Method for preparing iron oxide and ammonium sulfate by using hydrochloric acid washing waste liquid

Abstract

The invention relates to a method for preparing iron oxide and ammonium sulfate by using a hydrochloric acid washing waste liquid, wherein an iron and steel element is subjected to acid washing treatment by using a hydrochloric acid solution as an acid washing liquid to remove surface oxides so as to obtain an iron-containing hydrochloric acid washing waste liquid, and the iron-containing hydrochloric acid washing waste liquid is used as the raw material of the method. The method comprises: (1) solid-liquid separation; (2) preheating and heating; (3) mixed displacement; (4) flash evaporation;(5) evaporation crystallization; (6) solid-liquid separation (7) mixed dissolution; (8) pH value adjustment; (9) adsorption and impurity removal; (10) solid-liquid separation; (11) neutralization oxidation; and (12) solid-liquid separation, wherein the liquid phase material is further prepared into the sulfuric acid product, the solid phase material is further prepared into the iron oxide products, and an ammonium sulfate by-product can be prepared during the preparation of an ammonium sulfate product. According to the present invention, the method has characteristics of reasonable process, simple method, environmental protection, energy saving, low preparation cost, good product quality and high utilization rate of valuable components.

Description

technical field

[0001] The invention relates to a method for preparing iron oxide and ammonium sulfate from hydrochloric acid pickling waste liquid, which uses hydrochloric acid solution as pickling liquid to pickle iron and steel components to remove iron-containing hydrochloric acid waste pickling liquid obtained in the process of removing surface oxides The method for preparing ferric oxide and ammonium sulfate by resource comprehensive utilization as raw materials belongs to the field of environmental chemical industry. Background technique

[0002] Iron oxide is a hexagonal crystal system with a molecular formula of α-Fe 2 o 3 , has the characteristics of non-toxic, alkali resistance, heat resistance, etc., the decomposition temperature is 1560 ℃, it is light reddish brown, it turns gray black when it is burned strongly, but it turns red again when it is ground into powder. Iron oxide is widely used in building materials, paints, coatings, papermaking, rubber, ceramic...

Examples

Embodiment 1

[0066] The main process equipment is static mixer, indirect heat exchanger, decompression flash evaporation equipment, mixing and dissolving equipment, neutralization oxidation reaction equipment, oxidation impurity removal reaction equipment, heat pump evaporation crystallization equipment, filter type solid-liquid separation device, blade type Solid-liquid separation device, dehydration drying equipment, etc.

[0067] A method for preparing iron oxide and ammonium sulfate from hydrochloric acid pickling waste liquid, using hydrochloric acid solution as the pickling liquid to carry out pickling treatment on iron and steel components to remove iron-containing hydrochloric acid pickling waste liquid obtained in the process of removing surface oxides as raw materials, Carry out the method for resource utilization comprehensive utilization preparation iron oxide and ammonium sulfate, described method step is as follows:

[0068] (1) Solid-liquid separation: 1m 3 Contains 160Kg f...

technical field

[0001] The invention relates to a method for preparing iron oxide and ammonium sulfate from hydrochloric acid pickling waste liquid, which uses hydrochloric acid solution as pickling liquid to pickle iron and steel components to remove iron-containing hydrochloric acid waste pickling liquid obtained in the process of removing surface oxides The method for preparing ferric oxide and ammonium sulfate by resource comprehensive utilization as raw materials belongs to the field of environmental chemical industry. Background technique

[0002] Iron oxide is a hexagonal crystal system with a molecular formula of α-Fe 2 o 3 , has the characteristics of non-toxic, alkali resistance, heat resistance, etc., the decomposition temperature is 1560 ℃, it is light reddish brown, it turns gray black when it is burned strongly, but it turns red again when it is ground into powder. Iron oxide is widely used in building materials, paints, coatings, papermaking, rubber, ceramic...

Examples

Embodiment 1

[0066] The main process equipment is static mixer, indirect heat exchanger, decompression flash evaporation equipment, mixing and dissolving equipment, neutralization oxidation reaction equipment, oxidation impurity removal reaction equipment, heat pump evaporation crystallization equipment, filter type solid-liquid separation device, blade type Solid-liquid separation device, dehydration drying equipment, etc.

[0067] A method for preparing iron oxide and ammonium sulfate from hydrochloric acid pickling waste liquid, using hydrochloric acid solution as the pickling liquid to carry out pickling treatment on iron and steel components to remove iron-containing hydrochloric acid pickling waste liquid obtained in the process of removing surface oxides as raw materials, Carry out the method for resource utilization comprehensive utilization preparation iron oxide and ammonium sulfate, described method step is as follows:

[0068] (1) Solid-liquid separation: 1m 3 Contains 160Kg f...