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Recovery method of waste hydrochloric acid solution in rutile process prepared by hydrochloric acid method

A recovery method, the technology of the hydrochloric acid method, is applied in the field of recovery and treatment of waste hydrochloric acid solution in the process of preparing rutile by the hydrochloric acid method, which can solve the problems of difficult treatment, secondary pollution, difficult separation, etc., and achieve simple and easy process, no environmental pollution, The effect of good economic benefits

Active Publication Date: 2017-06-16
PANGANG GRP MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] That is, the total acid value concentration is generally between 80 and 120g / L; for this part of the waste hydrochloric acid solution, the total acid value concentration is low, and contains impurities such as calcium, magnesium and iron, and the traditional oxidation neutralization method or acid acid separation method is used. more difficult to handle
The oxidation neutralization method is to oxidize ferrous ions into ferric ions, which are hydrolyzed into iron oxide under the neutralization of alkaline substances; since the hydrolysis of ferric ions and the growth of ferric oxide crystallization are complex multiple reaction processes, It is generally difficult to separate, but using lime neutralization method to treat waste acid will produce a large amount of waste residue, causing serious secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The main components of the waste hydrochloric acid used are the total acid value of 98.76g / L, free acid 71.63g / L, Fe 2+ 18.54g / L, Fe 3+ 10.09g / L, Ca 2+ 2.12g / L, Mg 2+ 4. 21g / L solution (without removing impurities), first use a filter to remove impurities in the solution, and then heat (heating temperature is 80-85°C) to pre-concentrate the solution by about 25% of the solution volume to its acid value The concentration is 123.56g / L, and then the concentrated solution is heated twice (heating temperature is 80-85°C) to concentrate about 25% until its acid value is 172.15g / L, and the solution after the second concentration is atomized by a spray gun Spray into the roasting furnace (among them, the spray pressure is 0.35~0.50Mpa; the spray flow rate is 3~3.5m 3 / h), thermal decomposition occurs under a high-temperature oxidizing atmosphere at 750°C to generate hydrogen chloride gas and solid oxides, and the outlet temperature of hydrogen chloride gas after spray roasti...

Embodiment 2

[0047]The main components of the waste hydrochloric acid used are the total acid value of 103.52g / L, free acid 73.64g / L, Fe 2+ 20.30g / L, Fe 3+ 11.58g / L, Ca 2+ 2.56g / L, Mg 2+ 4.69g / L solution (without removing impurities), first use a filter to remove impurities in the solution, and then heat (heating temperature is 80-85°C) to pre-concentrate the solution by about 25% until its acid value is 130.72g / L, then the concentrated solution is heated (heating temperature is 80~85 ℃) to carry out secondary concentration of about 25% to its acid value of 183.56g / L, and the solution is atomized and sprayed into the roasting furnace by the spray gun (wherein, The spray pressure is 0.35~0.50Mpa; the spray flow is 3~3.5m 3 / h), thermal decomposition occurs under a high-temperature oxidizing atmosphere at 750°C to generate hydrogen chloride gas and solid oxides. After spray roasting, the outlet temperature of hydrogen chloride gas is 450°C; the hydrogen chloride gas is absorbed by an abs...

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PUM

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Abstract

The invention belongs to the field of chemical industry, and in particular relates to a method for recovering and treating waste hydrochloric acid solution in the process of preparing rutile by hydrochloric acid method. The invention provides a method for recovering waste hydrochloric acid solution in the rutile process prepared by hydrochloric acid method, comprising the following steps: a, filtering the waste hydrochloric acid solution obtained after the washing process in the rutile process prepared by hydrochloric acid method to remove solid impurities, and then obtaining acid by pre-concentration Value is the waste hydrochloric acid solution of 120~150g / L; B, the waste hydrochloric acid solution that step a gained is concentrated again and obtains the waste hydrochloric acid solution that acid value is 160~200g / L; c, the acid value that step b gained is 160~200g / L The waste hydrochloric acid solution of L is thermally decomposed by spray roasting to obtain hydrogen chloride gas and solid iron oxide; wherein, the roasting temperature is 650-750°C. The method of the invention can effectively remove impurities, obtain relatively high-concentration regenerated hydrochloric acid and by-product iron oxide with good economic benefits.

Description

technical field [0001] The invention belongs to the field of chemical industry, and more specifically relates to a recovery and treatment method suitable for waste hydrochloric acid solution in the process of preparing rutile by hydrochloric acid method. Background technique [0002] In industrial production, in the process of leaching titanium concentrate with hydrochloric acid to prepare artificial rutile, artificial rutile must undergo processes such as titanium concentrate modification, leaching, filtering, washing, and calcination to obtain higher-grade artificial rutile. In the process of filtering and washing, the leaching mother liquor with higher concentration of total acid value can be obtained by directly filtering the slurry which has just been leached, and the recovery of this part of mother liquor is easy to handle. In the washing process, a part of impurity solutions with different concentrations of hydrochloric acid with lower content will be obtained. Becau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B7/01C01G49/06
Inventor 张兴勇
Owner PANGANG GRP MINING