CN102491472B

CN102491472B - Method for recovering sewage slag and preparing phosphate concentrate by using sewage slag

Info

Publication number: CN102491472B
Application number: CN 201110377222
Authority: CN
Inventors: 杨尚松; 赵定
Original assignee: Wengfu Group Co Ltd
Current assignee: Wengfu Group Co Ltd
Priority date: 2011-11-24
Filing date: 2011-11-24
Publication date: 2013-07-17
Anticipated expiration: 2031-11-24
Also published as: CN102491472A

Abstract

The invention discloses a method used for recovering sewage slag and preparing phosphate concentrate by using the sewage slag. The method comprises a two-stage treatment method. A first-stage treatment process comprises steps that: a certain amount of pool water is adopted, and lime cream is added to the pool water, such that the mixture is subject to a reaction; the mixture is fully stirred for 30min, and a pH value is controlled at 3-4; a flocculating agent PAM is added to the mixture, and the mixture is stood for 5-10min. A second-stage treatment process comprises steps that: lime cream is added to the pool water treated in the previous step, such that the pH value is regulated to 6-9; the flocculating agent PAM is added to the mixture, and the mixture is subject to a reaction for 20min; the mixture is then precipitated for 5-10min. Pool water slag obtained with the second-stage reaction can be used as phosphate concentrate. The process and operations of the method are simple. Only a two-stage treatment process is required. Only a small amount of added agent varieties are required. The treatment effect is good, the stability is good, and the cost is low.

Description

A kind of sewage slag reclaims the method for making the phosphorus concentrate

Technical field

The sewage slag that the present invention relates in the phosphate fertilizer industry is recycled the field, relates in particular to a kind of sewage slag and reclaims the method for making the phosphorus concentrate.

Background technology

Now in the treating processes of present high-density phosphorus, fluoric acid wastewater, adopt secondary lime acid-base neutralisation method more.And a large amount of sewage slag that will produce after the processing waste water, and the part addition material as phosphate fertilizer used after sewage slag can only adopt the slag dam heap to fill out or dry at present.

But these methods all do not have and can thoroughly use sewage slag, particularly contain a large amount of P in the slag ₂O ₅As resource, also all run off in vain.

Along with the raising of China to environmental protection requirement, and the principle of as far as possible recycling in line with resource; Simultaneously also in order to do recycling economy well, the target that turns waste into wealth.The contriver has drawn the novel method that a kind of pond grain slag is recycled to the reacted slag of present urn good fortune phosphate fertilizer plant's slag field waste water (being called for short Chi Shui down) by correlation test.

Summary of the invention

The purpose of this invention is to provide and a kind of sewage slag is reclaimed the method make the phosphorus concentrate, the reaction effect of making phosphoric acid of the sewage slag that uses this method acquisition is good, and can reach every index of relieving haperacidity.

Realize that technical scheme of the present invention is to utilize the phosphogypsum slag field Chi Shui of urn good fortune phosphate fertilizer plant to be object, develop the technical process of pond grain slag recycle, concrete water-quality guideline sees the following form:

Realize that technical scheme of the present invention comprises the second-stage treatment mode:

First order reaction is to get certain Chi Shui and add the milk of lime reaction, fully stirs 20min, and control pH value to 3 ~ 4 add flocculation agent PAM, leave standstill 5 ~ 10min, and this moment, precipitation increased, and water is limpid;

Second order reaction is regulated pH value to 6 ~ 9 for adding milk of lime at the Chi Shuizhong through above-mentioned processing, adds flocculation agent PAM reaction 20min, makes its precipitation 5 ~ 10min again, and the pond grain slag of gained second order reaction namely can be used as the phosphorus concentrate and uses.

Above-mentioned Chi Shui before use, the waste water that sulfuric acid wastewater containing, phosphoric acid recirculated water etc. is influenced phosphorus content carries out separating treatment.

Principle of the present invention is: in first order reaction, by pH value scope control, following in the prerequisite of removal F as much as possible reduces the P loss as far as possible; A large amount of P that remove in the water of pond improve the P in the grain slag of pond as far as possible in second order reaction ₂O ₅Content makes its index reach target with the mixed phosphoric acid of phosphorus concentrate; In addition, reduce medicament as far as possible and add, make its good stability, cost is low.

Advantage of the present invention: flow process and simple to operate only needs second-stage treatment, i.e. secondary reaction, secondary sedimentation; It is few to add medicament kind; Treatment effect is good, good stability, and cost is low.

Description of drawings

Fig. 1 is process flow sheet of the present invention.

Embodiment

Embodiment 1

Get Chi Shui 1000ml, add milk of lime reaction (mass percent is 5%) and fully stir 20min, continue to add milk of lime 110ml, control pH value to 3.71 adds PAM 3ml, leaves standstill 5min;

Get the clear liquid 500ml of pH value 3.71 respectively with two beakers, add milk of lime and regulate pH value to 6.32 and 8.99, and fully stir 20min, wherein the pH value is that 6.32 beakers add flocculation agent PAM 1ml, leaves standstill 10min; PH value 8.99 beakers add flocculation agent 2ml, leave standstill 10min.

Embodiment 2

1. get Chi Shui 500ml with two beakers respectively, and add the milk of lime stirring.

2. 1# sample: control one-level pH value is 3, adds milk of lime 260ml, behind the stirring 20min

Add 1ml PAM, and leave standstill 10min

3. 2# sample: control one-level pH value is 4, adds milk of lime 640ml, adds 1ml PAM behind the stirring 20min, and leaves standstill 10min

4. get 1#, each 200ml of 2# sample supernatant liquor with 2 beakers respectively, continue to add milk of lime, 1# sample control secondary pH value is 8.8; 2# sample control secondary pH value is 6.85, behind the stirring 20min, measures after leaving standstill 5min.

The one-level that produces after embodiment 1 and embodiment 2 reactions, the slag of secondary are filtered with funnel, after the slag process oven dry processing, respectively every group of slag specimen carried out P after filtering ₂O ₅Analyze, and with the phosphogypsum slag of first order reaction by equal in quality than mixing (being that the pH value is 3,3.71,4 o'clock slag), the phosphogypsum equal in quality of second order reaction is mixed (being that the pH value is 6.32,6.85,7.99,8.80 o'clock slag) than slag and is carried out assay determination, obtains a result.

First order reaction slag specimen: pH value 3 slag specimens: P ₂O ₅Content: 18.26%

PH value 3.71 slag specimens: P ₂O ₅Content: 27.54%

PH value 4 slag specimens: P ₂O ₅Content: 3.48%

Second order reaction slag specimen: pH value 6.32 slag specimens: P ₂O ₅Content: 39.03%

PH value 6.85 slag specimens: P ₂O ₅Content: 27.53%

PH value 7.99 slag specimens: P ₂O ₅Content: 33.05%

PH value 8.80 slag specimens: P ₂O ₅Content: 34.08%

One-level is mixed slag specimen: P ₂O ₅Content: 26.41%, F content: 16.92%

Secondary mixing slag specimen: P ₂O ₅Content: 33.38%, F content: 2.63%

Can draw P in the slag mixing slag specimen of secondary thus ₂O ₅: 33.38%, can satisfy the phosphorus concentrate to P ₂O ₅The requirement of content's index.

The phosphoric acid contrast processed of pond grain slag and phosphorus concentrate:

At first with secondary mixing slag specimen and phosphorus concentrate slurry by same ratio, under the identical water ratio situation, with the vitriol oil (98%) reaction of equal volume, the reaction times is 10min, constantly slowly stirs in the reaction; After reaction is finished reaction slurry is carried out the suction filtration test.Wherein the 1# sample adopts the pond grain slag, and the 2# sample adopts the phosphorus concentrate, and suction filtration liquid draws by mensuration:

1# suction filtration liquid: P ₂O ₅Content: 7%, F content: 0.1%

2# suction filtration liquid: P ₂O ₅Content: 3.89%, F content: 0.29%

Can find out that thus the reaction suction filtration liquid of sewage slag is better than the reacted filtrate of phosphorus concentrate, sewage slag all is better than or is equivalent to the level of phosphorus concentrate in the index of each side such as viscosity and crystallization simultaneously.

The feasible process of therefore, mixing back relieving haperacidity with sewage slag with the phosphorus concentrate.

Claims

1. a sewage slag reclaims the method for making the phosphorus concentrate, it is characterized in that it comprises the second-stage treatment mode:

First order reaction is to get certain Chi Shui and add the milk of lime reaction, fully stirs 20min, and control pH value to 3 ~ 4 add flocculation agent PAM, leave standstill 5 ~ 10min;

Second order reaction is regulated pH value to 6 ~ 9 for adding milk of lime at the Chi Shuizhong through above-mentioned processing, adds flocculation agent PAM reaction 20min, makes its precipitation 5 ~ 10min again, and the pond grain slag of gained second order reaction namely can be used as the phosphorus concentrate and uses;

The concrete water-quality guideline of described Chi Shui sees the following form:

。

2. sewage slag according to claim 1 reclaims the method for making the phosphorus concentrate, it is characterized in that described Chi Shui before use, and the waste water that sulfuric acid wastewater containing, phosphoric acid recirculated water etc. is influenced phosphorus content carries out separating treatment.