Cement hexavalent chromium reducing agent and preparation method thereof

A hexavalent chromium and reducing agent technology, applied in the field of building material additives, can solve problems such as reduction of reducibility, removal of crystal water, environmental and ecological impact, and achieve strong reducibility, strong high temperature stability and excellent effects

Active Publication Date: 2022-06-21
SICHUAN MIANZHU AODONG CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to factors such as unstable crystal water and poor chemical stability, the exposure of ferrous sulfate to high temperature environment or air will lead to the removal of crystal water, and after losing the protection of crystal water, Fe 2+ easily oxidized by air to Fe 3+ , reducing its reducibility in the process of cement use, which is unfavorable to the reduction of hexavalent chromium in cement, and has a huge impact on the environment and ecology

Method used

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  • Cement hexavalent chromium reducing agent and preparation method thereof

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Embodiment 1

[0031]This embodiment provides a hexavalent chromium reducing agent for cement. The raw materials of the reducing agent and their mass percentages are: 80% of silicon micropowder on the surface rich in hydroxyl groups and 20% of ferrous sulfate monohydrate.

[0032] The preparation method of the cement hexavalent chromium reducing agent in this embodiment is as follows: ferrous sulfate is configured into a saturated solution, then sprayed on the surface of the silica micropowder, and granulated after high-speed stirring to obtain the cement hexavalent chromium reducing agent.

Embodiment 2

[0034] This embodiment provides a hexavalent chromium reducing agent for cement. The raw materials of the reducing agent and their mass percentages are: 70% of nano-silica on a hydroxyl-rich surface, 20% of ferrous sulfate monohydrate and 10% of ferrous sulfate heptahydrate.

[0035] The preparation method of the cement hexavalent chromium reducing agent in this embodiment is as follows: ferrous sulfate is configured into a saturated solution, then sprayed on the surface of nano-silica, and granulated after high-speed stirring to obtain the cement hexavalent chromium reducing agent.

Embodiment 3

[0037] This embodiment provides a hexavalent chromium reducing agent for cement. The raw materials of the reducing agent and their mass percentages are: 30% of nano-silica on a hydroxyl-rich surface, 40% of glass microbeads on a hydroxyl-rich surface, and 20% of ferrous sulfate monohydrate. % and ferrous sulfate heptahydrate 10%.

[0038] The preparation method of the cement hexavalent chromium reducing agent in this embodiment is as follows: ferrous sulfate is configured into a saturated solution, then sprayed on the surface of the mixed nano-silica and glass microbeads, and granulated after high-speed stirring to obtain cement hexavalent Chromium reducing agent.

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Abstract

The invention discloses a cement hexavalent chromium reducing agent and a preparation method thereof. The cement hexavalent chromium reducing agent comprises the following raw materials in percentage by mass: 30-99% of a hydroxyl-containing dispersing agent and 1-70% of a ferrous sulfate solution. The cement hexavalent chromium reducing agent is simple in preparation method and low in cost, dispersing agent coated ferrous sulfate hydrophilic microspheres are formed by means of the dispersing agent, Fe < 2 + > can be prevented from making contact with oxygen under the high-temperature condition, the cement hexavalent chromium reducing agent still has excellent reducibility and stability under the high-temperature environment, hexavalent chromium in cement can be stably reduced into trivalent chromium, and the cement hexavalent chromium reducing agent is suitable for large-scale production. And practical popularization and application are facilitated.

Description

technical field [0001] The invention belongs to the technical field of building materials additives, and particularly relates to a cement hexavalent chromium reducing agent and a preparation method thereof. Background technique [0002] As the basic material of modern architecture, the quality and safety of cement directly affects human health and ecological environment. With the continuous construction of infrastructure in my country, the huge cement usage has led to the cement output ranking first in the world for many years. In the production process of cement, due to raw materials, production technology and other reasons, cement and its products often contain a small amount of lead, cadmium, chromium and other toxic and harmful substances, of which hexavalent chromium is the most serious. Hexavalent chromium ions have harmful effects on the human body, ranging from skin ulcers, dermatitis, etc., to skin or organ cancer. Secondly, cement products in contact with soil or...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14
CPCC04B40/0039C04B22/149C04B14/062C04B14/24
Inventor 郭兴华朱伟蒋俊李军缪冰海马锦
Owner SICHUAN MIANZHU AODONG CEMENT CO LTD
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