阅读说明：本技术 一种低掺量水泥除铬助磨剂及其制备方法 (Low-doping cement chromium-removing grinding aid and preparation method thereof ) 是由 李耀 陈烽 张辉 宋南京 司宏振 吕晓 秦尤敏 冯恩娟 王志强 刘秀敏 张晓莺 于 2019-09-16 设计创作，主要内容包括：本发明公开了一种低掺量水泥除铬助磨剂及其制备方法,属于水泥外加剂技术领域。该水泥除铬助磨剂由以下重量份的原料制备而成：醇胺类物质20-40份,醇类物质20-40份,三氯化锑25-40份,乙醇5-15份。本发明使用三氯化锑作为六价铬还原剂,能够与助磨剂主要原料醇胺和醇类物质实现良好的配伍性,实现了助磨剂与六价铬还原剂一起复配使用。本发明巧妙的利用三氯化锑与醇胺类物质形成酸碱配合物,不仅保留了Sb<Sup>3+</Sup>对于Cr<Sup>6+</Sup>的还原作用,而且形成的酸碱配合物,较三氯化锑具有更好的稳定性,具有掺量低,生产成本低,使用方便,兼具除铬效果和助磨效果双重作用,具有较好的推广应用价值。(The invention discloses a low-doping cement chromium-removing grinding aid and a preparation method thereof, belonging to the technical field of cement additives. The cement chromium-removing grinding aid is prepared from the following raw materials in parts by weight: 20-40 parts of alcohol amine substances, 20-40 parts of alcohol substances, 25-40 parts of antimony trichloride and 5-15 parts of ethanol. According to the invention, antimony trichloride is used as a hexavalent chromium reducing agent, so that good compatibility with main raw materials of the grinding aid, namely hydramine and alcohols can be realized, and the grinding aid and the hexavalent chromium reducing agent can be compounded for use. The invention skillfully utilizes antimony trichloride and alcamines to form acid-base complexes, thereby not only reserving Sb 3+ for Cr 6+ The reduction effect of the composite material, and the formed acid-base complex have better stability than antimony trichloride, have low doping amount, low production cost and convenient use, have double effects of chromium removal effect and grinding aid effect, and have better popularization and application values.)

1. The low-doped cement chromium-removing grinding aid is characterized by being prepared from the following raw materials in parts by weight: 20-40 parts of alcohol amine substances, 20-40 parts of alcohol substances, 25-40 parts of antimony trichloride and 5-15 parts of ethanol.

2. the low-doped cement chromium-removing grinding aid according to claim 1, wherein the alcamines are one or both of triethanolamine or diethanol monoisopropanolamine.

3. The low-doped cement chromium-removing grinding aid as claimed in claim 1, wherein the alcohol is ethylene glycol.

4. the low-doped cement chromium-removing grinding aid as claimed in claim 2, wherein the triethanolamine is an industrial product with a content of 85%.

5. The low-doped cement chromium-removing grinding aid as claimed in claim 2, wherein the diethanol monoisopropanolamine is an industrial product with a content of 85%.

6. The low-doped cement chromium-removing grinding aid as claimed in claim 3, wherein said ethylene glycol is 95% industrial.

7. the low-doped cement chromium-removing grinding aid as claimed in claim 1, wherein the ethanol is industrial ethanol with a content of 95%.

8. The low-doped cement chromium-removing grinding aid as claimed in claim 1, wherein the amount of the grinding aid added is 0.02-0.04% of the mass of the cement according to the content of hexavalent chromium in the cement.

9. the low-doped cement chromium-removing grinding aid as claimed in claim 1, wherein the antimony trichloride is industrial with a content of 99.5%.

10. A method for preparing a low-doped cement chromium-removing grinding aid as claimed in claim 1, which comprises the following steps:

(1) firstly, dissolving antimony trichloride with a formula amount in ethylene glycol to form a solution;

(2) Adding an alcamines substance into the solution, and introducing cooling water into the reaction kettle; after the dropwise addition is finished and the temperature of the system is stable after the reaction is completed, heating to 60 ℃, and preserving the temperature for 30 minutes;

(3) And finally, adding ethanol to adjust the viscosity of the product, and uniformly stirring.

Technical Field

The invention belongs to the technical field of cement additives, and particularly relates to a low-doping cement chromium-removing grinding aid and a preparation method thereof.

Background

The cement grinding is the most important link in the cement production process, and the power consumption in the grinding process accounts for 60-70% of the total power consumption of the cement production, wherein the grinding power consumption of the finished cement product accounts for 30-40% of the total power consumption. The grinding process of cement is a process that cement material particles are reduced from big to small, and is also an energy conversion process that electric energy is converted into mechanical energy and further converted into surface energy of cement powder, and the energy conversion efficiency determines the utilization rate of energy, so that the utilization rate of energy can be improved by improving the conversion efficiency of energy in the grinding process, and the cost is reduced. The grinding aid can prevent cracks from closing through adsorption in the grinding process so as to promote crack expansion and reduce grinding power consumption in the grinding process, and through dispersion in the powder selection process, the efficiency of the powder selection machine is improved, and qualified fine powder is prevented from returning to the grinding cycle, so that the effects of saving energy and reducing consumption are achieved.

In 9 months in 2015, China officially released national mandatory Standard GB31893-2015 limit and determination method for Water-soluble chromium (VI) in cement, and officially implemented from 10 months and 1 days in 2016, the limit of chromium (VI) in cement is required to be not more than 10 mg/kg. The method for eliminating hexavalent chromium is to reduce toxic hexavalent chromium into nontoxic trivalent chromium by using a reducing agent, the reducing agent is generally ferrous salt, stannous salt and the like, the reducing agent has poor compatibility with alkaline alcohol amine substances and large using amount, can not be compounded with the traditional grinding aid in use generally, is mostly used as a powder product form, has high use cost and is inconvenient to popularize. Based on the problems, the hexavalent chromium reducing material which can be well compatible with main raw materials of grinding aids such as alcamines, alcohols and the like is selected, so that a product which is low in mixing amount and has double effects of the grinding aids and hexavalent chromium reduction is developed.

Disclosure of Invention

In order to solve the problem of compatibility use of the grinding aid and a hexavalent chromium reducing agent, the invention uses antimony trichloride as the hexavalent chromium reducing agent, can realize good compatibility with main raw materials of the grinding aid, namely hydramine and alcohols, and realizes the compound use of the grinding aid and the hexavalent chromium reducing agent.

The invention adopts the following technical scheme:

A low-doping cement chromium-removing grinding aid is prepared from the following raw materials in parts by weight: 20-40 parts of alcohol amine substances, 20-40 parts of alcohol substances, 25-40 parts of antimony trichloride and 5-15 parts of ethanol.

The alcamines are one or two of triethanolamine or diethanol monoisopropanolamine.

the alcohol substance is ethylene glycol.

The triethanolamine is an industrial product with the content of 85 percent.

The diethanol monoisopropanolamine is an industrial product with the content of 85 percent.

The ethylene glycol is 95% of industrial products.

The ethanol is industrial ethanol with the content of 95 percent.

The grinding aid is added in an amount of 0.02-0.04% of the mass of the cement according to the content of hexavalent chromium in the cement.

The antimony trichloride is an industrial product with the content of 99.5 percent.

The preparation method of the low-doped cement chromium-removing grinding aid comprises the following steps:

(1) Firstly, dissolving antimony trichloride with a formula amount in ethylene glycol to form a solution;

(2) adding an alcamines substance into the solution, and introducing cooling water into the reaction kettle; after the dropwise addition is finished and the temperature of the system is stable after the reaction is completed, heating to 60 ℃, and preserving the temperature for 30 minutes;

(3) And finally, adding ethanol to adjust the viscosity of the product, and uniformly stirring.

The invention has the beneficial effects that:

(1) the invention relates to a product which uses antimony trichloride as a hexavalent chromium reduction component, ingeniously utilizes the antimony trichloride and alcamines to form an acid-base complex, and not only Sb is reserved³⁺For Cr⁶⁺The reduction effect of the compound is achieved, and the formed acid-base complex has better stability than antimony trichloride. The compounded alcohol amine compound can also play a role in grinding and dispersing for cement production, and improve the physical properties of cement.

(2) The emulsion-type product provided by the invention has the advantages of low mixing amount, low production cost, convenience in use, dual effects of chromium removal and grinding aid, and good popularization and application values.

Detailed Description

for a further understanding of the invention, preferred embodiments of the invention are described below in conjunction with the examples, but it should be understood that these descriptions are included merely to further illustrate the features and advantages of the invention and are not intended to limit the invention to the claims.