Mineral source soil conditioner granulation process and device

Abstract

The invention relates to a mineral source soil conditioner granulation process and device. The granulation process comprises the following steps: (1) raw material proportioning; (2) micro-granulation:forming uniform micro-particles with the moisture content of 10-12% and the particle size of 0.2-0.5 mm through strong mixing granulation; (3) micro-particle storage; (4) disc granulation: forming particles with the moisture content of 11-13% and the particle size of 2-3mm through disc granulation; the granulating device comprises a storage bin, a strong mixing granulator, a micro-particle storage bin, a disc granulator, a drying machine and a vibrating screen which are connected in sequence; and a stirring device and a scraper are arranged in a granulator cylinder of the strong mixing granulator. According to the process, a process of combining strong mixing micro-granulation and disc granulation is adopted, so that the material mixing uniformity is increased, the use ratio of a granulation additive is reduced, the balling rate reaches 85% or above and is improved by 35%, the moisture of disc granules is reduced, single-stage drying is adopted, and the process flow and equipment investment are simplified.

Description

technical field [0001] The invention belongs to the technical field of granulation, and in particular relates to a granulation process and device of a mineral source soil conditioner. Background technique [0002] Silicon-calcium-potassium-magnesium fertilizer is a new type of mineral-sourced soil conditioner that is calcined at high temperature with potassium feldspar, dolomite, limestone and other natural minerals as the main raw materials. Its main nutrients are effective silicon oxide, which can be absorbed by plants, Effective calcium oxide, effective potassium oxide, effective magnesium oxide, etc. [0003] With the extensive use of nitrogen, phosphorus and potassium fertilizers, the imbalance of medium elements (calcium, magnesium, sulfur, silicon) and trace elements (zinc, copper, iron, molybdenum, manganese, boron, etc.) in the soil has become increasingly serious. At the same time, the increasing awareness and popularization of balanced fertilization in the societ...

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Problems solved by technology

[0005] ①The strength of finished granules is low and fluctuates greatly. During the process of drying and sieving, the granules are seriously broken and the pulverization rate is high, which cannot meet the relevant requirements of national standards.

[0006] ② The ball forming rate of disc granulation is low, only reaching 50%, and the cycle load of screening equipment and drying heat load increase

It not only increases the cost, but also leads to a significant reduction in the content of effective elements in the finished product

[0008] ④The automation degree of disc granulation equipment is low, the ball forming effect and water spray volume need to be observed and adjusted manually in real time, the labor cost is high and the labor intensity is high

[0009] ⑤The disc granulation equipment is open type, the dust is large during the granulation process, the production environment is poor, and it cannot meet the environmental protection requirements

[0010] ⑥ The screening effect of the existing wet particle trommel screen is not good, especially in cold areas, and the purpose of screening cannot be achieved

[0011] ⑦ During the granulation process, single-shaft stirring is used for mixing and then disc granulation, the mixing uniformity is poor and the process is relatively complicated

[0012] ⑧Existing powerful mixing and granulation equipment has high installed power and high power consumption, and the material is easy to adhere to the side wall or bottom of the cylinder, without self-cleaning function

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