Method for preparing organic-inorganic mixed fertilizer from black liquor from KOH and NaOH mixture alkaline pulping for straw

A technology of pulping black liquor and mixed alkali, which is applied in the direction of pulping with inorganic alkali, regeneration of pulping liquid, organic fertilizer, etc., can solve the problems of secondary pollution and high cost, and achieve enhanced fertilizer efficiency and utilization rate , strong fertilizer effect

Inactive Publication Date: 2016-12-07
宁夏同创秸科生物科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the alkaline pulping of straw pulping mainly uses NaOH (caustic soda) for pulping, and the black liquor produced by alkaline cooking and washing is conventionally filtered by a black liquor filter, and then enters the evaporation section of alkali recovery in turn. , combustion section, and causticizing section to recover alk

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0025] The specific implementation of the present invention is as follows:

[0026] 1. Dry preparation, cutting grass and dust removal:

[0027] Use the purchased straw and stack it in the back stock yard for later use. After being air-dried, it is sent to the grass cutter for cutting into 10-30mm long pieces with a moisture content of 10-25%. After being dusted by the dust collector, it is transported by a scraper conveyor to a screw conveyor for pre-soaking, and then manually filled with pots Loaded 40m 3 Steam the ball.

[0028] 2. Intermittent cooking,:

[0029] After the dry preparation process, the rice straw is mixed with the cooking liquid and then passed through the spiral prepreg machine and pot loader, and then put into the steaming ball for cooking.

[0030] 3. Black liquor extraction: the cooked coarse slurry is sprayed to the spraying bin. The bottom of the spraying bin adopts a screw propeller to push the wheat straw pulp to the single screw squeezer. The squeezer squee...

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Abstract

The invention relates to the field of papermaking and fertilizer production, in particular to a method for preparing organic-inorganic mixed fertilizer from black liquor from KOH and NaOH mixture alkaline pulping for straw. The method includes: charging the black liquor from mixed alkaline boiling to an evaporation section, evaporatively concentrating the mixed black liquor into concentrated black liquor, and extracting organics and fertilizer elements such as nitrogen, phosphorus and potassium in the concentrated black liquor to produce the high-activity organic-inorganic mixed fertilizer. The organic-inorganic mixed fertilizer has multiple effects, high efficiency, complete functionality and better nutrition and is more suitable for growing plants; the organics may improve the physical, chemical and biological features of soil, maturate the soil and improve soil fertility and may also provide inorganic nutrients such as nitrogen, phosphorus and potassium.

Description

technical field [0001] The invention belongs to the technical field of papermaking and fertilizer production, and particularly relates to a method for producing active organic-inorganic mixed fertilizer from black liquor after rice straw is mixed with KOH and NaOH for alkaline pulping. Background technique [0002] At present, the alkaline pulping of straw pulping mainly uses NaOH (caustic soda) for pulping, and the black liquor produced by alkaline cooking and washing is conventionally filtered by a black liquor filter, and then enters the evaporation section of alkali recovery in turn. , combustion section, and causticizing section to recover alkali, and the operation cost of the entire alkali recovery is relatively high. At the same time, alkali recovery causes secondary pollution to the environment. [0003] At present, there is no method for producing organic-inorganic mixed fertilizer from the black liquor of KOH (potassium hydroxide) and NaOH mixed alkaline pulping p...

Claims

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Application Information

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IPC IPC(8): D21C11/04D21C3/02D21C3/22D21C11/00C05F7/02C05G3/04C05G3/80
CPCC05F7/02C05G3/80D21C3/02D21C3/222D21C11/0007D21C11/04
Inventor 赵峰徐光川冯福德
Owner 宁夏同创秸科生物科技有限公司
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