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Method for separating tin from tin-lead-stibium-arsenic alloy by vacuum distillation

A technology of distillation separation and antimony alloy, which is applied in the direction of improving process efficiency, etc., can solve the problems of poor antimony volatilization effect, difficult treatment, and restriction of antimony volatilization, and achieve simple equipment, high universality of raw materials, and no discharge of three wastes Effect

Inactive Publication Date: 2015-05-27
KUNMING DIBOO TECH
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Problems solved by technology

The treatment of this material is very difficult. The previous wet treatment is to separate the tin, lead, antimony and arsenic before the dust reduction. Since the raw material contains arsenic, it may produce arsine hydrogen highly toxic gas during the wet treatment. This method It has the disadvantages of long treatment process, large amount of wastewater, complicated process and high cost
Pyrochemical treatment is to remove antimony from tin-lead-antimony-arsenic alloy by oxidation method, but when the alloy tin is greater than 2wt.%, tin will form high-valent oxides and cover the surface of the melt, which is difficult to volatilize, so the existence of tin will seriously restrict the volatilization of antimony The higher the tin, the worse the volatilization effect of antimony. Therefore, it is necessary to find a high-efficiency, low energy consumption, and environmentally friendly method to separate tin from tin-lead-antimony-arsenic alloys in order to better separate lead and antimony.

Method used

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  • Method for separating tin from tin-lead-stibium-arsenic alloy by vacuum distillation

Examples

Experimental program
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Effect test

Embodiment 1

[0015] Such as figure 1 Shown, the method for separating tin by vacuum distillation of the tin-lead-antimony-arsenic alloy, its specific steps are as follows:

[0016] Step 1. First, 82t of tin-lead-antimony-arsenic alloy whose composition is Sn68.58wt.%, Sb27.3wt.%, Pb3.2wt.%, As0.6wt.% is melted at a temperature of 420~520°C;

[0017] Step 2. The tin-lead-antimony-arsenic alloy liquid obtained in step 1 is continuously and stably fed into the vacuum furnace at a rate of 7 tons per day by using the constant-current feeding method. The vacuum degree of the vacuum furnace is controlled to 5Pa, and the distillation temperature is 1450-1500°C for vacuum distillation , to obtain 55.16 tons of crude tin products containing Sn98.7wt.%, Sb0.65wt.%, Pb0.09wt.%, As0.04wt.% in the residual substance and the tin-lead-antimony-arsenic alloy metal vapor entering the condenser, and the condenser It is divided into 3 sections to condense the metal vapor of the tin-lead-antimony-arsenic allo...

Embodiment 2

[0020] Such as figure 1 Shown, the method for separating tin by vacuum distillation of the tin-lead-antimony-arsenic alloy, its specific steps are as follows:

[0021] Step 1. First, 49.46 tons of tin-lead-antimony alloy whose composition is Sn25.9wt.%, Sb47.5wt.%, Pb23.4wt.%, As3.0wt.% are melted at a temperature of 560~650°C;

[0022] Step 2. Send the tin-lead-antimony-arsenic alloy liquid obtained in step 1 continuously and stably into the vacuum furnace at a rate of 12 tons per day by using the constant-current feeding method. Control the vacuum degree of the vacuum furnace to 10 Pa, and carry out vacuum distillation at a distillation temperature of 1000-1150 °C , obtain the residue containing Sn78.5wt.%, Sb19.6wt.%, Pb1.03wt.%, As0.3wt.% tin-lead-antimony alloy 17.41 tons and enter the tin-lead-antimony-arsenic metal vapor in the condenser, the condenser It is divided into two stages to condense the metal vapor of the tin-lead-antimony-arsenic alloy, and the temperature ...

Embodiment 3

[0027] Such as figure 1 Shown, the method for separating tin by vacuum distillation of the tin-lead-antimony-arsenic alloy, its specific steps are as follows:

[0028] Step 1. First, melt 56.4t of tin-lead-antimony-arsenic alloy whose composition is Sn2.92wt.%, Sb5.88wt.%, Pb90.68wt.%, As0.32wt.% at a temperature of 300~350°C;

[0029] Step 2. Send the tin-lead-antimony-arsenic alloy liquid obtained in step 1 continuously and stably into the vacuum furnace at a rate of 14 tons per day by using the constant-current feeding method. The vacuum degree of the vacuum furnace is controlled to 2Pa, and the distillation temperature is 1150-1200°C for vacuum distillation , the residue containing Sn67.64wt.%, Sb21.71wt.%, Pb9.91wt.%, As0.07wt.% tin-lead-antimony alloy 2.32 tons and the tin-lead-antimony-arsenic alloy metal vapor entering the condenser will be condensed The condenser is divided into two sections to condense the metal vapor of the tin-lead-antimony-arsenic alloy. The temp...

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Abstract

The invention relates to a method for separating tin from tin-lead-stibium-arsenic alloy by vacuum distillation, belonging to the technical field of vacuum metallurgy of non-ferrous metals. The method comprises the following steps: melting the tin-lead-stibium-arsenic alloy to obtain tin-lead-stibium-arsenic alloy liquid at first; and continuously and uniformly feeding the obtained tin-lead-stibium-arsenic alloy liquid into a continuous vacuum furnace by adopting a constant-current feeding method to carry out vacuum distillation so as to obtain residues, namely crude tin or tin-lead-stibium alloy and tin-lead-stibium-arsenic metal vapor entering a condenser, and controlling the temperature of the condenser and the condensation section number according to the concentration of tin vapor in the tin-lead-stibium-arsenic metal vapor, thereby obtaining tin-lead-stibium alloy, lead-stibium alloy and crude arsenic. According to the method, a tin-lead-stibium-arsenic alloy raw material is directly separated by adopting the continuous vacuum furnace; the universality to raw materials is higher; the lead-stibium alloy with the tin content less than 0.2wt%, the crude tin with the tin content above 98wt% and crude arsenic with the arsenic content above 90wt% can be obtained; and therefore, high-efficiency separation of the tin-lead-stibium-arsenic alloy is realized.

Description

technical field [0001] The invention relates to a method for separating tin by vacuum distillation of a tin-lead-antimony-arsenic alloy, which belongs to the technical field of vacuum metallurgy of nonferrous metals. Background technique [0002] During the smelting process of lead, tin, antimony and copper and the recycling process of waste secondary resources, a large amount of tin-lead-antimony-arsenic alloy fumes, anode slime, and alkali slag produced by pyro-tin removal in the lead-bismuth smelting process will be produced. Sn-Pb-Sb-As alloys can be obtained by reduction smelting. Due to different sources of raw materials, the content of each element in the alloy varies widely. Among them, the range of tin is from 2wt.% to 75wt.%, and the range of antimony is from 5wt.% to 50wt. .%, arsenic is generally 0.3wt.% to 8wt.%, and the balance is lead. The treatment of this material is very difficult. The previous wet treatment is to separate the tin, lead, antimony and arsen...

Claims

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Application Information

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IPC IPC(8): C22B9/02C22B9/04C22B25/00
CPCY02P10/20
Inventor 速斌邵丹马祥亚李燃樊则飞陈浩苏鑫海吕进罗自平黎文霖李敏张天秀戴卫平
Owner KUNMING DIBOO TECH
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