A kind of method that utilizes sodium silicate slag to prepare polyaluminum chloride

A polyaluminum chloride, sodium silicon technology, applied in aluminum chloride, aluminum halide, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of calcium carbonate and other slag phases entering red mud, poor economy, and low recovery rate , to achieve the effect of reducing production costs, increasing pH, and increasing basicity

Active Publication Date: 2020-01-07
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low recovery rate and poor economic efficiency of this method, a large amount of calcium carbonate and other slag phases will enter the red mud, etc., so far it is only in the research stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1 of the present invention utilizes sodium silicate slag to prepare the method for polyaluminium chloride, and described method comprises:

[0030] 1) Prepare the reaction mixture sodium-silicon slag and aluminum hydroxide. The sodium-silicon slag is the product of crude liquid desilication in the production of alumina by sintering method. The sodium-silicon slag mainly contains Al 2 o 3 %: 22.20%, CaO %: 40%, SiO 2 %: 3.08%; The aluminum hydroxide is a commercially available powder product;

[0031] Put the first batch of sodium-silicon slag and aluminum hydroxide in hydrochloric acid for stripping reaction to obtain a stripping liquid. The time for the stripping reaction is 1 hour and the temperature is 160°C; the weight of the first batch of sodium-silicon slag and aluminum hydroxide is The ratio is 3.1:1.7; in the dissolution reaction, the molar ratio of chloride ion to aluminum ion is 1.8, the above ratio is selected to control the polyaluminum chlorid...

Embodiment 2

[0036] Embodiment 2 of the present invention utilizes sodium silicate slag to prepare the method for polyaluminium chloride, and described method comprises:

[0037] 1) prepare reaction mixture material sodium silicon slag and aluminum hydroxide, similar to embodiment 1;

[0038]The first batch of sodium silicate slag, aluminum hydroxide and the filter residue obtained from the previous polymerization reaction are used as raw materials (such as the filter residue obtained in step 2 in Example 1), and they are placed in hydrochloric acid together for stripping reaction to obtain stripped liquid. The dissolution reaction time is 2 hours, and the temperature is 150° C.; the weight ratio of the ingredients is controlled as follows: the first batch of sodium silicon slag: aluminum hydroxide: filter residue = 2.1:2.1:0.2. In the stripping reaction, the molar ratio of chloride ion to aluminum ion is 2.2. The above ratio is selected to control the polyaluminum chloride product and avo...

Embodiment 3

[0043] Embodiment 3 of the present invention utilizes sodium silicon slag to prepare the method for polyaluminum chloride, and described method comprises:

[0044] 1) prepare reaction mixture material sodium silicon slag and aluminum hydroxide, similar to embodiment 1;

[0045] The first batch of sodium silicate slag, aluminum hydroxide and the filter residue obtained by the previous polymerization reaction are used as raw materials (such as the filter residue obtained in step 2 in embodiment 1 or 2), and are placed in hydrochloric acid together for stripping reaction to obtain stripping liquid. The dissolution reaction time is 4 hours, the temperature is 130° C.; the weight ratio of the ingredients is controlled as follows: the first batch of sodium silicon slag: aluminum hydroxide: filter residue=2.6:1.9:0.4. In the stripping reaction, the molar ratio of chloride ion to aluminum ion is 3.1. The above ratio is selected to control the polyaluminum chloride product and avoid ob...

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Abstract

The invention discloses a method for preparation of polyaluminum chloride from sodium-silicon slag. The method includes: 1) placing a first batch of sodium-silicon slag and aluminum hydroxide in hydrochloric acid and carrying out dissolution reaction for 1-6h at 120-160DEG C to obtain dissolved liquid, wherein the mole ratio of chlorine ions to aluminum ions is 1.8-3.5; and 2) adding a second batch of sodium-silicon slag into the dissolved liquid, carrying out polymerization reaction for 0.5-3h at 50-110DEG C, and conducting solid-liquid separation to obtain a polyaluminum chloride solution and filter residue. The method provided by the invention adopts sodium-silicon slag as the raw material to acquire polyaluminum chloride, the production method is simple and economical, not only makes full use of the raw material sodium-silicon slag, but also greatly lowers the production cost of polyaluminum chloride.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, and in particular relates to a method for preparing polyaluminum chloride by using sodium-silicon slag. Background technique [0002] In the production of alumina by sintering method, when deep desilication is required in the crude liquid, the slag phase composition is mainly hydrated garnet 3CaO·Al 2 o 3 · xSiO 2 ·(6-2x)H 2 O, where x is (0.1-0.2), it is called sodium-silicon slag. Theoretically, the alumina content in sodium-silicon slag is about 26%, and the A / S ratio in the slag phase is relatively high. At present, the alumina content in sodium-silicon slag in production is also greater than 20%. Therefore, how to turn waste into treasure and recycle the alumina in it Aluminum or seeking other ways to utilize sodium-silicon slag is the direction of research. [0003] At present, in production, the sodium-silicon slag is returned to the sintering workshop for batching, and then...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C01F7/56C02F1/52
Inventor高建阳杜善国刁克建姚毅陈玉海姜梅郑霞岳巍
OwnerGUIZHOU BRANCH CHINA ALUMINUM IND