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A method of extracting aluminum from aluminum-containing waste
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A technology of aluminum waste and materials, applied in the direction of alumina/hydroxide, etc., can solve the problems of high energy consumption and low recovery rate, and achieve the effects of low energy consumption, short process and low one-time investment
Active Publication Date: 2017-02-01
JINCHUAN GROUP LIMITED
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[0005] The purpose of the present invention is to provide a method for extracting aluminum from aluminum-containing waste materials, especially for aluminum-containing waste materials such as non-ferrous smelting slag and waste catalyst, so as to solve the problem of recycling when using traditional waste aluminum raw materials to extract aluminum. The shortcomings of low efficiency and high energy consumption, and the reuse of aluminum-containing waste such as non-ferrous smelting slag and spent catalyst
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example 1
[0045] A method for extracting aluminum from aluminum-containing waste, comprising the steps of:
[0046] Step 1. Weigh 50 g of aluminum-containing waste, 20.95 g of activated carbon, and 10.48 g of sodium chloride, and grind the above materials until the particle size is 80 mesh, and then mix them evenly;
[0047] Step 2. Put the homogeneously mixed material in step 1 into a quartz boat and place it in a tube furnace. When the temperature rises to 500°C, put the material in a chlorine gas stream, and chlorinate it for 4 hours. At the same time, use 2mol / L Dilute hydrochloric acid absorbs volatile matter to obtain 2L of absorption liquid;
[0048] Step 3. Heat and concentrate the absorption solution prepared in Step 2. After the volume is reduced to 500ml, add deionized water to the original volume and continue to concentrate. After repeated concentration for 3 times, the resulting concentrated solution was 500ml and the acidity was 0.5mol / L. Filter the concentrated solution...
example 2
[0055] A method for extracting aluminum from aluminum-containing waste, comprising the steps of:
[0056] Step 1. Weigh 100g of aluminum-containing waste, 62.85g of activated carbon, and 41.9g of potassium chloride, and grind the above materials until the particle size is 100 mesh, and then mix them evenly;
[0057] Step 2. Put the homogeneously mixed material in step 1 into a quartz boat and place it in a tube furnace. When the temperature rises to 600°C, put the material in a chlorine flow, and chlorinate it for 4 hours. At the same time, absorb it with dilute hydrochloric acid. Volatile matter, get absorption liquid 3L;
[0058] Step 3. Heat and concentrate the absorption solution prepared in Step 2. After the volume is reduced to 1 L, add deionized water to the original volume and continue to concentrate. After repeated concentration for 5 times, the resulting concentrated solution was 1 L with an acidity of 0.3 mol / L. Filter the concentrated solution and collect the fil...
example 3
[0065] A method for extracting aluminum from aluminum-containing waste materials is implemented according to the steps in Example 2 without adding alkali metal chlorides. The experimental result data of this embodiment are shown in Table 4.
[0066] Table 4
[0067]
[0068] Compared with Example 2, without adding alkali metal chloride, the concentration of chloride ions decreases during the chlorination process, resulting in a decrease in chlorination efficiency and a significant reduction in the extraction rate of aluminum.
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Abstract
The invention discloses a method for extracting aluminum from aluminum waste. The method comprises the following steps: firstly, respectively crushing the aluminum waste, active carbon and alkaline metal chloride, and uniformly mixing the crushed aluminum waste, active carbon and alkaline metal chloride in proportion; placing the prepared mixture in chlorine flow under a high temperature, and absorbing volatile matters by utilizing diluted hydrochloric acid; repeatedly heating and concentrating absorption liquid, evaporating and filtering; adding a sodium hydroxide solution into filtrate at a heat state, adjusting the pH value to 12 to 14, carrying out the reaction for 1 to 2 hours at the heat state, and then filtering to obtain filtrate rich in sodium aluminate; and finally extracting the aluminum or aluminum oxide product from the filtrate rich in sodium aluminate. According to the method, metal such as aluminum in aluminum-containing waste is converted to chloride in a chloridizing manner to be volatized and absorbed by utilizing an absorption solution. Silicon is primarily removed by virtue of heating and filtering, then the pH value of the filtrate is adjusted, the aluminum is hydrolyzed into soluble salt, other foreign metal is hydrolyzed into precipitates, the gathering of the aluminum is completed, and the aluminum and aluminum compounds are further extracted from the solution rich in aluminum.
Description
technical field [0001] The invention relates to the technical field of nonferrous metallurgy, in particular to a method for extracting aluminum from aluminum-containing waste with high recovery rate, low energy consumption and simple process. [0002] technical background [0003] Aluminum is an important light metal. In nature, it mostly exists in minerals such as gibbsite, boehmite, and diaspore in the form of alumina. As an important component of non-ferrous metal minerals, alumina is also widely present in non-ferrous metal minerals such as nickel, copper, and cobalt. In the slagging process of modern non-ferrous metallurgical industry, alumina is usually removed by slagging reaction with input slagging agent during smelting and blowing process, forming a large amount of non-ferrous metallurgical slag containing aluminum, which becomes a potential aluminum resource. In addition, due to its strong adsorption and catalytic activity, alumina is often used as a carrier of ca...
Claims
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