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Method for preparing gypsum by free sulfuric acid in titanium dioxide wastewater

A technology for titanium dioxide wastewater and gypsum, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of high consumption, high cost and cost, waste of land resources, etc., and achieve the effect of reducing cost and reducing production

Inactive Publication Date: 2013-04-24
FEDERAL ENVIRONMENTAL & ECOLOGICAL ENG SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The solid waste generated by this method needs to be piled up, which not only costs a lot of neutralization cost but also consumes a lot of land to pile up the waste residue. The sludge landfill fee in the operation cost accounts for 20% of the sewage treatment cost, and the sludge generated after treatment has no use value. , landfill as inorganic waste
This requires a large area of ​​slag yard, which not only wastes land resources, but also produces a lot of pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for producing gypsum by utilizing free sulfuric acid in titanium dioxide wastewater, comprising the following steps:

[0022] a. Collect the acidic wastewater generated during the production of sulfuric acid titanium dioxide into the regulating tank, and control the acidity between 2-5%;

[0023] b. The acid waste water in the regulating pool is 400m 3 It is transported into the reaction tank at a speed of / h. The reaction tank is a steel concrete structure with three reaction zones. At the same time, the limestone mineral powder slurry ground by the grinding equipment is added to the reaction tank to neutralize the free sulfuric acid. The grinding equipment used is Ball mill, the fineness of limestone powder is 100 mesh, and the purity is over 95%. There are stirring equipment in the three reaction zones. The stirring equipment is a mechanical mixer with a stirring speed of 80r / min. Fully react in the reaction zone, the reaction time is 60-90 minutes, and the...

Embodiment 2

[0028] The rest are the same as in Example 1, except that the fineness of the limestone powder is 200 mesh.

Embodiment 3

[0030] The rest are the same as in Example 1, except that the fineness of the limestone powder is 300 mesh.

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Abstract

The invention discloses a method for preparing gypsum by free sulfuric acid in titanium dioxide wastewater. The method comprises the following steps of: a: collecting acidic wastewater produced by a sulfuric acid method in a production process of titanium dioxide in an adjusting tank; b: transporting the acidic wastewater in the adjusting tank into a reaction tank, and at the same time, adding limestone mineral powder slurry ground by grinding equipment in the reaction tank to neutralize free sulfuric acid; c: transporting the prepared gypsum slurry into a precipitation tank, and fully dehydrating to prepare crude gypsum; d: washing the prepared crude gypsum with a little clean water, and finally washing with a little lime milk solution; and e: secondarily squeezing the washed crude gypsum and fully dehydrating to prepare the gypsum product. The method has the beneficial effects that the gypsum is prepared by free sulfuric acid in the wastewater, stable emission standard of the wastewater can be guaranteed, and solid slag produced by the sulfuric acid method in a wastewater processing technology of titanium dioxide becomes treasure from waste, so that in the whole processing process, the output of solid waste is greatly reduced, and therefore, the cost of wastewater processing is greatly reduced.

Description

technical field [0001] The invention relates to a comprehensive utilization method of industrial waste, in particular to a method for preparing gypsum by utilizing free sulfuric acid in titanium white wastewater. Background technique [0002] In the sulfuric acid titanium dioxide production process, every ton of titanium dioxide produced will produce 5-6 tons of dilute sulfuric acid with a concentration of 20%-25%. In addition, the acidic wastewater produced during the production process of every ton of titanium dioxide includes acidolysis tail gas washing water, calcination tail gas washing water, primary washing wastewater, equipment washing water and ground washing water, and its production volume is 50-80m 3 (the content of sulfuric acid is about 2%, containing a small amount of ferrous sulfate and titanium dioxide), which has caused serious environmental pollution and wasted a large amount of available resources in vain. At present, the treatment of wastewater generate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46C04B11/02
Inventor 朱军邓勇吴兆荣
Owner FEDERAL ENVIRONMENTAL & ECOLOGICAL ENG SUZHOU
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