CN111825369A

CN111825369A - Lithium slag-based thickening agent and preparation method and application thereof

Info

Publication number: CN111825369A
Application number: CN202010632763.3A
Authority: CN
Inventors: 谭洪波; 李懋高; 张俊杰; 聂康峻
Original assignee: Wuhan University of Technology WUT
Current assignee: Wuhan University of Technology WUT
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2020-10-27
Anticipated expiration: 2040-07-02
Also published as: CN111825369B

Abstract

The invention provides a lithium slag-based thickening agent and a preparation method and application thereof, wherein the lithium slag-based thickening agent comprises the following components in parts by weight of 100: lithium slag: 20-30 parts of a surface modifier: 0.1-0.3 part, dispersion stabilizer: 0.1-0.5 parts of thickening agent: 0.001 to 0.005 part by weight, and the balance of water. According to the invention, the lithium slag, the surface modifier, the dispersion stabilizer and the thickener are compounded, and a certain amount of water is added for wet grinding to prepare the lithium slag-based thickener, when the lithium slag-based thickener is used for cement concrete, the viscosity of slurry can be obviously improved under the use amount of 0.5-5.0%, and the viscosity value of the slurry can be improved by 15-20%.

Description

Lithium slag-based thickening agent and preparation method and application thereof

Technical Field

The invention relates to the technical field of building materials, in particular to a lithium slag-based thickening agent and a preparation method and application thereof.

Background

China is the world with the largest reserve of spodumene, and in the process of producing lithium salt by using a sulfuric acid method for spodumene, 8-10 tons of acid method lithium slag are discharged when one ton of lithium salt is produced. According to the discharge amount, the amount of acid-process lithium slag generated in lithium salt production in China every year is very large. In a large lithium carbonate and lithium ammonia oxidation production enterprise, 16 ten thousand tons of acid method lithium slag are discharged every year, and 40 ten thousand tons of alkaline method lithium slag are accumulated. With the development of lithium salt industry, the discharge amount of acid process lithium slag is increasing day by day, most of the generated waste acid process lining slag is subjected to accumulation and landfill treatment, so that resource waste and environmental pollution are caused, and geological environment risks are caused. Therefore, how to reasonably utilize the lithium slag becomes a problem to be solved urgently, and has important significance for protecting the environment, saving resources and energy.

The thickener (Viscosity-enhancing admixture or Viscosity-modifying admixture) is an admixture capable of improving the Viscosity of a concrete mixture, the application of the thickener in the building industry is started from underwater undispersed concrete, the problems of complex operation and poor effect caused by adding mineral admixtures and controlling water contact during underwater concrete construction are effectively solved, the flocculating capability of the underwater undispersed concrete can be improved by the thickener, the Viscosity of self-compacting concrete is increased, the resilience of sprayed concrete is reduced, the aggregate floating problem of light aggregate concrete can be solved, and the construction performance of low-quality aggregate concrete is improved. However, due to the fact that the thickening agents are various in types and application occasions, compared with the thickening agents at home and abroad, the time for developing the thickening agents at home is relatively late, the research space is wide, the concrete at present needs high working performance, and the thickening agents which are simple in process, high in adaptability and excellent in performance are lacking in the market, so that the requirements of modern engineering are met.

Disclosure of Invention

In view of the above, the invention aims to provide a lithium slag-based thickener to solve the problem of low resource utilization rate of the existing lithium slag.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

the lithium slag-based thickener comprises the following components in parts by weight of 100: lithium slag: 20-30 parts of a surface modifier: 0.1-0.3 part, dispersion stabilizer: 0.1-0.5 parts of thickening agent: 0.001 to 0.005 part by weight, and the balance of water.

Optionally, the surface modifier is sodium polyacrylate; the molecular weight of the sodium polyacrylate is 5000-10000.

Optionally, the dispersion stabilizer is a polycarboxylic acid water reducing agent; the solid content of the polycarboxylate superplasticizer is 40%.

Optionally, the thickener is one of cellulose ether, xanthan gum, polyacrylic acid.

A second object of the present invention is to provide a method for preparing the above-mentioned lithium slag-based thickener, which comprises the steps of:

and putting the lithium slag, the surface modifier, the dispersion stabilizer, the thickening agent and the water into a wet grinder, adding a grinding medium, carrying out wet grinding until the median particle size of the lithium slag is 500-1000 nm, and filtering the grinding medium to obtain the lithium slag-based thickening agent.

Optionally, the grinding media are zirconia balls.

Optionally, the usage amount of the zirconia balls is 1-3 times of that of the lithium slag, and the grading of the zirconia balls is 3.0 mm: 1.7 mm: 0.8 mm-1: 2.

Optionally, the wet grinding time of the wet grinding is 90-120 min.

The third purpose of the invention is to provide an application of the lithium slag-based thickener in cement concrete, wherein the dosage of the lithium slag-based thickener in the application is 0.5-5.0% of the dosage of a cementing material in the cement concrete.

Compared with the prior art, the lithium slag-based thickener has the following advantages:

1. according to the invention, the lithium slag, the surface modifier, the dispersion stabilizer and the thickener are compounded, and a certain amount of water is added for wet grinding to prepare the lithium slag-based thickener, when the lithium slag-based thickener is used for cement concrete, the viscosity of slurry can be obviously improved under the use amount of 0.5-5.0%, and the viscosity value of the slurry can be improved by 15-20%.

2. The lithium slag-based thickener is simple in preparation process and can be prepared only by mixing and wet grinding, raw materials are easy to obtain, and the preparation cost is low.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail with reference to examples.

The raw material ratios, wet milling parameters and slurry consistency properties of the lithium slag-based thickeners of examples 1 to 6 of the present invention are shown in table 1. In each embodiment, the surface modifier is sodium polyacrylate, and the molecular weight of the sodium polyacrylate is 5000-10000; the dispersion stabilizer is a polycarboxylate superplasticizer, and the solid content of the polycarboxylate superplasticizer is 40%.

According to the raw material proportion of each example shown in table 1, the raw materials, namely the lithium slag, the surface modifier, the dispersion stabilizer, the thickening agent and water are put into a wet grinding machine, zirconia balls with the gradation of 3.0 mm: 1.7 mm: 0.8mm ═ 1: 2 are added as grinding media according to the wet grinding parameters of each example shown in table 1, the wet grinding machine is started to carry out wet grinding until the median particle size of the lithium slag reaches the particle size of each example in table 1, and the zirconia balls are filtered out, so that the lithium slag-based thickening agent of each example is obtained. The particle diameters of the examples in table 1 were measured by a laser particle size analyzer.

The concrete mixing amount of the lithium slag-based thickener of the embodiment 1-6 of the invention used in cement concrete is shown in table 1. The improvement of the lithium slag-based thickener in the examples on the consistency of the cement concrete is tested according to GB/T8076-2008 "concrete admixture homogeneity test method", wherein 300g of cement and 87g of water are weighed, and the viscosity is measured by a rotational viscometer.

As can be seen from Table 1, when the lithium slag-based thickener of the embodiments 1-6 of the invention is used in cement concrete, the viscosity of the slurry can be greatly improved, and the viscosity value of the slurry can be improved by 15-20%

TABLE 1

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The lithium slag-based thickener is characterized by comprising the following components in parts by weight of 100: lithium slag: 20-30 parts of a surface modifier: 0.1-0.3 part, dispersion stabilizer: 0.1-0.5 parts of thickening agent: 0.001 to 0.005 part by weight, and the balance of water.

2. The lithium slag-based thickener according to claim 1, wherein the surface modifier is sodium polyacrylate; the molecular weight of the sodium polyacrylate is 5000-10000.

3. The lithium slag-based thickener according to claim 1, wherein the dispersion stabilizer is a polycarboxylic acid water reducing agent; the solid content of the polycarboxylate superplasticizer is 40%.

4. The lithium slag-based thickener according to claim 1, wherein the thickener is one of cellulose ether, xanthan gum and polyacrylic acid.

5. Method for preparing the lithium slag-based thickener according to any of claims 1 to 4, comprising the steps of:

6. The method of manufacturing the lithium slag-based thickener according to claim 5, wherein the grinding medium is zirconia balls.

7. The method for preparing the lithium slag-based thickener according to claim 6, wherein the amount of the zirconia balls is 1 to 3 times of the amount of the lithium slag, and the grading of the zirconia balls is 3.0mm to 1.7mm to 0.8mm which is 1 to 2.

8. The preparation method of the lithium slag-based thickener according to claim 5, wherein the wet milling time of the wet milling is 90-120 min.

9. The use of the lithium slag-based thickener as claimed in any one of claims 1 to 4 in cement concrete, wherein the amount of the lithium slag-based thickener is 0.5 to 5.0% of the amount of the cement material in the cement concrete.