Waste acid double-effect concentration and recycling method for titanium dioxide production enterprises

A double-effect concentration, titanium dioxide technology, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of ineffective utilization and too thin waste acid concentration, saving energy consumption, reducing equipment wear, The effect of prolonging the driving cycle

Active Publication Date: 2020-01-17
XIANGYANG LOMON TITANIUM IND CO LTD
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem that the waste acid concentration produced by titanium dioxide production enterprises in the prior art is too dilute to be effectively utilized, the present invention provides a double-effect concentration recycling method for waste acid used in titanium dioxide production enterprises. The purpose is to:

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] In this embodiment, double-effect concentration equipment is used for testing. Specific steps are as follows:

[0035] Step 1: After opening the connecting valve at the bottom of the first-effect concentration device and the second-effect concentration device, start the dilute sulfuric acid feeding pump to add about 24% dilute sulfuric acid to the system until the overflow pipe of the second-effect evaporator overflows to 36% concentrated acid transfer About 500mm above the acid inlet of the tank, stop the feed pump. Close the connecting valve at the bottom of the first-effect concentrator to the second-effect concentrator.

[0036] Step 2: Start two forced circulation pumps according to the specifications, and the raw material liquid is forced to circulate and exchange heat in each circuit. Then according to the specification (start the acid circulation water pump, the water pump and the cooling tower fan, adjust the outlet valve opening of the water pump, so that th...

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Abstract

The invention belongs to the technical field of green chemical engineering, and particularly relates to a waste acid double-effect concentration recycling method for titanium dioxide production enterprises. The method is capable of solving the problem that in recycling process of waste acid generated in titanium dioxide production enterprises in the prior art, effective utilization is difficult torealize because of too low waste acid concentration. The technical scheme comprises the following steps: (1) feeding the waste acid from titanium dioxide production process into a storage tank, and then pumping the waste acid into a primary evaporator for negative-pressure low-temperature evaporation and concentration; [2] pumping primary concentrated acid obtained after evaporation and concentration in the primary evaporator into a preheater for preheating through a pump, and then pumping the acid into a secondary evaporator to be subjected to negative-pressure medium-temperature evaporationand concentration; and (3) enabling secondary concentrated acid obtained after concentration in secondary evaporator to automatically flow into a curing tank, and then pumping the acid to a next process. The method is used for recycling the waste acid obtained in the titanium dioxide production process.

Description

technical field [0001] The invention belongs to the technical field of green chemical industry, and in particular relates to a double-effect concentration recycling method for waste acid used in titanium dioxide production enterprises. Background technique [0002] Titanium dioxide production enterprises usually need to use a large amount of sulfuric acid with a concentration of 55%, and also produce a large amount of waste sulfuric acid. If the waste acid can be used to prepare sulfuric acid with a concentration of 55% required by the process, the sulfuric acid resource can be effectively utilized and the environmental protection pressure brought about by waste acid treatment can be reduced. [0003] However, the concentration of waste acid is usually low, so that it is still necessary to use a large amount of sulfuric acid with a concentration of 98% to adjust the concentration during preparation, and a large amount of waste acid cannot be effectively utilized and can only...

Claims

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Application Information

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IPC IPC(8): C01B17/88
CPCC01B17/88
Inventor 曾小林何燕燕王国锋朱严彭本铃
Owner XIANGYANG LOMON TITANIUM IND CO LTD
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