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New process for production of potassium sulfate and co-production of compound fertilizer

A production process and technology of potassium hydrogen sulfate, applied in the directions of alkali metal sulfite/sulfite, fertilization device, fertilizer mixture, etc., can solve the problems of low reaction efficiency and large reaction energy consumption, and achieve good water solubility and flexibility. The effect of good performance and low energy consumption

Inactive Publication Date: 2016-01-13
河北新宜化肥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] This method has the disadvantages of large reaction energy consumption and relatively low reaction efficiency, and there is an urgent need for a process that can obtain potassium sulfate with low energy consumption reaction

Method used

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  • New process for production of potassium sulfate and co-production of compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Preparation of Potassium Sulfate

[0045] Such as figure 1 Shown, potassium sulfate production process. 5000kg of potassium chloride and 7200kg of sulfuric acid were placed in the conversion tank and reacted for 1 hour to generate potassium bisulfate and hydrochloric acid, then transferred to the first batching tank, added 7000kg of potassium chloride, mixed evenly, and transported to the neutralization tank. Pass through ammonia gas to neutralize the reaction until pH = 5-6, crystallize for 5 hours, filter, keep the mother liquor for later use, and dry in solid phase to obtain 13000 kg of potassium sulfate.

Embodiment 2

[0047] Combined production of compound fertilizer

[0048] Such as figure 1 Shown, prepare potassium sulfate by the processing method of embodiment 1, the mother liquor obtained by filtering is transferred in the second batching tank simultaneously. Prepare 2000 liters of potassium bisulfate and hydrochloric acid mixed solution with the reaction in the conversion tank, input the second batching tank, adjust the ratio of each component so that the molar ratio of potassium bisulfate, hydrochloric acid and potassium chloride meets the condition of 2:0.5:1 , then the material in the second batching tank is transported to the second neutralization tank, ammonia gas and phosphoric acid are added to the second neutralization tank for neutralization reaction, the amount of ammonia gas is adjusted according to pH, and the amount of phosphoric acid is added The material is controlled in the range of 20%, and when the pH of the solution is 3.5-4, the reaction is complete, transferred t...

Embodiment 3

[0050] co-production of potassium chloride

[0051] Such as figure 1 As shown, potassium sulfate is prepared by the process method of Example 1, and the mother liquor obtained by filtration is transferred to a concentration device, concentrated to 1.2-1.25g / ml, crystallized under stirring conditions for 5 hours, and press-filtered to obtain ammonium chloride product 1000kg. Preferably, the remaining filtrate of press filtration is returned to the potassium chloride dissolving tank for the dissolution of potassium chloride.

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Abstract

The invention discloses a fertilizer production process, which is characterized by including the steps of: (1) reacting potassium chloride with sulfuric acid in a conversion groove to generate potassium bisulfate and hydrochloric acid, then transferring the products into a first dosage bunker, adding potassium chloride and mixing the materials evenly, conveying the mixture into a neutralizing tank, introducing ammonia to carry out neutralization reaction, carrying out crystallization, filtration and solid phase drying to obtain potassium sulfate. The process provided by the invention avoids the high temperature hardening procedure, adopts low energy consumption crystallization technique, is energy saving and environment-friendly. At the same time, the mother solution in production can be directly subjected to concentration filter pressing so as to obtain a ammonium chloride product or be applied to production of special fertilizers, thus realizing the combined production process of a variety of fertilizers.

Description

technical field [0001] The invention relates to a new process for producing compound fertilizer, in particular to a new process for co-producing special compound fertilizer with potassium sulfate. Background technique [0002] Production of potassium sulfate in the prior art mainly adopts the Mannheim process, and is converted into potassium sulfate by Repone K and sulfuric acid reaction, and concrete reaction mode is: [0003] 2KCl+H 2 SO 4 →KHSO 4 +2HCl [0004] It contains two steps: [0005] Step 1: KCl+H 2 SO 4 →KHSO 4 +HCl, Δ<0, exothermic [0006] The second step: KCl+KHSO 4 →K 2 SO 4 +HCl, Δ>0, endothermic [0007] The first step is exothermic and requires lower temperatures, while the second step is a strongly endothermic reaction that requires extensive heating. In the low temperature stage, the generated acidic sulfate is often wrapped on the surface of potassium chloride to form an impermeable membrane, which makes the reaction proceed very slo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/00C05G1/00C01C1/16
Inventor 尹家勇
Owner 河北新宜化肥有限公司
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