Method for producing aluminum hydroxide under normal temperature and pressure

Abstract

The invention discloses a method for producing aluminum hydroxide under normal temperature and pressure, through using multicomponent burnt adjuvant comprising the following constituents (by weight portions): industrial sodium carbonate 40-360, industrial sodium carbonate 40-400 parts, industrial sodium sulphate 5-30 parts, industrial boric acid 5-30 parts, industrial barium sulphate 5-50 parts, industrial ammonium fluoride 1-10 parts, industrial aluminun fluoride 1-10 parts, dissolving these constituents into water, mixing with medium or low grade aluminum-containing ore or discarded resource, charging into kilns for agglomeration to obtain calcium aluminate, charging calcium aluminate into alkaline liquor to dissolve AL2O3 out, filtering, subjecting the filter liquor to desiliconisation edulcoration for carbonation and decomposition, crystallizing, scouring, centrifugal dehydrating, and finally drying to obtain the aluminum hydroxide.

Description

Technical field: [0001] The invention relates to a method for producing aluminum hydroxide, in particular to a method for producing aluminum hydroxide by using middle and low-grade aluminum-containing ore or waste resources as raw materials at normal temperature and pressure. Background technique: [0002] In my country's bauxite resources or waste resources, low- and medium-grade aluminum-containing ores such as high-silicon, high-iron, low-aluminum or low-aluminum-silicon ratio tailings, abandoned ore, industrial solid waste such as fly ash, slag, coal gangue, Bauxite, kyanite, andalusite, sillimanite, nepheline, kappa nepheline, muscovite, leucite, albite, analcite, sericite, kaolinite, alunite, etc., among these resources AL 2 o 3 The bauxite content is only 15-50%, which accounts for a considerable proportion in our country, and these resources have not been fully utilized so far. The development and utilization of such low-grade bauxite resources has important social s...

AI Technical Summary

Problems solved by technology

[0002] In my country's bauxite resources or waste resources, low- and medium-grade aluminum-containing ores such as high-silicon, high-iron, low-aluminum or low-aluminum-silicon ratio tailings, abandoned ore, industrial solid waste such as fly ash, slag, coal gangue, Bauxite, kyanite, andalusite, sillimanite, nepheline, kappa nepheline, muscovite, leucite, albite, analcite, sericite, kaolinite, alunite, etc., among these resources AL 2 o 3 The bauxite content is only 15-50%, which accounts for a considerable proportion in our country, and these resources have not been fully utilized so far. The development and utilization of such low-grade bauxite resources has important social significance for the rational use of national resources. Economic and practical significance; on the other hand, with the development of my country's industry, the demand for bauxite has increased sharply, making the supply of bauxite increasingly tight, especially the supply of high-quality bauxite will not be able to meet the needs of alumina or hydrogen. The need for alumina production has caused the production cost of alumina and aluminum hydroxide to rise, and ore resources have become more and more restrictive factors for the development of the aluminum industry