CN1065221C - Method for producing chloro-free phosphorus potassium fertilizer and coproducing polymerized aluminum iron chloride - Google Patents
Method for producing chloro-free phosphorus potassium fertilizer and coproducing polymerized aluminum iron chloride Download PDFInfo
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- CN1065221C CN1065221C CN96117340A CN96117340A CN1065221C CN 1065221 C CN1065221 C CN 1065221C CN 96117340 A CN96117340 A CN 96117340A CN 96117340 A CN96117340 A CN 96117340A CN 1065221 C CN1065221 C CN 1065221C
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- hydrochloric acid
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Abstract
The present invention discloses a method for producing a phosphorus and potassium fertilizer without chlorine, and joint produced polymeric aluminum iron chloride. Potassium bisulfate obtained from a reaction by adopting an original reaction formula of sulphuric acid and potassium chloride is added with hot water and phosphate rock powder to be agitated and processed through a neutralization reaction at a certain temperature to obtain a phosphorus and potassium fertilizer without chlorine; hydrochloric acid vapor generated in the reaction is absorbed by washing water from the process of producing polymeric aluminum iron chloride to obtain diluted hydrochloric acid, the diluted hydrochloric acid is respectively agitated and soaked with slag containing iron, and calcined coal slack to obtain two solutions, and the two extraction solutions are mixed and agitated to obtain joint produced polymeric aluminum iron chloride. The present invention effectively finds a way out for a large amount of diluted hydrochloric acid as a by-product from the production of a potassium fertilizer without chlorine, and achieves the aims of raising an utilization rate and reducing environmental pollution and production cost.
Description
The invention relates to a method for producing a chlorine-free phosphorus-potassium fertilizer and co-producing polyaluminum ferric chloride by taking potassium chloride as a raw material, belonging to the field of chemical fertilizers and water treatment purificant.
At present, with the rapid development of modern agriculture, the amount of the potassium chloride-free fertilizer used for economic crops is increased day by day, and the natural potash fertilizer in China mainly takes potassium chloride in salt lake regions as the main raw material and cannot meet the requirement of agricultural production, so that a large amount of the potassium chloride-free fertilizer needs to be imported every year in China, the reaction of sulfuric acid and potassium chloride is an important way for preparing the potassium chloride-free fertilizer, and the prior technology for producing the potassium chloride-free fertilizer by taking potassium chloride and sulfuric acid as raw materials mainly adopts the following reaction equation to carry out heating reaction,
the existing production method mainly adopts heating reaction, water in raw materials and hydrochloric acid steam escape together, the concentration of the absorbed generated hydrochloric acid is about the constant boiling point composition, about 20 percent, and the acid concentration is low, so the hydrochloric acid is generally difficult to recycle. If the acid concentration is increased, the recovery rate of the hydrochloric acid is greatly influenced, and the method is neither economical nor seriously pollutes the environment, so that the concentration of the hydrochloric acid which is a byproduct in the production of the potassium sulfate type fertilizer by using sulfuric acid to drive chlorine in the prior art is generally about 20 percent. According to the formula of the chlorine-expelling reaction, 2-3 tons of dilute hydrochloric acid are generated when 1 ton of potassium chloride is used, and if the dilute hydrochloric acid is not utilized, the method not only causes great resource waste and environmental pollution, but also greatly restricts the industrial development of producing the chlorine-free potassium fertilizer by using potassium chloride and sulfuric acid.
The purpose of the invention is: the method for co-producing the polyaluminum ferric chloride by directly utilizing the dilute hydrochloric acid with the concentration of about 20 percent as the raw material while producing the chlorine-free phosphorus potassium fertilizer is provided, so as to achieve the purposes of saving the raw material, reducing the environmental pollution and reducing the production cost.
The invention is formed as follows: it comprises heating sulfuric acid and potassium chloride according to the following reaction formula,
adding 10-30% hot water into the potassium bisulfate containing excessive sulfuric acid obtained by the reaction according to the total weight of the potassium bisulfate, adding phosphate rock powder into the potassium bisulfate according to 50-160% of the total weight of the potassium bisulfate, stirring the mixture, and performing neutralization reaction at the temperature of 80-120 ℃ to obtain the chlorine-free phosphorus-potassium fertilizer; absorbing hydrochloric acid steam generated by the reaction with washing water in the process of producing polyaluminum ferric chloride, generating dilute hydrochloric acid with the concentration of 16-21% through absorption, stirring and soaking the generated dilute hydrochloric acid with iron-containing slag dust and calcined coal gangue respectively to obtain two solutions, separating the two solutions respectively to obtain two leaching solutions and two solid residues, washing the two residues with water, extracting effective components, transferring the two leaching solutions to an absorption process for recycling, mixing the two leaching solutions, adding 0-5% of a polymerization agent according to the total mixed weight of the two leaching solutions, and stirring and reacting to obtain the coproduced polyaluminum ferric chloride.
Compared with the prior art, the method not only makes full use of the dilute hydrochloric acid which is a byproduct in the production of the chlorine-free potash fertilizer, but also can improve the recovery rate of aluminum and iron in the raw materials because a large amount of washing water is adopted to elute residues; the method uses the washing water to absorb the hydrochloric acid generated by the chlorine-expelling reaction to produce the polyaluminum ferric chloride, combines the production processes of the two products into a whole, effectively solves the problem of the export of a large amount of dilute hydrochloric acid as a byproduct in the production of the chlorine-free potash fertilizer, and achieves the purposes of improving the resource utilization rate, reducing the environmental pollution and reducing the production cost.
The embodiment of the invention comprises the following steps: 81 kg of 93 percent sulfuric acid is taken, stirred and heated to 50 ℃ in a reaction kettle, and then 50 kg of potassium chloride (KCl 60%) is slowly added until the reaction is finished (Cl<->is less than or equal to 1.2); adding 20 kg of hot water into potassium hydrogen sulfate containing excessive sulfuric acid obtained by reaction, mixing uniformly, putting the hot slurry into a stirrer, and adding 96 kg of ground phosphate rock (P) while stirring2O5Percent is more than or equal to 30), and the chlorine-free phosphorus-potassium fertilizer is obtained after neutralization reaction at the temperature of 80-120 ℃; absorbing hydrochloric acid steam generated in the reaction by using 90 kg of washing water in the process of producing polyaluminium ferric chloride, generating 110 kg of 20% dilute hydrochloric acid through absorption, and mixing 25 kg of the generated dilute hydrochloric acid with 10 kg of electric furnace smoke dust (containing Fe) of a steel mill2O380 percent) and then using 85 kilograms of generated dilute hydrochloric acid and 35 kilograms of calcined coal gangue powder (containing Al)2O328.3 percent) of the raw materials are soaked and stirred to obtain two solutions, the two solutions are respectively separated to obtain two leaching solutions and two solid residues, the two residues are washed by 90 kilograms of water, and the active ingredients are extracted and then transferred to an absorption process for recycling; mixing the two leaching solutions, adding 2 kg of caustic soda or 2 kg of soda ash as a polymerization agent, and stirring for reactionThen 120 kg of polyaluminum ferric chloride is obtained.
Claims (1)
1. A process for preparing chlorine-free P-K fertilizer and coproducing polyaluminium iron chloride includes such steps as heating reaction between sulfuric acid and potassium chloride,
the method is characterized in that: adding 10-30% hot water into the potassium bisulfate containing excessive sulfuric acid obtained by the reactionaccording to the total weight of the potassium bisulfate, adding phosphate rock powder according to 60-160% of the total weight of the potassium bisulfate, stirring and carrying out neutralization reaction at the temperature of 80-120 ℃ to obtain the chlorine-free phosphorus-potassium fertilizer; absorbing hydrochloric acid steam generated by the reaction with washing water in the process of producing polyaluminum ferric chloride, generating dilute hydrochloric acid with the concentration of 16-21% through absorption, stirring and soaking the generated dilute hydrochloric acid with iron-containing slag dust and calcined coal gangue respectively to obtain two solutions, separating the two solutions respectively to obtain two leaching solutions and two solid residues, washing the two residues with water, extracting effective components, transferring the two leaching solutions to an absorption process for recycling, mixing the two leaching solutions, adding 0-5% of a polymerization agent according to the total mixed weight of the two leaching solutions, and stirring and reacting to obtain the coproduced polyaluminum ferric chloride.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117340A CN1065221C (en) | 1996-12-23 | 1996-12-23 | Method for producing chloro-free phosphorus potassium fertilizer and coproducing polymerized aluminum iron chloride |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96117340A CN1065221C (en) | 1996-12-23 | 1996-12-23 | Method for producing chloro-free phosphorus potassium fertilizer and coproducing polymerized aluminum iron chloride |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1157809A CN1157809A (en) | 1997-08-27 |
| CN1065221C true CN1065221C (en) | 2001-05-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96117340A Expired - Fee Related CN1065221C (en) | 1996-12-23 | 1996-12-23 | Method for producing chloro-free phosphorus potassium fertilizer and coproducing polymerized aluminum iron chloride |
Country Status (1)
| Country | Link |
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| CN (1) | CN1065221C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101525256B (en) * | 2009-04-17 | 2012-07-11 | 中国-阿拉伯化肥有限公司 | Low-chloride phosphorus potassium fertilizer and preparation method thereof |
| CN101618985B (en) * | 2009-08-07 | 2012-07-11 | 中国-阿拉伯化肥有限公司 | System and method for producing chlorine-free phospho potash complex fertilizer using method of low-temperature decomposition by fusion |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076923A (en) * | 1992-03-31 | 1993-10-06 | 丁望 | The production method of mother liquor comprehensive utilization chlorideless potassic fertilizer |
| CN1102166A (en) * | 1993-10-23 | 1995-05-03 | 杨惠森 | Silicon calcium compound polymeric aluminium ferric chloride flocculatant and producing method thereof |
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1996
- 1996-12-23 CN CN96117340A patent/CN1065221C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076923A (en) * | 1992-03-31 | 1993-10-06 | 丁望 | The production method of mother liquor comprehensive utilization chlorideless potassic fertilizer |
| CN1102166A (en) * | 1993-10-23 | 1995-05-03 | 杨惠森 | Silicon calcium compound polymeric aluminium ferric chloride flocculatant and producing method thereof |
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| Publication number | Publication date |
|---|---|
| CN1157809A (en) | 1997-08-27 |
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