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Method for treating waste sulfuric acid solution by using sodium pyrophosphate

A technology of sodium pyrophosphate and sulfuric acid solution, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problem of high cost, achieve the effects of reducing pressure, improving the working environment, and improving economic efficiency

Inactive Publication Date: 2019-07-09
CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the cost of the existing method for treating waste sulfuric acid solution is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 100g containing concentration is 20% sulfuric acid, waste sulfuric acid solution of 2~3% ferrous sulfate and 89g sodium pyrophosphate are separately placed in the same airtight container at normal temperature to obtain concentration after 1 week and be 50% sulfuric acid solution and ten Sodium pyrophosphate water, returning 50% sulfuric acid solution to the step of preparing titanium dioxide by sulfuric acid method, drying sodium pyrophosphate decahydrate at 100-105°C to remove crystal water, and continuing to treat waste sulfuric acid solution.

Embodiment 2

[0033] 100g containing 20% ​​sulfuric acid, 2-3% ferrous sulfate waste sulfuric acid solution and 178g sodium pyrophosphate were separately placed in an airtight container at normal temperature for 3.5 days to obtain a 50% sulfuric acid solution and pentahydrate coke Sodium phosphate, returning 50% sulfuric acid solution to the step of preparing titanium dioxide by sulfuric acid method, drying sodium pyrophosphate pentahydrate at 100-105°C to remove crystal water, and continuing to treat waste sulfuric acid solution.

Embodiment 3

[0035] In order to increase the usage rate of sodium pyrophosphate, the "countercurrent" operation mode can be adopted.

[0036] The sodium pyrophosphate pentahydrate that embodiment 2 obtains and 100g containing the sulfuric acid that concentration is 20%, the waste sulfuric acid solution of the ferrous sulfate of 2~3% is separately placed in the same airtight container at normal temperature, obtains concentration after 1 week is 50% sulfuric acid solution and sodium pyrophosphate decahydrate, drying the sodium pyrophosphate decahydrate at 100-105° C. to remove crystal water to obtain sodium pyrophosphate, which is continued to be used to treat waste sulfuric acid solution.

[0037] The sulfuric acid solution with a concentration of 50% continues to be placed separately from the sodium pyrophosphate in an airtight container at room temperature, and after half a week, a sulfuric acid solution with a concentration of 55% is obtained, which is returned to the step of preparing ti...

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PUM

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Abstract

The invention belongs to the technical field of waste acid solution treatment, and particularly relates to a method for treating a waste sulfuric acid solution by using sodium pyrophosphate. The technical problem to be solved by the invention is that an existing method for treating a waste sulfuric acid solution is relatively high in cost. The disclosed method for treating the waste sulfuric acidsolution by using sodium pyrophosphate comprises the following steps: separately placing sodium pyrophosphate and the waste sulfuric acid solution in a same closed container at normal temperature, andcarrying out treatment until the mass concentration of sulfuric acid in the waste sulfuric acid solution is 50-55%, so that a treated sulfuric acid solution and water-containing sodium pyrophosphateare obtained. Through adoption of the method disclosed by the invention, the concentration of the waste sulfuric acid solution is improved, the waste raw materials are effectively utilized, pressure caused to the environment is reduced, and cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of waste acid solution treatment, and in particular relates to a method for treating waste sulfuric acid solution with sodium pyrophosphate. Background technique [0002] Titanium dioxide is an excellent white pigment, which is widely used in paints, coatings, paper, plastics and welding electrodes and other industries. [0003] At present, the processes for producing titanium dioxide mainly include the sulfuric acid method and the chlorination method. The two processes coexist, and the production capacity and output are very large. However, both production processes have certain environmental pressures. For the sulfuric acid production process, a large amount of hydrolysis waste acid and green vitriol (FeSO 4 ·7H 2 O). When using titanium concentrate (the main component is iron metatitanate FeTiO 3 , wherein the content of titanium dioxide is 45-50% by weight) as raw material, generally producing 1 ton...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/88
CPCC01B17/88
Inventor 穆宏波穆天柱邓斌
Owner CHENGDU ADVANCED METAL MATERIALS IND TECH RES INST CO LTD