Phosphogypsum hardening agent and preparation method and application thereof

A technology for phosphogypsum and hardener, which is applied in the field of phosphogypsum hardener and its preparation, can solve the problems of poor performance and difficulty in processing and utilizing a large amount of phosphogypsum, and achieves improved retardation properties, good anti-carbonation performance, and improved anti-scour performance. Effect

Pending Publication Date: 2022-03-25
湖北昌耀新材料工程技术研究有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The object of the present invention is to provide a phosphogypsum hardening agent and its preparation method and application. The phosphogypsum hardening agent can solve the current problem of difficult treatment and utilization of phosphogypsum caused by poor performance of phosphogypsum

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  • Phosphogypsum hardening agent and preparation method and application thereof
  • Phosphogypsum hardening agent and preparation method and application thereof
  • Phosphogypsum hardening agent and preparation method and application thereof

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preparation example Construction

[0037] In the present invention, the preparation method of the modifying agent preferably includes the following steps: drying carbide slag, steel slag and quicklime respectively, so that the moisture content of the calcium carbide slag, steel slag and quicklime are independently ≤5wt%, and then carry out mixed to obtain the modifier. In the present invention, the mixing method is preferably grinding; the present invention does not have any special limitation on the grinding process, and it can be carried out by a process well known to those skilled in the art.

[0038] In the present invention, the mass percentage of CaO in the modifier is preferably ≥ 60 wt%, more preferably ≥ 65 wt%.

[0039] In the present invention, controlling the calcium oxide in the modifying agent within the above content range is beneficial to ensure the chemical properties of the modifying agent.

[0040] Based on the parts by weight of the phosphogypsum, the phosphogypsum hardening agent of the pres...

Embodiment 1

[0062] The composition of phosphogypsum hardener:

[0063] Phosphogypsum: 1660 parts; undisturbed phosphogypsum stored for more than 3 years, with a moisture content of 13.55wt%, CaSO 4 The content is 91wt%, the content of water-soluble phosphorus is 0.28wt%, the content of water-soluble fluorine is 0.08wt%, and the pH value is 4.3;

[0064]Modifier (CaO content: 64.8%): 24 parts; composition: calcium carbide slag 35%, steel slag 30%, quicklime 35%; calcium carbide slag, steel slag and quicklime are dried to a moisture content of ≤ 5% and then ground mix;

[0065] Active mineral admixture (the sieve residue after passing through a 45μm aperture sieve is 15.2%): 111.8 parts; composition: mineral powder, fly ash and silica fume with a mass ratio of 8:1:1; the mineral powder is S95 grade Blast furnace slag powder, activity index 99%; fly ash is class II class C fly ash; SiO in silica fume 2 The content is 97%;

[0066] Cement: 129.75 parts; the cement is P.O 42.5R ordinary Po...

Embodiment 2

[0077] The composition of phosphogypsum hardener:

[0078] Phosphogypsum: 1660 parts; undisturbed phosphogypsum stored for more than 2 years, with a moisture content of 15.25wt%, CaSO 4 The content is 87wt%, the content of water-soluble phosphorus is 0.42wt%, the content of water-soluble fluorine is 0.09wt%, and the pH value is 3.6;

[0079] Modifier (CaO content: 62.4%): 28 parts; composition: 40% carbide slag, 30% steel slag, 30% quicklime; dry carbide slag, steel slag and quicklime separately until the moisture content is ≤5%, then grind mix;

[0080] Active mineral admixture (the sieve residue after passing through a 45 μm aperture sieve is 12.8%): 120 parts; composition: mineral powder; the mineral powder is S105 grade granulated blast furnace slag powder, and the activity index is 108%;

[0081] Cement: 126 parts; the cement is P.O 42.5R ordinary Portland cement, and the 3d compressive strength is 2.0MPa;

[0082] Metakaolin: 33 parts; the metakaolin is low-temperatur...

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Abstract

The invention relates to the technical field of harmless treatment of solid wastes, in particular to a phosphogypsum hardening agent as well as a preparation method and application thereof. The ardealite hardening agent provided by the invention is prepared from the following preparation raw materials in parts by weight: 1580 to 1780 parts of ardealite, 10 to 30 parts of a modifier, 100 to 130 parts of an active mineral admixture, 100 to 140 parts of cement, 15 to 40 parts of metakaolin, 10 to 35 parts of coal gangue slag, 5 to 10 parts of an early strength agent and 50 to 80 parts of water. The ardealite hardener can effectively enhance the early strength of ardealite, reduce the initial setting time and the final setting time of the hardened ardealite, improve the durability, the wear corrosion resistance and the erosion resistance of a material after ardealite hardening, and meanwhile, the material after ardealite hardening can meet the environmental quality standards of soil, surface water and underground water, and has a good application prospect. The problem that a large amount of ardealite is difficult to treat and utilize due to poor ardealite performance at present is solved.

Description

technical field [0001] The invention relates to the technical field of harmless treatment of solid waste, in particular to a phosphogypsum hardening agent and its preparation method and application. Background technique [0002] Phosphogypsum is the waste residue produced by the wet phosphoric acid process of phosphorus chemical industry, and it is one of the solid wastes with huge discharge in the chemical industry. At present, most phosphogypsum is disposed of in two ways: open-air stacking and dumping into the sea. The domestic stockpiles have exceeded 500 million tons, and the annual discharge is more than 80 million tons, and the effective utilization rate is less than 20%. Phosphogypsum contains a lot of pollutants, and its random discharge and accumulation seriously damages the ecological environment, not only pollutes groundwater resources, but also causes waste of land resources. "Carbon Peak Action Plan Before 2030" "Circular Economy Helps Carbon Reduction Action"...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B111/20
CPCC04B28/143C04B2111/00017C04B2201/50C04B2111/20C04B22/0006C04B22/064C04B14/106C04B18/10C04B2103/10C04B18/141C04B18/08C04B7/02C04B18/146
Inventor 吕伟吴赤球胡彪龚文辉
Owner 湖北昌耀新材料工程技术研究有限责任公司
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