Technology for producing medium element fertilizer by using phosphogypsum

A technology of phosphogypsum and elements, which is applied in the field of using phosphogypsum to produce medium-element fertilizers, can solve the problems of unfavorable product solubility and destruction of nutrients, and achieve the effects of reducing ammonia volatilization, improving soil, and strong pertinence

Pending Publication Date: 2018-11-06
宜城市农丰化工有限公司
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Problems solved by technology

When phosphogypsum is used to produce fertilizers, the above methods and existing fertilizer production methods have defe

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  • Technology for producing medium element fertilizer by using phosphogypsum

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Embodiment 1

[0023] A process for producing medium-weight element fertilizers using phosphogypsum, which includes the following steps: firstly pretreat the phosphogypsum, and the pretreated raw materials need to be sampled before being put into use. In order to facilitate granulation and ensure the appearance of the product, it is necessary to It is mixed with soil conditioner in a certain proportion, and becomes granular fertilizer after being crushed and granulated, and then the product is obtained through primary drying, primary cooling, secondary drying, and secondary cooling. Among them, the free water in phosphogypsum after pretreatment The specific gravity is 12% to 15%. The granular fertilizer is heated to 75°C to 85°C during the first drying, and the proportion of free water in the granular fertilizer is reduced to 10% to 13%. After the first cooling, the temperature of the granular fertilizer is reduced to 65°C. During the first drying, the granular fertilizer is heated to 75°C to...

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Abstract

The invention relates to the technical field of a medium element fertilizer, and especially relates to a technology for producing the medium element fertilizer by using phosphogypsum. The technology comprises the following steps: performing phosphogypsum pretreatment, mixing phosphogypsum and a soil conditioner, performing fragmentation and granulation on a mixture to obtain the granular-fertilizer, and performing steps of primary drying, primary cooling, secondary drying, and secondary cooling to obtain a product. The free water proportion in the pre-treated phosphogypsum is 12-15%, the granular-fertilizer is heated to 75-85 DEG C while primary drying, the proportion of the free water in the granular-fertilizer is reduced to 10-13%, the temperature of the granular-fertilizer after primarycooling is reduced to 65 DEG C, the granular-fertilizer after secondary drying is heated to the temperature of 75-80 DEG C, and the proportion of the free water in the granular-fertilizer is reducedto lower than 8%, A granulation step is carried out under normal temperature without addition of water, and is cold condition waterless granulation. The by-product realizes reasonable utilization, theproblem of soil acidifying and salinization in our country can be solved, and the technology perform active effects for reducing crops fertilizer damage and increasing the crops quality.

Description

technical field [0001] The invention relates to the technical field of medium-weight element fertilizers, in particular to a process for producing medium-weight element fertilizers by using phosphogypsum. Background technique [0002] Fertilizer, which can provide one or more nutrients necessary for plants, can improve soil properties and improve soil fertility, is one of the material basis of agricultural production. Calcium, magnesium, sulfur, etc. are essential nutrients for crops. Plants’ requirements for calcium, magnesium, and sulfur are second only to nitrogen, phosphorus, and potassium. Fertilizers supplemented with calcium, magnesium, and sulfur are generally called medium-weight element fertilizers. In addition to providing crop nutrients, medium element fertilizers can also adjust the physical properties of the soil and promote agricultural production. The use of medium element fertilizers has not been paid attention to by people for a long time. The reason is t...

Claims

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Application Information

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IPC IPC(8): C05G3/04C05G3/80
CPCC05D3/02C05G3/80
Inventor 魏泽国
Owner 宜城市农丰化工有限公司
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