阅读说明：本技术 一种盐石膏、盐泥固废无害化处理工艺 (Harmless treatment process for solid wastes of salt gypsum and salt mud ) 是由 梁五星 李新奇 史永飞 张俊飞 刘寅琴 梁飞飞 毕文锋 续增辉 马张彬 程功 王 于 2021-06-02 设计创作，主要内容包括：本发明公开了一种盐石膏、盐泥固废无害化处理工艺,属于盐石膏处理技术领域,本工艺可以系统地处理制盐厂产生的盐石膏和盐泥,通过加水搅拌,压榨除水等步骤,将原料盐石膏中的含盐量(以Cl-含量计算)降低到1.0％以下,水分含量25％左右,最大程度降低了对环境的影响,将盐石膏中的氯化钠含量大幅度降低,使得处理后的产生的石膏能得到合理的使用,在处理盐石膏和盐泥过程产生的石膏和卤水,增加了工厂的收入,提高了处理盐石膏和盐泥的积极性。(The invention discloses a harmless treatment process for solid wastes of salt gypsum and salt mud, which belongs to the technical field of salt gypsum treatment, can systematically treat the salt gypsum and the salt mud generated in a salt plant, reduces the salt content (calculated by Cl < - > content) in the raw material salt gypsum to below 1.0 percent and the water content to about 25 percent by adding water and stirring, squeezing to remove water and other steps, furthest reduces the influence on the environment, greatly reduces the sodium chloride content in the salt gypsum, ensures that the treated generated gypsum can be reasonably used, increases the income of the plant and improves the enthusiasm of treating the salt gypsum and the salt mud.)

1. A salt gypsum and salt mud solid waste harmless treatment process is characterized by comprising the following steps:

s1, putting the salt gypsum into a first stirring pool, and putting the salt mud into a second stirring pool and a third stirring pool;

s2, the water in the condensed water bucket enters a first stirring pool, and the salt gypsum and the water are stirred together;

s3, transferring the stirred salt gypsum slurry from the first stirring tank to a second presser;

s4, discharging the gypsum after filter pressing by a second presser, and enabling waste residues and waste liquid to enter a first thickener;

s5, transferring the concentrated waste liquid from the first thickener to the second thickener;

s6, transferring the precipitated salt mud into a third stirring tank from a second thickener:

s7, allowing the salt mud in the second stirring tank and the salt mud in the third stirring tank to enter a first filter press;

s8, discharging the gypsum after filter pressing by a first filter press, and feeding the waste residue and the waste liquid into a first thickener.

2. The harmless treatment process of solid wastes of salt gypsum and salt mud as claimed in claim 1, wherein the first filter press or the second press is cleaned by water in the condensed water tank after the gypsum after filter pressing is discharged from the first filter press or the second press in step S4.

3. The harmless treatment process of the solid wastes of the salt gypsum and the salt mud as claimed in claim 2, which is characterized in that: after the first squeezer is cleaned in the step S8, the first squeezer is cleaned for the second time by using water in a water bucket.

4. The harmless treatment process of the solid wastes of the salt gypsum and the salt mud as claimed in claim 1, which is characterized in that: and (5) the saline water discharged by the second thickener in the step (S6) enters a wastewater pool, and the saline water in the wastewater pool is used for mining brine from salt mines.

5. The harmless treatment process of the solid wastes of the salt gypsum and the salt mud as claimed in claim 1, which is characterized in that: the gypsum cake pressed in step S4 has a low salt content and can be used as a raw material for gypsum production.

Technical Field

The invention relates to the technical field of salt gypsum treatment, in particular to a harmless treatment process for solid wastes of salt gypsum and salt mud.

Background

At present, the salt gypsum produced by a salt factory can only be stacked in a centralized way, and the salt gypsum not only occupies valuable land resources, but also causes certain pollution to surrounding land, underground water and air for a long time.

The salt gypsum is waste residue generated in the salt manufacturing industry, and is difficult to reuse because of a large amount of sodium chloride contained in the waste residue, so how to efficiently clean and remove the sodium chloride in the salt gypsum to enable the salt gypsum to be reused is a problem which needs to be solved urgently.

Disclosure of Invention

The invention aims to solve the problem that salt gypsum is difficult to reuse in the prior art, and provides a solid waste harmless treatment process of salt gypsum and salt mud.

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

a harmless treatment process for solid wastes of salt gypsum and salt mud comprises the following steps:

s1, putting the salt gypsum into a first stirring pool, and putting the salt mud into a second stirring pool and a third stirring pool;

s2, the water in the condensed water bucket enters a first stirring pool, and the salt gypsum and the water are stirred together;

s3, transferring the stirred salt gypsum slurry from the first stirring tank to a second presser;

s4, discharging the gypsum after filter pressing by a second presser, and enabling waste residues and waste liquid to enter a first thickener;

s5, transferring the concentrated waste liquid from the first thickener to the second thickener;

s6, transferring the precipitated salt mud into a third stirring tank from a second thickener:

s7, allowing the salt mud in the second stirring tank and the salt mud in the third stirring tank to enter a first filter press;

s8, discharging the gypsum after filter pressing by a first filter press, and feeding the waste residue and the waste liquid into a first thickener.

Preferably, in step S4, after the filter-pressed gypsum is discharged from the first filter press or the second filter press, the first filter press or the second filter press is washed with water in the condensed water tank.

Preferably, after the first press is cleaned in step S8, the first press is cleaned again by using water in the water bucket.

Preferably, the salt-containing water discharged from the thickener II in the step S6 enters a waste water tank, and the salt-containing water in the waste water tank is used for mining brine from salt mines.

Preferably, the pressed gypsum cake in step S4 has a low salt content, and can be used as a raw material for gypsum production.

Compared with the prior art, the invention provides a harmless treatment process for solid wastes of salt gypsum and salt mud, and the beneficial effects of the invention are as follows: the process can systematically treat the salt gypsum and the salt mud generated in a salt plant, reduces the salt content (calculated by Cl < - > content) in the raw material salt gypsum to below 1.0 percent and the water content to about 25 percent by adding water and stirring, squeezing to remove water and the like, furthest reduces the influence on the environment, greatly reduces the sodium chloride content in the salt gypsum, ensures that the treated gypsum can be reasonably used, increases the income of the plant when treating the gypsum and the brine generated in the process of treating the salt gypsum and the salt mud, and improves the enthusiasm of treating the salt gypsum and the salt mud.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

Example 1

Referring to fig. 1, the present invention provides an embodiment: a harmless treatment process for solid wastes of salt gypsum and salt mud comprises the following steps:

s1, putting the salt gypsum into a first stirring pool, and putting the salt mud into a second stirring pool and a third stirring pool;

s2, the water in the condensed water bucket enters a first stirring pool, and the salt gypsum and the water are stirred together

Adding water to dilute the concentration of sodium chloride;

s3, transferring the stirred salt gypsum slurry from the first stirring tank to a second press

The press presses the gypsum into a gypsum cake, removes water by pressing, and reduces the salt content;

s4, discharging the gypsum after filter pressing by a second presser, and enabling waste residues and waste liquid to enter a first thickener;

s5, transferring the concentrated waste liquid from the first thickener to the second thickener;

s6, transferring the precipitated salt mud into a third stirring tank from a second thickener:

s7, allowing the salt mud in the second stirring tank and the salt mud in the third stirring tank to enter a first filter press;

s8, discharging the gypsum after filter pressing by a first filter press, and feeding the waste residue and the waste liquid into a first thickener.

In this embodiment, after the gypsum is discharged from the first filter press or the second filter press in step S4, the first filter press or the second filter press is cleaned with water in the condensate water tank, and after the gypsum is filter-pressed by the filter press, the inside deposits are cleaned with water, and the water carries the deposits to enter the thickener for solid-liquid separation.

In this embodiment, after the first squeezer is cleaned in step S8, the first squeezer is cleaned for the second time by using water in the water bucket, and the salt mud entering the first squeezer has strong adhesiveness, and is cleaned for the second time to remove the salt mud attached inside.

In this embodiment, the salt-containing water discharged from the second thickener in step S6 enters a wastewater tank, and the salt-containing water in the wastewater tank is used for mining brine from salt mines.

In this embodiment, the gypsum cake after pressing in step S4 has a low salt content, and can use the raw material for gypsum production, and the salt content in the gypsum cake after pressing is less than 1%.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.