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Method of treating sodium-silicon slag by chlorination method

A technology of chlorination and chlorination slag, which is applied in the field of sodium-silicon slag treatment by chlorination, which can solve the problems of inability to recover alumina, high concentration of sodium aluminate eluate, and low recovery rate of alumina, and facilitate large-scale Industrialized production, reduced production links, and low production costs

Active Publication Date: 2007-10-17
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-pressure hydration method can comprehensively recover the alumina and sodium oxide in it, and the Na in the waste residue 2 O content k 1. Nickel-lined equipment should be used for high-alkali-concentration solutions, which increases investment
This method can recover the alkali, the recovery rate reaches 90%, and can also recover a certain amount of alumina, but the recovery rate of alumina is low, and the A / S in the waste residue is greater than 0.7
This method does not require high temperature and high pressure treatment, and has no special requirements for equipment, but the method has a long process, and the purpose of recovering alumina cannot be achieved in one treatment. In addition, there are many uncertain factors in this method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The method that chlorination method of the present invention handles sodium silicon slag, step is as follows:

[0042] (1) Dry 100 g of sodium-silicon slag, the reducing agent is coke powder, the particle size (d50)=100 um, and the mass ratio of sodium-silicon slag to reducing agent is 10:1. The chlorination temperature is 460-540°C, the chlorination time is 15 minutes, and the controlled flow rate of chlorine gas is 0.2kg / min.kg sodium silicon slag.

[0043] (2) Control the liquid-solid ratio to 5, use distilled water to wash the chlorinated slag at room temperature in a water tank, filter and wash to obtain 60 ml of sodium chloride solution.

[0044] In (3), add the water-washed slag from step (2) to the water tank for washing again. The liquid-solid ratio is controlled at 10, and washed twice until PH=7. After drying, it is added to a high-temperature furnace for roasting. The roasting temperature is 1900 ° C, and the time is 1.5 hours. 40 g of mullite with an alumi...

Embodiment 2

[0046] The method that chlorination method of the present invention handles sodium silicon slag, step is as follows:

[0047] (1) Dry 100 g of sodium-silicon slag, the reducing agent is graphite powder, the particle size (d50) is 80 μm, and the mass ratio of sodium-silicon slag to reducing agent is 10:1. The chlorination temperature is 450-540°C, the chlorination time is 14 minutes, and the chlorine gas control flow rate is 0.2kg / min.kg sodium silicon slag.

[0048] (2) with embodiment 1

[0049] (3) Add the water washing slag obtained in (2) into the reductant carbon powder particle size (d50) 60um, the mass ratio of sodium silicon slag to reducing agent is 7:1, the chlorination temperature is 760-850°C, and the chlorination time is 18min , The chlorine gas control flow rate is 0.4kg / min.kg water washing slag.

[0050] (4) When the chlorinated tail gas is condensed, the condensation point temperature of the silicon tetrachloride solution is 52° C. to obtain 15 ml, and the c...

Embodiment 3

[0053] The method that chlorination method of the present invention handles sodium silicon slag, step is as follows:

[0054] (1) Dry 100 g of sodium-silicon slag, the reducing agent is graphite powder, the particle size (d50) is 80 μm, and the mass ratio of sodium-silicon slag to reducing agent is 5:1. The chlorination temperature is 780-850°C, the chlorination time is 20 minutes, and the chlorine gas control flow rate is 0.45kg / min.kg sodium silicon slag.

[0055] (2) When the chlorinated tail gas is condensed, the condensation point temperature of the silicon tetrachloride solution is 50° C. to obtain 15 ml, and the condensation temperature of the aluminum chloride solution is controlled to 180° C. to obtain 10 ml.

[0056] (3) Control the liquid-solid ratio to 5, use distilled water to wash the chlorinated slag at room temperature in a water tank, filter and wash to obtain 60 ml of sodium chloride solution. Retain 3g of water-washed chloride residue.

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Abstract

The present invention relates to a process for processing sodium white slime through chlorin-ation routeand belongs to the field of non-ferro metals pyrogenic process chlorine metallurgy.Said method comprises the following steps:(1) adding a reducing reagent to sodium white slime, and adding them continuouly to a fluidized bed chlorination furnace to perform a chloridization process to realize a section of selection chloridization of sodium in sodium white slime;(2) washing the chloridized slag with water to get a sodium chloride solution to realize separation of sodium elementand get rinshing slag at the same time;(3) after being washed again and dryed, the rinshing slag being added to a high temperature furnace for a calcinationto get mullite; (4)condensating and separating the chloridized tail gas through a condensatorto get aluminum chloride and silicon tetrachloride solution respectively, wherein the chloridized slags are washed using water and then preserved for making cement. By dealing with waste slags to obtain useful components, the present invention reduces the manufacturing cost of aluminum oxide.

Description

technical field [0001] The invention relates to a method for treating sodium-silicon slag by chlorination, which is used to process waste slag and obtain useful components, and belongs to the field of pyrochlorination metallurgy of nonferrous metals. Background technique [0002] Sodium aluminosilicate hydrate [Na 2 O.Al 2 o 3 .xSiO 2 (6-2x)H 2 O] is sodium silicon slag, which is the most important reaction product of silicon minerals in alkaline treatment of bauxite. The key to the production of alumina by the alkaline method is the separation of aluminum and silicon. During the high-pressure dissolution of diaspore in the domestic Bayer process, almost all silicon minerals are active, and most of them will react with sodium aluminate solution and mainly use sodium Silicon slag enters red mud; in the process of desiliconization of crude liquid by sintering method, more than 90% of SiO 2 It is also precipitated from the solution in the form of sodium silicate slag. So...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B26/10C01D3/04C01F7/56C01B33/06C04B18/14
CPCY02P10/20Y02W30/91
Inventor 高建阳
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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