and obtain second mineralization mother liquor; and 6, ammonium sulfate circulation: mixing the mineralization mother liquors, carrying out evaporative concentration and cooling for crystallization so as to obtain ammonium sulfate solids and recycling.

Description

Technical field [0001] This invention belongs to CO 2 In the field of emission reduction and solid waste resource utilization, it mainly involves a method of using blast furnace slag to mineralize CO 2 Method for co-producing ammonium alum. Background technique [0002] Since the Industrial Revolution, the extensive use of fossil fuels has resulted in atmospheric CO 2 The concentration increased sharply, CO 2 The issue of emission reduction has reached a global consensus. Carbon dioxide capture and storage (CCS) is a system that suppresses atmospheric CO 2 One of the important options to mitigate climate change due to rising concentrations mainly includes ocean storage, geological storage and mineralization storage. Marine storage and geological storage have secondary disasters such as leakage, geological disasters, groundwater pollution, and ecosystem damage. Compared with the previous two methods, mineralization storage can store CO 2 Converted into stable carbonate...

Claims

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Application Information

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IPC IPC(8): C01F7/76C04B7/14
CPCC01F7/765C01P2006/80C04B7/14Y02P40/10
Inventor 刘维燥李春梁斌胡金鹏汪霖
Owner SICHUAN UNIV
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