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A method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier

A technology of water purifying agent and red mud, applied in the field of resources and environment, can solve the problems of high cost of concentrated waste acid, high cost of neutralization, solid waste of calcium sulfate, etc., achieve significant economic and environmental benefits, easy operation, and comprehensive cost low effect

Active Publication Date: 2022-04-01
TIANJIN UNIVERSITY OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing methods of disposing of iron-containing waste acid are mainly to concentrate the waste acid to reach a concentration of more than 65% after removing iron from the waste acid, and then use it again with acid. However, the cost of concentrating the waste acid is huge and the equipment is severely corroded; and disposal, but the cost of neutralization is also huge, and neutralization with calcium oxide will also produce a large amount of calcium sulfate solid waste

Method used

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  • A method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier
  • A method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier

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Embodiment 1

[0036] A method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier, the process is as follows figure 1 As shown, the steps are as follows:

[0037] (1) Weighing 2000kg of Bayer red mud (1000kg dry, containing iron oxide 30wt%, titanium dioxide 6wt%, moisture 50wt%, sodium hydroxide, silicon, calcium and other components 14wt%) and 700kg titanium white waste sulfuric acid ( Containing sulfuric acid 40wt%, titanium dioxide 3wt%) into the reaction equipment, start stirring, heating and maintaining the reaction temperature of 65 ° C for neutralization reaction, until the pH is 3.5 to stop the reaction;

[0038] (2) The material after the reaction enters the filter press and carries out solid-liquid separation, and the main component of liquid is ferric sulfate, ferrous sulfate, sodium sulfate etc.; The main component of solid is silicon dioxide, titanium dioxide, calcium sulfate;

[0039](3) 150kg of 30% hydrogen peroxide wa...

Embodiment 2

[0041] A method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier, the process is as follows figure 1 As shown, the steps are as follows:

[0042] (1) Weigh 2000kg of Bayer red mud (1000kg dry, containing 30wt% iron oxide, 6wt% titanium dioxide, 50wt% moisture, 14wt% other components such as sodium hydroxide, silicon, calcium) and 3500kg carbon steel pickling waste Sulfuric acid (containing sulfuric acid 10wt%, iron-containing 9.2wt%) was added to the reaction equipment, started stirring, heated and kept the reaction temperature at 75°C for neutralization reaction until the pH was 2.5 to stop the reaction;

[0043] (2) material after reaction enters filter press and carries out solid-liquid separation, and the main component of liquid is ferric sulfate, ferrous sulfate, sodium sulfate; The main component of solid is silicon dioxide, titanium dioxide, calcium sulfate;

[0044] (3) 70kg of 30% hydrogen peroxide was added ...

Embodiment 3

[0046] A method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier, the process is as follows figure 1 As shown, the steps are as follows:

[0047] (1) Weigh 2000kg of combined red mud (1400kg dry, containing 5wt% iron oxide, 7wt% titanium dioxide, 30wt% moisture, 13wt% silicon dioxide, 35wt% calcium oxide, 10wt% other components) and 5000kg carbon steel Pickling waste hydrochloric acid (containing 10wt% hydrochloric acid and 10wt% iron) was added to the reaction equipment, started stirring, heating and maintaining the reaction temperature of 80°C for neutralization reaction until the pH was 5 to stop the reaction;

[0048] (2) The material after the reaction enters the filter press and carries out solid-liquid separation, and the main component of liquid is ferric chloride, ferrous chloride, calcium chloride, sodium chloride; The main component of solid is silicon dioxide, titanium dioxide;

[0049] (3) 170kg of 30% hyd...

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Abstract

The invention relates to the technical field of resources and environment, and provides a method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier, including the following steps: (1) mixing red mud and iron-containing waste acid and react to obtain a reaction material; (2) carry out solid-liquid separation of the reaction material to obtain a liquid and a solid respectively; (3) mix the liquid with an oxidant to obtain a water purifying agent after polymerization; Dry to obtain titanium-rich slag. The invention utilizes iron-containing waste acid to dissolve the soluble part in the red mud to produce a water purifying agent; at the same time, the titanium in the insoluble part of the red mud is enriched to produce titanium-rich slag. The invention realizes the common resource disposal of red mud and iron-containing waste acid, obtains high-value products, achieves zero discharge of waste, and has low comprehensive cost; moreover, the invention has reasonable process, simple and convenient operation, and remarkable economical advantages. benefits and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of resources and environment, in particular to a method for co-processing red mud and iron-containing waste acid to produce titanium-rich slag and water purifier. Background technique [0002] Red mud is the main solid waste in the alumina industry. Red mud generally contains 25 to 50 wt% of water. The main solid components are alumina, iron oxide, calcium oxide, silica and sodium alkali, and a small amount of titanium dioxide. , scandium oxide and magnesium oxide, etc., the chemical composition of red mud is shown in Table 1. Due to the difference in aluminum ore raw materials and production processes, about 0.5-2.5 tons of red mud is produced for every 1 ton of alumina produced. At present, the cumulative stockpiles of red mud in various parts of my country have reached more than 300 million tons, and the comprehensive utilization rate of red mud is only about 10%, and the cost is relatively high. With t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/66C02F11/00B09B3/70
CPCC02F1/66C02F11/00B09B3/00
Inventor 李梅彤袁文蛟张柯范文浩徐元张又天
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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