TW200408615A - Method for recycling aluminum slag - Google Patents

Abstract

A method for recycling aluminum slag is mainly used to sieve and recycle aluminum from sintered aluminum slag, and the remaining aluminum slag waste material after removing metal aluminum is calcined to form a refractory material in order to recycle aluminum slag and increase the economic value of the aluminum slag. The invented method comprises using a high temperature furnace to calcine aluminum slag into a material mainly consisting of alumina (with a crystal phase of corundum) to be used as a refractory material. The invented method not only can solve the problem of treating waste aluminum slag, but also can reduce the amount of energy used in producing a refractory material while avoiding waste of resources.

Description

200408615 V. Description of the invention (0 [Inventive subject matter] The present invention is a method for reusing aluminum slag ash, mainly by sintering the remaining slag ash waste after the smelting furnace slag is sorted to recover the metal slag. The raw materials of the paired fire materials are 'for the purpose of achieving Shao> ash depletion, and create higher economic value. [Background of the invention] Aluminum is a highly active metal, so it is easy to have aluminum in the aluminum smelting process of secondary aluminum plants. The generation of oxidized scum; this slag is called smelting slag, referred to as aluminum slag after cooling and cooling. During the process of aluminum slag removal and aluminum slag, some metal aluminum will be mixed; The residual metal aluminum is sorted and recovered, and the remaining materials are sorted and discarded. This discarded material is called aluminum slag ash. The chemical composition of aluminum slag ash is mainly alumina, silica, and sodium oxide. , Iron oxide, magnesium oxide and calcium oxide, the proportion of each component varies slightly with different manufacturers' raw materials and operating conditions. The chemical composition of a typical aluminum slag ash is shown in the fourth figure. And aluminum slag ash the size of granule With the different screening conditions of various manufacturers, it is usually less than 20 mesh. The inventor has engaged in research and implementation in the field of aluminum slag ash resource utilization for many years, and has accumulated rich practical experience. During the Republic of China in 1989, People use phosphoric acid or sulfuric acid to stabilize the aluminum slag ash, add sand and cement, and then apply pressure to make the cement body. This method provides an effective solution for the aluminum slag ash resource utilization. The invention No. 1 4 3 7 1 1 of the Republic of China, the inventor, after further research in recent years, has the invention of this invention.

Page 4 200408615 V. Description of the invention (2) [Objective of the invention] The present invention is based on the characteristics of high slag and aluminum content of aluminum slag, which is close to the chemical composition of the raw material of the refractory material, so it is used to make it into a refractory material. raw material. This method can not only fully recycle aluminum slag ash and solve the problem of aluminum slag ash treatment, but also increase the added value of aluminum slag ash and effectively reduce the waste of resources and energy for manufacturing refractory raw materials. [Main description of the invention] Aluminum is the most abundant metal element in the earth's crust. It is extremely lively and does not exist as a metal in nature. Until the emergence of aluminum metal refining technology in the 19th century, the application of aluminum metal gradually began. , And so far it has become the second most used metal, and it continues to increase. Because of its chemical nature, aluminum cannot be oxidized during chain smelting at high temperature. In addition, the raw materials contain moisture and organic matter, which is one of the reasons for the oxidation of metals. This oxide has a small specific gravity, and then floats on the surface of the liquid, forming a floating fishery. After removing and cooling the scum, it becomes an aluminum slag. Therefore, with the exception of the metallic aluminum contained in the aluminum slag, most of its oxides are oxidized. The main component of the incineration ash remaining after the ingot separation and recovery of metal inscriptions will also be alumina. The present invention aims at the characteristics of high aluminum content of aluminum slag ash, and utilizes it as a resource. It proposes an economical and effective method to treat aluminum slag ash that should be treated as waste to make high-price refractory materials. Please refer to the first figure. The main steps of the present invention are: 1. Use aluminum slag as raw material;

200408615 V. Description of the invention (3) 2. High temperature sintering and stabilization; 3. Raw materials for making refractory materials. That is, the main method of the present invention is to use a high-temperature kiln to sinter the aluminum slag ash at a high temperature to transform it into a material whose main component is alumina (mineral crystal phase is corundum) for use as a raw material for refractory materials. During firing, the A1N (aluminum nitride) and A14C3 (aluminum carbide) that affect the recycling of resources will tend to stabilize. The aforementioned high-temperature sintering has a temperature range from 800 ° C to 180 ° t. The above-mentioned aluminum slag ash refers to the residue after the aluminum slag is sorted to recover metal aluminum or the aluminum slag is pulverized to make the particles finer. According to the above method, the aluminum slag ash material calcined to 800 ° C can be seen from the results of X-ray diffraction analysis (XRD). XRD results of fish ash at 1 3 0 0 ° C. The X-axis and Y-axis in the figure indicate the angle and intensity of X-ray irradiation. The crystal phase of the above-mentioned steel and jade is more obvious as the temperature of the fire is higher (the third figure is Aluminium slag ash calcination XRD result stacking chart from 80 0 ° C to 15 0 ° C), so the temperature of aluminum slag ash calcination is controlled, and the raw materials produced can meet the needs of different grades of refractory applications, The so-called refractory materials include shaped and unshaped refractory materials such as fire bricks, fire muds, washing materials, etc .; the so-called refractory raw materials refer to the additives in the manufacturing process of refractory materials. During the sintering process, A 1 N (aluminum nitride) and A 14 C3 (aluminum carbide), which affect its resource reuse, will tend to be stable. The reaction formula is as follows: 4A1N + 7〇2 ~ > 2Α12〇3 + 4N02 AI4C3 + 6〇2_ > 2Al2〇3 + 3C〇2

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Claims (1)

200408615 VI. Scope of patent application 1. A method for recycling aluminum slag ash, mainly by sintering the remaining aluminum slag ash from aluminum smelting in a high temperature kiln to make A 1 N (aluminum nitride in aluminum slag ash) ) And A 14C3 (aluminum carbide), and by controlling the temperature of sintering, the raw materials required to manufacture different grades of refractory materials. 2. The method of recycling aluminum slag ash as described in item 1 of the scope of patent application, wherein the aluminum slag ash refers to the residue after the aluminum slag is sorted and recovered or the aluminum slag is crushed and ground. Process to make the particles finer. 3. The method of recycling aluminum slag ash as described in item 1 of the scope of patent application, wherein the temperature of the sintering ranges from 800 ° C to 180 ° C. 4. The method for reusing slag ash as described in item 1 of the scope of patent application, in which the so-called refractory materials include: shaped and unshaped refractories such as refractory bricks, refractory mud, and castables. 5. The method of recycling aluminum slag ash as described in item 1 of the scope of the patent application, wherein the raw materials of the refractory materials refer to the additives in the manufacturing process of refractory materials. 6. The method for reusing aluminum slag ash as described in item 1 of the scope of the patent application, where the so-called stabilization is to change its A 1 N (aluminum nitride) and A 14C3 (aluminum carbide) by using high-temperature sintering. Of characteristics.