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Method for extracting metallic iron from zinc kiln slag

A technology for extracting metal and kiln slag, which is applied in the field of zinc kiln slag and metal iron extraction, can solve the problems of low utilization rate and waste of metal resources, achieve high recovery rate, increase reaction rate, and concise process

Active Publication Date: 2021-12-17
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to provide a method for extracting metallic iron from zinc kiln slag, to solve the problem of waste of a large amount of metal resources caused by the low utilization rate of zinc kiln slag in the traditional process, and to make full use of the valuable iron in the zinc kiln slag. Valuable metal iron, increase the added value of zinc kiln slag

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  • Method for extracting metallic iron from zinc kiln slag
  • Method for extracting metallic iron from zinc kiln slag
  • Method for extracting metallic iron from zinc kiln slag

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0040] Example 1 A method for determining component components in a molten salt system

[0041] The following six groups of melting salt systems are prepared separately. 1 -α 6 And the melting of the six groups of solids were measured separately, as shown in Figure 1:

[0042] alpha 1 : 1 mol (58.5 g) no water chloride;

[0043] alpha 2 : 0.2 mol (11.7 g) No aqueous sodium chloride and 0.8 mol (59.6 g) potassium chloride;

[0044] alpha 3 : 0.4 mol (23.4 g) No aqueous sodium chloride and 0.6 mol (44.7 g) no water supply;

[0045] alpha 4 : 0.6 mol (35.1 g) No water sodium chloride and 0.4 mol (29.8 g) no water-free potassium chloride;

[0046] alpha 5 : 0.8 mol (46.8 g) No aqueous sodium chloride and 0.2 mol (14.9 g) potassium chloride;

[0047] alpha 6 : 1 mol (74.5 g) no water supply;

[0048] Depend on figure 1 It can be seen that the molar ratio of sodium chloride and potassium chloride is 1: 0.4-2.5, the state of the molten salt system reaches an optimum value, and the temper...

Embodiment 2

[0049] Example 2 A method of extracting metal iron from a zinc kiln?

[0050] The reaction principle of this embodiment figure 2 .

[0051] This embodiment includes the following steps in turn:

[0052]a. Take zinc kiln slag (i.e., the leaching residue (zinc tailings) generated by the zinc mine (zinc tailings) is added to a quantity of coke, and the residue produced by metal recovery of zinc and lead is used in the rotary kiln. In the ball mill, the powder is made to a uniform particle size, and 10 kg is taken under the conditions of the pressure of 8 Mp into a block shape, and the hunch furnace is sintered at a temperature of 700 ° C for 6 h to enhance the hardness of the zinc kiln slag material. Zinc kiln slag material, spare; detected, the hardness of zinc kiln slag material is 7.8Hb;

[0053] b. Take 10,000 mol (585 kg) of anhydrous sodium chloride and 10000 mol (745 kg) of anhydrous hydrazed potassium chloride. After grinding, mix evenly, first rises to 160 ° C and heat insul...

Embodiment 3-7

[0057] Example 3-7 Method for extracting metal iron from zinc kiln

[0058] Examples 3-7 are a method of extracting metal iron from zinc kiln, and they are based on figure 2 The reacting principle shown is realized, and their steps are substantially the same as in Example 1, and the difference is only the different process parameters, and the details are shown in Table 1:

[0059]

[0060]

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Abstract

The invention discloses a method for extracting metallic iron from zinc kiln slag. The method comprises the following steps of respectively taking the zinc kiln slag and a graphite rod as a negative electrode and a positive electrode, inserting the negative electrode and the positive electrode into a molten salt system formed by mixing and melting sodium chloride and potassium chloride in a protective gas atmosphere, carrying out molten salt constant cell voltage electrolysis reaction, and finally cleaning and drying the negative electrode to obtain the metal iron. The metal iron is obtained. The method is easy to operate, simple in process, high in metal iron recovery rate, low in energy consumption, small in pollutant emission and suitable for industrial production, and solves the problems of low extraction rate and high extraction difficulty caused by a complex zinc kiln slag system in a traditional process; and the method is suitable for extracting the metal iron from the zinc kiln slag.

Description

Technical field [0001] The present invention belongs to the field of metallurgical engineering, involving zinc kiln, specifically a method of extracting metal iron from zinc kiln. Background technique [0002] Zinc kiln is the leaching residue (zinc tailings) produced by the zinc ore after wet loose zinc, which is reduced by high temperature in the rotary kiln, and the residue produced after the metal and other metals are recovered. At present, most of my country's zinc kiln is stacked in a smelter due to the use of homologousness. With the attention of the state's environmental protection, this processing method not only occupies a large amount of land resources, but also the heavy metals in the kiln slag can easily migrate or penetrate into the ground, and cause great damage to the environment. The main chemical composition of zinc fed is iron oxide, silica, calcium oxide and alumina, etc., the main chemical composition and content are as follows: [0003] [0004] It can be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/34
CPCC25C3/34Y02P10/20
Inventor 严红燕罗超李慧梁精龙李晨晓曹卫刚王乐许彦可李运刚
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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