阅读说明：本技术 一种钢材废液回收工艺 (Steel waste liquid recovery process ) 是由 戴卫超 于 2019-09-27 设计创作，主要内容包括：本发明公开了一种钢材废液回收工艺,包括以下步骤：a、预处理I：酸性废液进入废液罐一,废液罐一用于放置待处理酸性废液,废液罐一与废液罐二2相连,废液罐二的侧壁设置有液位传感器；b、焙烧炉焙烧：通过焙烧炉500～600℃加热焙烧,进行固液分离,固体物质进行沉淀并收集于设于焙烧炉下方的固体收集器中；c、气固分离；d、吸附：将浓缩液通过树脂色谱柱进行吸附,收集流出液；吸附和解吸的流速均为0.006米/秒；e、解吸附：用水淋洗树脂色谱柱,收集流出液。本发明的钢材废液回收装置具备下述有益效果：能够实现盐酸废液的零排放,且本方法处理效果明显,系统操作运行稳定。(The invention discloses a steel waste liquid recovery process, which comprises the following steps: a. pretreatment I: the acidic waste liquid enters a first waste liquid tank, the first waste liquid tank is used for placing the acidic waste liquid to be treated, the first waste liquid tank is connected with a second waste liquid tank 2, and a liquid level sensor is arranged on the side wall of the second waste liquid tank; b. roasting in a roasting furnace: heating and roasting at 500-600 ℃ through a roasting furnace, carrying out solid-liquid separation, precipitating solid matters and collecting the solid matters in a solid collector arranged below the roasting furnace; c. gas-solid separation; d. adsorption: adsorbing the concentrated solution by a resin chromatographic column, and collecting effluent liquid; the flow rates of adsorption and desorption are both 0.006 m/s; e. desorption: the resin chromatographic column is rinsed with water and the effluent is collected. The steel waste liquid recovery device has the following beneficial effects: the method can realize zero emission of the hydrochloric acid waste liquid, and has obvious treatment effect and stable system operation.)

1. A steel waste liquid recovery process is characterized in that: the method comprises the following steps:

a. pretreatment I: the method comprises the following steps that acidic waste liquid enters a first waste liquid tank, the first waste liquid tank is used for containing acidic waste liquid to be treated, the first waste liquid tank is connected with a second waste liquid tank, a liquid level sensor is arranged on the side wall of the second waste liquid tank, an air inlet is formed in the top of the first waste liquid tank, a stirring device is arranged in the first waste liquid tank, the air inlet is connected with the stirring device, activated carbon is added for stirring treatment, and suspended impurities in the acidic waste liquid are removed, wherein the mass ratio of the activated carbon to the acidic waste liquid is 1: 20-500;

b. roasting in a roasting furnace: heating and roasting at 500-600 ℃ through a roasting furnace, carrying out solid-liquid separation, precipitating solid matters and collecting the solid matters in a solid collector arranged below the roasting furnace;

c. gas-solid separation: the steam passes through a cyclone separator, solid particles are separated from the steam, and the steam is cooled into concentrated solution in a concentrator;

d. adsorption: adsorbing the concentrated solution by a resin chromatographic column, and collecting effluent liquid;

e. desorption: the resin chromatographic column is rinsed with water and the effluent is collected.

2. The process for recovering a steel material waste liquid according to claim 1, characterized in that: the resin is at least one of strong base type anion exchange resin and strong acid type cation exchange resin with quaternary amine functional groups.

3. The process for recovering a steel material waste liquid according to claim 1, characterized in that: the volume ratio of the resin filling amount of the chromatographic column to the single treatment of the industrial waste acid is 1: 0.5 to 0.8.

4. The process for recovering a steel material waste liquid according to claim 1, characterized in that: the stirring device is a plurality of air pipes which are arranged in a bending way, and a plurality of air outlet holes are formed in the pipe walls of the air pipes.

5. The process for recovering a steel material waste liquid according to claim 1, characterized in that: the concentrator is connected with the absorption tower, from top to bottom is equipped with rinsing scrubbing layer, active carbon absorbed layer in proper order in this absorption tower, and the export of concentrator and the entry looks UNICOM of locating the absorption tower bottom.

6. The process for recovering a steel material waste liquid according to claim 1, characterized in that: the trend of industrial waste acid is from bottom to top during adsorption, the trend of water is from top to bottom during desorption, and the flow velocity of adsorption and desorption is 0.006-0.01 m/s.

7. The process for recovering a waste steel liquid according to claim 5, wherein: the thickness of the activated carbon absorption layer is 300-380 mm.

Technical Field

The invention relates to the technical field of pickling waste liquid recovery, in particular to a steel waste liquid recovery process.

Background

In the steel industry, rolled steel, metal products and the like need to be pickled to remove iron scales and other impurities on the surface of steel, and hydrochloric acid pickling is generally adopted. After acid washing, the steel surface is washed away with water in a rinsing tank. And after the iron ion concentration of the acid liquor in the pickling tank reaches a control value, discharging the waste acid liquor and replacing with new acid liquor. Therefore, the acid washing process has the discharge of waste hydrogen chloride gas, the discharge of acid waste water and the discharge of a large amount of waste acid. If the acid waste liquid is not treated and is discharged into a sewer or directly discharged to nearby receiving water, the residual acid can corrode cement, concrete and peripheral land and destroy the balance of calcium carbonate in the water, so that animals in the water die and are harmful to crops, and the waste liquid is directly discharged to seriously pollute the surrounding environment.

At present, the treatment methods for hydrochloric acid waste liquid in the metal processing industry at home and abroad mainly comprise an acid-base neutralization method, a hydrochloric acid regeneration method and an evaporative crystallization method. Acid-base neutralization method: lime, carbide slag or caustic soda are generally adopted to neutralize the waste water, so that the PH value reaches the national discharge standard and then is discharged. The disadvantages are high cost of neutralizing agent, high cost, limited waste acid treatment capacity, and HCL and FeCl in the waste pickle liquor₂And the like, and the gas generated in the treatment process diffuses, causes secondary pollution and is unfavorable for the environment.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the steel waste liquid recovery process is developed and developed, and the waste liquid is treated, so that the waste liquid can be effectively treated, and the environmental pollution is avoided.

In order to achieve the purpose, the invention adopts the following technical scheme:

a steel waste liquid recovery process comprises the following steps:

a. pretreatment I: the method comprises the following steps that acidic waste liquid enters a first waste liquid tank, the first waste liquid tank is used for containing acidic waste liquid to be treated, the first waste liquid tank is connected with a second waste liquid tank, a liquid level sensor is arranged on the side wall of the second waste liquid tank, an air inlet is formed in the top of the first waste liquid tank, a stirring device is arranged in the first waste liquid tank, the air inlet is connected with the stirring device, activated carbon is added for stirring treatment, and suspended impurities in the acidic waste liquid are removed, wherein the mass ratio of the activated carbon to the acidic waste liquid is 1: 20-500;

b. roasting in a roasting furnace: heating and roasting at 500-600 ℃ through a roasting furnace, carrying out solid-liquid separation, precipitating solid matters and collecting the solid matters in a solid collector arranged below the roasting furnace;

c. gas-solid separation: the steam passes through a cyclone separator, solid particles are separated from the steam, and the steam is cooled into concentrated solution in a concentrator;

d. adsorption: adsorbing the concentrated solution by a resin chromatographic column, and collecting effluent liquid;

e. desorption: the resin chromatographic column is rinsed with water and the effluent is collected.

As a further improvement, the resin is at least one of strong base type anion exchange resin and strong acid type cation exchange resin with quaternary amine functional groups.

As a further improvement, the volume ratio of the resin filling amount of the chromatographic column to the single-treatment industrial waste acid is 1: 0.5 to 0.8.

As a further improvement, the stirring device is a plurality of air pipes which are arranged in a bending way, and a plurality of air outlets are formed in the pipe walls of the air pipes.

As a further improvement, the concentrator is connected with an absorption tower, a rinsing washing layer and an active carbon absorption layer are sequentially arranged in the absorption tower from top to bottom, and an outlet of the concentrator is communicated with an inlet arranged at the bottom of the absorption tower.

As a further improvement, the industrial waste acid flows downwards and upwards in and out during adsorption, the water flows upwards and downwards in and out during desorption, and the flow velocity of adsorption and desorption is 0.006-0.01 m/s.

As a further improvement, the thickness of the activated carbon absorption layer is 300-380 mm.

The steel waste liquid recovery process has the following beneficial effects:

1) according to the steel waste liquid recovery device, through mutual matching of the steps, the stirring device is arranged in the waste liquid tank II, primary stirring of the waste liquid is fully realized through bubbles, the step can enable the activated carbon to be in full contact with the waste liquid, the color of the finally collected concentrated liquid is yellowish, the free calculation recovery rate is up to 82%, and the chroma removal rate is 87%;

2) the high-temperature operation in the baking furnace enables gas to leave from the top of the baking furnace and enter the cyclone separator, the cyclone separator separates solid particles (namely iron oxide particles) carried in the gas, the separated solid particles (namely iron oxide particles) are discharged back to the baking furnace through the second rotary valve, and the rest gas directly enters the preconcentrator;

3) the operation steps of the method can realize zero discharge of the hydrochloric acid waste liquid by treating the waste acid, and the method has obvious treatment effect, can continuously and stably produce, adopts anticorrosive materials for equipment and the like, is durable in corrosion prevention, and is stable in system operation.

4) Can avoid the secondary pollution of industrial waste acid to the environment.

Drawings

FIG. 1 is a schematic structural view of a steel waste liquid recovery process apparatus according to the present invention.

Fig. 2 is a schematic structural view of comparative example 1.

In the figure, 1-a first waste liquid tank, 2-a second waste liquid tank, 21-an upper cover, 3-a roasting furnace, 4-a solid collector, 5-a concentrator, 6-an absorption tower, 61-a rinsing and washing layer and 62-an active carbon absorption layer.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clear, the present invention is further described with reference to the following embodiments: