JPS5978961A - Blast furnace slag granulation aid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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, blast furnace slag, which is widely used next to Portland cement, is a mixture of blast furnace slag, which is obtained by rapidly cooling and pulverizing slag from a blast furnace for iron-making, and Portland cement. 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. 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. The current situation is that it has been crushed.

In view of the current situation, the present inventors devoted themselves to the development of a grinding aid, and as a result, a compound containing one or more selected from the group consisting of sulfosuccinic acid sialkyl ester salts and sulfated fatty acid salts was developed. It was discovered that it is extremely effective as a grinding aid, and the present invention was completed.

In the present invention, various ester salts are used as the sulfosuccinic acid sialkyl ester salt, and a typical example thereof is sulfosuccinic acid dioctyl ester salt.

Sulfated fatty acids include not only α-sulfonated fatty acids but also sulfuric esters of unsaturated fatty acids or epoxidized unsaturated fatty acid esters, and alkali metal salts, ammonium salts, Organic amine salts are used as blast furnace slag grinding aids in the present invention.

The above-mentioned one or more compounds selected from the group consisting of sulfosuccinic acid sialkyl ester salts and sulfated fatty acid salts may be used as 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 a grinding aid.

These salt aids 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 effect of crushing blast furnace slag, it is preferable to use 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 such as.

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.

The above-mentioned grinding aid of the present invention has a zero
．． By adding in an amount of 0.005 to 0.5 wt%, the grinding efficiency of blast furnace slag grinding can be increased and the powder settling time can be significantly shortened.

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 pulverization method was to put 2.51c9 cast iron balls each with a diameter of 30 mm and 17 fins into a test pot mill, and then thoroughly dry blast furnace water scythe slag (manufactured by Nippon Steel Chemical Industry Co., Ltd.) 6009 and the required amount for pulverization. An auxiliary agent (hereinafter simply referred to as auxiliary agent) is added, and the mixture is pulverized at a rotational speed of 85 rpm. For evaluation of the crushing effect, samples were taken every hour, and the Blaine specific surface area of each sample was measured by the method of J Engineering 5-R-5201.From the graph curve of the crushing time and the plane specific surface area value, the plane specific surface area value was 350oci7g. The pulverization time required to obtain this was determined, and the pulverization times were compared. All percentages shown below are wt%.

Example 1 According to the above method, dioctyl sodium salt of sulfophylphosphate (Aerosol QT) was used as an auxiliary agent.

Wako Pure Chemical Industries, Ltd.) 16.7% aqueous solution 1.87
(0.3% based on blast furnace slag) was added and pulverized. The grinding time was 470 minutes.

Example 2 Dioctyl sodium sulfosuccinate salt 5 as an auxiliary agent
0.189% of 0% ethylene glycol solution (0.03% based on blast furnace slag) was added and pulverized.

The grinding time was 400 minutes.

Example 3 As an auxiliary agent, a 50% aqueous solution of the sodium salt of tall oil fatty acid was epoxidized using its unsaturated bonds and then sulfuric acid esterified.
．． 06%) was added and ground. The grinding time was 440 minutes.

Comparative Example 1 Blast furnace slag was pulverized as it was without using any auxiliary agents. The pulverization time was 480 minutes.

Comparative Example 2 Only water was used as an auxiliary agent, and water 1. s9 (0.3% based on blast furnace slag) was added and pulverized. Grinding time is 595
It was a minute.

The above-mentioned Examples and Comparative Examples are summarized in the following table, and it is clear that the effect of the grinding aid of the present invention is good.

Claims (1)

[Claims] (1) A blast furnace slag grinding aid characterized by containing one or more compounds selected from the group consisting of sulfosuccinic acid sialkyl ester salts and sulfated fatty acid salts.