Method for comprehensive recovery of lead and tin from alkaline refining slag of lead

A refining slag and alkaline technology, applied in the field of tin and lead comprehensive recovery, can solve the problems of waste of resources, difficult to recycle, increase the difficulty of tin removal, etc., and achieve the effect of reducing the difficulty and improving the purity.

Active Publication Date: 2010-07-07
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, the tin contained in the lead alkaline refining slag has become an impurity, part of which is transferred to the smoke dust during the lead smelting process and is difficult to recycle, and the other part enters the crude lead and continues to be recycled in the lead smelting system
Therefore, the tin in the above-mentioned lead alkaline refining slag has not been effectively recovered, resulting in waste of resources
On the other hand, in the lead smelting production process, tin exists in the form of impurities and becomes a substance that needs to be removed. difficulty, causing unnecessary increase in the production process and cost of lead production
Therefore, how to comprehensively recover valuable metals such as lead and tin from the above-mentioned lead alkaline refining slag raw materials, so as to open the way for tin from the lead smelting process system is a difficult problem to be further explored

Method used

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  • Method for comprehensive recovery of lead and tin from alkaline refining slag of lead

Examples

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Embodiment 1

[0024] Adopt the present invention to composition be following weight percentage Pb81.06, the lead alkaline refining slag of Sn6.79 carries out comprehensive recovery lead, tin, carries out by following steps successively:

[0025] Step 1: oxidative roasting step, the lead alkaline refining slag is oxidatively roasted according to the conventional method, the oxidation roasting temperature of the lead alkaline refining slag is 300-500° C., and the roasting time is 2-6 hours to obtain the roasting slag;

[0026] Step 2: the leaching step, leaching the roasted slag obtained in step 1 with nitric acid, first leaching with 25% nitric acid solution for 2 hours; then replenishing water to dilute the leaching solution and then leaching for 2 hours, the liquid-solid weight ratio after dilution is 6:1 , the temperature is 40-80°C, and then filtered and separated to obtain lead nitrate solution and tin slag; the leaching solution is used for the synthesis of the next process, the tin sla...

Embodiment 2

[0031] Adopt the present invention to composition be following weight percentage Pb81.06, the lead alkaline refining slag of Sn6.79 carries out comprehensive recovery lead, tin, carries out by following steps successively:

[0032] Step 1: oxidative roasting step, the lead alkaline refining slag is oxidatively roasted according to the conventional method, the oxidation roasting temperature of the lead alkaline refining slag is 300-500° C., and the roasting time is 2-6 hours to obtain the roasting slag;

[0033] Step 2: namely the leaching step, leaching the calcined slag obtained in step 1 with nitric acid, first leaching with 30% nitric acid solution for 1.5h; then replenishing water to dilute the leaching solution and then leaching for 2h, the liquid-solid weight ratio after dilution is 7: 1. The temperature is 60°C, and then filtered to obtain the leaching slag, which is tin slag and leaching solution. The leaching solution is used for the synthesis of the next process. The ...

Embodiment 3

[0038] Adopt the present invention to composition be following weight percentage Pb81.06, the lead alkaline refining slag of Sn6.79 carries out comprehensive recovery lead, tin, carries out by following steps successively:

[0039] Step 1: oxidative roasting step, the lead alkaline refining slag is oxidatively roasted according to the conventional method, the oxidation roasting temperature of the lead alkaline refining slag is 300-500° C., and the roasting time is 2-6 hours to obtain the roasting slag;

[0040] Step 2: the leaching step, leaching the roasted slag obtained in step 1 with nitric acid, first leaching with 35% nitric acid solution for 1.5 hours; then replenishing water to dilute the leaching solution and then leaching for 1.5 hours, the liquid-solid weight ratio after dilution is 8 : 1, the temperature is 70°C, then filter to obtain the leaching slag, namely tin slag and leaching solution, the leaching solution is used for synthesis in the next stage of the process...

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Abstract

The invention relates to a method for comprehensive recovery of lead and tin from alkaline refining slag of lead, comprising the following steps: 1. oxidizing roasting: oxidizing roasting is carried out on the alkaline refining slag of lead for 2-6h at 300-500 DEG C;2. leaching: nitric acid leaching is carried out on roasted slag, the roasted slag is filtered and separated to obtain lead nitrate solution and zinc slag;3. synthesis: lead nitrate solution is precipitated by sodium hydroxide solution, pH value is controlled while the solution is continuously stirred, thus generating white lead hydroxide sediment which is filtered, washed and dried to obtain white lead hydroxide powder;4. calcination: the white lead hydroxide powder is calcinated to obtain yellow powder yellow lead, namely PbO powder. With the method, lead and tin in the alkaline refining slag of lead are effectively recovered and tin can be ploughed in the lead system; in addition, the method has the advantages of reliable technology and high comprehensive recovery rate.

Description

technical field [0001] The invention relates to a method for recycling metal smelting by-products, in particular to a method for comprehensively recovering lead and tin from metallic lead smelting by-products - alkaline refining slag. Background technique [0002] In the process of metal lead smelting, tin is generally removed by alkaline refining, and the lead alkaline refining slag produced in the process of lead alkaline refining and tin removal contains valuable metals such as tin and lead. This lead alkaline refining slag contains tin It can reach 6-7%, and the lead content is more than 80%, which has a high recovery value. In the prior art, the tin contained in the lead alkaline refining slag has become an impurity, part of which is transferred to the smoke dust during the lead smelting process and is difficult to recycle, and the other part enters the crude lead and continues to be recycled in the lead smelting system . Therefore, the tin in the above-mentioned lead...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B13/00C22B25/00C01G21/06
CPCY02P10/20
Inventor 林文军张婷刘一宁廖贻鹏
Owner ZHUZHOU SMELTER GRP
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