Method for preparing iron oxide red and hydrochloric acid from hot galvanized waste acid

A combined preparation technology of iron oxide red, which is applied in the field of industrial waste resource treatment, can solve the problems of complex process flow, large iron oxide particle size, and high production cost, and achieve simple process flow, short material reaction time, and fast reaction rate Effect

Inactive Publication Date: 2016-01-27
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this technological process can obtain iron oxide, the iron oxide particle si...

Method used

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  • Method for preparing iron oxide red and hydrochloric acid from hot galvanized waste acid
  • Method for preparing iron oxide red and hydrochloric acid from hot galvanized waste acid
  • Method for preparing iron oxide red and hydrochloric acid from hot galvanized waste acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] like figure 1 Shown, this hot-dip galvanizing waste acid is jointly prepared the method for iron oxide red and hydrochloric acid, and its concrete steps are as follows:

[0032] (1) First, hot-dip galvanizing waste acid (FeCl 2 40%, FeCl 3 0.1%, HCl0.2%, impurity content (calcium, magnesium, manganese salts, etc.) 0.05%, the balance is water) using an atomizer with an atomization rate of 0.25m 3 / h is sprayed into the microwave reaction chamber, and then the flow rate is 300m from the bottom of the microwave reaction chamber 3 / h of oxidizing gas (oxidizing gas is pure oxygen), pyrolysis at a temperature of 350°C for 10s to prepare iron oxide red particles and tail gas containing hydrochloric acid;

[0033] (2) The tail gas containing hydrochloric acid obtained in step (1) is dust-collected to recover iron oxide red particles, and the remaining tail gas is cooled and absorbed by water to obtain industrial hydrochloric acid, and the remaining tail gas after water abso...

Embodiment 2

[0036] like figure 1 Shown, this hot-dip galvanizing waste acid is jointly prepared the method for iron oxide red and hydrochloric acid, and its concrete steps are as follows:

[0037] (1) First, hot-dip galvanizing waste acid (FeCl 2 8%, FeCl 3 5%, HCl4%, impurity content (calcium, magnesium, manganese salts, etc.) 0.3%, the balance is water) using an atomizer with an atomization rate of 0.3m 3 / h is sprayed into the microwave reaction chamber, and then passed through the bottom of the microwave reaction chamber with a flow rate of 50m 3 / h of oxidizing gas (oxidizing gas is pure oxygen), pyrolyzed at 450°C for 8s to prepare iron oxide red particles and tail gas containing hydrochloric acid;

[0038] (2) The tail gas containing hydrochloric acid obtained in step (1) is dust-collected to recover iron oxide red particles, and the remaining tail gas is cooled and absorbed by water to obtain industrial hydrochloric acid, and the remaining tail gas after water absorption is pas...

Embodiment 3

[0041] like figure 1 Shown, this hot-dip galvanizing waste acid is jointly prepared the method for iron oxide red and hydrochloric acid, and its concrete steps are as follows:

[0042] (1) First, hot-dip galvanizing waste acid (FeCl 2 25%, FeCl 3 4%, HCl2%, impurity content (calcium, magnesium, manganese salts, etc.) 0.2%, the balance is water) using an atomizer with an atomization rate of 0.35m 3 / h sprayed into the microwave reaction chamber, and then passed through the bottom of the microwave reaction chamber with a flow rate of 100m 3 / h of oxidizing gas (oxidizing gas is pure oxygen), pyrolyzed for 6s at a temperature of 500°C to prepare iron oxide red particles and tail gas containing hydrochloric acid;

[0043](2) The tail gas containing hydrochloric acid obtained in step (1) is dust-collected to recover iron oxide red particles, and the remaining tail gas is cooled and absorbed by water to obtain industrial hydrochloric acid, and the remaining tail gas after water a...

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Abstract

The invention relates to a method for preparing iron oxide red and hydrochloric acid from hot galvanized waste acid and belongs to the technical field of resourceful treatment of industrial waste. Firstly, the hot galvanized waste acid is sprayed into a microwave reaction chamber through an atomizer at the atomization rate of 0.1-1.0 m<3>/h, then an oxidizing gas is introduced into the microwave reaction chamber from the bottom of the microwave reaction chamber at the flow rate of 50-300 m<3>/h and is pyrolyzed for 1-10 s at the temperature of 350 DEG C-850 DEG C, and iron oxide red particles and tail gas containing hydrochloric acid are prepared; the tail gas containing hydrochloric acid is subjected to dust collection, the iron oxide red particles are recovered, remaining tail gas is cooled and absorbed with water, industrial hydrochloric acid is obtained, and tail gas remaining after water absorption is absorbed by an alkaline solution and is exhausted after reaching an industrial waste gas exhaust standard. The method aims to solve the problem of difficulty in treatment of hot galvanized waste acid, and iron oxide red with high purity and small particle size is prepared.

Description

technical field [0001] The invention relates to a method for jointly preparing iron oxide red and hydrochloric acid with hot-dip galvanizing waste acid, and belongs to the technical field of industrial waste resource treatment. Background technique [0002] Iron oxide is often used as a colorant in construction, rubber, automobile and other industries, and it is usually produced by green vanadium calcination method and solution precipitation method in industry. The production of iron oxide by green vanadium forging yarn produces a large amount of smoke and dust, high power consumption, and serious environmental pollution. Especially now that the country has strict requirements on the environment, the process of pyrocalcination to produce zinc oxide is strictly restricted. The solution precipitation method usually uses ferrous chloride as raw material to produce iron oxide, including crystallization, oxidation, precipitation and other processes, with long reaction time and c...

Claims

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Application Information

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IPC IPC(8): C01G49/06C01B7/01
Inventor 李世伟陈伟恒张利波彭金辉尹少华谢峰周俊文郭胜惠常军
Owner KUNMING UNIV OF SCI & TECH
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