CN-116750981-B - Low-alkali silicate cement with cobalt slag as raw material and preparation method thereof

Abstract

The invention belongs to the technical field of cement production, and provides low-alkali silicate cement with cobalt slag as a raw material and a preparation method thereof, wherein the low-alkali silicate cement comprises the following steps of S1, preparing the raw material; S2, preparing an exciting agent, S21, preparing a solution A, S22, preparing a solution B, and S3, preparing low-alkali silicate cement, wherein the industrial solid waste cobalt slag with stable performance and low price is used as a mixed material of the low-alkali silicate cement, and the chelating agent and the exciting agent are introduced to improve and improve the activity of the low-alkali silicate cement.

Inventors

• WANG RONGE
• XU YUANZHENG
• SHEN PENG
• Cheng Quanan
• CHEN HANWU
• ZHOU XIANKAI

Assignees

• 娲石水泥集团有限公司

Dates

Publication Date

20260512

Application Date

20230614

Claims (4)

1. 1. The preparation method of the low-alkali silicate cement with cobalt slag as the raw material is characterized by comprising the following steps: S1, preparing raw materials, Drying, grinding and sieving cement clinker at 105-110 ℃ until the specific surface area of particles is more than 300m < 2 >/kg, drying, grinding and sieving gypsum at 75-80 ℃ until the specific surface area of particles is more than 300m < 2 >/kg, drying cobalt slag with fineness of more than 200 meshes at 105-110 ℃ for later use; s2, preparing an exciting agent, The preparation of the excitant solution is divided into a first solution and a second solution, which are required to be prepared respectively, and then the first solution and the second solution are filtered and stored respectively, and in the use process, the first solution and the second solution are evenly mixed according to the mass ratio of 4:1 for use; s21, preparing a first solution, Firstly, respectively dissolving sodium sulfate, sodium hexametaphosphate and pH value regulator sodium hydroxide and hydroxypropyl methyl cellulose by deionized water to prepare four solutions, and uniformly mixing the four solutions according to the mass ratio of 1:1:0.5:0.05; s22, preparing a solution B, Diluting the polycarboxylate mother liquor with the concentration of 40% into a polycarboxylate solution with the concentration of 25% by deionized water; s3, preparing low-alkali silicate cement, The mass ratio of the cement clinker to the gypsum to the cobalt slag to the chelating agent is 55-90:1-10:5-40:0.5-2:1-10, the cobalt slag is treated by the chelating agent, then the cobalt slag and the exciting agent are uniformly mixed according to a certain proportion and ground, the prepared cement clinker and the gypsum are uniformly mixed according to a certain proportion, and the prepared low-alkali silicate cement is prepared by uniformly mixing the above materials; In the step S3, in order to reduce the influence of metal in the cobalt slag on the material performance, firstly, ethylenediamine tetramethylene sodium phosphate or amine trimethylidene phosphate is used as a chelating agent to prepare a solution with the concentration of 20%, a certain amount of the solution is added into the cobalt slag, the solution is fully and uniformly stirred for more than eight hours, the temperature is kept at 105 ℃, and the solution is dried for twelve hours.
2. 2. The method for preparing low-alkali silicate cement by taking cobalt slag as a raw material according to claim 1, wherein in the step S3, the mass ratio of cement clinker, gypsum, cobalt slag, chelating agent and exciting agent is 55:4:34:0.5:7.
3. 3. The method for preparing low-alkali silicate cement by taking cobalt slag as a raw material according to claim 1, wherein in the step S3, the mass ratio of cement clinker, gypsum, cobalt slag, chelating agent and exciting agent is 80:2:10:2:8.
4. 4. A low alkali silicate cement using cobalt slag as a raw material, characterized in that it is produced by a method for producing a low alkali silicate cement using cobalt slag as a raw material according to any one of claims 1 to 3.

Description

Low-alkali silicate cement with cobalt slag as raw material and preparation method thereof Technical Field The invention belongs to the technical field of cement production, and particularly relates to low-alkali silicate cement with cobalt slag as a raw material and a preparation method thereof. Background The general silicate cement is a hydraulic cementing material prepared from silicate cement clinker, a proper amount of gypsum and a specified mixed material. The cement industry belongs to products with high resource consumption, and the comprehensive utilization of various tailings is very important for preparing cement. The metal cobalt is a national strategic resource, but cobalt slag after cobalt smelting occupies a large amount of land, wastes a large amount of funds and severely pollutes the environment. Metals such as cobalt, zinc and the like in tailings can be recovered by means of a method. The cobalt slag used for smelting cobalt is industrial slag of wet smelting. Each kind of cobalt slag generated each year has millions of tons, if the cobalt slag is not fully utilized, the cobalt slag is continuously piled up, so that the environment pollution is caused, and the huge waste of resources is also caused. The cobalt slag contains a large amount of SiO 2, caO and Al 2O3, which are all components necessary for carrying out pozzolanic reaction. Under the actions of mechanical excitation, composite excitation and the like, the green cementing material can be prepared. As cobalt slag containing cobalt itself has important recovery value, most of the literature currently focuses on how to recover and reuse cobalt slag. Document 1 (Ma Feifei, yang, dou Jiangmin) discloses a method for recycling valuable metals such as zinc and cobalt by a cobalt slag water washing-conversion-oxidation leaching process, and obtains optimal process parameters by aiming at the problems of high zinc content, low cobalt content, high recovery difficulty and the like of organic cobalt slag generated by a novel reagent cobalt removal process. The cobalt element is enriched to more than 10%, the cobalt removing reagent can be recycled, the process operation is simple, and the method can be in seamless connection with a zinc hydrometallurgy system. Document 2 (Bai Penghui, zhang Xu, liu Jin, xiaoxiang, liu Mengyu, zhang Yunpeng. Wet zinc smelting purifying cobalt slag oxidizing precipitation method for separating and recovering cobalt and nickel, nonferrous metal engineering 2022 (12) 60-66) is to treat multi-metal cobalt slag produced by wet zinc smelting by adopting one-stage sulfuric acid leaching-two-stage high cobalt slag neutralization, and the obtained leaching solution with higher cobalt content is sequentially treated by hydrogen peroxide oxidizing iron removal, zinc powder replacement cadmium removal, nickel removal reagent nickel removal, sodium persulfate selective oxidation manganese removal and sodium persulfate oxidizing cobalt precipitation. The result shows that under the optimal acid leaching conditions that the concentration of sulfuric acid is 150g/L, the temperature is 80 ℃ and the leaching time is 120min, the cobalt precipitation rate of sodium persulfate reaches 99.98%, the cobalt content of cobalt slag is 49.75%, and the solution after cobalt precipitation returns to a zinc hydrometallurgy production system to recycle metallic zinc, so that the separation and recovery of metallic resources in the slag are realized. Document 3 (Zhang Gongju, wang Youchen, du Ning. Improved process for recovering cobalt from nickel-cobalt slag, research on improvement of process, chinese nonferrous metallurgy, 2020 (49) 42-45) uses the byproduct cobalt slag of zinc hydrometallurgy to perform tests of oxidizing and precipitating cobalt by various oxidants, and determines that the independent acid washing-potassium permanganate oxidizing and precipitating method of the nickel-cobalt slag is superior to other schemes for recovering cobalt. The experimental flow and parameters of the process, key control points of the process and the like are illustrated and analyzed, and the experimental result shows that the process flow is short, the production efficiency is high, the cost of 8 ten thousand yuan of medicaments is saved for each 1t of recovered cobalt, and the cobalt content of the product cobalt slag is improved by 2 times compared with the cobalt slag recovered by the process before improvement, so that the process is convenient for market sales. In recent years, research and application of cobalt slag in other industries have been carried out, and document 4 (Jingqingxiu, natawei, huang Xiaodong, wang Wei, zhang Zehui, zhang Chengxi. Water treatment technology 2020 (10): 28-32) reports that cobalt slag, river sand, ca (OH) 2、NaHCO3 and saw dust are used as raw materials, a proper amount of water is added for mixing, wet granulation (with the particle size of 4-9 mm) is carried out after uniform mixing, the mixture is dr