Method for reutilizing sulfuric acid method titanium dioxide by-product titanium gypsum

Abstract

The present invention discloses a method for reutilizing a sulfuric acid method titanium dioxide by-product titanium gypsum, and belongs to the field of resource recovery and utilization. The method comprises: carrying out dewatering treatment on titanium gypsum, carrying out calcination treatment, carrying out grinding treatment, compounding the calcined desulfurization gypsum powder and paper fibers with a length of 1-3 mm and obtained by crushing waste paper, compounding a retarding agent, carrying out mixing treatment, naturally curing, and carrying out baking treatment. According to the present invention, by carrying out modification compounding treatment on the titanium gypsum, the titanium gypsum is reasonably utilized, the prepared gypsum building block wall material meets the performance index requirements, the characteristics of environmental protection and low cost are provided, and the method is suitable for promotion and application.

Description

technical field [0001] The invention belongs to the field of resource recovery and utilization, and in particular relates to a method for reusing titanium dioxide by-product of sulfuric acid process to produce titanium gypsum. Background technique [0002] The Panzhihua area has very rich resources of vanadium-titanium magnetite. Vanadium-titanium magnetite can be selected through beneficiation to select ferrovanadium concentrate and titanium concentrate. Titanium concentrate can be directly used in sulfuric acid process to produce titanium dioxide, and can also be produced through smelting. High-titanium slag, high-titanium slag can be used to produce titanium dioxide by sulfuric acid method. The advantages of sulfuric acid production of titanium dioxide are less investment and stable product quality. The disadvantage is that the discharge of three wastes is relatively large. The three wastes mainly include waste gas, waste residue and waste water. Wastewater is mainly acid...

AI Technical Summary

Problems solved by technology

[0002] The Panzhihua area has very rich resources of vanadium-titanium magnetite. Vanadium-titanium magnetite can be selected through beneficiation to select ferrovanadium concentrate and titanium concentrate. Titanium concentrate can be directly used in sulfuric acid process to produce titanium dioxide, and can also be produced through smelting. High-titanium slag, high-titanium slag can be used to produce titanium dioxide by sulfuric acid method. The advantages of sulfuric acid production of titanium dioxide are less investment and stable product quality. The disadvantage is that the discharge of three wastes is relatively large. The three wastes mainly include waste gas, waste residue and waste water. Wastewater is mainly acidic wastewater. For the treatment of acidic wastewater, the common treatment method in various industries is to discharge it in the way of lime neutralization. Medium ash has the advantage of low treatment cost, but the disadvantage is that it will cause secondary pollution. According to According to statistics, sulfuric acid method is used to produce titanium dioxide, and about 4 to 4.5 tons of titanium gypsum are produced for each ton of titanium dioxide produced, and the produced titanium gypsum gradually accumulates, occupying land resources on the one hand, and causing serious pollution to the environment on the other hand

The chemical composition of titanium gypsum is complex, the content of impurities is high, and the performance of titanium gypsum is quite different from that of natural gypsum. The development and application of titanium gypsum has great technical difficulties