JPH02502373A - Method for reducing iron silicate melts to produce refractory and chemical resistant fibers with bottom metals - 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] Iron silicate melts for producing fire- and chemical-resistant fibers with bottom metals The present invention provides a method for reducing bottom metal fibers that are resistant to high temperatures and harsh chemical conditions. The present invention relates to a method of utilizing ferrous silicate slag to produce it.

Metallurgical slags are not suitable for fiberization per se, those slags are used in the production of fibers. Known methods of utilizing slag are based on mixing slag with additives.

These admixtures are used to change the physical properties of the slab melt to make it suitable for fiberization. It is used for Industrial production almost exclusively uses blast furnace slag; is melted in a cupola furnace and disintegrated into fibers in a four-wheeled centrifugal separator. most common The final product produced is an insulating material.

Uses other than blast furnace slag are extremely rare. For example, in the manufacturing process of copper and nickel. Iron silicate slag is produced as a by-product, and these slags can bring more benefits. Iron silicate slag, which is not used in textile manufacturing despite being Its unique chemical composition makes it resistant to extreme temperatures and harsh chemical conditions, for example. It is possible to produce fibers that These possibilities were not exploited mainly because Due to the limitations of the melting equipment, i.e. the cupola furnace of fiber production. Cupola furnace melting When coke is used in This hinders the disintegration process. Furthermore, raw materials have grain size controls. There are limits. The raw material fed to the cupola furnace must be of large size, This allows gases generated during melting to be exhausted from the furnace through the raw material bed. Can be done.

For the past year, electric furnace melting has been considered to be used in textile manufacturing, but the situation has changed and new New raw materials are now available. For example, the use of electric furnaces is covered by Finnish patent no. It is known from No. 72502.

Ii! #i The use of iron silicate slag in the production is covered by Finnish patent application 98451 No. 14. This application discloses a slag melt to obtain a fiber-disintegrable slag melt. Two methods of mixing rugs are introduced. Generally speaking, the purpose of mixing is to The purpose is to change the properties of the slag by adding different slag components. this As a result, the slag melt is well a! Difficult to disintegrate, the final product reaches the required quality Ru.

The invention is based on a unique point of view.The idea of the invention is to remove iron oxide from slag. By changing the chemical composition of iron silicate slag to make it suitable for S binding holes. It is in. Iron usually exists mainly in divalent form in slag, with oxygen present in the form of FeO. is combined with In slag, iron oxide FeO has an alkaline composition, which is Acidic slag components prevent the formation of a continuous network structure. The existence of a network structure , is necessary for m-fiber disintegration of the slag melt. By removing iron oxide from slag Therefore, the slag component is changed to become more acidic. This ensures that the slug contains The physical properties of the slag are suitable for the m1ss solution. The essentially novel features of the invention as varied as above are set forth in the appended claims. It is made clear.

Removal of iron oxide is carried out by using the reducing tendency of iron oxide, which is already It is already known from cupola furnace melting. The iron oxide component of slag is, for example, It is reduced by oxidizing iron from slag using granulated coke or coal powder. Ru. The metal obtained as a reduction product is also separated from the slag to form the bottom metal. It stays at the bottom of the melting furnace in order to Copper, nickel, cobalt, etc. contained in slag of precious metals are also aggregated into the bottom metal. The Fe component of slag is the gold produced. It is controlled by the amount of reducing agent fed to the furnace as well as the amount of metal. Their reduction reaction As a result, exhaust gas containing CD and CDz is also produced.

The reduction of the iron silicate slag according to the invention is carried out in a suitable furnace apparatus, for example an electric furnace. The iron silicate slag is fed into the furnace in solid or molten state. Reducing agent, and For example, fine-grained coke is injected through an electrode or lance and fed into the molten slag. It will be done. This is also mixed in the molten slag. This mixing is necessary for the reduction reaction. be. This mixture too. Necessary to increase the separation of metals produced from slag It is. As a result of the reduction reaction, the melting point of the slag increases and it is discharged from the furnace at an elevated temperature. It will be done. The tapping of the slag for fiber refining is arranged to be rapid. regarding metal The melt is removed from the furnace in an unharmed manner through specially arranged tapping holes.

In the method of the invention, iron oxide is reduced from iron silicate slag and the resulting slag is The alkalinity is suitable for difficult fibers, (FeO*CaO+NgO)/(Si02 The molar percentage of +A1203) is set to o, so-o, and s. After seven is one The commonly known fiber refractory method makes the slag melt resistant to high temperatures and harsh chemical conditions. It is processed into fiber that can be used.

While reducing silica II iron slag according to the present invention, the components of the metal produced are slag depends essentially on the amount of reducible metal oxide contained in the Bottom metal Fe composition The proportion is generally over 80%, with the remaining metals being copper, nickel and cobalt. It is a precious metal.

If for several desired reasons: 1. the reduction of iron silicate slag according to the present invention; At the initial stage, for example, the addition of admixtures that has a definite effect on the properties of the final product. It is also possible to add

Some of the advantages of the method of the present invention using iron silicate slag will be described below.

(!) Iron silicate Steg has two valuable end products, namely !ll!l and metal Na Ru.

(2) The slag itself, apart from the reducing agent, is enough for the required raw material for $100. It is.

(3) The iron silicate slag is supplied to the reduction furnace in a molten state, and the slag contains Thermal energy generated by Ru.

The method of the present invention utilizing iron silicate slag is further illustrated by the following example.

mosquito Iron silicate slag is obtained as a by-product of the nickel manufacturing process. Its typical chemical composition is , Fe41.5$, S+02211.5$, CaO1,5S, Ng O8,5! Oyohi A1rOs 4. Hf0 iron contained in slag according to the present invention When the 751 is reduced, a fibrotic slag is obtained to the next component.

Susu b Chi Fe 17. Et$, 5iO251, (HCaO2J$, )Igo ll, 1$ Oyobi Al2O37,51c' Al, t he"CI) Par-t r7) is the weight percentage. The molar alkalinity of the slag is O0εa. Quartz For every ton of consumption of iron acid, fiber! The production volume of disintegrable slag mixture is approximately 590kg, and the estimated metal production amount is 325kg.

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Claims (5)

[Claims] 1. Iron silicate steel with high iron content for the production of fire- and chemical-resistant textile materials In terms of how to use rugs, The iron oxide content of the iron silicate slag is reduced by ring-forming the slag. As a result, the molar alkalinity of the slag melt (FeO+CaO+MgO)/(S iO2+Al2O3) was adjusted within the range of 0.5-8, in which case the obtained The product consists of fiber disintegrable slag melt and iron plus at least copper, nickel and The method is characterized in that the molten metal contains noble metals such as cobalt and cobalt. 2. For the method of claim 1, the amount of metal produced as well as the slag The FeO content of the melt is also adjusted by A) the amount of reducing agent fed to the furnace. How to characterize it. 3. A method according to claims 1 and 2, wherein the reducing agent used is a powder coat. A method characterized by being a couscous. 4. A method according to claims 1 and 2, in which the reducing agent used is coke datum. A method characterized by being a strike. 5. The method according to claim 1, characterized in that the reduction is carried out in an electric furnace. How to make it a sign.