JPS58202041A - Preparation of high strength iron oxide desulfurizing agent - Google Patents

Abstract

PURPOSE:To obtain a high strength iron oxide desulfurizing agent suitable for use in a dry desulfurizing method, by a method wherein water is added to a mixture of an iron oxide powder and clay to be kneaded therewith and the kneaded mixture is molded to be baked in an oxygen atmosphere within a range of a specific temp. CONSTITUTION:About 25-100pts.wt. clay is mixed with 100pts.wt. iron oxide powder. This mixture is kneaded in the presence of a proper amount of water while the kneaded mixture is molded into a predetermined shape with a predetermined dimension to be dried. In the next step, the dried molded one is baked in an acidic atmosphere under a temp. condition of 300-600 deg.C. By this procedure, a high strength iron oxide molded body suitable for a desulfurizing agent in a dry desulfurizing method is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in granular iron oxide used as a desulfurization agent in a dry desulfurization method for hydrogen sulfide-containing scum.

A desulfurization method using granular iron oxide in a moving bed is known as the Kasdecnik method as one of the dry detransmission methods for decomposed hydrogen-containing scum. In this method, a moving bed of granular iron oxide is desulfurized by supplying hydrogen sulfide-containing gas coexisting with coupled oxygen, and the desulfurizing agent, which has been converted to iron sulfide during desulfurization, is converted back to iron oxide by the coexisting oxygen. According to this method, granular iron oxide containing elemental sulfur is discharged from the moving bed desulfurizer, so by removing elemental sulfur and regenerating the granular iron oxide, it can be transferred to the desulfurizer. +4 can be used in circulation.

However, the granular iron oxide used in the gas-lark sneak method does not necessarily have sufficient wear resistance. Incidentally, the above-mentioned granular iron oxide is molded into granules using cement as a binder, and when it is used repeatedly, about 100 ml of VC is consumed every 1 cycle.

Therefore, the present invention is applicable not only to the de-faith process but also to the regeneration process.
This project proposes a method for producing a high-strength iron oxide molded body suitable for use as a desulfurization agent in the dry desulfurization process that does not contain hydrogen sulfide, in which a bed is used. Mix the clay and mix this mixture in the presence of suitable water! rear,
The bar is molded into the desired shape and dimensions, dried, and then fired at a neutral temperature of 300 to 600° C. in an oxygen atmosphere.

In the present invention, any iron oxide powder conventionally used as a desulfurizing agent for hydrogen sulfide-containing gas can be used as the iron oxide powder. The clay mixed with the iron oxide powder functions as a binder, and the mixing ratio of this clay is iron oxide powder 11 J O weight: 1 part - t > 25 ~ l 0
It is preferable to set it in the range of 0x, 1itstyJ. This is because if the mixing ratio of clay is too small, it will not be possible to impart sufficient strength to the molded body after firing, and if it is too large, the performance as a desulfurizing agent will deteriorate. However, the clay used in the present invention must be able to provide sufficient strength to the molded body after firing at the above-mentioned mixing ratio. Examples include clay. If it is not fired, there is a risk of collapse due to mist in the gas to be treated.

The mixture of iron oxide powder and clay is kneaded in the presence of an appropriate amount of water, then molded into the desired shape and dimensions, dried, and then dried for 30 minutes.
It is fired at a temperature of 0 to 600°C. The shape and dimensions of the molded body can be chosen arbitrarily, but the firing temperature is 300 to 60
0°ICc) range. If the temperature is below 300℃, the fired product cannot be expected to have sufficient strength;
This is because iron oxide will be sintered at a firing temperature of 0° C. or higher.

Next, the configuration and effects of the present invention will be specifically explained using examples.

Example: 65 parts by weight of iron oxide powder was mixed with 35 parts by weight of clay, and after kneading in the presence of an excess of water, the resulting mixture was approximately 6.2 parts in diameter and 1511 parts in length.
It was molded into a cylindrical shape, and then dried at io0°C. Next is this dry cultivation! The ψ body was fired at various temperatures, and the relationship between the unit crushing strength and micro strength of the fired molded body and the firing temperature was determined.

The unit crushing strength was determined using a Honya type strength meter. In addition, the micro strength is 5.0g of sample for 25AX300
Insert 10 steel balls of 8 fin diameter, seal both ends of the tube, and insert the copper tube into two tubes so that the sample inside the tube and the steel balls reciprocate at both ends of the tube.
The test sample was rotated for 20 minutes at Orpm, and then passed through a 9-mesh sieve, and was defined by the percentage of sample remaining on the sieve.

The results are shown in the attached drawings, and it is clear from the results that according to the method of the present invention, an iron oxide desulfurization agent with ten-proof strength can be obtained.

[Brief explanation of drawings]

The drawing is a graph showing the relationship between unit crushing strength and micro strength of an iron oxide desulfurizing agent and firing temperature.

Claims (1)

[Claims] 1. Mix #1 iron chloride powder with clay, mix this mixture in the presence of water, mold it into the desired shape and size, dry it, and then heat it at a temperature of 300 to 600°C. A method for producing a high-strength iron oxide desulfurization agent, which comprises firing in an atmosphere of degaric acid.