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Process for refining primary brine and coproducing slow-release compound fertilizer

A compound fertilizer and brine refining technology, applied in inorganic fertilizers, calcareous fertilizers, fertilizer mixtures, etc., can solve the problems of single fertilizer element, uneven distribution of salt mud components, poor fertilizer efficiency and release performance, etc. The effect of low content, improving the quality of primary brine, and avoiding excessive fertilizer loss

Pending Publication Date: 2021-02-26
CHENGDU HUARONG CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the traditional primary brine refining process does not consider the fertilizer effect of salt mud, the distribution of components in the obtained salt mud is uneven, the content of calcium and magnesium is mostly, the fertilizer element is single, and the fertilizer effect and release performance are poor, so it is not suitable for direct use. use as fertilizer

Method used

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  • Process for refining primary brine and coproducing slow-release compound fertilizer
  • Process for refining primary brine and coproducing slow-release compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Heat the dechlorinated brine solution in the water distribution tank to 60°C, pour it into the chemical salt tank, mix and dissolve it with solid industrial grade potassium chloride raw material, and prepare 300g / L coarse brine.

[0030] (2) The crude brine flows into the crude brine storage tank through the baffle tank, and 30% KOH solution is added into the baffle tank to adjust the pH value to 10.

[0031] (3) the solution with a pH value of 10 in step (2) is squeezed into 300m 3 In the clarifier tank, the flow rate is 30m 3 / s, add 5% H 3 PO 4 solution, adjust the pH value to 9, and generate a solid-liquid mixture.

[0032] (4) Naturally cool and settle the solid-liquid mixture in the clarification tank, the temperature drops to 20 degrees, and the residence time of the solid-liquid mixture in the clarification tank is controlled at 10s.

[0033] (5) The supernatant in the clarification tank is filtered through a Gore filter, and the filtrate is sent to the ...

Embodiment 2

[0037] (1) Heat the dechlorinated brine solution in the water distribution tank to 60°C, pour it into the chemical salt tank, mix and dissolve it with solid industrial grade potassium chloride raw material, and prepare 300g / L coarse brine.

[0038] (2) The crude brine flows into the crude brine storage tank through the baffle tank, and 30% KOH solution is added into the baffle tank to adjust the pH value to 10.

[0039] (3) the solution with a pH value of 10 in step (2) is squeezed into 300m 3 In the clarifier tank, the flow rate is 30m 3 / s, add 5% H 3 PO 4 solution, adjust the pH value to 9, and generate a solid-liquid mixture.

[0040] (4) Naturally cool and settle the solid-liquid mixture in the clarification tank, the temperature drops to 40 degrees, and the residence time of the solid-liquid mixture in the clarification tank is controlled at 10s.

[0041] (5) The supernatant in the clarification tank is filtered through a Gore filter, and the filtrate is sent to the ...

Embodiment 3

[0045] (1) Heat the dechlorinated brine solution in the water distribution tank to 80°C, pour it into the chemical salt tank, mix and dissolve it with solid industrial grade potassium chloride raw material, and prepare 330g / L crude brine.

[0046] (2) The crude brine flows into the crude brine storage tank through the baffle tank, and 48% KOH solution is added into the baffle tank to adjust the pH value to 10.

[0047] (3) the solution with a pH value of 10 in step (2) is squeezed into 300m 3 In the clarifier tank, the flow rate is 30m 3 / s, add 20% H 3 PO 4 solution, adjust the pH value to 9, and generate a solid-liquid mixture.

[0048] (4) Naturally cool and settle the solid-liquid mixture in the clarification tank, the temperature drops to 40 degrees, and the residence time of the solid-liquid mixture in the clarification tank is controlled at 25s.

[0049] (5) The supernatant in the clarification tank is filtered through a Gore filter, and the filtrate is sent to the ...

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Abstract

The invention discloses an efficient and economic process for refining primary brine and coproducing slow-release compound fertilizer, which comprises the following steps: regulating the pH value of crude brine to 10-12, mixing the crude brine with an H3PO4 solution until the pH value is 9-11, and carrying out solid-liquid separation; wherein the solute of the crude brine is industrial potassium chloride. The process disclosed by the invention is simple, the content of calcium and magnesium ions in the primary brine in the ionic membrane potassium-alkali electrolysis process is effectively reduced by optimizing the primary brine refining process, and the slow-release compound fertilizer rich in calcium, magnesium, potassium, silicon and chlorine as a byproduct is obtained.

Description

technical field [0001] The invention belongs to the field of chlor-alkali industry, and in particular relates to a process of refining primary brine to produce slow-release compound fertilizer. Background technique [0002] Potassium hydroxide, chemical formula is KOH, white powder or flaky solid, highly alkaline and corrosive, easily absorbs moisture in the air and deliquesces, absorbs carbon dioxide to form potassium carbonate. Potassium hydroxide can be used to produce potassium salts, soaps, dyes, medicines, desiccants, progesterone, vanillin, cosmetics, etc. It is widely used in agriculture, daily chemicals, pharmaceuticals, dyes, and medicine. [0003] In the current industrial production process of potassium hydroxide, since the potassium chloride raw material contains a large amount of impurities such as soil, calcium, and magnesium, it is necessary to carry out two brine refining processes on the potassium chloride raw material. Among them, the primary brine refini...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/14C05G3/40C05G5/12
CPCC01D3/14C05D1/02C05G3/40C05G5/12C05D3/00C05D5/00C05D9/00
Inventor 陈浩张强冯冬娅
Owner CHENGDU HUARONG CHEM CO LTD
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