JPH0228526B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a blast furnace slag crushing aid added when blast furnace slag is crushed. As is well known, the second most widely used high cement after Portland cement is a mixture of Portland cement and blast furnace slag, which is obtained by rapidly cooling and pulverizing slag from blast furnaces for steel manufacturing. Therefore, in order to use blast furnace slag as a raw material for cement, it is necessary to pulverize the blast furnace slag, but since blast furnace slag is glassy and has a high crushing strength, it requires a large amount of crushing energy compared to Portland cement. Therefore, the development of an effective grinding aid has been long awaited. Conventionally, methods of adding aqueous solutions such as diethylene glycol and triethanolamine as grinding aids to blast furnace slag have been known, but these methods have a better grinding effect than adding only water to blast furnace slag. Although these methods are good, it is actually faster to grind the blast furnace slag without adding any grinding aids than these methods. Currently, it is being crushed. In view of the current situation, the present inventors devoted themselves to the development of a grinding aid, and as a result, a mixture of one or more selected from the group consisting of fatty acids, rosin, and salts thereof has been found to be highly effective as a grinding aid. They found that it is effective and completed the present invention. In the present invention, as the fatty acid, animal and vegetable oil fatty acids or synthetic fatty acids such as beef tallow oleic acid, tall oil fatty acid, soybean oil fatty acid, coconut oil fatty acid, palm oil fatty acid, and castor oil fatty acid are used.
Examples of the rosin include gum rosin, turmeric rosin, and tall rosin, as well as rosin treated with formaldehyde, etc., and rosin added with maleic acid, fumaric acid, acrylic acid, etc. In addition, the above fatty acid and rosin salts include lithium,
In addition to alkali metal salts such as sodium and potassium salts and ammonium salts, salts of organic amines such as alkanolamines such as ethanolamine and propanolamine, and alkylamines are used. A grinding aid in which one or a mixture of two or more selected from the group consisting of fatty acids, rosins, and salts thereof as described above is used as it is, in the form of an aqueous solution, or in the form of a solution of glycols or glycol ethers. It can be used as Fatty acids, rosins, and their salts can be made into a solution to lower their viscosity, so they can be added more uniformly as grinding aids. However, since water has the property of suppressing the blast furnace slag crushing effect, it is preferable to use water such as ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol, tripropylene glycol, glycerin, etc. rather than using it in the form of an aqueous solution. A preferable pulverizing effect can be obtained by using glycols or glycol ethers in the form of a solution. When used in the form of an aqueous solution, better results can be obtained by adding a highly concentrated aqueous solution than by increasing the amount of the aqueous solution added. By adding the above-mentioned grinding aid of the present invention in an amount of 0.005 to 0.5 wt% to blast furnace slag, it is possible to improve the grinding efficiency of blast furnace slag grinding and to significantly shorten the grinding time. Next, several examples and comparative examples will be shown in which the effects of the grinding aid of the present invention were measured using a test pot mill. The grinding method is a test pot mill with a diameter of 30 mm and 17
2.5 kg of each 2.5 mm cast iron balls were added, and then 600 g of thoroughly dried blast furnace water sizing slag (manufactured by Nippon Steel Chemical Industry Co., Ltd.) and the required amount of grinding aids (hereinafter simply referred to as aids) were added. , grinding at a rotation speed of 85 rpm. To evaluate the crushing effect, sampling was performed every hour, and the plane specific surface area of each sample was measured using the JIS-R-5201 method. From the graph curve of the crushing time and plane specific surface area value, the plane specific surface area value was 3500 cm ² / The grinding time required to obtain g was determined, and the grinding times were compared. below%
All values shown are wt%. Example 1 According to the above method, tall oil fatty acid was used as an auxiliary agent.
0.18g (0.03% based on blast furnace slag) was added and ground. The grinding time was 420 minutes. Example 2 16.7% of soybean oil fatty acid sodium salt as auxiliary agent
Add 1.8g of aqueous solution (0.3% to blast furnace slag),
Shattered. The grinding time was 405 minutes. Example 3 1.8 g of a 16.7% aqueous solution of tall oil fatty acid triethanolamine salt as an auxiliary agent (0.3% based on blast furnace slag)
was added and crushed. The grinding time was 395 minutes. Example 4 0.18 g of a 50% ethylene glycol solution of tall oil fatty acid triethanolamine salt (0.03% based on blast furnace slag) was added as an auxiliary agent and pulverized. The grinding time was 410 minutes. Example 5 1.8 g of a 10% aqueous solution of coconut oil fatty acid sodium salt (0.3% based on blast furnace slag) was added as an auxiliary agent and pulverized. The grinding time was 495 minutes. Example 6 1.8 g of a 16.7% aqueous solution of potassium salt of gum rosin containing 25% maleated gum rosin as an auxiliary agent
(0.3% based on blast furnace slag) was added and pulverized. The grinding time was 410 minutes. Comparative Example 1 Grinding was carried out without using an auxiliary agent. The grinding time was 480 minutes. Comparative Example 2 1.8g of water was used as an auxiliary agent (0.3g for blast furnace slag).
%) was added and ground. The grinding time was 595 minutes. Comparative Example 3 Triethanolamine 16.7% aqueous solution as auxiliary agent
1.8g (0.3% based on blast furnace slag) was added and pulverized. The grinding time was 505 minutes. The following table shows the above examples and comparative examples, and it is clear that the auxiliary agent of the present invention is superior. 【table】

Claims (1)

[Scope of Claims] 1. A blast furnace slag grinding aid characterized by containing one or more selected from the group consisting of fatty acids, rosin, and salts thereof. 2. The blast furnace slag grinding aid according to claim 1, wherein the fatty acid is an animal or vegetable oil fatty acid. 3. The blast furnace slag grinding aid according to claim 1, wherein the fatty acid and rosin salts are alkali metal salts, ammonium salts, or organic amine salts.