Method for treating waste acid produced from titanium dioxide production using vitriol method

A titanium dioxide, sulfuric acid method, applied in sulfur trioxide/sulfuric acid, osmosis/dialysis water/sewage treatment, etc., can solve the problems of low utilization of permeate, high energy consumption, waste of acid resources, etc., and achieve recovery rate The effect of high, high purity and low processing cost

Inactive Publication Date: 2007-05-23
上海闵欣环保设备工程有限公司
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Problems solved by technology

The main disadvantage of this method is: a large amount of solid waste is produced, mainly containing calcium sulfate, iron hydroxide and various slag particles, and it causes waste of acid resources
The main disadvantages of this method are: high energy consumption and high processing costs
The main disadvantage of this method is that both the dialysate and the permeate contain sulfuric acid and ferrous sulfate, and the utilization of the permeate is not high.

Method used

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  • Method for treating waste acid produced from titanium dioxide production using vitriol method

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Embodiment

[0013] As shown in Figure 1, it is a schematic diagram of the process flow of the present invention, a method of producing waste acid in the process of producing titanium dioxide by sulfuric acid process, which is to filter and dialysis the waste acid produced in the process of producing titanium dioxide by sulfuric acid process, and the dialysate Through nanofiltration, then enter the subsequent reverse osmosis process for concentration, the method is:

[0014] Step 1. Put the waste acid into a 5um precision filter through a high-pressure corrosion-resistant pump for filtration, the filtrate enters the container, and the filter residue is returned to the titanium dioxide production process for reuse;

[0015] The second step. The tap water and the filtered waste acid enter the two inlets of the diffusion dialyzer respectively, and the flow rate is controlled to 0.01m 3 / d, make the residence time 8-12 hours, carry out sulfuric acid H 2 SO 4 and ferrous sulfate FeSO 4 The f...

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Abstract

The invention relates to a way to treat spent acid in the sulfuric acid method to produce titanium pigment. The characteristic of the invention: the method includes the following steps: pulping the spent acid into the sophisticated filtrator through the high pressure anti-corrosion pulp, the filtrate entering the container; the tap water and filtered spent acid going separately into the two inlets of the diffuse dialyzator, separating for the first time the strong H2SO4 from FeSO4 in the permeating solution, the separated strong permeating solution is pulped into the nano-filter membrane to separate H2SO4 for the second time, the content of FeSO4 in the solution is 0.1% or less; the separated permeating solution H2SO4 goes into the reverse osmosis membrane device and the concentrated solution is the dilute sulfuric acid product. The advantage of the invention includes high spent acid recovery rate, high purity, low processing cost and high holding-up rate.

Description

technical field [0001] The invention relates to a method for treating waste acid produced in the process of producing titanium dioxide by a sulfuric acid method, so that the treated waste acid can be comprehensively utilized, and belongs to the technical field of environmental protection. Background technique [0002] The biggest development problem facing the production of titanium dioxide by the sulfuric acid method is that a large amount of waste acid produced in the production process cannot be used comprehensively and efficiently, which will cause pollution to the environment. There are three main methods of treating this waste acid at home and abroad: one is to use The lime neutralization method, the second is the concentration treatment recycling method, and the third is the diffusion dialysis method. Titanium dioxide waste acid mainly contains about 15% sulfuric acid, about 20% ferrous sulfate and a small amount of titanium powder particles. The lime neutralization ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/90C02F1/44
Inventor 张峰沈伟祥任义生
Owner 上海闵欣环保设备工程有限公司
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