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A method for preparing polyaluminum silicate flocculant from silica-alumina slag

A technology of polyaluminosilicate and silica-alumina slag, which is applied in the direction of aluminum silicate, silicate, chemical instruments and methods, etc., can solve the problems of affecting ecological balance, polluting the environment, occupying land, etc., and achieves easy operation and smooth process and device simple effect

Active Publication Date: 2019-12-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the waste slag produced by water treatment production enterprises, silicon-aluminum slag is mainly stacked in the open air at present. Since the slag contains a large amount of valuable elements such as silicon and aluminum and other harmful elements, stacking treatment will not only waste resources, but also occupy land and pollute The environment, affecting the ecological balance, has great potential harm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing polyaluminum silicate flocculant from silica-alumina slag described in this embodiment, through the following steps:

[0023] A. Weigh 500 grams of silicon-aluminum slag. The silicon-aluminum slag is the industrial waste slag obtained by separating low-grade bauxite through sulfuric acid normal temperature and pressure leaching to prepare water treatment agent. The main components are: SiO 2 Content 80%, Al 2 o 3 Content 18%, TiO 2 Content 2%, crystal water 50%, put it in a ceramic vessel and place it in a microwave oven, treat it at 500W for 5 minutes, then place it in a high-temperature furnace, calcinate at 600°C for 1.5 hours, cool to room temperature and grind Until all the materials pass through the 120-mesh sieve;

[0024] B. Add H to the reactor 2 SO 4 2000 grams of sulfuric acid solution with a mass concentration of 6% was heated up to 70° C., and then the ground material obtained in step A was added under stirring conditions, leache...

Embodiment 2

[0030] A method for preparing polyaluminum silicate flocculant from silica-alumina slag described in this embodiment, through the following steps:

[0031] A. Weigh 500 grams of silicon-aluminum slag. The silicon-aluminum slag is the industrial waste slag obtained by separating low-grade bauxite through sulfuric acid normal temperature and pressure leaching to prepare water treatment agent. Its main components are: SiO 2 Content 85%, Al 2 o 3 Content 14%, TiO 2 Content 1%, crystalline water 45%, put it in a ceramic vessel and place it in a microwave oven, treat it at 300W for 10 minutes, then place it in a high-temperature furnace, calcinate at 500°C for 2.0 hours, cool to room temperature and grind Until all the materials pass through the 120-mesh sieve;

[0032] B. Add H to the reactor 2 SO 4 3000 grams of sulfuric acid solution with a mass concentration of 4% was heated up to 90° C., and then the ground material obtained in step A was added under stirring conditions, l...

Embodiment 3

[0038] A method for preparing polyaluminum silicate flocculant from silica-alumina slag described in this embodiment, through the following steps:

[0039] A. Weigh 500 grams of silicon-aluminum slag. The silicon-aluminum slag is the industrial waste slag obtained by separating low-grade bauxite through sulfuric acid normal temperature and pressure leaching to prepare water treatment agent. Its main components are: SiO 2 Content 82%, Al 2 o 3 Content 15%, TiO 2 Content 3%, crystalline water 44%, put it in a ceramic vessel and place it in a microwave oven at 400W power for 8 minutes, then place it in a high-temperature furnace, calcinate at 700°C for 1.0 hour, cool to room temperature and grind to All materials pass through a 120-mesh sieve;

[0040] B. Add H to the reactor 2 SO 4 2500 grams of sulfuric acid solution with a mass concentration of 5% was heated up to 80° C., and then the ground material obtained in step A was added under stirring conditions, leached for 3 ho...

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Abstract

The invention discloses a method for preparation of a polysilicate aluminum flocculant from silicon aluminum slag. The method includes: conducting microwave activation and high temperature calcination on silicon aluminum slag, and performing acid solution leaching to obtain an aluminum-containing aqueous solution; dissolving the solid material separated by acid solution leaching in an alkaline solution, and performing separation, introducing CO2 gas into alkaline leachate to perform carbonization, and then conducting separation and washing to obtain silicic acid hydrate; mixing the aluminum-containing aqueous solution obtained by acid solution leaching with the silicic acid hydrate, and adding an aluminum source to regulate Al / Si mole ratio of the mixed system, and carrying out polymerization and aging to obtain the polysilicate aluminum flocculant. The method provided by the invention has the advantages of simple process equipment, easy operation and safety, is a technological route utilizing industrial waste to produce water treatment agents with wide application scope and realizing effective utilization of resources, can achieve comprehensive utilization of secondary resources, and reaches the purposes of recycling economy, energy saving and emission reduction.

Description

technical field [0001] The invention belongs to the field of solid waste utilization in the chemical industry, and specifically relates to a method for secondary utilization of industrial waste slag produced in the production process of industrial water treatment agents, and more specifically relates to a method for preparing polyaluminum silicate flocculants from silica-alumina slag method. Background technique [0002] Polysilicate aluminum salt is a new type of inorganic polymer flocculant, which is a composite product of polysilicate and aluminum salt developed on the basis of activated silicic acid (polysilicate) and aluminum salt flocculant. Electroneutralization and adsorption bridging. The development of this type of flocculant began in the late 1980s in foreign countries, and in the early 1990s in China. Because this type of flocculant has the advantages of good coagulation effect, low price, and low residual aluminum in the treated water, its treatment The effect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/52C01B33/26
CPCC01B33/26C02F1/5236
Inventor 苏毅孙成郑峰伟李国斌罗康碧李沪萍胡亮梅毅
Owner KUNMING UNIV OF SCI & TECH
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