CN1121360C

CN1121360C - Production process of inorganic composite fertilizer with SO2 absorbing sludge

Info

Publication number: CN1121360C
Application number: CN 00125371
Authority: CN
Inventors: 史汉祥
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-09-21
Filing date: 2000-09-21
Publication date: 2003-09-17
Anticipated expiration: 2020-09-21
Also published as: CN1284488A

Abstract

The present invention relates to the technical field of a method for producing inorganic compound fertilizers, which aims to change waste into valuable and avoid secondary pollution. Slag generated in the reaction of sulfur dioxide and furnace slag finely ground reacts with gypsum in a precipitation tank, and then, products are filtered, dehydrated and dried to obtain powdery fertilizers. The method of the present invention has the advantages of simplicity and little equipment investment and achieves the purpose of changing waste into valuable. The method of the present invention is suitable for being popularized and used in production in metal production plants.

Description

With inhaling SO 2The after product slag is made the production method of inorganic composite fertilizer

Technical field

The present invention relates to inorganic compounding fertilizer manufacturing method technical field.

Background technology

The applicant absorbs SO in the flue gas with slag ₂Its technical process is referring to Fig. 2, produce the new product slag that is equivalent to 1.4 times of Shanghai slag consumptions, this part product slag is not as being used, certainly will cause new environmental pollution, be extensive use of composite fertilizer on the opposite domestic agricultural and mostly be binary, Nitrogen, Phosphorus and Potassium greatly, and the using of these composite fertilizers, really for the moment can make high crop yield, but secular soil ploughing and weeding, only increase nitrogen, phosphorus, potassium, that soil is produced is serious rich long-pending, makes soil seriously lack a large amount of trace elements in other simultaneously, will cause that soil nutrient is bad.Therefore to fundamentally improve the nutritive element of crop, must improve the arable land situation, replenish the soil inorganic nutritive element, use novel inorganic composite fertilizer, making ploughs re-enters new vitality, makes crops quality nutritious, make human farm crop obtain more nutrition, become to look more luxuriant.

Summary of the invention

Technical problem to be solved by this invention provides a kind of slag that can solve and absorbs SO ₂The product slag utilizes again afterwards, and it is turned waste into wealth, and has both avoided secondary pollution, the usefulness suction SO that increases income for increasing crop yield again and improve the soil ₂The after product slag is made the production method of inorganic composite fertilizer.

Technical scheme of the present invention is achieved in that this kind is with inhaling SO ₂The after product slag is made the production method of inorganic composite fertilizer, it is characterized in that steps in sequence is: (1) is abandoned slag with non-ferrous metals smelting works and is clayed into power, add entry then and in the slip tempering tank, be made into slurries, wherein above-mentioned slag powder particle size is at the 100-250 order, slurry water and slag weight ratio 2-20: 1; (2) with pump with slurries squeeze in the absorption tower with tower in sulfur dioxide flue gas react; (3) bottom, the absorption tower product that comes out overflows to circulation groove, for recycle, question response fully after, a part is transported in the precipitate and separate pond; (4) add gypsum in the precipitate and separate pond, gypsum and slag part by weight are 0.02～0.08: 1, after waiting to precipitate clarification, clear liquor is returned slag slip tempering tank recycle for absorbing dioxide flow; (5) throw out is delivered on the filter dewatered; (6) with the oven dry of product slag, make powder fertilizer.

Above-mentioned throw out can add granulation behind the water glass additive through delivering to pelletizer after the filter dehydration, and drying is made granulated fertilizer again.

Experiment shows to absorb SO ₂After the product slag be that to make novel inorganic composite fertilizer be practicable to main raw material, its technology is simple, facility investment is few, quality is better than any in the market compound manure, be that factory has increased income when avoiding secondary pollution, obtain good economic benefit and social benefit, reach the purpose that turns waste into wealth, the feature of novel inorganic compound manure and major ingredient are its aqueous ph value 5-6, moisture about 5-8%, color is light yellow or faint yellow, powdery or particle, it is 20.4% that its composition contains total Si, and effective ingredient is 7.7%; Containing total iron is 19.29%, and effective ingredient is 4.5%; Contain total magnesium 1.45%, effective ingredient 0.7%; Containing total calcium is 13.67%, effective ingredient 4.3%; Always contain and dredge 9.1%, effective ingredient 5.5%; Contain zinc 0.15% in other composition, leaded 0.0025%, contain cadmium 0.0001%, cupric 0.13% contains chromium 0.012%, no arsenic, mercury, nickel.

The cost of novel inorganic compound manure and yield increase effect table:

Kind	Fertilizing method	Rate of fertilizer application (Kg/ mu)	Cost (unit)	Effect
Kind	Fertilizing method	Rate of fertilizer application (Kg/ mu)	Cost (unit)	Effect	Corn	Base manure	170	45	Volume increase 10%, mealie is full sturdy
Topdress	130					Base manure	170
Topdress	130	Soybean	Base manure	250		52.5	Volume increase 20%, root is luxuriant
Topdress	100		Base manure	250
Topdress	100		Potato	Base manure	260			39	Volume increase 15%, potato is sturdy
Paddy rice	Topdress	140	Potato	Base manure	260	21	Volume increase 10%, the tall and big green green grass or young crops of plant	39	Volume increase 15%, potato is sturdy

Above data show, are the novel inorganic composite fertilizer that main raw material is made with the product slag, and any plant is all had positive effect.Its fertilizer not only can increase production, and the sturdy content of fruit is abundant, and its fertilizer efficiency is considerably beyond present domestic various compound manure.Applied widely, cost is low, from its composition, especially high-load sulphur, iron, silicon, to Cruciferae, leguminous crop, green onion, garlic, leek, jowar, paddy rice etc. are responsive especially.So long-term application, it not only guarantees agricultural production and income, and can reach the purpose of improving the soil surely.

Produce 1080000 tons of product slag meters per year from this enterprise,, not only can reduce 500 mu in slag place, also increase by 9,000,000 yuans of annual incomes (in 150 yuan/ton) for enterprise as it is all made inorganic composite fertilizer.

Description of drawings

Fig. 1. the present invention makes the production method process flow sheet of novel inorganic composite fertilizer.

Fig. 2. slag absorbs the sulfur dioxide flue gas process flow sheet;

Embodiment

Below in conjunction with description of drawings embodiments of the invention are further described.

Embodiment: as shown in the figure, adopt ball mill that non-ferrous metals smelting works are abandoned the powder that slag grinds to form 200 order sizes earlier, add entry then and in the slip tempering tank, be made into slag inclusion 25% weight basis slurries, with the slag stock pump slurries are squeezed in the spray column and to be contacted with sulfur in smoke in the tower, fully reaction, control reaction temperature is 40-120 ℃ of scope, reaction process Zhong Ta lower section product overflows to circulation groove, for recycle, after the processing of two-stage tandem absorption spray column, a part that reacts completely is transported in the precipitate and separate pond, precipitate and separate adds industrial gypsum in the pond, and gypsum and slag part by weight are 0.05: 1, after waiting to precipitate clarification, clear liquor is returned the slip tempering tank for recycle, throw out is got to rotary drum filter dewater.After the oven dry of product slag, make powder fertilizer, also the product that comes out after the dehydration can be added the granulation on balling disc of water glass additive, cause the particulate state of 3-5mm diameter, drying and packaging.

Claims

1. one kind with inhaling SO ₂The after product slag is made the production method of inorganic composite fertilizer, it is characterized in that steps in sequence is: (1) is abandoned slag with non-ferrous metals smelting works and is clayed into power, add entry then and in the slip tempering tank, be made into slurries, wherein above-mentioned slag powder particle size is at the 100-250 order, slurry water and slag weight ratio 2-20: 1; (2) with pump with slurries squeeze in the absorption tower with tower in sulfur dioxide flue gas react; (3) bottom, the absorption tower product that comes out overflows to circulation groove, for recycle, question response fully after, a part is transported in the precipitate and separate pond; (4) add gypsum in the precipitate and separate pond, gypsum and slag part by weight are 0.02～0.08: 1, after waiting to precipitate clarification, clear liquor is returned slag slip tempering tank recycle for absorbing dioxide flow; (5) throw out is delivered on the filter dewatered; (6) with the oven dry of product slag, make powder fertilizer.

2. production method as claimed in claim 1 is characterized in that delivering to after described throw out is through the filter dehydration pelletizer and adds granulation behind the water glass additive, and drying is made granulated fertilizer again.