Method for concentrating titanium white waste acid by utilizing sulfuric-acid production tail gas
A technology for the production of titanium dioxide waste acid and sulfuric acid, applied in separation methods, chemical instruments and methods, sulfur compounds, etc., can solve the problems of slurry blockage of heat exchangers or pipelines, high operation and maintenance costs, and very high equipment requirements. Achieve the effects of lightening the burden, low operation and maintenance costs, and overcoming equipment corrosion
Inactive Publication Date: 2010-04-07
WUHAN QINGJIANG CHEM IND
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Problems solved by technology
At present, most titanium dioxide factories usually use steam heating to evaporate the water in the waste titanium dioxide acid in the reactor or evaporator. Although the efficiency of concentrating the waste titanium dioxide acid in this way is relatively high, the actual production During the process, accidents such as high-temperature fouling and concentrated slurry blockage of heat exchangers or pipelines will occur, which will seriously affect the operating rate of the plant. Moreover, since the concentration of waste acid is carried out at high temperatures, the requirements for equipment are very high, and the investment is large. and higher maintenance costs
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[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.
[0015] The concentration equipment of the embodiment of the present invention is relatively simple, including a waste acid tank, a pump, a spray absorption tower and a gas-liquid separator, wherein the waste acid tank, spray absorption tower and gas-liquid separator are all made of polyvinyl chloride Made of PVC material. Because polyvinyl chloride PVC has bright color, corrosion resistance, and durability, and some auxiliary materials such as plasticizers and anti-aging agents are added in the manufacturing process, its heat resistance, toughness, and ductility are relatively good. Pumps are used to circulate materials between the waste acid tank and the spray absorption tower. There are several nozzles in the spray absorption tower. The exhaust gas produced by sulfuric acid is introduced from the inlet located at the lower part of the spray ...
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The invention discloses a method for concentrating titanium white waste acid by utilizing sulfuric-acid production tail gas. The method comprises the following steps: (1) supplying sulfuric-acid production tail gas to titanium white waste acid sprayed to be in a mist state, concentrating the titanium white waste acid and turning the sulfuric-acid production tail gas from dry gas into wet gas containing steam and titanium white waste acid foam; (2) performing gas-liquid separation on the wet gas, treating and then emptying separated gas, mixing separated liquid with the titanium white waste acid concentrated in a step (1) and then repeatedly concentrating the mixture; and (3) performing sampling test on the titanium white waste acid repeatedly concentrated and recovering the titanium white waste acid when the sulfuric acid content of the titanium white waste acid in percentage by mass is detected to reach over 55 percent. The method has the advantages of simple equipment, convenient operation, low investment, low energy consumption, low operation-maintenance cost, capability of avoiding pipeline blockage because of high-temperature scaling and capability of reducing the pressure to treat sulfuric-acid production tail gas.
Description
technical field [0001] The invention relates to a method for recycling industrial waste, in particular to a method for using sulfuric acid production tail gas to concentrate titanium dioxide waste acid. Background technique [0002] Titanium dioxide waste acid is an industrial waste produced during the production of titanium dioxide, and about 4 to 5 tons of titanium dioxide waste acid is produced for every ton of titanium dioxide produced. Because the content of sulfuric acid in titanium dioxide waste acid is low (about 20%, the mass percent in sulfuric acid, the same below) and contains a large amount of inorganic salts, it cannot be directly recycled. However, if the spent titanium white acid is concentrated so that the sulfuric acid content in the spent titanium white acid reaches more than 55% by mass, most of the inorganic salts will be precipitated, and it can be recycled at this time. At present, most titanium dioxide factories usually use steam heating to evaporate...
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Login to View More IPC IPC(8): C01B17/88B01D53/14
Inventor 张恒明周建锋黄义和陈杨柳绪林熊文凡欧阳兆辉
Owner WUHAN QINGJIANG CHEM IND