CN204999808U - Preceding pretreatment systems of sediment is arranged to phosphate fertilizer plant's ardealite - Google Patents

Abstract

This application belongs to the ardealite and uses multipurposely technical field, and one kind concretely relates to is to the produced pretreatment systems of ardealite before row sediment of phosphate fertilizer plant's phosphoric acid by wet process technology. This system includes first conveyer, mixes machine, storage tank, metering device, second conveyer, wherein mixed built -in is sent the ardealite into to first conveyer, mix seat in the plane in storage tank below, metering device links to each other with the storage tank, it is that the ardealite transports to the windrow place through the second conveyer to mix the mixed back material of machine, the storage tank is used for depositing treatment material in advance. The ardealite development that this application had just been produced in to phosphorus fertilizer manufacturing enterprise assembly line among the prior art is used, simultaneously through to ardealite screening, the improvement of treatment material prescription in advance, neutralization that can be better, moisture and the harmful components such as soluble phosphorus, soluble fluorine in the solidification ardealite to to the environmental impact in the reduction ardealite banking process, it worth to have better production application.

Description

Pretreatment system before a kind of phosphate fertilizer plant phosphogypsum deslagging

Technical field

The application belongs to phosphogypsum technical field of comprehensive utilization, is specifically related to a kind of pretreatment system of phosphogypsum before deslagging produced for phosphate fertilizer plant's Wet Processes of Phosphoric Acid.

Background technology

Phosphogypsum is the solid waste of Phosphate Fertilizer Industry, and phosphoric acid is the basis of Phosphate Fertilizer Industry.Wet method phosphoric acid manufacture process is the phosphoric acid production technique commonly used the most.In wet method phosphoric acid manufacture process, first produce extraction slip by sulfuric acid decomposition ground phosphate rock, then filtration washing obtains phosphoric acid, and just can produce phosphogypsum waste in the process of filtration washing.General often production 1 ton of phosphoric acid about produces 5 ~ 6 tons of phosphogypsums, often produces 1 ton of diammonium phosphate and then can discharge 2.5 ~ 5 tons of phosphogypsums.Along with the fast development of China's high-concentration compound fertilizer industry in recent years, added up to by phosphate fertilizer class chemical enterprise and other enterprise (as composite additive) every year and be about more than 2,000 ten thousand tons.Because the impurity such as Leaching Properties of Soluble Phosphorus, fluorine, organism in phosphogypsum are huge for environmental hazard, add that phosphogypsum comprehensive utilization ratio is lower, thus problem of environmental pollution in phosphogypsum stacking process is badly in need of being studied.

In prior art, production of phosphate fertilizer enterprise be generally by phosphogypsum slip after solid-liquid separation, directly be transported to stockyard to stack, lack pretreatment technology or carry out pre-treatment again in stockyard, this case part causes process easy contaminate environment not in time, also result in a large amount of material resources, financial resources waste, thus be badly in need of a kind of phosphogypsum for production of phosphate fertilizer enterprise of exploitation produce after can carry out pretreated appliance arrangement and pretreatment technology in time, thus reduce for environment contaminative and be convenient to follow-up exploitation.

Summary of the invention

Directly phosphogypsum is stacked naturally the drawback of very easily contaminate environment for production of phosphate fertilizer enterprise in prior art, the application's main purpose is to provide a kind of phosphogypsum just produced for production of phosphate fertilizer enterprise to carry out pretreated pretreatment system and utilize the Pretreatment Technology of Phosphogypsum of this pretreatment system, thus reduces the contaminative for environment.

Below the detailed technology scheme of the application is described below.

Pretreatment system before a kind of phosphate fertilizer plant phosphogypsum deslagging, this system be applied to process Wet Processes of Phosphoric Acid in phosphogypsum slip after filter solid-liquid separation produce phosphogypsum, this system comprises storage tank, is positioned at the measuring apparatus be connected below storage tank and with storage tank and the first transfer roller, mixing machine and the second conveyor that are connected in turn, and described mixing machine is positioned at below measuring apparatus;

Wherein, phosphogypsum is sent in mixing machine by the first transfer roller; In mixing machine, mixed material is transported to windrow place through second conveyor;

Described storage tank is used for depositing pretreated material, and described measuring apparatus is for controlling the material given off in storage tank.

Pretreatment system before described phosphate fertilizer plant phosphogypsum deslagging, the wherein preferred horizontal stainless steel double helical ribbon mixer of mixing machine, can comparatively even by mixing of materials.

Utilize the phosphogypsum pretreatment process of pretreatment system before described phosphate fertilizer plant phosphogypsum deslagging, comprise the following steps:

(1) phosphogypsum is detected, determine main harmful substance contents, such as pH value, Leaching Properties of Soluble Phosphorus, soluble fluorine content data in phosphogypsum;

(2) select suitable pretreated material, described pretreated material is the mixture of red mud, alkali-activator, flyash and/or active slag, and described alkali-activator is sodium carbonate, cement or grey calcium;

Count in mass ratio, be specially:

Pretreated material is red mud, alkali-activator and mixture of fly ash, wherein red mud 35 ~ 55%, alkali-activator 10 ~ 20%, flyash 30 ~ 45%; Concrete example as:

Chi Ni ︰ Hui Gai ︰ flyash=40% ︰ 20% ︰ 40%(2 ︰ 1 ︰ 2);

Chi Ni ︰ Shui Ni ︰ flyash=40% ︰ 20% ︰ 40%(2 ︰ 1 ︰ 2);

Chi Ni ︰ Tan Suan Na ︰ flyash=40% ︰ 20% ︰ 40%(2 ︰ 1 ︰ 2);

Chi Ni ︰ Tan Suan Na ︰ flyash=35% ︰ 20% ︰ 45%;

Chi Ni ︰ Shui Ni ︰ flyash=55% ︰ 15% ︰ 30%;

Chi Ni ︰ Hui Gai ︰ flyash=45% ︰ 10% ︰ 45%;

Pretreated material is red mud, alkali-activator, flyash and active slag mixture, wherein red mud 25 ~ 55%, alkali-activator 10 ~ 20%, and flyash and active slag mix in any proportion and be filled to 100%; Concrete example as:

Chi Ni ︰ Tan Suan Na ︰ Fen Mei Hui ︰ active slag=40% ︰ 16% ︰ 40% ︰ 4%(2 ︰ 0.8 ︰ 2 ︰ 0.2);

Chi Ni ︰ Shui Ni ︰ Fen Mei Hui ︰ active slag=40% ︰ 10% ︰ 40% ︰ 10%(2 ︰ 0.5 ︰ 2 ︰ 0.5);

Chi Ni ︰ Hui Gai ︰ Fen Mei Hui ︰ active slag=25% ︰ 10% ︰ 50% ︰ 15%;

Chi Ni ︰ Shui Ni ︰ Fen Mei Hui ︰ active slag=55% ︰ 10% ︰ 15% ︰ 20%;

Chi Ni ︰ Tan Suan Na ︰ Fen Mei Hui ︰ active slag=30% ︰ 20% ︰ 25% ︰ 25%;

Pretreated material is red mud, alkali-activator and active slag mixture, wherein red mud 25 ~ 55%, alkali-activator 10 ~ 20%, and active slag adds to 100%; Concrete example as:

Chi Ni ︰ Shui Ni ︰ active slag=40% ︰ 20% ︰ 40%(2 ︰ 1 ︰ 2);

Chi Ni ︰ Shui Ni ︰ active slag=25% ︰ 20% ︰ 55%;

Chi Ni ︰ Tan Suan Na ︰ active slag=55% ︰ 20% ︰ 25%;

Chi Ni ︰ Hui Gai ︰ active slag=40% ︰ 10% ︰ 50%;

(3) pretreated material in step (2) is added storage tank, after mixing with phosphogypsum in proportion, windrow can row relax or directly use again after the ageing of 7d nature.

Pretreated material described in step (2) adds according to 1 ~ 5% of phosphogypsum quality.

There are some researches show, phosphogypsum main component is terra alba (CaSO ₄2H ₂o), its content generally can reach about 70 ~ 90%, and wherein contained submember is different and different with the Rock Phosphate (72Min BPL) place of production, and composition is comparatively complicated, generally all contains rock composition Ca, the phosphoric acid salt of Mg and silicate.In phosphogypsum, principal pollutant are soluble components wherein, wherein again based on the thing such as titanium pigment, soluble fluoride.In prior art, for reducing the pollution of phosphogypsum for environment, processing mode for phosphogypsum mainly contains neutralisation, WATER-WASHING METHOD, burning method etc., but various method is all study for existing windrow, because the existing windrow scale of construction is larger, easily more than ten thousand tons, thus all there is the higher difficult problem of the processing cost such as material resources, financial resources in existing method.

The application, for the phosphogypsum just produced in production of phosphate fertilizer enterprise streamline in prior art, provides a kind of pretreatment system, this system can with original production line better with the use of, realize automatic operating; Simultaneously the present invention, by the screening to phosphogypsum pretreated material formula, improvement, can neutralize preferably, solidify moisture in phosphogypsum and the objectionable constituent such as titanium pigment, soluble fluoride, thus reduce in phosphogypsum banking process for environmental influence; Meanwhile, because namely phosphogypsum has carried out pre-treatment in source of generation, thus can reduce follow-up phosphogypsum process intensity, the process required human and material resources such as place, investment, financial resources expense, thus there is good production application and be worth.

Accompanying drawing explanation

Pretreatment system structural representation before phosphate fertilizer plant's phosphogypsum deslagging that Fig. 1 provides for the application;

Fig. 2 is storage tank structural representation in pretreatment system before phosphate fertilizer plant's phosphogypsum deslagging.

Embodiment

Below in conjunction with drawings and Examples, explanation is further explained to the application.

embodiment 1

The application provides pretreatment system before phosphate fertilizer plant's phosphogypsum deslagging, to be mainly used in Wet Processes of Phosphoric Acid phosphogypsum slip after filter 1 solid-liquid separation produce phosphogypsum, as shown in Figure 1, 2, this system comprises the first transfer roller 2, mixing machine 5, storage tank 3, measuring apparatus 4, second conveyor 6;

Wherein phosphogypsum is sent in mixing machine 5 by the first transfer roller 2; Mixing machine 5 is positioned at below storage tank 3; Measuring apparatus 4 is connected with storage tank 3, for controlling the material given off in storage tank 3; Mixing machine 5 mixes rear material and phosphogypsum is transported to windrow place through second conveyor 6;

Described storage tank 3 is for depositing pretreated material.

Pretreatment system before described phosphate fertilizer plant phosphogypsum deslagging, wherein mixing machine 5 is horizontal stainless steel double helical ribbon mixer, can comparatively even by mixing of materials.

embodiment 2 ~ 7

Utilize the phosphogypsum pretreatment process of pretreatment system before phosphate fertilizer plant's phosphogypsum deslagging described in embodiment 1, comprise the following steps:

(1) phosphogypsum is detected, determine main harmful substance contents, such as pH value, Leaching Properties of Soluble Phosphorus, soluble fluorine content data in phosphogypsum.

In embodiment, phosphogypsum derives from Fei Ye company limited of Jiyuan Toyota stockyard, as shown in the table to the concrete detected result of its composition.

(2) select suitable pretreated material, count in mass ratio, each embodiment concrete pretreated material used is:

Embodiment 2, Chi Ni ︰ Hui Gai ︰ flyash=40% ︰ 20% ︰ 40%(2 ︰ 1 ︰ 2);

Embodiment 3, Chi Ni ︰ Shui Ni ︰ flyash=40% ︰ 20% ︰ 40%(2 ︰ 1 ︰ 2);

Embodiment 4, Chi Ni ︰ Tan Suan Na ︰ Fen Mei Hui ︰ active slag=40% ︰ 16% ︰ 40% ︰ 4%(2 ︰ 0.8 ︰ 2 ︰ 0.2);

Embodiment 5, Chi Ni ︰ Shui Ni ︰ Fen Mei Hui ︰ active slag=40% ︰ 10% ︰ 40% ︰ 10%(2 ︰ 0.5 ︰ 2 ︰ 0.5);

Embodiment 6, Chi Ni ︰ Tan Suan Na ︰ flyash=40% ︰ 20% ︰ 40%(2 ︰ 1 ︰ 2);

Embodiment 7, Chi Ni ︰ Shui Ni ︰ active slag=40% ︰ 20% ︰ 40%(2 ︰ 1 ︰ 2).

Not add pretreated material as blank.

In each embodiment, red mud used comes from Chalco Henan branch office, and composition is as shown in the table.

In each embodiment, active slag used comes from Jiyuan Iron And Steel Company, and composition is as shown in the table.

In each embodiment, flyash used comes from Jiyuan Qin Bei electricity Chang, and composition is as shown in the table.

In each embodiment, sodium carbonate used comes from Asia-Pacific, Langfang Long Xing chemical company, and composition is as shown in the table.

In each embodiment, cement used comes from the long aluminium cement mill of Chalco, and composition is as shown in the table.

(3) pretreated material in step (2) is added storage tank, after mixing with phosphogypsum in proportion, windrow can row relax or directly use again after the ageing of 7d nature;

In step (2), pretreated material all adds according to phosphogypsum quality 1%.

After piling old 7d, point to detect being divided in the middle part of each group of phosphogypsum, detect according to " GBT23456-2009 phosphogypsum " during detection, involved key instrument equipment has: constant temperature blast drying oven (Tianjin Stettlen), PH meter (Shanghai is accurate), spectrophotometer (Pu, Shanghai unit 400-700nm scope), flame photometer (upper Nereid section) etc., concrete detected result is as shown in the table.

As can be seen from the above table, no matter adopt which kind of pretreated material formula, compared to blank, i.e. untreated phosphogypsum, its pH of phosphogypsum, water-soluble fluorine, water-soluble Vanadium Pentoxide in FLAKES all show obvious reduction after pretreatment, the contaminative for environment can be reduced preferably, thus there is good application value.

Claims (2)

1. pretreatment system before phosphate fertilizer plant's phosphogypsum deslagging, it is characterized in that, this system be applied to process Wet Processes of Phosphoric Acid in phosphogypsum slip after filter solid-liquid separation produce phosphogypsum, this system comprises storage tank, is positioned at the measuring apparatus be connected below storage tank and with storage tank and the first transfer roller, mixing machine and the second conveyor that are connected in turn, and described mixing machine is positioned at below measuring apparatus;

Wherein, phosphogypsum is sent in mixing machine by the first transfer roller; In mixing machine, mixed material is transported to windrow place through second conveyor;

Described storage tank is used for depositing pretreated material, and described measuring apparatus is for controlling the material given off in storage tank.

2. pretreatment system before phosphate fertilizer plant's phosphogypsum deslagging as claimed in claim 1, it is characterized in that, described mixing machine is horizontal double helical ribbon mixer.