JPS6051654A - Iron removal purification for ceramic raw material - 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 provides ceramics useful because they contain a slight amount of impure iron,
Chlorine or small amounts of easily decomposed chlorides, such as ammonium chloride and aluminum chloride, are used as raw materials for ceramics, such as refractories.

Add titanium chloride, tin chloride, zinc chloride, etc., heat to a temperature of 600°C or higher (preferably 700°C or higher) for a certain period of time, remove after-product volatiles, and obtain refined ceramic raw materials from the residue. 1. When heating, the amount of iron necessary to convert it to FeC12 (equivalent is better)
of chlorine or chloride, then add carbonaceous material equivalent to the iron content, and heat the iron content at a certain temperature for a certain period of time to sufficiently convert the iron content into FeCl2.Then, the after-produced volatiles are expelled and the residue is used for refining ceramics. This relates to a deiron refining method for obtaining raw materials, which allows deironization to be carried out economically and easily by minimizing the consumption of chlorine and chlorides, and because the deironation temperature is relatively low. It has the advantage of not causing significant changes in the plasticity of ceramic raw materials.

Fezes reacts with chlorine at relatively low temperatures, e.g. 500-600<0>C, or with chlorides to form FeC13. FeC13+ has a boiling point of 317° C. and evaporates immediately at much lower temperatures, whereas sintered FeO only reacts with chlorine or chloride at higher temperatures. In order to cause this reaction, it is necessary to keep FeC13 at a temperature above a certain level for a considerable period of time so that all the iron becomes FeCl2. If kept at sufficient temperature and time, the generated FeC
FeO reacts with J a to become FeC1z. That is, FeO+ 2FeC113+ C→3FeClz +
Becomes CO.

For this reason, in the present invention, the preparation is kept at a certain temperature or higher for a certain period of time, and the container is lined with an acid-resistant material and is hardened so that it can be slightly pressurized.

Furthermore, considering the chemical reaction of each additive, in the case of chlorine, FeC13+ 2C12+ 30-+ 2FeC12+
3CO(1)FeO+ CA'2 + C-+ Fe
Cl2+ CO(2)F'eO+ 2FeCJ3+ C
→3FeCA'2+ CO(3) additive is AICA'3
In the case of , Fe20a + 2AICA! 3-+2FeCA! 3
+Al2O3(4)FeC13+ FeO+ C-+
2FeCAh + CO(5)FeO+Fe2O3+2
AIC13+ C-+ 3FeCA! 2+A1z03+
CO(6) (4) - (6) The reaction takes place as appropriate, and the final product is FeCl2.

When the additive is NH4C12, FeO+ 2NH4CA'-+FeC1z + 2NH
3+H2OFe20s+4NH<CI+C→2FeC1
2+4NHs+2HzO+CO In this case, in order to react sufficiently to form FeCl2, it is necessary to add a small amount of carbonaceous material and maintain a slightly pressurized state.

Further explanation will be given below with reference to examples.

Example 1 Amakusa pottery stone 10011 was ground, 0.9 g of chlorine 1.36.9 carbonaceous material was added, and after heating at 800° C. for 1 hour, reaction volatiles were expelled to obtain 94 g of refined ceramic raw material as a residue. The chemical composition of raw materials and products before and after iron removal is as follows. In addition,
The iron removal rate at this time was about 95%.

Item 1g, 1oSs 5iOz Al2O3Fe2Q
3 Before iron removal 3.82 75.67 14.32 3.8
6 After iron removal 1.23 81.50 15.50 0.1
2 Example 2 0.911 aluminum chloride was added to 100 I of the mackerel soil and frog's eye clay preparation, a small amount of carbonaceous material was added, the mixture was placed in the treatment container, and the volatile products were removed after being treated at 800°C for 1 hour. Purified products98. I got P. The chemical components before and after purification are shown in the table below. The iron removal rate at this time reached approximately 95%.

((6) (A) (A) (A) Before purification 5.93 66.67 24.12 1.05
After purification 1.20 69.30 25.20 0.10
Example 3 2.51 for Kitashibun Morito Shale 100I! of chlorine and 1.511 of a carbonaceous material were added, and the mixture was treated at 800°C for 1 hour to drive out the after-produced volatiles and the residue was purified into a refined shale of 85.9%.
I got it. The chemical composition before and after iron removal is as shown in the table below, and the four degrees of refined shale are S.

K, it was 40.

(Work (I) (@(Work 15.0 20.2 60.1 3.52.30 24
゜0 72.0 1.0 Example 4 3 aluminum chloride for 100 g of Shandong shale
．． 6! ! and 1g of carbonaceous material, 800
℃ for 1 hour to drive out the volatiles, and the residue was purified Dono Shale 83F. The chemical components before and after iron removal are as follows. In addition, the iron removal rate is approximately 85q6, which is approximately 1% of the refined raw material.
The fire level was S, 40.

Example 5 2E of chlorine for 100g of fly ash.

(No carbonaceous material was added because unburned carbon was used.) The mixture was placed in a deironization container and treated at 800°C for 1 hour to obtain 9'l of purified fly ash. Fly ash is a fine powder, a hollow material that has undergone heat treatment, and if refined, it is a suitable raw material for ceramic raw materials, electronic materials, and other uses. Examples of chemical components before and after purification are as follows. The iron removal rate reached approximately 95 cm.

Fly ash components before and after refining After refining 1.0056.7 282 02 - - According to the method of the present invention, the consumption of chlorine and chloride from the ceramic raw material, which cannot be used as a useful raw material because it contains a slight amount of impure iron, is greatly reduced. It is possible to refine a useful ceramic raw material by removing iron in a small amount and economically.Moreover, since the iron removal temperature in this case is relatively low, the plasticity of the obtained ceramic raw material is remarkable. It has the advantage of not changing.

Patent applicant Suzuki Kan

Claims (1)

[Claims] ■ Low-grade ceramic raw materials such as pottery stone, clay, silica sand, bamboo shale coal, and pulverized coal ash, which cannot be used as a useful ceramic raw material because they contain a small amount of impure iron, contain a small amount of carbonaceous matter and a small amount of carbonaceous material. Add chlorine or easily decomposable chlorides such as ammonium chloride, aluminum chloride, titanium chloride, tin chloride, zinc chloride, etc., maintain heating at a temperature of 600°C or higher for a certain period of time, sufficiently convert the iron content into FeCl2, and then This ceramic industry aims to obtain a refined raw material from the residue by expelling the produced volatiles, and is characterized by waiting until almost all of the impure iron becomes FeC12, and then refining by expelling the produced volatiles. Raw material deiron refining method.