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Caustic sludge treatment method

A treatment method and technology for alkali residues, which are applied in the directions of inorganic fertilizers, potash fertilizers, fertilization devices, etc., can solve the problems of environmental pollution caused by the stacking of alkali residues, and achieve the effects of easy operation, low cost of raw materials, and simple process.

Inactive Publication Date: 2015-07-22
薛彦辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the problems existing in the above-mentioned prior art, the present invention proposes a method for preparing potash fertilizer by utilizing alkali residue, which not only solves the environmental pollution problem caused by stacking of alkali residue, but also satisfies the domestic demand for potash fertilizer

Method used

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  • Caustic sludge treatment method

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Embodiment 1

[0047] Step 1: Mix potassium feldspar, alkali slag and salt mud evenly in a weight ratio of 1:1.5:0.2, and pulverize them to 100 mesh in a ball mill;

[0048] Step 2: Put the uniformly mixed potassium feldspar, alkali slag and salt mud into the suspension preheating furnace for roasting, sintering at 1200°C for 1 hour, take it out, add water to dissolve the sintered material and boil for 10 minutes, centrifuge to separate the precipitate Afterwards, the supernatant was concentrated to obtain low-sodium salt, potassium chloride, and calcium chloride respectively;

[0049]Step 3: After the separated residue is treated with acid, the pH of the separated liquid is adjusted so that the pH is 7 to 8, and then separated by pressure filtration in a plate and frame filter press to obtain ferric hydroxide and aluminum hydroxide respectively; insoluble Add 20%-35% sodium hydroxide to the reaction kettle to adjust to strong alkalinity, boil and dissolve, and keep strong alkalinity all the...

Embodiment 2

[0051] Step 1: Mix potassium feldspar, alkali slag and salt mud evenly in a weight ratio of 1:1:0.5, and pulverize them to 100 mesh in a ball mill;

[0052] Step 2: Put the uniformly mixed potassium feldspar, alkali slag and salt mud into the suspension preheating furnace for roasting, sintering at 1000°C for 1.5 hours, take it out, add water to dissolve the sintered material and boil for 30 minutes, centrifuge to separate the precipitate Afterwards, the supernatant was concentrated to obtain low-sodium salt, potassium chloride, and calcium chloride respectively;

[0053] Step 3: After the separated residue is treated with acid, the separated liquid is prepared by adjusting the pH to obtain ferric hydroxide and aluminum hydroxide; the insoluble residue is added to the reaction kettle to adjust the pH to maintain strong alkalinity, and boil to dissolve. And keep strong alkalinity all the time, the mixture obtained after half an hour is centrifuged, the separated precipitate is ...

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Abstract

The invention discloses a caustic sludge treatment method and belongs to the field of chemical industry environment treatment. The problem of environmental pollution caused by caustic sludge stacking is solved. The treatment method comprises the following steps: pretreating a potassium feldspar raw material, drying and roasting, leaching, evaporating to prepare low sodium salt, performing potassium chloride crystallization, performing calcium chloride granulation and treating the caustic sludge and alkali liquor. The potassium feldspar and salty mud are taken as raw materials, the caustic sludge generated in the process of producing sodium carbonate through an ammonia-soda process is treated, the problem of environmental pollution caused by caustic sludge stacking is solved, the domestic quantity demand of potash fertilizers is met, and the caustic sludge treatment method is low in raw material cost, simple in process and easy to operate.

Description

technical field [0001] The invention belongs to the field of chemical environment treatment, and in particular relates to a treatment method for alkali slag. Background technique [0002] Soda slag is the waste residue produced in the process of producing soda ash by the ammonia-soda method. Production practice has proved that 0.3 to 0.5 tons of solid waste slag must be discharged for every ton of soda ash produced. pollute. [0003] At present, alkali slag is mainly used for making cement and engineering soil, in addition to damming and stockpiling. As CN1140151A discloses a kind of method of alkali slag system engineering application, the method for alkali slag system cement tries to change alkali slag into useful product, but implementation is comparatively difficult, and cost is also high; The method of alkali slag system engineering soil adopts stirring method to change The structure of alkali slag is improved, so that it is easy to dehydrate, and it can be used as en...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05D1/04
Inventor 薛彦辉
Owner 薛彦辉
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