Polyaluminum ferrous chloride purifier and production method thereof

Abstract

The invention provides a polyaluminum ferrous chloride purifier and a production method thereof. The production method using the following raw materials includes the steps of firstly, feeding technical hydrochloric acid and aluminum sludge into a sealed reaction vessel, and stirring at normal temperature and pressure; secondly, adding CaCl2 to the solution obtained by the first step, stirring at normal temperature and pressure until complete reaction, and filtering to remove sedimentation; thirdly, adding steel acid pickling waste liquor into the solution obtained after filtering of the second step, and well mixing by stirring; fourthly, adding oxidant to the solution obtained by the third step; fifthly, adding calcium aluminate powder to the solution obtained by the fourth step, allowing for reaction, and filtering and aging to obtain the polyaluminum ferrous chloride purifier. The production method has the advantages that CaCl2 is added to control contents of SO42- in the product so as to prevent SO42- from reacting with the subsequently added calcium aluminate powder, and product stability is increased.

Description

technical field [0001] The invention belongs to the field of water purifying agents, and in particular relates to a polyaluminum ferric chloride water purifying agent and a manufacturing method thereof. Background technique [0002] In the surface treatment process of the steel industry and aluminum profile processing industry, in order to improve the performance of the steel and aluminum profile surfaces, it is often necessary to use inorganic acid for corrosion treatment to remove surface oxides. The surface pickling process will produce a large amount of iron-containing pickling waste liquid and aluminum-containing waste residue. These industrial wastes cannot be reused by the steel and aluminum profile enterprises themselves. If they are not effectively disposed of, they will become secondary pollution sources. Serious damage to the ecological environment. How to effectively dispose and utilize pickling waste liquid and aluminum sludge has always been an urgent problem ...

AI Technical Summary

Problems solved by technology

[0004] At present, there are many patents and literature reports on using pickling waste liquid and aluminum sludge to prepare liquid polyaluminum iron chloride water purifier, such as patent CN103043759A using pickling waste liquid and aluminum raw materials, using oxidative acid dissolution, and adding NaOH to adjust alkali Polymerization to prepare water purifier, but NaOH is too alkaline, it is easy to form precipitation with aluminum and iron ions during the dosing process, and the product has a low basicity, which affects the flocculation effect

Patent CN102774889A uses alkali slag, hydrochloric acid, iron salt, oxidant, and calcium aluminate powder as raw materials to prepare polyaluminium ferric chloride, without considering that the alkali slag contains a large amount of SO 4 2- Ca in calcium aluminate powder 2+ The disadvantage of forming a large amount of precipitation leads to unstable product and easy stratification, which ultimately affects the flocculation performance of the product. At the same time, a large amount of precipitation during the reaction process may even cause the material in the reaction tank to gel, making it impossible to complete the water purification agent polymerization preparation process

Patent CN1948156A uses aluminum mud, hydrochloric acid, and calcium aluminate powder to produce polyaluminum chloride, and does not consider SO in aluminum mud. 4 2- Influence on production process and product performance