CN115818999A - Method for producing sandstone aggregate from red mud - Google Patents
Method for producing sandstone aggregate from red mud Download PDFInfo
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- CN115818999A CN115818999A CN202211246462.2A CN202211246462A CN115818999A CN 115818999 A CN115818999 A CN 115818999A CN 202211246462 A CN202211246462 A CN 202211246462A CN 115818999 A CN115818999 A CN 115818999A
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Abstract
The invention discloses a method for producing sandstone aggregate by using red mud, which comprises the following steps: s1, preprocessing, dealkalizing and modifying the red mud, and performing acid-base neutralization reaction on multiphase acidic waste and the red mud; s2, primary separation, namely performing solid-liquid-gas separation on the product after the acid-base neutralization reaction of the red mud and the multiphase acidic waste; s3, respectively carrying out secondary separation on the solid and the liquid separated in the step S2 through an electromagnetic separator and a gravity separator, separating the solid into a metal object and a nonmetal object, and separating the liquid into the metal object, the nonmetal and purified water; s4, respectively carrying out pyrolysis reaction on the nonmetal substances; and S5, carrying out activation and stone treatment on the nonmetal to prepare the sandstone aggregate. The method has the advantages of fully treating the red mud, utilizing multiphase acid wastes to achieve the purposes of waste treatment and waste preparation, preparing high-quality sandstone aggregate, efficiently treating the red mud, protecting the environment and saving resources.
Description
Technical Field
The invention relates to the technical field of red mud treatment, in particular to a method for producing sandstone aggregate from red mud.
Background
The red mud is polluting waste residue discharged when aluminum oxide is extracted in the aluminum industry. Generally, 1.0 to 2.0 tons of red mud are additionally produced per 1 ton of alumina. China is the alumina production country which accounts for about 30% of the total world production.
At present, the comprehensive utilization of red mud in China is less than 4.0 percent, and the accumulated stock amount reaches 2 hundred million tons. With the increase of alumina yield and gradual reduction of bauxite products in China, the annual yield of red mud is continuously increased, but the large amount of red mud is piled up, which occupies land, wastes resources and easily causes environmental pollution and potential safety hazard. In view of this, many domestic and foreign research institutions are actively developing research and development on comprehensive utilization of red mud, and some achievements are obtained, but none of the achievements up to now can really realize large-scale industrial application, and none of the achievements can utilize red mud by more than 30%. One of the main reasons for this is the high alkali content of red mud. In the prior art, there are 3 methods for treating red mud, namely a bayer method, a sintering method and a sintering-bayer combination method, and the three treatment methods are all to add alkali into the red mud, so that Na generated in the red mud treatment process 2 The content (mass fraction) of O is as high as 9-11%, belonging to high-risk pollutants. Therefore, the high alkali content is the bottleneck of red mud development and utilization.
Disclosure of Invention
The invention aims to provide a method for producing sandstone aggregate by using red mud, which has the advantages of fully treating the red mud, utilizing multiphase acid waste to achieve the purposes of waste treatment, preparing high-quality sandstone aggregate, efficiently treating the red mud, protecting the environment and saving resources.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for producing sandstone aggregate by using red mud comprises the following steps:
s1, preprocessing, dealkalizing and modifying the red mud, and performing acid-base neutralization reaction on multiphase acidic waste and the red mud;
s2, primary separation, namely performing solid-liquid-gas separation on a product obtained after acid-base neutralization reaction of the red mud and the multiphase acidic waste;
s3, respectively carrying out secondary separation on the solid and the liquid separated in the step S2 through an electromagnetic separator and a gravity separator, separating the solid into a metal object and a nonmetal object, and separating the liquid into the metal object, the nonmetal object and purified water;
s4, respectively carrying out pyrolysis reaction on the nonmetal substances;
and S5, carrying out activation and stone treatment on the nonmetal substances to prepare the sandstone aggregate.
The multiphase acid waste in the step S1 is acid waste gas, acid waste liquid and acid solid waste.
The temperature of the pyrolysis reaction in the step S4 is 200-1000 ℃, and the reaction time is 1-2 hours.
Compared with the prior art, the invention has the advantages that: the red mud is made into cement, ceramics and additives, bricks and permeable bricks, artificial sandstone aggregates and other large-scale green building materials and roadbed industrialized application through activating petrochemical treatment, wherein the large-scale application of the artificial sandstone aggregates has great significance, and the passive situation that China spends a large amount of imported sandstone can be turned.
Detailed Description
The present invention will be further explained below.
In one embodiment, a method for producing sand aggregate from red mud comprises the following steps:
s1, preprocessing, dealkalizing and modifying red mud, putting the red mud into a reaction tank, and introducing multiphase acid waste into the reaction tank to enable the red mud and the multiphase acid waste to generate acid-base neutralization reaction; the multiphase acidic waste is acidic waste gas, acidic waste liquid and acidic solid waste, wherein the acidic waste gas can be the acidic waste gas which is not subjected to purification treatment in the chemical industry, discharged carbon dioxide and the like, such as the waste gas which is not subjected to dust removal, desulfurization and denitration in a coal-fired power plant, a coal-fired blast furnace, a coal-fired boiler and the like, and meanwhile, the red mud is porous, so that dust, sulfide ions, nitrate ions and the like in the waste gas can be adsorbed, the cost for treating the waste gas in the chemical industry is greatly reduced, and on the other hand, CO in the waste gas is utilized 2 Has great significance for carbon emission reduction in the chemical industry.
The acid waste liquid can be acid waste liquid, acid waste water and the like generated in various industries; the acidic solid waste can be acid waste residue, acid sludge and the like which are not subjected to purification treatment in the industries of chemical industry, mining industry and the like; the large-scale low-cost dealkalization modification treatment of the red mud is realized by reasonably utilizing multiphase acid waste, and the treatment of waste by waste is realized, so that the treatment cost of the red mud and industrial waste is reduced.
S2, primary separation, namely performing solid-liquid-gas separation on the product after the acid-base neutralization reaction to separate the product into three substances, namely solid, liquid and gas, and collecting the separated gas, purifying the gas by a gas purification device and then discharging the gas.
And S3, respectively carrying out secondary separation on the solid and the liquid separated in the step S2 through an electromagnetic separator and a gravity separator, separating the solid into a metal object and a nonmetal object, and separating the liquid into the metal object, the nonmetal and purified water, wherein the metal object mainly contains metal ions such as iron and aluminum, and the metal object and the nonmetal object are both solid.
And S4, carrying out pyrolysis reaction on the nonmetal substances, wherein the temperature of the pyrolysis reaction is 200-1000 ℃, and the reaction time is 1-2 hours.
And S5, activating and stoning the nonmetal substances after the pyrolysis reaction. The activating petrochemical treatment is a technology of naturally condensing complex component powder and liquid into high-strength ore bodies through an adhesive under the condition of no heating, and crushing nonmetal substances which are separated from high-value components (such as metal ions such as aluminum, calcium and the like) and activated and mineralized into cement, ceramics, additives, bricks, permeable bricks, artificial sandstone aggregates and other large-scale green building materials and roadbed industrial applications through a crusher, wherein the large-scale application of the artificial sandstone aggregates has great significance, and the passive situation that China spends a large amount of foreign exchange imported sandstone can be turned; the adhesive comprises natural adhesive and synthetic adhesive, wherein the natural adhesive is taken from substances in the nature. Comprises biological adhesives such as starch, protein, dextrin, animal glue, shellac, hide glue, rosin and the like; mineral binders such as asphalt; the synthetic adhesive means an artificially synthesized substance, and includes inorganic adhesives such as water glass, and organic adhesives such as synthetic resins and synthetic rubbers.
In another embodiment, the non-metal object can be subjected to high-temperature activation treatment at a temperature of more than 80 ℃, the non-metal object can be directly used as soil of land for construction after being subjected to high-temperature activation and harmless treatment, and meanwhile, the non-metal object can be added with breeding wastes such as straws, livestock and poultry manure, kitchen waste, sewage plant sludge, food production leftovers, waste residues and other organic wastes, and the non-metal object can be subjected to high-temperature activation to be used for land restoration and re-cultivation of lands such as waste residue storage yards such as red mud and the like, or land improvement, or re-cultivation soil of saline-alkali lands and desertification lands.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; while the invention has been described with reference to specific embodiments and applications, it will be apparent to those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A method for producing sandstone aggregate by using red mud is characterized by comprising the following steps: the method comprises the following steps: s1, preprocessing, dealkalizing and modifying the red mud, and performing acid-base neutralization reaction on multiphase acidic waste and the red mud;
s2, primary separation, namely performing solid-liquid-gas separation on the product after the acid-base neutralization reaction of the red mud and the multiphase acidic waste;
s3, respectively carrying out secondary separation on the solid and the liquid separated in the step S2 through an electromagnetic separator and a gravity separator, separating the solid into a metal object and a nonmetal object, and separating the liquid into the metal object, the nonmetal and purified water;
s4, carrying out pyrolysis reaction on the non-metal substances respectively;
and S5, carrying out activation and stone treatment on the nonmetal substances to prepare the sandstone aggregate.
2. The method for producing sand aggregate from red mud according to claim 1, wherein the method comprises the following steps: the multiphase acid waste in the step S1 is acid waste gas, acid waste liquid and acid solid waste.
3. The method for producing sand aggregate from red mud according to claim 1, wherein the method comprises the following steps: the temperature of the pyrolysis reaction in the step S4 is 200-1000 ℃, and the reaction time is 1-2 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211246462.2A CN115818999A (en) | 2022-10-12 | 2022-10-12 | Method for producing sandstone aggregate from red mud |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211246462.2A CN115818999A (en) | 2022-10-12 | 2022-10-12 | Method for producing sandstone aggregate from red mud |
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| CN115818999A true CN115818999A (en) | 2023-03-21 |
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| CN202211246462.2A Pending CN115818999A (en) | 2022-10-12 | 2022-10-12 | Method for producing sandstone aggregate from red mud |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101927255A (en) * | 2009-09-03 | 2010-12-29 | 昆明理工大学 | Method for carbon dioxide suspension dealkalization of red mud for alumina plant |
| CN102500592A (en) * | 2011-09-16 | 2012-06-20 | 茌平县信发盛吉赤泥处理有限公司 | Method for comprehensively utilizing alumina red mud |
| CN103073066A (en) * | 2012-11-01 | 2013-05-01 | 吕富华 | Innocent treatment and resource utilization method for red mud |
| KR101964794B1 (en) * | 2018-10-31 | 2019-04-02 | 우석대학교 산학협력단 | Red mud composition for efflorescence reduction |
| CN115057689A (en) * | 2022-08-19 | 2022-09-16 | 山东理工大学 | Production equipment and method of red mud ceramsite sand |
-
2022
- 2022-10-12 CN CN202211246462.2A patent/CN115818999A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101927255A (en) * | 2009-09-03 | 2010-12-29 | 昆明理工大学 | Method for carbon dioxide suspension dealkalization of red mud for alumina plant |
| CN102500592A (en) * | 2011-09-16 | 2012-06-20 | 茌平县信发盛吉赤泥处理有限公司 | Method for comprehensively utilizing alumina red mud |
| CN103073066A (en) * | 2012-11-01 | 2013-05-01 | 吕富华 | Innocent treatment and resource utilization method for red mud |
| KR101964794B1 (en) * | 2018-10-31 | 2019-04-02 | 우석대학교 산학협력단 | Red mud composition for efflorescence reduction |
| CN115057689A (en) * | 2022-08-19 | 2022-09-16 | 山东理工大学 | Production equipment and method of red mud ceramsite sand |
Non-Patent Citations (1)
| Title |
|---|
| 王水远;何玲芳;胡承伟;: "赤泥治理酸性煤矿废水的机理分析", 环保科技, no. 01 * |
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