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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 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 of producing organic-inorganic mixed fertilizer from the black liquor of KOH (potassium hydroxide) and NaOH mixed alkaline pulping process for rice straw

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

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

[0027] The purchased straw is used and stacked to the return yard for use. After being air-dried, it is sent to the lawn cutter to be cut into 10-30mm long flakes. The flakes have a moisture content of 10-25%. After being dedusted by the dust collector, they are transported to the screw conveyor by a scraper conveyor for pre-soaking, and then filled by hand. 40m 3 steamed balls.

[0028] 2. Batch cooking:

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

[0030] 3. Black liquor extraction: the cooked coarse pulp is sprayed into the spray chamber, and the bottom of the spray chamber uses a screw propeller to push the wheat straw pulp to the single-screw squeezer, which squeezes out the black liquor, and the coarse pulp Dilute with dilute black liq...

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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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